Lada 4x4 Niva Service Manual

TURBONutter
Lada Niva 4x4
Service Manual
Fuel Injection
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ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-1
2. DIAGNOSIS
INTRODUCTION
Diagnosing the electronic fuel injection and engine
management system is fairly straightforward if you use
a sound diagnostic procedure.
The first and foremost order of importance, for diag-
nosing a problem with any type of system, is To under-
stand how that system is supposed to normally operate.
Whether it i$ an automotive system, a heating system for
a building, or even a human biological system like your
heart or lungs, before attempts are made to repair a
problem, it is crucial! to understand what 15 normal and
what is not riormal. |
In other words, to be effective in diagnosing and
repairing problems with the electronic fuel injection and
engine management system, it is important that you pos-
sess a good working knowledge of the system.
Having the proper diagnostic tools and reference
materials available, and attendance at training schools is
a epod method for planning to succeed when diagnosing
problerns or malfunctions wilh the engine management
system.
This manual has a section specifically written to
help in understanding how the system normaliy oper-
ates. The first section of this manual, Section “t", uted
“General Description and System Operation,” 15 2 good
place to begin your understanding of normal system and
component operation. Make sure you Lake the time to
read the material contained at least once.
The Importance of Mechanical Systems
Don't forget, undemeath all me wiring, electronics,
sensors, and actuators is a basic internal combustion
engine. The fuel injection and engine management sys-
tem assumes that al! of the engine's mechanical systems
are functioning properly. As a reminder,' here are a few
“basic engine” items that might cause conditions that
could be blamed incorrecily on the “electronics,” the
engine management system:
Low compression
Vacuum leaks
Exhaust system restrictions
Incorrect valve timing caused by worn parts or
incorrect assembly
Poor quality fuel
Ignored regular maintenance intervals
+ ».
The Importance of Having the
Special Diagnostic Tools
There are certain special diagnostic tools that are
called out in the diagnostic procedures and charts. These
tools are designed for specific diagnostic uses, and the
service manual procedures and charts thar call for their
use are written to require having these tools available. If
thé special diagnostic tools are not used where indicat-
ed, most efforts to accurately diagnose problems with
the engine management system will be extremely diffi-
cult, if. not impossible. These special diagnostic. tools
have been carefully designed and selected, and are
available as a diagnostic tool kit through Kent-Moore
SPX Corporation. ‘Address, FAX, and phone numbers
are supplied | in Section 6 - “Special Tools," of this man-
ual.
As 10 special tools, it is important [6 remember that
none of the special diagnostic tools will make you into a
diagnostic genius. No tool will ever replace human
intellect. Tools can’t perform a diagnosis for you, and
they don’t eliminate the need for diagnostic charts and
- service procedures. All of the special diagnostic | tools
are just that—1ools.
Tools are used to help perform various tasks. Some
tools, such as the Tech 1 diagnostic {ool or the digital
voli-ohm-amp multimeter, aliow us a way lo examine
what is happening in an electrical or electronic circuit.
The Tech 1 diagnostic wol is by itself a small handheld
computer, and communicates with the electronic control
module. The Tech 1 allows us a way of “seeing” what
the electronic control module is interpreting from its
various input signals, and a “window” to observe what
commands are being sent to the vanous devices that are
controlled and operated by the electronic control module.
Knowledge required
It is NOT required that you fully understand how elec-
ronics and computers operate. What is required is a
basic working knowledge of applied electrical theory.
such as voltage, current, resistance, and what happens in
an “open” circuit, and what happens in a “shorted” cir-
cuit. You should also be familiar with interpreting a sim-
ple wiring diagram. Also, you should be familiar with
how to use a digital voit-ohm-amp multimeter in various
situations. OF course, it is assumed that you have a good
understanding of how a basic automotive engine oper-
ales.
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2-2 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
The engine used in this vehicle has controls to
reduce ¢xhaust emissions while maintaining good drive-
ability and fuel economy.
An electronic control module is the heart of this
control system and has sensors used to get information
about engine operation and about the various systems it
controls. Details of basic operation are covered in Sec-
tion “1”, “General Description and System Operation.”
The electronic control module has the ability to do
some diagnosis Of the engine management. When it
finds a problem, it tums “ON” a “CHECK ENGINE"
light on the instrument panel, and a trouble code will be
stored in the electronic control module memory. This
does not mean that the engine should be stopped right
away, but that the cause of the light coming “ON”
| should be checked. as soon as reasonably possible.
“DIAGNOSIS PROCEDURE _
| This portion of Section “2” > Diagnosis” of the
manual ts divided into 5 parts. They are:
INTRODUCT ION. This contains general informa-
tion about how 10 use this section.
“A” SECTION AND “A-_" CHARTS. This is
where all diagnostic procedures. “begin. It contains: the
all-important “DIAGNOSTIC CIRCUIT CHECK";
+ charts.about thé “Check Engine" light; what to do. if the
_ engine. will not run, and other general charts. -
TROUBLE CODE CHARTS. If the DIAGNOSTIC
CIRCUIT CHECK reveals a trouble code set in the elec-
tronic control module's memory, this is where the indi-
vidual trouble codes are diagnosed, If more than one
trouble code is stored, always start with the lowest num-
ber before going to.the next higher trouble code.
“B" SECTION, DRIVEABILITY SYMPTOMS. If
no trouble code is stored, or a code is stored but proves
to be only an intermittent condition, this part will help
the mechanic to find the problem. Again, all diagnostic
procedures must begin with the DIAGNOSTIC CIR-
CUIT CHECK.
“C”" SECTION AND “C-_" CHARTS (Component
Systems). This part contains general remove and replace:
information about the individual components in the
engine control system, It also contains service informa-
tion about those components. This is where you would
look to find information on: the ignition system; intake
manifold electric heater system: the fuel injector; the air
conditioning electrical control system; and so on.
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ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-3
2.1 DIAGNOSTIC PRECAUTIONS |
The following requirements must be observed when working on vehicles:
wth fa 5 D ee
. Before removing any electronic control module system component, disconnect the battery ground cable.
_ Never start the engine without the battery being solidly connected.
. Never separate the battery from the on board electrical system while the engine is running.
. When charging the batiery, disconnect it from the vehicle's electrical system.
. Never subject the electronic control module to temperatures above 80°C, i.e. paint oven. Always remove control
unit first if this température is to be exceeded.
Ensure that all cable hamess plugs are connected solidly and that battery terminals are thoroughly clean.
. The engine management system namess conneciors are designed to fit only one way, there are indexing tabs and
slots on both halves of the connector. Forcing thé connector into place is not necessary if it is installed with the
proper orientation. Failure to maich the indexing tabs and slots on the coanector can cause damage to the connec-
tor, the module, or other vehicle components Or Systems. | :
Never connect or disconnect the electronic control module connectors when the ignition is switched “ON.”
9. Before attempting any electric arc welding on the vehicle, disconnect the battery leads and the electronic control
10.
11.
12.
module connectors.
When steam cleaning engines, do not direct the steam cleaning nozzle at electronic contro! module system com-
ponents. If this happens, corrosion of he teminals can take place.
Use only the test equipment specified in the diagnostic charts; other test equipment may give incorrect results or
damage good components. | . |
Make all voltage measurements using a digital voltmeter with an internal impedance rating of at least 10 million
-. Ohms per volt (10 m£2/voln).
13.
When a test light is specified, a “low-power” test light must be used. Do not use a high-wattage test light (i.e.
Headlight). While a particular brand of test light is not suggested, à simple check on any test light will ensure it 1s
safe for electronic control module circuit testing. Connect an accurate ammeter (such as the high-impedance digi-
tal multimeter) in series with the test light, and power the test light-ammeter circuit with the vehicle battery.
If the ammeter indicates fess than 1/4 amp current flow (.25 A or 250 ma), the test light is SAFE 10 use.
If the ammeter indicates more than 1/4 amp current flow (.25 A or 250 ma), the test hight 1s NOT SAFE to use.
14.
DC AMPS
TESTUGHT BATTERY
Electronic components used in control systems are often designed to carry very low voltage, and are very suscep-
tible to damage from electrostatic discharge. It is possible for less than 100 volts of static electricity to cause dam-
age to some electronic components. By comparison, it takes as much as 4,000 volts for a person to even feel the
zap of a static discharge.
There are several ways for a person to become statically charged. The most common methods of charging are by
friction and by induction. An example of charging by friction is a person sliding across a car seal, in which a
charge of as much as-25;000 volts can build up. Charging by induction occurs when a person with well insulated
shoes stands near a highly charged object and momentarily touches’ ground. Charges. of the same polarity are
drained off, leaving the person highly charged with the opposite polarity. Static charges of either type can cause
damage, therefore, it is important to use care when handling and testing electronic components.
NOTICE: To prevent possible Electrostatic Discharge damage:
« Do Not touch the electronic control module connector pins or soldered components on the electronic control
module circuit board. Never disassemble the electronic engine control module metal case, except for the cali-
brator cover.
+ When handling an engine calibrator, do not remove Lhe integrated circuit from carrier.
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2-4 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
2.2 DIAGNOSTIC GENERAL
DESCRIPTION
The diagnostic charts and functional checks in this
manual are designed to locate a faulty circuit or compo-
nent through logic based on the process of elimination.
The charts assume the vehicle functioned correctly at:
me time of assembly and there are no multiple failures. ...
The electronic control module performs a continual
self-diagnosis on certain control functions. This diag-
nostic capability is aided by the diagnostic procedures in
“is manual. The electronic control module's language
for communicating the source of a malfunction is a sys-
tem of diagnostic codes. The codes are two digit num-
bers that range from 12 to 55. When 2 malfunction is
detected by the electronic control module, a codé is
stored/logged and the “Check Engine” light is tumed
“CN " :
“CHECK ENGINE” LIGHT |
The light is in the instrument pane! and does the fol-
lowing:
« It tells the driver a problem has occurred and the
vehicle should be taken for service as soon as rea-
sonably possible. /r does NOT mean the engine
should be stopped. | |
ож It displays diagnostic “Codes” stored by: the elec-
— .... tronie- controt:módule. which ‚help: the te chniciari
. diagñose system problems: . :
As a bulb and system check, the light will come
“ON” with the ignition “ON,” and the engine not run--
ning. When the engine is started, the light will tum
“OFF.” If the light remains “ON,” the self-diagnostic
system has detected a problem. If the problem goes
away, the light vall tum “OFF” in most cases after 10
seconds, but a diagnostic code will be stored in the elec-
tronic control module's memory,
When the tight remains “ON” while the engine is
running, or when a malfunction ts suspected due to a
driveability or emissions problem, a “Diagnostic Circuit
Check” must be performed. The procedures for these
checks are given in “Diagnostic Charts,” Section
“2.9A". These checks will expose malfunctions which
may not be detected if other diagnostics are performed
out of order.
INTERMITTENT “CHECK ENGINE" LIGHT
in the case of an “intermittent” problem, the “Check
Engine" light will tum “ON” for at least ten (10) sec-
—-onds and then will tum “OFF.” However, thé matching
~ code ‘will be stored in the memory of the electronic con-
tro} module until the battery voitage. to the electronic
control module has been removed or the Tech 1 diagnos-
tic tool has been used to “clear codes.” When unexpect-
¢d codes appear during the code reading process, one
can assume these codes were set by an intermittent mal-
function and could be helpful in diagnosing the system.
An intermittent code may or may not re-set. If it is
an intermittent failure, a Diagnostic Code Chart is not
“used. Consult the “Diagnostic Aids” on the page facing
the diagnostic, chart corresponding to the intermitent
-—diágnostic code. “Symptom Charts,” Section “2.9B”
- “also covers the topic of “Intermicteñts.” A physical
inspection of the sub-system often will reveal the prob-
lem, a
1.1 TERMINAL “8”
DIAGNOSTIC TEST TERMINAL
2 TERMINAL “A” |
GROUND TERMINAL
— Figure 2.2-1 Assembly Line Data Link Location View |
N NS 13194
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ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-5
READING CODES
The provision for communicating with the electron-
ic control module is the assembly line data link connec-
tor (see Figure 2.2-1). The assembly line data link con-
nector is used by the assembly plant to receive electron-
ic control module information, and to check the engine
before the vehicle leaves the plant. The code(s) stored in
the electronic control module's memory can be read
either through. a Tech 1 (а handheld diagnostic 100]
piugged into the assembly line data link connector), or
by counting the number of flashes of the “Check
Engine" light when the diagnostic “test” terminal! “B of
the assembly line data link connector is grounded. The
assembly line data link connector terminal “B” (diag-
nostic “test” terminal) is the second terminal from the
right of the assembly line data link connector’s top Tow.
The terminal is most easily grounded by connecting it to
terminal “A” (connected to engine ground), the terminal
to the right of terminal “B” on the top row of the assem-
bly line data link connector.
Once terminals “A” and “B” have been connected,
the ignition switch must be moved 10 the “ON” position,
with the engine NOT RUNNING. At this point, the
“Check Engine” light should flash Code 12 three times
consecutively. This would be the following flash
sequence: “flash, pause, flash-flash, long pause, flash,
pause, flash-flash, long pause, flash, pause, flash-flash.
Code 12 is not a trouble code, Code 12 merely indicates
that the electronic control module's diagnostic system 15
operating. If Code 12 is NOT indicated, a problem 1s
present within the diagnostic system itself, and should
be addressed by consulting the “Diagnostic Circuit
Check” chart in “Diagnostic Charts,” Section “2.9A”.
Following the flashing of Code 12, the “Check
Engine” light will flash any trouble codes three times if
any diagnostic trouble codes are present, or it will sim-
ply continue to flash Code 12. If more than one diagnos-
tic trouble code has been stored in the electronic control
module's memory, the codes will flash from the lowest
10 the highest, with each code displayed three times.
CLEARING CODES
To clear the codes from the memory of the electronic
control module, either to see if the malfunction will
occur dgain or because repair has been completed, there
are two methods. Either the electronic control module
power feed must be disconnected for at least ten (10)
seconds, or the Tech 1 diagnostic tool also has the abili-
ty to “erase” the diagnostic trouble codes from the elec-
tronic control module's memory without disconnecting
the battery or any fuses. The electronic control module
power feed can be disconnected by removing the nega-
tive battery terminal. (When the battery terminal 1s dis-
connected, other on-board memory data, such as preset
electronic radio tuning, is also lost)
"NOTICE: To prevent electronic control module
“damage, the ighition must be “OFF” when discon-
“necting or réconnécting electronic control module
power. |
DIAGNOSTIC DISPLAY MODE
When the diagnostic “test” terminal is grounded (assem-
bly line data link terminal “В” connected to “A") with
the ignition “ON” and the ENGINE “STOPPED,” the
system will enter what is called the “Diagnostic Dis-
play” mode. (This can also be dorie by using the Tech 1
tool in the “Fl: Field Service” mode, but with the
engine not running.) In this mode. the electronic control
module will: a a |
1. Display a Code 12 by flashing the “Check Engine”
light (indicating the system is operating correctly).
2. Display any stored codes by flashing the “Check
Engine" light. Each code will be flashed three times,
then Code 12 will be flashed again. If no other
codes are in the electronic control modules memo- -
: Ty, Code 12 will continue to flash as long as the
— diagnostic display mode is active. .:
3. Encrgize the intake manifold heater relay, air'condi-
tioning clutch control relay-and evaporative canister
purge solenoid. This allows checking circuits which
may be difficult to energize without driving the
vehicle and being under particular operating condi-
tions. These relays and solenoids will remain ener-
gized as long as the electronic control module 1s in
the “Diagnostic Display” mode, including the intake
manifold electric heater relay, which causes a high
electrical load due to the manifold heater operating
current.
4. Command the idle air control valve to fully extend ‘
to its zero-step position, shunting the idlé air passage
in the role body.
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NiVA
56
“Field Service”
ENGINE RUNNING, the system will enter the °
vice”
1.
| FIELD SERVICE MODE
test” terminal 15 grounded, or
mode is selected from Tech 1 with the
Field Ser-
If the diagnostic *
"mode. In this mode:
The "Check Engine” light will not flash malfunction
codes. It will flash in a different manner, telling the
technician’ if the fuel control system is operating in
the. “Open Loop” or ‘Closed Loop” mode. If i in the
“Closed: Loop” mode, the flashing of the light -will
— indicate if the exhaust iS 100 rich, too lean, or iin
-. Control, The explanátion of each of the 4. possibili-
tes follow.
lA. Flashing “Oper Loop” - The “Check Engine”
light will flash “ON” and “OFF” 2.5 Limes per
second (5 times every 2 seconds).
IB. Flashing “Closed Loop” with fuel system
operating normaliy - The “Check Engine”
light. will flash “ON” and - "OFF" ara rate of
“ ence“per second.
TC] Flashing “Closed Loop” but oxygen señsor
“input indicates a lean exhaust - The “Check
Engine” light will be “OFF” most or all of the
time.
1D. Flashing “Closed Loop” but oxygen sensor
input indicates a rich exhaust - The “Check
Engine” light will be “ON” most or all of the
time.
- The electronic spark: timing, is fixed. ar 10° before
= top dead éenter, when engine revolutions PE: minute ВЕ
- 18] less than. 2,000. To ETS EE a
The idle ‘air control: valve 1 commanded © | a fixed
8 ‘number of steps. Ce |
. ‘Prevent any new diagnostic trouble codes from stor-
ing into memory,
See Sections “1.1” or “2.3” for additional informa-
tion on electronic contol module modes of operation.
2-6 ENGINE MANAGEMENT SYSTEMS 1 AL THROTTLE BODY INJECTION
ELECTRONIC CONTROL MODULE ADAPTIVE
LEARNING ABILITY
The electronic contro! module has a “leaming” abil-
ily which allows it to make corrections for minor varia-
lions in the engine management system to improve
driveability. If the battery is disconnected to clear diag-
nostic codes or for other repair, the “learning” process
resets and begins again. A change may be noted in the
vehicle's performance. To “teach” the vehicle, ensure
that the engine is at operating temperature. The vehicle
should be driven at part throftle, with moderate accelera-
tion and idle conditions until normal performance
retums.
All diagnostic procedures must always begin with
the "DIAGNOSTIC CIRCUIT CHECK."
Diagnostic procedures mus: begin with the ‘“Diag-
nostic Circuit Check,” which represents an organized
approdch for identifying system problems. |
The “DIAGNOSTIC CIRCUIT CHECK” makes an
— initial check of the system, and then: will direct the .
| mechanic to other charts in the book. It must bé used as
a starting point for all procedures. “The entire book is set
up in a specific order, that is, the “DIAGNOSTIC CIR-
CUIT CHECK” will lead the mechanic 10 other charts,
and those charts may lead to still other charts, THE
SEQUENCE MUST BE FOLLOWED. The engine control
system uses many input signals and controls many out-
pur functions. If the correct diagnostic sequence is not .
followed, incorrect. diagnosis and reptacement of good
parts may happen. a
Diagnostic charts‘ incorporate diagnosis: procedures
e à using a Téch 1 “Scan” tool where possible. This Tech 1
“Scan” to6l is. à-smäll hand-held computer in itself. Its
Job 15 to give information to a mechanic about what is
happening in the engine management system.
The assembly line data link connector is used by the
assembly plant lo perform end of line tests. This connec-
tor can also be used by mechanics to monitor certain
inputs and outputs as seen by the electronic control
module. The Tech 1 “Scan” tool reads and displays the
information (serial data) supplied 10 the assembly. line
data link connector from the electronic control module.
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ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-7
DIAGNOSIS PROCEDURE
In response to the “Check Engine” light or an owner
complaint relating to engine performance,
ALL FAULT FINDING SHOULD FOLLOW THE
DIAGNOSIS CHARTS,
BEGINNING WITH THE
DIAGNOSTIC CIRCUIT CHECK!
DIAGNOSTIC CIRCUIT CHECK
— After the visual/physical underhood inspection,
the “Diagnostic Circuit Check” in Section “2.9A” ts
the starting point for all diagnostic procedures or
finding the cause of an emissions test failure.
The correct procedure to diagnose a problem 15 to
follow three basic steps.
1. Are the on-vehicle diagnostics working? This is
determined by. performing the “Diagnostic. Circuit
Check." Since this is the.starting point. for the diag-
nostic procedures or finding the cause of an emis-
sions test failure, always begin here. |
If the on-vehicle diagnostics aren't working, the
“Diagnostic Circuit Check™ will lead to a diagnostic
chart. If the on-vehicle diagnostics are working cor-
rectly, the next step is:
2. Is there a code stored? If a code is stored, go
— directly to the numbered code chart. This will deter-
mine if the fault 1s sull present. If no code is stored,
then: | |
3 Observe Serial Data information transmitted by
the electronic control module. This involves read-
ing the information available on the assembly line
data link/Senal Data Stream with a Tech | “Scan”
tool. Information on this tool and she meaning of the
various displays can be found in the succeeding
paragraphs. Typical data readings under a particular
opgrating condition can be found in: Section
0 29A”, “Diagnostic Charts* - Tech 1 “Scan” Tool
o Typical Data Values. Cl
e
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2-8 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
2.3 TECH 1 “SCAN” TOOL
DESCRIPTION
TECH 1 “SCAN” TOOL
The electronic control module can communicate à
variety of information through assembly line data link
connector termina! “M. This data is transmitted at a
high frequency which requires a Tech 1 “Scan” tool for
interpretation.
TECH 1 “SCAN” TOOL EXPLANATION
To explain how the “Scan” tool works, let's think
for a minute about how a television works. A television
15 an electronic device thar receives and processes infor-
mation. and sends out information in a form that can be
understood by the person watching it. The television
receives a signal (from a transmitting station) that is not
usable 10 the person. The television processes il, then
sends the signal to a screen. The person can then see the
information that the television transmitting station sent
out. The Scan” tool is like the television because it also
processes information, sent to it by the electronic con-
trol module. The information is sent out of the electronic
control module to the assembly line data link connector
terminal “M1”. The “Scar” rool plugs into the assembly
line data link connector, and the information is sent Lo
the tool on its cable. The “Sçan” too! processes the
information, and “sends” the signal 10 a display screen
on Ше tool. Just like a television, you can select which
“station” that you want to see. The difference is instead
of seeing the picture on a television, you “see” the dis-
play screen, and the “stations™ that you can select on
a “Scan” ool are the different input and output signals
that are being processed by the electronic control
module.
TECH 1 “SCAN” TOOL USES
The “Scan” tool is a useful and quick way ol com-
paring operating parameters of a poorly operating
engine with a known good one. For example, a sensor
may shift its value but not set a code. Comparison with a
known good vehicle may uncover this problem.
The “Scan” tool allows a quick check of sensors and
switches which are inputs 10 the electronic control mod-
ule. The electronic control module in the vehicle sends
out information to the “Scan” tool at a very fast raie, and
the display on the tool can update quicker than a digital
volimeter. The “Scan” too! allows a mechanic to manip-
ulate wiring hamesses or components under the hood
while observing the “Scan” readout. This can help in
locating intermittent connections.
TECH 1 “SCAN” TOOL USE WITH
INTERMITTENTS
The Tech 1 “Scan™ tool allows manipulation of
wiring harnesses or components under the hood with the
engine not running, while observing the Tech 1 “Scan”
tool readout. |
The Tech 1 “Scan” tool can be plugged in and
observed while driving the vehicle under the condition
when the “Check Engine” light ums “ON” momentarily
or when the engine driveability is momentarily poor. If
the problem seems to be related to certain parameters
that can be checked on the Tech 1 “Scan” tool, they
should be checked while driving the vehicle. If there
does nol seem to be any connection between the prob-
lem and any specific circuit, the Tech 1 “Scan” tool can
be used to monitor each parameter, watching for a peri-
od of time to see if there is any change in the readings
that indicates intermittent operation.
The Tech 1 “Scan” too] can capture and store data
when the problem occurs, so it can be played back ara
slower rate 10 determine what happened to the system.
This is called the "SNAPSHOT" mode. — |
The Tech 1 “Scan” tool is an easy way to compare
the operating parameters of a poorly operating engine
with those of a known good one. For example, a sensor
may shift in value but not set a diagnostic code. Com-
paring the sensor’s readings with those of a known good
vehicle may uncover the problem. |
The Tech [ “Scan” tool saves time in diagnosis and
helps to prevent the replacement of good parts. The key
to using the Tech 1 “Scan” tool successfully is the tech-
nician’s ability to understand the system being diag-
noscd, as well as understanding the Tech 1 “Scan” tool
operation and limitations. The technician should read
the Tech 1 operating manual to become familiar with the
Tech 1 operation.
ADDITIONAL TECH 1 FUNCTIONS:
“SNAPSHOT”
The Tech 1 tool has the ability to capture and store
data parameters as they occur. This data can then be
replayed and studied to help you locate current and
intermittent problems.
“MISCELLANEOUS TESTS”
The Tech 1 “Scan” tool also has the ability to send
signals to the electronic control module, instructing the
electronic control module to perform various functions
Or lasks,
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
are q
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ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-9
This provides a quick way to determune 1f a device is
operational or not. Also included is à command to erase
all stored diagnostic trouble codes from the electronic
control module's memory. |
Briefly stated, one of the Tech 1 menu selections 1s
called "MISCELLANEOUS TESTS,” After making that
selection, orher menu selections can be chosen. Each
one is descnbed below.
OUTPUT TESTS
« Intake manifold heater relay “ON” and “OFF”
control. Recommend to observe “SYSTEM YOLT-
AGE” while commanding the manifold heater to
cycle “ON” and “OFF.” Sysiem voltage should
decrease slightly when the manifold heater is “ON,”
due to large current draw,
‚+ Air conditioning compressor clutch control relay
“ON” and “OFF” command can be initiated. Listen
for the compressor clutch engagement with the
engine at idle and air conditioning controls in the
“ON” position.
e “Check Engine" lamp “ON” and “OFF” control.
« Evaporative Emissions storage canister solenoid
“ON” and “OFF” control, Recommended 10 operate
engine until fully warm, then observe “CLOSED
LOOP FUEL ADJUSTMENT" as “EVAP SOLE-
NOID" is cycled “ON and “OFF.” Percentage of |
fuel adjustment (XX%) should quickly change as
canisteris purged of fuel vapors.
¡DLE SYSTEM
e Idle control: To exercise the Edic air control motor,
by changing the “desired ¡dle speed” up or down.
The idie air control valve should track this com-
mand, and engine specd should follow up or down if
the idle air control valve is functioning properly.
e ; ide reset: To reset the idle air control valve, Should
cause the idle air control valve to fully extend to the
zero (0) step, fully shut position, then retract Lo a
known position.
OCTANE ADJUST
+ This function instructs the electronic control module
to “read, store, and use” the current value of the
octane adjustment potentiometer input signal. This
adjustment is usually set at the factory to allow
- using high octane fuel. An adjustment wouid be per-
formed if the customer desires (0 use low octane
fuel. When the Tech 1 is not commanding this func-
tion, the octane adjustment input signal from the
potentiometer is only used to determine if the circuit
is good or faulty. Refer to CHART C-15, "Octane
Adjustment,” for further information.
CLEAR CODES
« This function will erase all stored diagnostic trouble
codes from the electronic control module's memory,
without the need to either disconnect the battery of
remove power {rom the electronic control module.
CRANK TEST
This is a special test that monitors and records the
engine cranking speed (revolutions per minute}, bat-
tery voltage while cranking, and could be useful in
diagnosing a “hard start” engine that might be due
to low engine cranking speed.
TECH 1 “SCAN” TOOL LIMITATIONS
The Tech 1 “Scan” tool must receive the signal from
the electronic control module in order to dispiay any
usable information. If the electronic control module
sends no signals (0 the assembly line data link diagnos-
tic connector, or me connection 10 the Tech 1 is defec:
live, the Tech 1 “Scan” tool will only display, ~
DATA, RESELECT OR TURN “OFF” AND eck
ASSEMBLY LINE DATA LINK CONNECTOR.” The
“DIAGNOSTIC CIRCUIT CHECK” instructs the
mechanic what 10 do if this happens.
The Tech! “Scan” tool has a few limitations. H the
Tech 1 “Scan” tool is displaying an electronic control
module “output” function, it displays only the command
given by the electronic control module. That does not
mean that the desired action took place. This is similar
to the dashboard gearshift indicator on a vehicle with an
automatic transmission, Just because the gearshift point-
er indicates the transmission is in “drive” gear does not
mean that the transmission is actually in that gear. To be
sure, you must check the linkage and adjustment at the
transmission. When using the Tech 1 “Scan” tool io
observe one of the electronic control module “output”
functions, such as intake manifold hearer, idle air con-
rol valve, or canister purge, the mechanic must not
assume the indicated is the same as the actual. If the
Tech 1 “Scan” 1001 is displaying manifold heater as
being “ON,” but the manifold heater relay is disconnect-
ed or defective, or if the heater element is burnt out, the
electronic control module has no way of knowing it. The
display may indicate the command Is “ON,” but the
device may not be operating"
VAZ SERVICE MANUAL THROTTLE BODY INJECTION ММА
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60
2-10 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
The Tech 1 “Scan” 1001 saves time in diagnosis and
helps to prevent the replacement of good pans. The key
to using the “Scan” tool successfully for diagnosis is the
technician's ability to understand the system being diag-
nosed, as well as an understanding of the Tech 1 “Scan”
tool's Limitations.
The following information will describe all of the
Tech 1 “Scan” 1001 mode FO data list displays, and how
they help in diagnosis.
With an understanding of the data the Tech 1 “Scan”
tool displays, and knowledge of the circuits involved,
the Tech 1 “Scan” tool is useful in geting information
which is difficult or impossible to get with other
methods.
The Tech 1 “Scan” tool does NOT make using diag-
nostic charts unnecessary, nor can it tell you exactly
where a problem is in a circuit. Most diagnostic charts
incorporate diagnosis procedures thal require the use of
a Tech 1 “Scan” tool.
Figure 2:3-1 Tech 1 “scan” Tool —
DIAGNOSTIC MODES
The electronic control module and the Tech 1 tool
have vanous modes for communicating information
between themselves. The following describes system
operation in the different modes.
DIAGNOSTIC DISPLAY MODE -
1. Ignition “ON.” engine not running.
2, Tech 1 in the “F1: Field Service” mode, but with Lhe
engine not running. (This can also be donc without
the Tech i by using a jumper wire to connect the
assembly line data link connector terminals “ A" and
`В" together.)
When in the diagnostic display mode, these actions
„take place:
e “Check Engine” light flashes codes.
e Cenain soiencids and relays are energized.
e Idle air control valve moves to its fully extended
position. closing the idle air passage in the throttle
body injection unir.
« Diagnostic (rouble codes cannot be stored.
FIELD SERVICE MODE
Similar to “Diagnostic Display" mode, except with
the engine running.
1. Engine running.
2. Tech 1 in the “Fl: Field Service" mode. (This can
also be done without the Tech ! by using a jumper
wirc Lo connect the assembly line data link connec-
LOr terminals “A” and *B” together.)
when in the “Field Service” mode, these actions
take place:
« Electronic spark timing will be fixed at 10° before
.. top dead center when engine revolutions per minute
are less than 2,000. .
"E Idle air control valve will be commanded to à fixed
position,
+ In the “Field Service” mode, the “Check Engine”
light will flash in à different manner. Refer to “Field
Service” mode explanation on Page 2-6 for informa-
tion about how the “Check Engine” light will flash
in this mode.
TECH 1“ FO: DATA LIST" PARAMETERS
-TECH1 “FO: DATA LIST”
When the Tech 1 1001 is connected and the FO dara
list mode 1s selected, the data parameters are displayed
ın pairs.
The Tech 1 has preprogrammed data pairs. If cus-
tom dala pairs are desired, any individual parameter can
be paired with any other parameter. Refer to the Tech 1
owner's manual for further information about selecting
- customized data parameter pairs.
ENGINE SPEED
Displays the electronic contro! moduie's interpreta-
lion of actual engine revolutions per minute, as received
from the crankshaft reference input signal.
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
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ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-11
Often useful to detect if extra reference pulses are sus-
pected. A sudden hgh engine speed indication while at
a steady throttle would indicate electrical interference in
the crankshaft reference input signal circuit. This inter-
ference is usually caused by electronic control module
wires too close to ignition secondary wires or an open
crankshaft reference low Circuit 58 wire.
DESIRED IDLE
While the engine is idling the electronic control
module is controlling idle speed. Desired idie is the
closed throtile engine speed that is commanded by the
electronic control module,
COOLANT TEMPERATURE
. Displays. the electronic contról module's interpreta-
tion of coolant temperature in the engine. The coolant
temperature sensor is mounted in the engine and is
wired 10 the electronic control module. The electronic
control module monitors the difference in voltage
between two terminals, and then converts the voltage to
a temperature shown in degrees Celsius. The reading
should read close to the air temperature when the engine
is cold, and rise as the coolant temperature rises. After
engine is started the temperature should rise steadily to
about B5°C-95°C then stabilize as the thermostat opens.
INTAKE AIR TEMPERATURE
г ‘Displays intake air temperature 2s interpreted by the
electronic control module. The intake air-temperature
sensor is a thermistor and is mounted in the air cleaner.
THROTTLE POSITION
Displays the throttle position sensor signal input to
the electronic control module. Values will be in voltage
from which the electronic control module calculates the
throttle opening. o
~The display is the electronic control module's inter-
pretation of the throttle position sensor input voltage.
With the throttle fully closed the voltage should be with-
in 0.25—1.25 volts and go up to about 4.5 volts at wide
open throttie.
THROTTLE ANGLE
Displays the electronic control module computed
throttle angle as a function of the throttle position sensor
input voltage (see above). 0% refers to a completely
closed throttle while 100% is wide open.
MANIFOLD ABSOLUTE PRESSURE
Displays the electronic control module's interpreta-
tion of the intake manifold absolute pressure. Manifold
absolute pressure sensor output voltage range is from
zero to five volts, but the normal operating range is from
about 0.30 to 4.90 volis. This value on the Tech 1
“Scan” tool cannot change until the engine is started,
even though the actual manifold absolute pressure sen-
sor output voltage can change. With the engine running,
the voltage will be about 1-2 volts ai idle. Âs engine
load increases, this voltage also increases,
BAROMETRIC PRESSURE
This parameter represents calculated barometric air
pressure, based on the signal from the absolute pressure
sensor when the ignition is first switched “ON” before
the engine starts. The electronic control module can
update its baro pressure calculation wher the engine is
operating with the throttle nearly wide open at low
engine speed. Because barometric air pressure depends
on altitude, it may vary from 105 kPa (at or below sea
level) 10 60 kPa (4300 meters above sca level). On the
Tech 1, the calculated barometric pressure is displayed.
OXYGEN SENSOR VOLTAGE
Displays oxygen sensor voltage in millivolts, When
the sensor is cold this voltage will be close to 450 mV.
As the sensor's electric heater begins 10 heat up the oxy-
gen sensor, the voltage will fluctuate between 100-900
mV when the engine is running. If the engine isn’t run-
ning but the ignition is “ON,” the oxygen sensor voltage
will slowly decrease to less than 200 mV.
EXHAUST GASES (RICH/LEAN)
This display will indicate if the electronic control
module is interpreting a “rich” or “lean” exhaust signal
from the oxygen sensor.
OXYGEN SENSOR READY (YES/NO)
“This display will indicate whether or not the oxygen
sensor is in the “ready” state. “Ready” can also be inter-
preted as “up to temperature,”
“OPEN/CLOSED LOOP” FUEL CONTROL
Displays either “Open Loop” or “Closed Loop”
depending on the state of the fuel control system. Time
since start up, oxygen sensor ready status and coolant
temperature all contribute to the change from “Open” to
“Closed Loop.”
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
61
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2-12 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
“CLOSED LOOP” FUEL ADJUSTMENT
This will display corrections made to the fuel injec-
tor pulse width based on the rich/lean indication from
the oxygen sensor signal. As with memory fuel adjust-
ment, the scale will be -99% го + 99%.
MEMORY FUEL ADJUSTMENT
Indicates what “state” the fuel correction is in. 0% is
the middle with no fuel being reduced from or added to
the injector pulse width calculations. If fuel is being
added to the system the display will read between +1%
and +99%. If fuel is being reduced the display will read
between -1% and -99%.
MEMORY FUEL ADJUSTMENT CELL
This display will indicate which memory fuel cell is
currently being used.
AIR FUEL RATIO
The amount of air compared to the amount of fuel in
the air-fuel mixture commanded by the electronic con-
trol module. See “Stoichiometric Ratio” in glossary.
POWER ENRICHMENT MODE ACTIVE?
(YES/NQ)
The display will indicate whether or not the fuel
control system 15 in the power enrichment mode.
DECEL FUEL CUT MODE IN EFFECT? (YES/NO)
Display indicates when decel fuel cut off mode is in
effect.
EVAPORATIVE EMISSION CANISTER PURGE
CYCLE
Displays the pulse width modulation command
(0~100%) of the canister purge solenoid. * a
FUEL INJECTOR PULSE WIDTH
The injector pulse width is the length of time (in
milliseconds) the electronic control module is com-
manding the fuel injector on. Injector “ON” time is how
electronic fuel injection systems control fuel mixture
(air/fuel ratio). A longer “ON” time yields more fuel
delivered, and a richer mixture,
SPARK ADVANCE
Displays the final total spark advance delivered 10
the spark plug.
OCTANE ADJUST
This will display the voltage that the electronic con-
trol module is interpreting from the octane adjust poten-
tiometer. This also displays the value of ignition timing
retard as it relates to the voltage mentioned above,
IDLE AIR CONTROL POSITION (0-255)
Displays the numbers that indicate what position the
electronic control module has commanded the idle air
control valve to be at. The electronic control module
moves the idle air contro! in steps and these steps are
what is displayed on the Tech 1 “Scan” tool. The num-
ber of “steps” or “counts” indicate how far open or shut
the 1dle air passageway in the throttle body is. Larger
numbers mean a larger opening in the idle air passage-
way, and a higher idle speed should occur. After the
engine starts, the numbers should decrease as the engine
warms to normal operating temperature. With the engine
idling in “neutral” and the air conditioning not “ON,”
the numbers should be between 5 and 50 steps. Any-
thing that makes the engine work harder at idle wilt
cause this number to increase. Remember, this position
shows the electronic control module command. There is
no way to verify that the actual idle air control position
is equal to the command.
VEHICLE SPEED
Displays the electronic control module's interpreta-
tion of vehicle speed, as received from the vehicle speed
sensor. If this position indicates no vehicle speed (zero),
but the speedometer shows otherwise, then a Code 24
will eventually set. Also useful in checking speedometer
accuracy.
RADIATOR FAN
This will display “NOT USED" on NIVA vehicles.
INTAKE MANIFOLD HEATER CON/ OFF) |
RELAY |
This will display the (“ON/OFF status of the elec-
tronic control module contro! of this output
SYSTEM VOLTAGE
This will display the voltage of the battery, as inter-
preted by the electronic control module from the termi-
nal which is connected to “Switched + 12V" from the
ignition switch,
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
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ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-13
AIR CONDITIONING REQUEST (YES/NO)
Displays when the operator has requested air condi-
tioning The display is the electronic control module's
interpretation of the air conditioning request input signal
10 the electronic control module. The display will show
“YES” if the electronic control module has 12 volts on
this terminal, indicating that the electronic control mod-
ule has been requested to tum “ON” the air conditioning
compressor clutch. The display will show “NO”: if the
request signal is not received. The signal is a 12 volt sig-
nal from the air conditioning control switches.
Before the signal is received at the electronic con-
trol module, it must pass through the air conditioning
high-side high-pressure switch, and the air conditioning
cycling switch. If the switches are open the Tech 1 will
display “NO” even though the air conditioning request
switch 1s closed.
AIR CONDITIONING (“ON/OFF”) CLUTCH
| The display will show the electronic control mod-
ule's command to the air conditioning compressor con-
trol relay. It will show “ON” if the electronic control
module has commanded the relay to operate the com-
pressor, and “OFF” 1f the electronic control module has
not commanded the relay to operate the compressor.
Remember that the electronic control module command
to the control relay is just that, a command, Do not
assume that the compressor is running just because the
command says “ON,”
FUEL PUMP CIRCUIT (“ON/OFF”)
Indicates whether or not the fuel pump circuit is
energized. This is a valuable display when diagnosing a
suspected fuel pump circuit failure,
CALIBRATION IDENTIFICATION
The programmable read only memory 1s located
inside the electronic control module and has information
on the vehicle's welght, engine transmission, axle ratio
and other items specific to each vehicle. This identifica-
tion is used to determine 1f me engine calibrator 15 the
correct one for a particular vehicle.
TIME FROM START
Time from start is available and is a measure of how
long the engine has been running. If the engine stops,
time from start will reset to 0:00:00.
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
бя
2-14 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
2.4 UNDERHOOD LOCATION VIEW
1.7L THROTTLE BODY INJECTION
L] COMPUTER HARNESS
C1 Electronic Control Module
2 Assambly Line Data Link*
CG Fuse/Relay Block*
C4 Cross Gr Harmess Connector*
CS Fuel Pump to Electronic Control
Module Connector*
C6 Maxi-Fuser
MISCELLANEOUS
1 Fuel Filter
2 Fuel Pressure Tap"
* Actual location may vary,
O CONTROLLED DEVICES
Fuel Injector
Idle Air Control Valve
Fuel Pump Relay"
Ignition System Coils
Check Engine Light
Intake Manifold Heater Relay
Intake Manifold Heater (Under
Throttle Body Injection Unit)
B Fuel Pump {Unger Access Panel in
Storage Area)
9 Evaporative Emission Canister
{mounted inside of the Engine
Compartment near the radiator)
“AA A
ZNANFORMATION SENSORS
A Y e A A
Crankshaft Position Sensor (Front of
Engine, near end of Crankshaft)
Manifold Absolute Pressure Sensor
Coolant Temperature Sensor
Throttle Position Sensor
Octane Adjust Potentiometer
Oxygen Sensor {mounted in Exhaust
Manifold below Throttle Body
Injection Unit)
Intake Air Temperature Sensor
(mounted in Air Cleaner - not shown}
Vehicle Speed Sensor {mounted under
Vehicle to Transmission - not shown)
7-1-92
MS 14519
VÁZ SERVICE MANUAL THROTTLE BODY INJECTION KIVA
WE Es
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ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-15
2.5 FUSEBLOCK VIEWS
COLORS ARE SHOWN ON UNDERSIDE
OF FUSE HOLDER
FUSE IDENTIFICATION CHART
NUMBER COLOR
1. RED
2 BLACK
3 GREEN
4 YELLOW
7-1-92
NS 13183
1 MAXI-FUSE
2 MAXI-FUSE CONNECTOR
3 KICK PANEL
4 DRIVER'S DOOR
NS 13193
1 FUSEBLOCK
2 STEERING WHEEL
3 DRIVER SIDE DOOR
NS 13184
Fuse Block Location View
5 Dyx.eo SAS-21211 aern ai
Maxi-Fuse Location View
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
J
id
2-16 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
2.6 RELAY CALLOUT AND LOCATION VIEW
| | 1 FUEL PUMP RELAY (RED)
2 INTAKE MANIFOLD HEATER RELAY (BLACK)
3 IGNITION RELAY {BLUE}
NS 13185
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
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ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-17
F1
L
ELECTRONIC
CONTROL MODULE
8 RED 81
O BATTERY 7 RED 9 RED C16
7 FUI 1
Fa GRAY/RED
{IGNITION |
h SWITCH 1 INSTRUMENT
mma PANEL
a HARNESS
ENGINE CONNECTOR IGNITION RELAY
BL OUND (blue connector)
76
RED Ea BROWN
# PINK
A INTAKE MANIFOLD HEATER
s0A | FUSE (MAXI-FUSE) ЧР ge
Located near electronic ; ; |
control module O da Sa 15A O
77 RED ENGINE HARNESS Z R Y
+ == = = — — = == - FUSE PAREL under RED BLACK . GREEN YELLOW
TO т instrument panel Ш
INTAKE MANIFOLD | | .
HEATER RELAY | о
„=== 14 PINK/BLACK
i INK/BLACK A Y
A --21BROWN ——dl
1a 15 PINK/BLACK — ————
Y | La 1/P CONNECTOR me]
— A E 13 WHITE —— si I TACHOMETER!
B }— 86 PINK/BELACK
cl — 39 GREEN/WHITE. D4
—9 lo E - — 40 BLACKANHITE = 1 DS
= pl — 58 BLACK/RED —— B3
A
E 68 WHITE CRANKSHAFT
— SENSOR
COL с 67 BROWN
ASSEMBLIES
DIRECT IGNITION
SYSTEM MODULE
ENGINE GROUND Г 53 BROWN — AH
Attaches to engine at 52 re
ignition module bracket lijo BROWN 4-54 BROWN a
BATTERY
BATTERY
IGNITION SWITCH VOLTAGE
INPUT SIGNAL
ELECTRONIC SPARK
TIMING OUTPUT
BYPASS MODE CONTROL
REFERENCE INPUT SIGNAL
REFERENCE LOW
ELECTRONIC CONTROL
MODULE GROUND
10-22-92
NS 14422
Engine Management System Wiring Diagram 1.71 Throttle Body Injection NIVA (1 of 5)
VAZ SERVICE MANUAL THROTTLE 80DY INJECTION ММА
2-18 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
ASSEMBLY LINE
DATA UNK
| INSTRUMENT PANEL |
FUEL GAGE I
— on
GREEN...
и на. ня рн Е ЧН
ELECTRONIC
CONTROL MODULE
DIAGNOSTIC TEST TERMINAL
57 BLACK/WHITE
— —— $1 BROWN
| в | A 77357"
| VEHI
LS 1 | oF 54 BROWN——{ D1
52
BROWN
ENGINE GROUND
_ Attaches to engine at
ignition module bracket
62
FUSEZ @ 15A
(RED)
46
PINK/BLACK
FUEL SYSTEM RELAY
fred connector)
A9 E INPUT SIGNAL
53 BROWN— [AT E ELECTRONIC CONTROL
MODULE GROUND
YELLOW
|
L RELAY
78
PINK/BLACK
12
PINK/ELACK
— ENGINE GROUND
Attaches to engine at
ignition module bracket
IN-TANK
ELECTRIC
FUEL PUMP
and
FUEL LEVEL
SENDER
FUEL
INJECTOR
Ag | SERIAL DATA
COMMUNICATIONS
ex FUEL SYSTEM RELAY
63 GREEN/WHITE———{ AT} CONTROL |
ı MODULE ı
= —
1100
+. TOXYGEN!
Co
| | SENSOR 3
INJECTOR
CONTROL
64 BLUE
22 BLACK
C 22 BLACK
INJECTOR CIRCUIT
CURRENT LIMITER
= 4-20-93
№ 14405
Engine Management System Wiring Diagram 1.7L Throttle Body Injection NIVA (2 of 5)
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
ET
3
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-19
$2 BROWN
a TO
N CANISTER PURGE
| SOLENOID
FUSE
(BLACK) BLACK
25 PINK/BLACK
37 BROWN
‘2 OF 51
19 BROWN
ENGINE GROUND
Attaches to engine at
ignition module bracket
ENGINE COOLANT
TEMPERATURE SENSOR |
I 20 BROWN
—— ue —— EE Пин = к
1 l TO 1
EIMANIFOLO HEATER 1
1 1
AL RELAY 3
R 15 А 26 PINK/
82 PINK/
BLACK
Ue
29 PINK/BLACK
27 PINK/BLACK
VEHICLE SPEED
Hall 1
SWITCH il
CIRCUIT SENSOR
|
Lids
BLACK | VIOLET
| PINK | TAN
1
BLACK BLUE BROWN
ELECTRONIC
CONTROL MODULE
Y? la
CC в GREEN—— А10 |
VEHICLE SPEED SENSOR
INFUT SIGNAL
32 PINK D7
OXYGEN SENSOR
INPUT SIGNAL
OXYGEN SENSOR
GROUND
Do 33 BROWNAVHITE ==-— De
ELECTRICALLY HEATED
EXHAUST GAS
OXYGEN SENSOR
31 YELLO d C10
| COOLANT TEMPÉRATURE
INPUT SIGNAL
COOLANT TEMPERATURE
OLE 812: то 72 PINK/BLACK ==—=— AT
THROTTLE POSITION | | PINK/BLACK | =
SENSOR 1 с 36 BLUE
1
! A 35 GRAY 75 GRAY cu
100%
66
GRAY
MANIFOLD ABSOLUTE a
PRESSURE SENSOR 43 GREEN Jen
— 61 BLACK 69 BLACK ———[D2]
INTAKE AIR |
TEMPERATURE SENSOR a TY
65 WHITE [ez
: WM 812
ro 59 GREE [812
3 | 2 | | 1
OCTANE » E.
ADJUSTMENT „” ..
POTENTIOMETER ”
AND THROTTLE POSITION
SENSOR GROUND
THROTTLE POSITION
INPUT SIGNAL
+5 VOLTS REFERENCE
OUTPUT
MANIFOLD PRESSURE
INPUT SIGNAL
MANIFOLD PRESSURE,
INTAKE AIR TEMPERATURE,
AND OCTANE ADJUSTMENT
SENSOR GRGUND
INTAKE AIR TEMPERATURE
INPUT SIGNAL
| OCTANE ADJUSTMENT
POTENTIOMETER
INPUT SIGNAL
9-15-92
NS 15203
Engine Management System Wiring Diagram 1.71 Throttle Body Injection NIVA (3 of 5)
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
2-20 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
ELECTRONIC
CHECK ENGINE CONTROL MODULE
LIGHT | |
VAZ
FUSE (0) | |
E CHECK ENGINE LIGHT
К 38 BLACK/WHITE CHECK EN
INSTRUMENT PANEL HARNESS
+ TO -
ENGINE HARNESS CONNECTOR
{8 terminal, white color)
27 TT 1
PINK/BLACK CL OXYGEN SENSOR !
EVAPORATIVE EMISSIONS
STORAGE CANISTER
PURGE SOLENOID
E Г; PULSE WIDTH MODULATED
PINK/BLACK PINK/BLACK Og 41 GREEN/YELLOW Ta] | CANISTER CONTROL
ruse R
(BLACK)
ro то 1
PINK/BLACK I VEHICLE SPEED SENSOR |
82 PINK/
K
Da BLAC
» 77 RED | |
MAXIFUSE 5 | 4
| , INTAKE MANIFOLD
ER HEATER RELAY
(black connector)
2 6
INTAKE MANIFOLD ELECTRIC
81 PINK/BLACK HEATER RELAY CONTROL
INTAKE MANIFOLD 1
ELECTRIC HEATER BLACK
47 BLUE/WHITE <5 1 COIL "A- HIGH
48% BLUE/BLACK cs E COI “A” LOW
49 GREEN/WHITE ca E CON “8” HIGH
50 GREEN/BLACK = — ca À com 78” Low
IDLE AIR
CONTROL
VALVE
9.15.92
NS 15204
Engine Management System Wiring Diagram 1.7L Throttle Body Injection (4 of 5)
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA,
=.
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-21
= I ELECTRONIC
6
VAZ VAZ t ENGINE CONTROL MODULE
FUSE AIR CONDITIONING © HARNESS _
HARNESS ;
7 AIR !
CONDITIONING
]
1
zn IGNITION SWITCH
a
COMPRESSOR |
. AIR CONDITIONING !
MAIN RELAY | |
1
1
t
i
— = I
1
1
i
1
1
E I
5 1.
3 rime не . AIR CONDITIONING
— : 11 0" - . RELAY CO
| | | “ BLOWER SPEED j | | comeresson .. Ph в a . |
a | I as CONTROL RELAY 1
НЫ © 1
Y I 1 AIR q
q | COOLING | CONDITIONING !
CONTROL {
Al TA AlR CONDITIONING
— | SWITCH < d—8 GREEN mame] 85 REQUEST
! ы НЫ INPUT SIGNAL
1 P | i
OFF MAX I
au. i
2 !
+ __ = PC. Ti
HILO REFRIGERANT - - :HI COOLANT
PRESSURE SWITCH TEMPERATURE L
o SWITCH t
; E
1
Î
> I
2 i
1
VAZ ' ENGINE
VAL AIR ' HARNESS
г FUSE CONDITIONING I
i HARNESS I
5 CONDENSER :
FAN | |
F ;
E | ;
CONDENSER FAN RELAY :
- PIE
$ à
i I
1
I
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a E
i
CONDENSER I
FAN '
i
m 1 3-27-92
E | Co NS 15205
Engine Management System Wiring Diagram 1.7L Throttle Body infection NIVA (5 of 5)
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIV A
2-22 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
2.7 ELECTRONIC CONTROL MODULE CONNECTOR IDENTIFICATION CHARTS
TBI ELECTRONIC CONTROL MODULE CONNECTOR IDENTIFICATION
This electronic control module voltage chart is for use with a digital voltmeter to further aid in diag-
nosis. The voltages you get may vary due to low battery charge or other reasons, but they shouid be
very close.
THE FOLLOWING CONDITIONS MUST BE MET BEFORE TESTING
e Engine at operating temperature @ Engine idling (For “Engine Run” column)
e Diagnostic “test” terminai not grounded *e Tech 1 “Scan” tool not installed
# Air conditioning “OFF”
# Digital voltmeter “—" (negative) lead connected to a good clean ground point.
Si
. " r
fi ..
TRE,
DC VOLTAGE 24-PIN A-B CONNECTOR
IGN ENG. WIRE |
TON” RUN CIRCUIT PIN COLOR ' !
| 6 Be FUEL SYSTEM RELAY PE GREEN/
= CONTROL | WHITE
NO CONNECTION | az | "E E
В+ VARIES PULSE WIDTH MODULATED "{ = A2 “| “ÉREEN/
—6 | CANISTER CONTROL YELLOW BACK VIEW OF CONNECTOR
NO CONNECTION Ad E . +.
1 Battery voltage for first two
0 8+ Eo CINE LIGHT AS BLACKS seconds, after ignition is -
B B IGNITION SWITCH VOLTAGE 6 P turned “ON without crank-
+ + A INKS I I
INPUT SIGNAL BLACK 5 Wh the hide à + J
en vehicle is stopped,
NG CONNECTION A7
= — RAT DATA = == voltage will be either less
- - ANGE than 1 volt or more than 10
VARYIN i - -
G any NG COMMUNICATIONS volts; depending upon posi-
DIAGNOSTIC "TEST АЗ BLACK/ tion of drive wheeis. When
TERMINAL INPUT SIGNAL WHITE vehicle is moving, voltage
2 | VARIES VARIES | VEHICLE SPEED INPUT SIGNAL AD GREEN will vary depending upon:
ne 0 COOLANT TEMPERATURE AL PINK/ vehicle speed. |
SENSOR £ THROTTLE .
oer gee ELECTRONIC CONTROL A12 | BROWN 4 Varies. With ignition “ON,”
MODULE GROUND reads barometric pressure.
With engine running, reads
engine load.
DC VOLTAGE 5 Voltage will vary with engine
revolutions per minute.
[ON ENG. WIRE - -
“ON” RUN CIRCUIT PIN | COLOR 6 Depending on octane adjust:
Be Be SATTERY + (POWER SUPPLY) B1 RED ; atra Ро о пасе (E М oh
attery voltage (B +) wi
NO CONNECTION , |
— - | 82 engine warm. Less than 0.5
9 0 CRANKSHAFT REFERENCE B3 rr volts on cold engine, |
NO CONNECTION Es = 8 Varies between battery volt-
> age down to less than 1 volt,
O ocean EFERENCE | № TAME | dépending on 0%-100% duty
cycie of pulse width modulat-
NO CONNECTION 85 ed control signal.
NO CONNECTION В’ * Less than 0.50 volt.
“OFF” O Û* AIR IONI
“out on INPUT CNA ING REQUEST se GREEN ** Less than 0,10 volt.
NO CONNECTION 83 B+ Should equal battery voltage
NO CONNECTION E10
NG CONNECTION B11 ENGINE 1.7L Throttle Body
(6) | 1-5 VOLT | 1-5 VOLT | OCTANE ADJUSTMENT B12 GREEN Injection/NIVA
INPUT SIGNAL |
10-1-92
NS 14227
Figure 2.7-1 ECM Connector Terminal End View 1.7L Throttle Body Injection NIVA (1 of 2)
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
a
ery
мт,
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-23
®
DC VOLTAGE
IGN ENG. В WIRE
“ON” RUN CIRCUIT. . FIN COLOR
“NO CONNECTION | en |
B+ B+ INTAKE MANIFOLD ELECTRIC * ©2 © PINKY
HEATER RELAY CONTROL BLACK
MOT USEABLE | (DLE AJR CONTROL COM "BB" C3 GREEN
LOW BLACK
NOT USEABLE | ¿DLE AIR CONTROL CO!L *B- ca GREEN/
HIGH WHITE
NOT USEABLE IDLE AIR CONTROL COIL “A* cs BLUE/
LOW BLACK
NOT USEABLE | (DLE AiR CONTROL COIL “A” C6 BLUES
HIGH WHITE
NO CONNECTION C7
NO CONNECTION ca
NO CONNECTION ca
1-2 1-2 COOLANT TEMPERATURE cio YELLOW
INPUT SIGNAL
35-50 0.9-1.5 MANIFOLD ABSOLUTE C11 GREEN
PRESSURE INPUT SIGNAL
INTAKE AIR TEMPERATURE C12 WHITE
INPUT SIGNAL
3-.7 3-7 THROTTLE POSITION INPUT C1 BLUE
SIGNAL .
5 5 +5 VOLY REFERENCE OUTPUT C14 GRAY
o NO CONNECTION C15
| В+ Be BAYTERY + C16 RED
DCVOLTAGE. |
“ |; лем” | ENG. | WIRE
“ON” - RUN CIRCUIT PIN COLOR
(== 0 ELECTRONIC CONTROL D1 BROWN
MODULE GROUND
0** gr: . OCTANE ADJUST 02 BLACK
POTENTIOMETER, MANIFOLD
ABSOLUTE PRESSURE SENSOR,
AND INTAKE AIR TEMPERATURE
SENSOR GROUND
| NO CONNECTION “- D3 o
0* 12 ELECTRONIC SPARK TIMING Da GREEN?
| OUTPUT + a WHITE -
“0 467. | 1GNITION MODULE BYPASS DS | BLACKS -
co - MODE CONTROL WHITE
0** O OXYGEN SENSOR GROUND DE BROWN
0.1-0.2 VARIES OXYGEN SENSOR INPUT SIGNAL 07 PINK
NO CONNECTION ba
q o INJECTOR CIRCUIT CURRENT Da BLACK
LIMITER JUMPER
Qee 0** INJECTOR CIRCUIT CURRENT Dig BLACK
LIMITER JUMPER
NO CONNECTION D11
6 B+ A/C | AIR CONDITIONING D12 BLUE
"OFF”, COMPRESSOR CLUTCH RELAY :
0" A/C CONTROL
“ON”
к MO CONNECTION - D13
NO CONNECTION D14
NO CONNECTION D15
8+ B+ INJECTOR CONTROL D16 BLUE
01
Li
*
32-PIN C-D CONNECTOR
rif <r quiro
UOC JUN uu
10000
I
- À
E
BACK VIEW OF CONNECTOR
Battery voltage for first two
seconds, after ignition is
turned “ON” without crank-
ing the engine.
When vehicle is stopped, volt-
age will be either less than 1
volt or more than 10 volts;
depending upon position of
drive wheels. When vehicle is
moving, voltage will vary
. depending upon vehicle
speed.
Varies with temperature.
Varies. With ignition YON,”
reads barometric pressure.
With engine running, reads
engine load.
Voltage will vary with engine
revolutions per minute.
Depending on octane adjust
ment potentiometer тп,
: Battery voltage (8 + ) with
engine warm. Less than 0.5
volts on cold engine.
: ‘Varies between battery voit-
- age down to less than 1 volt,
depending on 0%-100% duty
cycle of pulse width modulat-
ed contro! signal.
Less than 0.50 volt.
** Less than 0.10 volt.
B + Should equal battery voltage
ENGINE 1.7L Throttle Body _
Inject
10-1-92
NS 14328
Figure 2.7-2 ECM Connector Terminal End View 1.71 Throttle Body Injection NIVA (2 of 2)
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
2-24 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
2.8 ELECTRONIC CONTROL MODULE TERMINALS DEFINED
ELECTRONIC CONTROL MODULE
CONNECTOR VOLTAGES WITH EXPLANATIONS
A1
AZ
A3
Ad
А5
Аб
А7
FUEL SYSTEM RELAY CONTROL - Tuming
the ignition “ON” signals the electronic control
module to energize (+12V) the fuel system relay.
If no crankshaft reference input pulses are
received, the electronic control module turns
“OFF” the relay, When the electronic control
module receives crankshaft reference input (ter-
minal “B5”) the electronic control module tums
the fuel pump relay back “ON.”
NO CONNECTION
PULSE WIDTH MODULATED CANISTER
CONTROL - The electronic control module sup-
plies the ground circuit 10 energize the evapora-
tive emission storage canister control solenoid.
With the engine stopped this terminals should
equal the battery voltage. With the engine run-
ning, the voltage will be between battery voltage
and zero. The voltage level will depend on the
0%—100% pulse width modulated control signal
sent to the canister solencid.,
NO CONNECTION
CHECK ENGINE LIGHT CONTROL - The
electronic control module supplies the ground 10
tum the “Check Engine” light “ON”. With the
ignition “ON” and the engine not running, the-
“Check Engine" light should be “ON,” terminal
“AS” voltage is close to zero. With he “Check
Engine” light nor “ON,” the voltage at terminal
“AS” is battery voltage.
IGNITION SWITCH VOLTAGE INPUT SiG-
NAL - This is the “turn on” signal 10 the elec-
tronic control module from the ignition switch
circuit. It is not the “power supply” 10 the elec-
tronic control module; if signals the electronic
control module the ignition is “ON.” The voltage
equals battery voltage when the ignition switch is
in either the ‘run’ or ‘crank’ position.
NO CONNECTION
AS
Ag
A10
A11
A12
SERIAL DATA COMMUNICATIONS -
From terminal “A8” the electronic control mod-
uie sends oul information (data) about its inputs
and outputs to the assembly line data link temi-
nal “M. This data is sent as a string of rapidly
changing voltage signals puised from high (+5
volts) to low (O0 volts). The Tech 1 “Séan” tool,
when connected, interprets the varying square-
wave signal and displays the data. The data is
sent in a serial fashion; that is, one piece after the
Other until :il the information has been sent—
then the process begins again. Voltage, when
measured with a digital voltmeter, will rapidly
change between 1 and 5 volts.
DIAGNOSTIC “TEST” TERMINAL INPUT SIG-
NAL - This terminal is connected to te assembly
line dara link diagnostic “test” terminal “B”.
When the diagnostic “test” rerminal is not
grounded, mis terminal will have 5 volts on it.
When the assembly line data link diagnostic
“rest” terminal is grounded, the resulting zero
voltage at the electronic control module causes it
LO operate in the Diagnostic Mode or the Field
Service Mode, depending if the engine is stopped
Or running.
VEHICLE SPEED. INPUT SIGNAL - The elec-
tronic control module sends a +12V signal volt-
age to the vehicle speed sensor. The vehicle
speed sensor pulses the signal to ground, these
pulses vary in frequency with the speed of the
car,
COOLANT TEMPERATURE AND THROTTLE
POSITION SENSOR GROUND - This terminal
should be nearly zero volts. It is connected
through the electronic control module circuitry 10
engine ground.
ELECTRONIC CONTROL MODULE GROUND
- This terminal has nearly zero volts. It is con-
nected directly lo the engine at the direct ignition
system mounung bracket.
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
Ln
A ey
e
B1
B2
B3
ВА
в5
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-25
BATTERY + (Power Supply) - This terminal
“B1” suppiies the electronic control module with
full-time +12 volts. It is hot even when the igni-
tion is tumed “OFF.” It receives voltage through
the fusible link. This electronic control module
terminal could be called the power supply and
“MEMORY” terminal, along with terminal
“CI16”.
NO CONNECTION
CRANKSHAFT REFERENCE LOW - This
terminal is always nearly zero volts. It is connect-
ed through the ignition module to engine ground.
NO CONNECTION
CRANKSHAFT REFERENCE INPUT S$IG-
- NAL - This terminal could be called the “tach”
- input. It provides the electronic control module
‘B6
87
BS.
B9
with revolutions per minute and crankshaft posi-
tion information. With ignition “ON,” bul the
engine not running, the volrage is less than i volt.
As the crankshaft turns, the voltage increases
with revolutions per minute.
NO CONNECTION
NO CONNECTION
AIR CONDITIONING REQUEST INPUT
SIGNAL - When the instrument panel air condi-
tioning switch is “OFF,” the voltage at this termi-
— nal is near zero. When the switch is “ON,” a +12
volt signal is sent to the electronic control module.
- NO CONNECTION
810 NO CONNECTION
B11 NO CONNECTION
B12
C1
C2
OCTANE ADJUSTMENT INPUT SIGNAL -
The octane adjust potentiometer output voltage,
which depends on the potentiometer voltage
adjustment, is variable from 1-5 volts. By moni-
toring this output voltage, the electronic contro!
module makes small changes in the 10tal spark
advance to allow for low octane fuel,
NO CONNECTION
INTAKE MANIFOLD ELECTRIC HEATER
RELAY CONTROL - This termina! has battery
voltage until the electronic control module ener-
gizes the relay by supplying the ground, then the
voltage is close to zero, The input that causes the
electronic control module to energize the relay is
C10 - COQLANT TEMPERATURE SENSOR.
The electronic control module also energizes the
relay in the Diagnostic Mode - ignition “ON,” the
engine not. running with the assembly line data
“link diagnostic “test” terminal “B” jumpered to
“A
C3, C4, C5, C6
ce
C10
IDLE AIR CONTROL COILS - These termi-
nals are connected to the idle air control valve,
located on the throttle body. It is difficult to pre-
dict what the voltage wili be, and the measure-
ment is not usable for service procedures.
NO CONNECTION
NO CONNECTION
NO CONNECTION
COOLANT TEMPERATURE INPUT SIG-
NAL - The electronic control module sends a
5 volt signal to the coolant temperature sensor—a
temperature-variable-resistor, called a thermistor.
The sensor, also connected 10 ground, varies the
voltage based on engine coolant temperature. ÁS
the engine coolant temperature increases, the
voltage on terminal “C10” decreases. Al 0°C
engine coolant temperature, the voltage is above
4 volts. AL normal operating temperature (85°C
to 100°C) the voltage is less than 2 volts.
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
171
2-26 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
en
MANIFOLD ABSOLUTE PRESSURE
INPUT SIGNAL - The voltage on terminal
“Са” varies with intake manifold: ‘pressure. The
sensor monitors intake manifold pressure by a
small hose connected to the sensor from the [hrot-
te body. With the igniton “ON” and the engine
not running (high manifold pressure) the voltage
is above 4 volts. This 1s the baromeinc pressure
measurement, and this voltage changes with both
barometric pressure and altitude. When the
engine is running at idle, the manifold pressure is
quite low due to engine vacuum; therefore, the
. voltage is also low -1 to: 2 volts. The voltage is
variable, mostly from engine intake manifold
- pressure changes, but it can change wilh baromet-
-- Tic pressure or altitude changes. This is typically
C12
C13
C14
“called the “engine load” input.
INTAKE AIR TEMPERATURE INPUT SIG-
NAL - The electronic control module sends a
5 volt signal to the air temperature sensor—a
temperature-vanable-resisior, called a thermistor.
The sensor, also connected to ground, vanes (he
voltage based on intake air temperature. As the
intake air temperature increases, the voltage ón
terminal “C12” décreases. AUÓ*C intake air tem-
perature, the voltage is dbove 4 volts. At normal
Operating temperature (85°C 10 100°C) the voli-
age 15 less than 2 vols.
THROTTLE POSITION INPUT SIGNAL -
The throttle position sensor input voltage, which
follows actual throttle changes, is variable From O...
10 5 volts. Typically the voltage 15 less than'1 volt |
at idle, and 4 10 5 volts at widc-open throttle.
+ 5 VOLTS REFERENCE - This vollage is
always nearly 5 volts with ihe ignítion “ON.” It is
à-regulated voltage output from the electronic
control module, and sunplies 5 votts 10 the mani-
fold absolute pressure and throttle position sen-
sors.
C15. NO CONNECTION |
D1
D2
D4
D5
D6
ci BATTERY + (POWER SUPPLY) - See t>rmi-
nal “BI”. -
ELECTRONIC CONTROL MODULE
GROUND - This terminal has nearly zero volts,
Iris connected directly to the engine at the direct
ignition system mounting bracket.
OCTANE ADJUST, MANIFOLD ABSOL-
UTE PRESSURE, AND INTAKE AIR TEM-
PERATURE SENSOR ‘GROUND - This ter:
‘minal is nearly zero volts, it is connected through
the electronic control module to engine ground.
ELECTRONIC SPARK TIMING QUTPUT -
This terminal has very low voltage with the igni-
tion “ON,” but the engine not running. With the
engine running at idle, the voltage is slightly
more than 1 volt. As the engine revolutions per
minute Boes up, this voltage | increases.
IGNITION MODULE BYPASS | MODE -
- CONTROL - With ignition “ON” and the engine .
not running this terminal has very low voltage.
When the electronic control module measures
more than 500 revolutions per minute (engine
“RUN™ threshold) on BS - CRANKSHAFT REF-
ERENCE INPUT SIGNAL, the electronic control
module turns on 5 volts to D5 - IGNITION
“+ MODULE BYPASS MODE CONTROL CIR:
EN eur. = 1
ÖXYGEN SENSOR GROUND: CIRCUIT .
This terminal should have zero volts. It is con-
nected directly to the engine block at the ignition
module bracket. This terminal grounds the elec-
ironic control module circuitry for the oxygen
sensor voltage monitor inside the electronic con-
trol module.
VAZ SERVICE MANUAL THROTTLE BQDY INJECTION ММА
„ео — — = —
gar ел
2 TOP
ea
E
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-27
D7 OXYGEN SENSOR INPUT SIGNAL- With
1gnition “ON” and engine not running, the volt-
age should drop from a starting point of approxi-
mately 0.450 volt to less than 0.200 volts. The
oxygen sensor is electrically heated. When the
engine Is not running and the sensor is hot an
abundance of oxygen in the exhaust manifold
will be sensed and the sensor's output voltage
would be less than 0.200 volts, If the sensor's
electric hearer is malfunctioning, the only voltage
seen here with the engine stopped would be the
“reference” voltage coming from the electronic
control module. This reference voltage is a steady
400-500 mV (0.400-0.500 volt). With the engine
running and after the oxygen sensor is hot, the
voltage should be rapidly changing, somewhere
between 10-1000 millivolts ((010-1.00 volts).
D8 NO CONNECTION
D9, DIO
INJECTOR CIRCUIT, CURRENT LIMITER
JUMPER - The electronic control module's
injector control circuit uses this jumper 10 com-. :
plete 11s path 10 ground through an intemal cur-
rent limiter. If this jumper circuit is open Or miss-
ing, the vehicle will nou start. If the circuit is
shorted to ground the vehicle may run, but with
reduced performance and poor driveability and
would eventually cause the fuel injector to not
operate.
D11
D12
D13
D14
015
D16
NO CONNECTION
AIR CONDITIONING COMPRESSOR
CLUTCH RELAY CONTROL - The electronic
control module supplies the ground path on this
terminal to energize the air conditioning com-
pressor clutch control relay. The voltage is less
than + volt when the electronic control module
energizes the relay, but the voltage 15 also less
than 1 volt if the electronic control module does
not receive the “Air Conditioning Request” input
voltage ar terminal "BE".
NO CONNECTION
NO CONNECTION
NO CONNECTION
FUEL INJECTOR CONTROL - The voltage at
this terminal comes through the injector which is
connected to +12 volts. With the ignition “ON,”
and the engine not running, the voltage is equal to
battery voltage. With the engine at idle, the
charging system increases this battery voltage
slightly. With higher engin: revolutions per
minute or more engine load, the increased injec-
tor pulse frequency and injector pulse width caus-
es Lhe voltage 10 be slightly less than at idle.
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
re
2-28 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
BLANK
VAZ SERVICE MANUAL TAROTTLE BODY INJECTION NIVA
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-29
SECTION 2.9A
DIAGNOSTIC CHARTS
CONTENTS
Diagnostic Charts Defined ….…..….….….......…..…..……nvereessarasaoue arnenracaarenananenbocavanenetonaoaonocavenocererenacenen 2-30
Tech 1 “Scan” Tool Typical Data Value ...................ecceremenener cen ener Dare LD DICTAR 2-32
Electronic Control Module Diagnostic Codes ......e......e.ceescenraonrmananenenmne on enence nan oanee aca een! 2-35
Chart A - Diagnostic Circuit Check ...............e..ereceorrenccenescancerero enero rDene ne recenen Penna ea nacon nenes 2-36
Chart A-1- No “Check Engine” Light ................—ere=-errrrseroreceraecanercanena ne Descanen in PaeDerereee 2-38
Chart A-2 - No Assembly Line Data Link Serial Data or Will Not Flash Code 12
(“Check Engine” Light “ON” Steady) ...................20meo0eneecerenen en e ee 2-40
1 Chart A-3 - Engine Cranks But Will Not Run ..........—. emma es everest ios 2-42
| Chart A-4 - Ignition Relay and Power Circuits Check eenneceacucacacenarenenoetenanenennennanenonaucoanas 2-48
| Chart A-5 - Fuel System Electrical Ci reuit Check crnnvrasens conveoanianenennenrn aves eoeas eneconee reee nee 2-52
Chart.A-7 - Fuel System Diagnosis ............ ide. .ceen ii eine caenenennenens 2-54
Code 13 - No Oxygen Sensor Signal -............ меннее enediooenennanenenseecaeea roce peon renveceraenctranene 2-58
Code 14 - Coolant Temperature (Signal Voltage Too Low) asosomecatn ess maanporapareanauermaneucnsaus 2-60
Code 15 - Coolant Temperature (Signal Voltage TOO High} …………verenenmenenençennensennn 2-62
Code 21 - Throttle Position (Signal Voltage Too High) vers en nee re er eEREA NEUERE EEE 2-64
Code 22 - Throttle Position (Signal Voltage TOO LOW) ……acrsesencenmenmenensennençennsnsne 2-66
| Code 23 - Intake: Air Temperature (Signal Voltage Too High) ............. vasernennisassrancaseanens 2-68
Code 24 - No Vehicle Speed Signal O O TES 2-70
Code 25 - Intake Air Temperature (Signal Voltage Too Low) .. A
Code 33 - Manifold Absolute Pressure (Signal Voltage Too High) .………-.i-crcamencerereneesccres 2-74
Code 34 - Manifold Absolute Pressure (Signal Voltage Too Low) .........—.——————em=esmmonenaoes 2-76
Code 35 - idie Speed Error N 2-78
Code 42 - Electronic Spark Timing Control Circuit Problem .................—emm.reseecacconeveneons 2-80
Code 44 - Lean Exhaust Indication ..........-..e—.ew== so... euideavenenaomenn rn aenaneaereana man nena necoorernana 2-82
Code 45 - Rich Exhaust indication ............—.—....«s=esesrececianeso een veerenonneconencanenennaerncooeceaces .. 4-84
Code 51- Calibrator Error «vive. O O 2-86
Code:53 + System Voltage Too High .............-eememaeneea ener n e Lee De DE 2-88
| Code.54 Octane Adjustment (Signal Voltage Too High or Too LOW) ..e.....e—.ezencnveeronas 2-30
Code 55 - Electronic Control Module Error ............ e... inec cone nece ne nene nna rene 2-94
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NVA
2-30 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
2.9 DIAGNOSTIC CHARTS DEFINED
INTRODUCTION
The diagnostic charts are designed to provide fast and efficient fault location for the fuel System, electronic spark
timing system and all other engine functions associated with the electronic control module. Each diagnostic chart uses
à pages: a “trouble tree chart” on thé right side page, and a “facing page on the left side page. The left side “facing
page” contains pertinent information, including malfunction code setting parameters and circuit diagrams. The trou-
page.
It is essential that the chars be used correctly. When diagnosing any problem, ALWAYS BEGIN WITH THE
DIAGNOSTIC CIRCUIT CHECK! The Diagnostic Circuit Check will lead you into the other charts. DO NOT GO
DIRECTLY TO A SPECIFIC CHART or false diagnosis and replacement of “good” parts could result.
After a fault is corrected and all codes have been cicared, il is advisable to repeat the Diagnostic Circuit Check to
ensure that proper repairs have been made.
When the electronic control module is operating in the DIAGNOSTIC MODE. the “Check Engine” light will
flash stored malfunction codes. | o
Each code displayed consists of a number of {lashes representing the first digit followed by à short pause, then a
number of flashes representing the second digit; followed by a longer pause indicating the end of the code. © >
Roa
Each stored code is displayed three times before proceeding to the next code. After all codes stored in memory
have been displayed, the entire flashing sequence is repeated.
Assembly Line Data Link Connector is located above the
Electronic Control Module,
which is mounted behind the left front kick panel.
— “GROUND
ASSEMBLY LINE DATA
= | ES ="
NN
h CAIRO LINK CONNECTOR
\ RARAS Front view
В и NEÓN Fe
| DIAGNOSTIC DISPLAY MODE: . 22 pia (er _ podi es
© JS IGNITONON à: 1° 11 : $ . 112 second [ ÓN а 3.2 second
® ASSEMBLY UNE DATA UNK "DIAGNOSTIC TEST > characters | 1, codes |
TERMINAL" GROUNDED WETTE ET aa TT o
E TMALFUNCITON CODES FLASH!
11! CODE 12 г IN A SIMILAR MANNER I
1 | EE EE Sr CRA ds is г сны к щи дн рн CEE
Lamu r=" [ow |
~~ 42 — | ; | |
L mad ==
“CHECK ENGINE" LIGHT FLASHES CODE 12 TO INDICATE
ELECTRONIC CONTROL MODULE SELF-DIAGNOSTIC ABILITY IS OK.
IF MALFUNCTION CODES ARE PRESENT, THOSE CODES WILL FLASH AFTER CODE 12 FLASHES THREE TIMES
EACH CODE FLASHES THREE TIMES 9-21-92
№% 14398
FLASHING “CHECK ENGINE® LIGHT --DIAGNOSTIC DISPLAY MODE
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
ble tree boxes with circied numbers are explained by the corresponding numbered paragraph on the left side facing
—— DIAGNOSTIC “TEST” TERMINAL ©
à
Ei
ETE
FAT: -
КЕЙ со.
FSE
e
an "ir
TN
ENT
paren
Cant ве
Ch WA
SP
=. к!
a
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION: 2- 31
- - ul
TOC . ит.
Fach diagnostic chart uses 2 pages: a “trouble-tree chart” on the right side page, anda
“facing page” on the left side page. The left side “facing page” contains pertinent information,
including malfunction code setting parameters and circuit diagrams.
Troubleshooting is performed by using the “trouble-tree” page. Extra information,
such as the reasoning behind certain tests, will be fisted on. the “facing” page.
TROUBLE TREE BOXES WITH CIRCLED NUMBERS (right side chart page)
CORRESPON DI NG NUMBERED PARAG RAPH (left side chart page)
are explained by the
FACING PAGE
TROUBLE-TREE CHART PAGE
ELECTRONIC
— CONTROL MODE
"CODE 4
COOLANT TEMPERATURE
(SIGNAL VOLTAGE TOO LOW]
1.7L THROTTLE BODY IKIECTION NVA
Lm dar geal lag: A maven med «pormiag ie a (CAT) ala. a ME]
a 20 valo.
- Test Description: Maske) hole vie va carcied
1 Co TA ana a 2.
a Conbat Morris ¡ar e Pl a
lora Ea CNA HA A ан
TT.
2. Ther vow diera Jr Toren 51 Tallow ir
brea des coria LONE E Va A
comal еловый! CIO” 16 pena Ls proud
(lara relka/rolcanos | ws sl se à Cause LA
.. The Tech 1 “Tcin” tool diplart engua amperes
a degróns Cria. Advair dar spp sa aran de (a
paraare menda ves loudly 16 sea 65-170 dan ve:
iii whim der derma e eo dea e e
else Dec I ¿piel Cine y :
Ext or 1 "Mermaid a “Type, Tau
ME”.
TYPICAL FACING PAGE
CODE 14
© CODUANT TEMPERATURE |
- (SIGNAL VOLTAGE TOO LOW)
1.71 THROTTLE BODY JECTION NVA
. i EF
TEL Ag CLAS CU AT EAL TY SCE CA LEAN im lr
TYPICAL DIAGNOSTIC CHART
5-59-91
MS 11493
Gy ac Hal 21213 ангп яз
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
81
2:32 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
2.9A DIAGNOSTIC CHARTS
TECH 1 “SCAN” TOOL
TYPICAL DATA VALUE
~~ The Tech 1 “Scan” Data listed in the table may be used for comparison, after completing the Diagnostic Circuit
(heck and finding the on-board diagnostics functioning properly and no diagnostic codes displayed.
A TECH 1 "SCAN" TOOL THAT DISPLAYS FAULTY DATA SHOULD NOT BE USED, AND THE
PROBLEM SHOULD BE-REPORTED TO THE MANUFACTURER. THE USE OF A FAULTY TECH 3
“SCAN” TOOL CAN RESULT IN MISDIAGNOSIS AND UNNECESSARY PARTS REPLACEMENT.
Only the parameters listed are used in this manual for diagnosing. For more description on the typical data values,
to diagnosis electronic control module inputs, refer to the “General Description and System Operation,” Section “1”.
If all data values are within the ranges illustrated, refer lo “2-B" “Symptom Charts."
>. - Test Description: Numbers below refer 10 cifled "4 Ighition “ON values are mé typical values thai —--
“members on the diagnöstic chart, ато соло) should. be setn-on-the Tech" 1 “сай” фо МВ то
a E ' DPA Оу ignition “ON,” and engine not running Temperature = -:
. sensors should be compared to he actual =
LIST". display pairs thar are displayed inorder, if - temperatures by letting the sensor sit ovemight and:
+1. The “Scan” position. refers 10 the Tech “FO: DATA
the “YES” bution is pressed. After “Time From then comparing their values, A difference of +5°C
Start” paraméter is displayed, by pressing the from the actual temperature may indicate a problem
“YES” button, the display pairs will start on the top with the sensor. Use the diagnostic aids chart for
ofistagain. ВЕ at sen
2. “Units Displayed" are the available ways of dis- values.
- playing what cach parameter is currently operaing — -. -Some “ON” or “OFF” switches may display an
es Ses.
e outputted. сос. Ae
(ER МИ;
-. AMOr:a value that is being sensed. or being“ -abhormal state. If the ¢han stafés his position js
RE HA LE met ho abnormal, then this may be causédiby ‘an‘open or . |
gle oy to ground, depending upon the normal state of ©
ei 3 “Typical Dara:Value™is. separated into two: parts: — hélswilch Ве fer 10“General Descriptión-añid: .-. -
+ These displayed values are. typical of a normally” =
-. “operating vehicle.. The ignitión ON“ comparison -
© should be performed first as this mäy léad io à quick 5. “ENGINE RUNNING” typical data values are an
identification of a failure. The Engine Running data average of display values recorded frofh normally .
should be compared tó the ignition “ON” data-as' a operating vehicles, and are intended to represent
diagnostic check to make sure the component or. what a normally functioning system would typically:
system is operating properly. display: -
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
that sensor to compare the resistance to temperature
~~ Operation” Section "1" for more information. 4.
LER
кома
Ш == сеял
a=
ae e me
=. mere ST
fas
. TA LA EI.
>
dep .
Es
A A
1
;
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-33
=. “ " -
ARTE hte 8
N
sm he ge че?
. a "a
TECH 1 “SCAN” DATA
(1) "SCAN" POSITION
0) UNITS
DISPLAYED
@ TYPICAL DATA VALUE, A/C "OFF", ENGINE WARM
(a) IGNITION "ON"
6) ENGINE IDLING
REFER TO
SECTION
ENGINE SPEED
REVOLUTIONS
“PER MINUTE
+ 50 FROM DESIRED IDLE
1.2
| DESIRED IDLE
REVOLUTIONS
|. РЕК MINUTE :. in
MEE
ELECTRONIC CONTROL MODULE EDLE
COMMAND [VARIES WITH TEMPERATURE)
1.2
| coouant
| TEMPERATURE
he, . . Le € .
7 . Je : ИН”,
NT 1
7 7 . .
" : "_—
“a
- cu
‚ Ч;
: ACTUAL TEMP.
"SHOULD DEQUAL :
. 85" - 110%
1.1
INTAKE AIR
TEMPERATURE
°C
1 VARIES WITH AMBIENT AND UNDERHOOD
AIR TEMPERATURE
1.1
MANIFOLD ABSOLUTE
PRESSURE
KPA/VOLTS
75 TO 105 KPA
3.5TOS5.0 VOLTS
DEPENDS ON BAROMETRIC PRESSURE AND
ENGINE LOAD
1.1
‘BAROMETRIC
PRESSURE
KPA
VARIES WITH
ALTITUDE
DEPENDS ON BAROMETRIC PRESSURE
1.1
“THROTTLE POSITION
VOLTS.
35-107"
35-70
0-100% 7
= ‘VEHICLE SPEED
KILOMETERS:
PER HOUR
o
À 0 =
cr
4 SYSTEM VOLTAGE
: VOLTS
11.5 —14,0
12.0 -15.0
1.2.
| OXYGEN SENSOR
VOLTAGE
MILUVOLTS
LESS THAN
200 my
95mV to 950mV
1.1
OPEN/CLOSED LOOP
DEBT En
OPEN/CLOSED |
OPEN
“CLOSED LOOP“ WITHIN 5 MINUTES AFTER
: STARTING E ENGINE
1.2
: encens SENSOR
READY
| Oui REMAIN “Y “YES” AFTER: STARTING В
À. ENGINE |
EXHAUST GASES
RICH/LEAN
EAN |
VARIES WITH OXYGEN — |
INTERPRETATION OF EXHAUST GASES
1.1.
DECEL FUEL CUT MODE
IN EFFECT
YES/NO
NO
NO
1.2
24-27-93
NS 14408
веды: 3 :
10f2
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
2-34 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
TECH 1 “SCAN” DATA
D "STAN" POSITION
2 UNITS
DISPLAYED (E IGNITION “ON”
© TYPICAL DATA VALUE, A/C “OFF” ENGINE WARM
© ENGINE IDLING
REFER TO
SECTION
FUEL ADJUSTMENT
ADAFTIVE MEMORY
- 100% =
+ 190%
0% FLUCTUATES WITH CHANGE IN MEMORY FUEL
ADJUSTMENT NORMALLY BETWEEN -10% AND + 10%
1.2
FUEL MEMORY CELL
0-35
35
1.2
ADJUSTMENT
“CLOSED LOOP” FUEL
_ - 100% -
+ 100%
0% FLUCTUATES WITH CHANGE IN “CLOSED LOOP"
{FUEL ADJUSTMENT. NORMALLY BETWEEN -20%
_— JAND +20% WHEN OPERATING IN “CLOSED LOOP" =
1.2
SPARK ADVANCE
0 BEFORETOP
DEAD CENTER TO
~ 60 BEFORE TOP
DEAD CENTER
NOT USEABLE {VARIES
WIDTH
FUEL INJECTOR PULSE
MILLISECONDS
3.9 OR HIGHER 1.8 ТО 1.5
1.2
AIR FUEL RATIO
NOT USEABLE |13.5- 14.7
CALIBRATION
IDENTIFICATION
VARIES
VARIES VARIES
1.1
a ENGINE RUNNING TIME
SINCE. LAST: START UP e
HOURS/MINUTES/
SECONDS
NOT USEABLE J VARIES WITH TIME
23
5 IDLE: AIR. CONTROL :
“POSITION” co
cou NT5
435 {sso
1.2 -
marges 1
AIR CONDITIONING
REQUEST SIGNAL
“YES/NO
NO CHANGES WITH REQUEST FOR AIR CONDITIONING
RE
AIR CONDITIONING
COMPRESSOR
CONTROL RELAY
ON/OFF
OFF CHANGES WITH COMPRESSOR STATUS
1.1
OCTANE ADJUSTMENT
VOLTS
[DEGREES |
0.00 VOLT
1.0 VOLT TO 4.7 VOLT
TO ; 5
0° TO 8°
1 EVAPORATIVE
| EMISSION CANISTER - |
| PURGE DUTY CYCLE .. |
INTAKE MANIFOLD
HEATER CONTROL
RELAY
QFF/ON
|. OFF "ION" OR OFF" DEPENDING ON COOLANT
TEMPERATURE AND INTAKE AIR TEMPERATURE
ITE
FUEL PUMP CIRCUIT
ON/OFE
“ON” “ON”
MOMENTARILY
THEN "OFF"
1.2
RADIATOR FAN
NOT USED
NOT USED
1,2
4-27—93
NS 14109
a
TN
AT ..
Sh
PY HRA TR
54
Zof}
VAZ SERVICE MANUAL THROTTLE BODY INJECTION MIVA,
Mr
Ese
a
Mita a
mE
A
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eta.
Чо
а
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a
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Pe
Го
+
i.
Lo
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-35
ELECTRONIC CONTROL MODULE DIAGNOSTIC CODES
E o наи | o $ TURN ON CHECK
| . DESCRIPTION | a + LR ee Lee ENGINE UGHT?
3
| no OXYGEN SENSOR SIGNAL Co YES
14
COOLANT TEMPERATURE - Signal voltage t too tow YES
15
COOLANT TEMPERATURE - Signa! voltage too high YES
21
THROTTLE POSITION - Signal voltage too high YES
22
THROTTLE POSITION - Signal voltage toc low | YES
“|: INTÁKE AIR TEMPERATURE - Signal voltage too high | YES
24 |
=
=
NO VEHICLE SPEED SIGNAL 17 a Ft YES
25
INTAKE AIR TEMPERATURE - signal voltage too low o — YES
33
MANIFOLD ABSOLUTE PRESSURE - Signal voltage too high YES
34
MANIFOLD ABSOLUTE PRESSURE - Signal voltage too low YES
- 35 ..
| IDLE SPEED ERROR | TEs
5 ELECTRONIC SPARK TIMING - Control Circuit problem o — YES
o LEAN EXHAUST INDICATION - MES E
—RICHEXHAUSTINDICATION $ YES
EC
CALIBRATOR ERROR —— Ns YES
| SYSTEM VOLTAGE TOO HIGH ВЕ YES
ул `
CA
La .
“Lah
‚ in -
: ; 5 < “OCT ANE. ADJUSTMENT CIRCUITS - Signal voltage too моно ог100 Jow. ES YES
7 me,
x . Г
„Lt 1
ETE
FR"
- MU
. “0:
U LA - . J
; ELECTRONIC CONTROL MODULE ERROR e o | Ye
6537
NS 14410] |
vAZ SERVICE MANUAL THROTTLE BODY INJECTION ММА
“2-36 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION _
ELECTRONIC CONTROL
| | MODULE
ASSEMBLY UNE | =
CONNECTOR 57 BLACK/WHITE Ч A9 Cot
front face view n | | 5 BROWN | DIAGNOSTIC TEST
О а. | | Ja 9 | | п — TERMINAL INPUT —
ATT | 2 LL = ed ELECTRONIC CONTROL
o ще GE du ENGINE = 83 BROWN “Ld MODULE GROUND
o Ш ПЕ Иня р SERIAL DATA. ВЫ
а “ CHECK ENGINE ue IS — LE LE 6 YELLOW LAS] COMMUNICATIONS * |
* т Dai | “33 BLACKAHITE 4 AS — se ENGINE *
| o | LIGHT
INSTRUMENT PANEL HARNESS CONTROL
. „TO- . =. .
ENGINE HAKNESS
CONNECTOR ° 8.15.97.
(8 terminal, white color) Ш _ NS 14330
$-15-92
CHART A
DIAG NOSTIC CIRCUIT сн ECK
“Circuit верной
~The diagnostic circuit check is an n organized approach to identif ying à problem created by an electronic engine
control system malfunction, It must be the starting point for any driveability complaint diagnosis, because it directs:
the service technician to the next logical step in diagnosing the complaint. Understanding the chart and using it
correctly will reduce diagnosis time and prevent the. unnecessary replacement € of 8009 parts.
BEER
56
Test Description: Number(s) below refer to circled
свите) onthe diagnostic. chant." : :
This Check is. to see ifthe bulb: is oK
If he “Check Engine light is “OFE” ma A: y
will check: for do ignitión ferdanid constan: 77
battery power 10 ihe electronic control module and
the electronic control module grounds.
This check is done 10 sec if the electronic control
module has the capability to control thé “Check
- Engine” light. With the assembly line data link - .
diagnostic “test” ‘чело! “В grounded, the : “Check.
REE
followed by any ditgnoslic codes stored in. memory. 5
| Code. 12. means there is no crankshaft reference
signal Coming 10 the clecuonic control module, this
“ds normal. becatise the engine is.no1 rurining.
This check is used to see if the electronic control
module can supply serial data for Tech 1 “Scan”
tool use. If an engine calibrator error is present, the
electronic control modulc may have the ability 10
flash a Code 12 but not enable serial data.
This test is used to see if “Cranks But, Will Not
Run” sympiom is caused by an electronic. control
module problem or the vehicle electrical system.
1 .
но =
1 =e. yma eee. e
Fs O hen eran
cd de “= disgrosig ue
À т L THROTTLE BODY: INJECTION. Nava о т
6 TH Check. 15.10: see ЧЕ the: electronic: соли. module-
BASA codes. stored: in its: memory: 10 radi in
el
Ts
Es.
В
o
ue
ón
es
a
TD
EA
MT IEA
“in ‘normal state: wit: Just: the ignition’ O N° aña
- engine fot ‘running. In ‘particular. Took at the.
barometric pressure reading from the. manifold
absolute pressure sensor voltage and kPa values.
Are they normal for your altitude, use CHART Cl-
“D, Lôok ät the coolant femperatute sensor value to
‘sec iPthe value is reasonable or ifitis shifted above
of below where it should be. © ut
1
“A,
= i “
; 8180 the’ actual data: is not within the typical vides
| “established; the charts in Section *2-C* “Component
Systems Chdns™ will provide a functional check of
1he suspect component or system, |
Diagnostic Aids:
II assembly line data link senal data output circuit
(Yellow, wire from electronic control module terminal
“AS” to assembiy line data link terminal “M™) is shored
10 +12V, there will be no serial data output. See CHART
A-2,
VAZ SERVICE MANUAL THROTTLE EGDY INJECTION NIVA
ARES ov
E ee AE TER Te rt RE, Sa 2
3 de ‘Look a alí he pan © S detiene ira ones’ Tot
x =,"
..
‘а " - vo "
. - A
A Rp TN DE
. . .. nt a
=T ada aa. . es 45 A
. AL LE
e a TE De
e no 2
ЕДЕ СКО’
= a
=
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due CI
TL
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rd -
—
. E e : .. .
FE pas ut ï
=
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Yih …:
i
E Aa .
| a.
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E ur _ -
. EOL 3
=
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i
=
u 75
ENGINE MANAGEM ENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-37
CHART A
DIAGNOSTIC CIRCUIT CHECK
9 IGNITION “ON,” ENGINE HOT RUNNING.
+ — CHECK ENGINE LIGHT.
1,7L THROTTLE BODY INJECTION NiVA
® om ur] © NO LIGHT | - | FLASHING CODE 12 |
Lon - À
e JUMPER ASSEMBLY LINE DATA LINK 1 | USE CHART A-1 | CHECK FOR GROUNDED DIAGNOSTIC
TERMINAL “E” TO “A”. a ст === ..—— . TEST INPUT CIRCUIT {BLACK/WHITE
on
O
WILL ENGINE START AND RUNT |
17) TAF MORE THAN ONE CODÉ IS |, SELECTFO:DATALIST.
— | DISPLAYED, STÄRT WITH, LOWEST - e COMPAREFACH TECH PARAMETER WITH: TYPICAL. .
| CODE NUMBER. | DATA VALUES SHOWN ON: PREVIOUS A PAGES.
DOES CHECK ENGINE LIGHT FLASH
CODE 12 ATLEAST 3 TIMES?
WIRE) TO ELECTRONIC CONTROL
MODULE TERMINAL "AS". USE
WIRING DIAGRAM OR CHART A.
Nor
НЙ = а Em Чан = ня чт =
3
. M we wr = CECE ЧН ЧН =
! USE CHARTA-2 |
. Neon я
Е!
SELECT F2: TROUSLE CODE.
eo" TECH TOOL USE: EXIT KEY ANO RETURN | use CHART AZ ET Ti
TO SCREEN TITLED ” SELECT MODE Y |“ . NEXT, E iaa A no e
ARE ANY TROUBLE CODES DISPLAYED?
“REFERTO. APPLICASLE CODE CHART: i
5 (т) #. ONTECH 1 TOOL, PRESS "EXIT" KEY ONCE. THEN -
CES]. ARE VALUES NORMAL ANDÍOR WITHIN. TYPICAL.
ele] RANGES?
————
REFER TO; "SYMPTOM REFERTO: "COMPONENT
CHARTS,” SECTION 2, SYSTEMS CHARTS,”
SECTION 2.
4-27-93
NS 14331
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NA
88
2-38 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
FUSIBLE LINK
ENGINE BLOCK
GROUND
E EF del der dir == —
i oe i ml]
IGNITION
2
A (M FUSE
6
INSTRUMENT PANEL HARNESS
.TO-
ENGINE HARNESS
ELECTRONIC
3 RED CONTROL MODULE
г=-==-- 8 RED BATTERY +
| | IGNITION 9 RED BATTERY +
Chaar | A |
Pre TTT
‘| Y i
FUSE Y (GREEN) CONTO SYSTEMS
— ус Fag |IGNITION SWITCH
Bi PINK/BLACK tJ VOLTAGE INPUT SIGNAL
Я
ENGINE GROUND 52 33 BROWN ELECTRONIC CONTROL
Attaches to engine ip 54 BROWN MODULE GROUND
at ignition module BROWN
. bracket
я ASSEMBLY Ling DATA 1. ERIGE SPEED I
no LINK CONHECTOR ! L SENSOR |
A he re mn ll de y e
CHECK ENGINE
“UGHT .
Po 38 BLACK/WHITE as
CHECK ENGINE _
LIGHT CONTROL”
CONNECTOR
(8 terminal, white color)
9-15-92
NS 14333
CHART / A-1
. NO “CHECK. ENGÍNE" LIGHT a
1.7L THROTTLE BODY INJECTION ММА.
Circuit Description:
There should always be à sicady ‘Check Engine” light, when the ignition is “ON™ and the engine is not running.
Switched ignition voltage is supplicd from YAZ fusc directly to the light bulb. The electronic control module will
control the light and tum ir “ON” by providing a ground path through the Black/White wire to electronic control
module terminal “AS”.
Test Description: Number(s) below refer Lo circled .
e on the diagnostic chart.
terminal “AS”
2. This step checks the clectronic control module is
receiving power on its three power supply terminals:
“B17, "C16", and “A6",
3. This step checks the electronic control modulc-La-
engine block ground circuits on electronic control
module connector terminals “A 12” and "DI",
= Diagnostic Aids:
Module terminal “A6” 10 Fuse “Y” is shorted'to voltage
“the engine will not stop running and/or thé dash lights
Will be “ON.”
If the “Check Engine" light is “OFF” and the test
light is “ON” in Step 1, there may be a short 10 12 volts
between “AS” and the “Check Engine" light. Check for
open wires, bad connections or a bad bulb before
- assuming that ¿here is a short to 12 volts.
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
255; If ignilion switch: voltage í input circuit it (electronic 5
- Step 1 checks the operation of inc control circuii * control module Pink/Black wire from electronic contro!
wire Lo the electronic control module connector
Ne A
E.
Eu
Me et +
Ее
À.
EE
E
A
mures
% + , 4
“em 4
. HA 1
3
Г
= wy
A
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-39
alas Fas + ELECTRONIC CONTROLMODULE] TERMAINALS: "1 |< volts ion BLACIOWHITE WIRE #38 BETWEEN est
2 © «wird TÉSTUEHT CONNECTED TO «12 VOLTS,
CHART A-1
NO “CHECK ENGINE” LIGHT
1.7 THROTTLE BODY INJECTION NIVA
| ARE FUSES OK? |
— REPAIR SHORT TO GROUND IN
| CIRCUIT WITH BLOWN.FUSE.
(+) * IGNITION "ON; "ENGINE“OFE“ ;
e WITH TEST LIGKT CONNECTED TO GROUND, SACKPROBE
ELECTRONIC CONTROL MODULE CONNECTOR TERMINAL “AS”,
+ OBSERVE “CHECK ENGINE” LIGHT.
IS THE CHECK ENGINÉ LIGHT "ON Y
NO. p—— | * CHECK FOR FAULTY CHECK ENGINE LIGHT BULB
| — AND CONNECTIONS.
YES TS PORT LS e CHECK FOR OPEN IN WIRE TO ELECTRONIC
— | | CONTROL MOOULE TERMINAL “AS”.
— — » CHECK UP HARNESS CONNECTOR: © = -
® °* WITH TEST LIGHT CONNECTED TO GROUND. BACKPROBE - | “TEST LIGHTIS TON” CHECK FOR SHORT TO 12
ns E be SE 06 AN ¿LIGHT AND CHECK ENGINE LIGHT.
DO ALL THREE TERMINALS LIGHT THE TEST LIGHT?
e REFERTO CHART A-4 “IGNITION
RELAY CIRCUIT CHECK.”
-BACKPRÓSE ELECTRONIC © CONTROL MODULE
TERMINALS: ©.
, Tons . .
Te : nta . . . 1 . - . "ar : . - - " :
: то; 215 nn . "1 . "a oe tas . ….. : : — 2" : - =~ - D . : . : or =
Mie ar pie ... DA. - Coat te . TN = e . . р Loa я FEE Lt . " "e К ' . nL
+. .... - оке . . " E. . . . : . : - . " . р” -
ti ta. . „x - К a . . "
TAIZ” a) a Cre
00 BOTH TERMINALS LIGHT. THE TEST LIGHT?
REPAIR OPEN CIRCUIT IN GROUND WIRE
THAT D(D NOT LIGHT TEST LIGHT.
"| FAULTY CONNECTIONS OR FAULTY ELECTRONIC CONTROL MODULE.
4-27-93
NS 14334
VAZ SERVICE MANUAL THROTTLE BODY INJECTION ММА
0
| 1. If “Check Engine” light i Is CON," but very dim: und
2-40 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
ELECTRONIC CONTROL
TT MODULE
ASSEMBLY UNE
AT o
CONNECTOR 57 BLACK/WHITE | AS 5 VOLT
front face view qu" BROWN DIAGNOSTIC TEST
8 LA | TERMINAL INPUT
ELECTRONIC CONTROL
2 M ENGINE == 3 BROWN A17 | MODULE GROUND
GROUND
SERIAL DATA
62 YELLOW AS | COMMUNICATIONS
VAZ FU CHECK ENGINE
VAZ FUSE O, EN:
77g - 38 BLACK/WHITE AS 7] gu ENGINE
1 LIGHT
INSTRUMENT PANEL HARNESS
PANES CONTROL
—. ENGINEHARNESS |
. CONNECTOR 9-15.92
(8 terminal, white color) | HS 14339
CHART A-2
NO ASSEMBLY LINE DATA LINK SERIAL DATA
R
О
о WILL NOT FLASH CODE ‘12 |
ie (HECK ENGINE“ LIGHT “ON”: STEADY)
AZ - THROTTLE BODY INJECTION NIVA
N 5 Circuit Description:
There should always y be a steady “Check Engine” lighy when the ignition switch is “ON” and the engine is not
running. Switched ignition voltage is supplied directly to the “Check Engine” light bulb. The electronic control
module will tum the light “ON” by supplying the ground path on clectronic control module terminal “AS”,
When the ciectronic control modulc’s diagnostic “cst” terminal * A9” is grounded, the electronic control module
commands the “Check Engine light to flash a Code 12, followed by any code(s) stored in memory. The Tech. 1
Pos Зы “Scan” tool, when the F1: Field Service” key | is pressed. Supplies a ground for assembly line data link térmirial “В”.
Test Descri iption: Number(s) below refer io circled | 4 This: siep' checks. for an: open circuit between EE
+ E number(s) on the diagnostic char я |
ne
| electronic control module terminal HAD. o
Assembly line: dara ink connector temninal “B” and
‚the engine will not start, check connections “D1”
and “AlZ"” for proper tightness. Also, ensure thai
they are clean.
AL this point, the “Check Engine” ight wiring i is
OK. The problem is a faulty electronic control
module or engine calibrator. If Code 12 does not
flash afte lacing the electronic control module,
2. 1f the “Check Engine” light goes “OFF” when the | replacing
then replace the engine calibrator also.
electronic control module conneclors -are
disconnected, then the “Check Engine” iight control Diagnostic Aids:
circuit 38 {Black/White wire) 10 electronic. control us
module terminal * AS i 1S not shorted Lo ground... - [ei “Check: Engine” light control circuit, or an open-in the
: 3, The electronic. control module can’ ‘Nash a Code 12 5 “diagnostic” test 1erminal input circüil to the éléctronic
- but may not be. able to output serial data to the control module.
assembly line data link connector terminal “M”. IF
the Tech 1 “Scan” tool does not display serial data
AND the “Check Enginc” light is Hashing Code 12,
THEN check 1he Tech 1 “Scan” tool on à good
vehicle. If he Tech 1 “Scan” 1ool and the serial data
output circuit are OK, then the connections, the
electronic control module, or the engine calibrator
may be faulty.
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
A sicady. light suggests a short to ground in ‘the :
|
' «ато.
TT,
EST
PRES) =
oth
ил
ra
==
E
RA
e Mea
E: BAS e
ET
we Pal „2
— °
oY
= my "Yi
rr
7
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-41
CHART A-2
NO ASSEMBLY LINE DATA LINK SERIAL DATA
OR
WILL NOT FLASH CODE 12
(“CHECK ENGINE” LIGHT "ОМ" STEADY)
X JL THROTTLE BODY INJECTION NIVA
© e IGNITION “ON,” ENGINE “OFF.”
IS THE CHECK ENGINE LIGHT "ON*?
e ASSEMBLY UNE DATA LINK CONNECTOR DIAGNOSTIC "TEST* TERMINAL "E" NOT GROUNDED,
AND TECH § "SCAN" NOT CONNECTED TO ASSEMBLY LINE DATA UNK CONNECTOR,
a]
{THIS GROUNDS THE DIAGNOSTIC“ TEST® TERMINAL "87.
- DOES CHECK ENGINE Вент; FLASH CODE 12:AT1 LERS
[+ connecrrecs SCAN TOOUAND ENTER “FIL FIELD SERVCE CE MODE
$T THREE TEST
© à IGNITION "OFF."
e DISCONNECT BOTH ENGINE CONTROL MODULE
CONNECTORS.
o IGNITION “ON.”
— IS CHECK ENGINE LIGHT “ON?”
Fan =. Tidep pet :
4" TEE A Ta TE LA . TREE TT. ЛД
— pi EI E i LOMME CT .. Pr cc.
= Jr iF NO ASSEMSLY UKE DATA LINK DATA: CHECK
SERIAL DATA COMMUNICATION CIRCUIT (62
YELLOW WIRE) FOR OPEN OR SHORT TO GROUND
BETWEEN ELECTRONIC CONTROL MODULE "AR"
AND ASSEMBLY LINE DATA LINK CO NNECTCR
| TERMINAL “MM”, .
CALIBRATOR IS FAULTY.
#F OK, ELECTRONIC CONTROL MOQULE OR ENGINE
CE etme earn Lo
— REPAIR SHORT: то GROUND IN CHECK
e EDO! ENGINE LIGHT CONTROL CIRCUIT 36
sn. + 4 © 1 BLACKANHITÉ WIRE BETWEEN CHECK
“ENGINE LIGHT AND ENGINE CONTROL
у IGNITION ‘ “off” | |
RECONNECT ENGINE CONTROL MODULE CONNECTORS.
IGNITION "ON," ENGINE NOT RUNNING, 3
BACKPROBE ENGINE CONTROL MODULE CONNECTOR:
Е TERMINAL “Ag” WITH TEST UGHT CONNECT ED TO GROUND,
7 LEAVE CONNECTED. Е
1. © DOES CHECK ENGINE UGHT NOW FLASH coot 127
- = # 0 8
ШИ MODULE CONNECTOR TERMINAL TAS",
m PROBLEMS EMTHER AÑ "OPEN CIRCUIT” 57
ww Ew TS RA ENT CU г tu
AI E CAST oil y
nd UT. 1 ke = ot ru — -
Fo
= Ne tea eNiomES AERATOR K FORPROPER INSTALLATION
CX] UIE OX REPLACE SLE CINONIC CONTROUMODULE.
x E E © PERFORM DIAG SNOSTIC CIRCUIT CHECK CHARTA
DOES CHECK: ENGINE LIGHT FLASH cook 12 LAT LEAST
- THREE: TIMES?
Е
“7 | BLACK/WHITE WIRE BETWEEN ASSEMBLY LINE. |
| DATA UNK CONNECTOR TERMINAL: "3" AND -
ENGINE: CONTROL M MODULE CONNÉCTOR.
—| TERMINAL“ AS", © | .
E
«OPEN GROUND CIRCUIT? 51 BROWN WIRE TO
ASSEMBLY UNE DATA UNK CONNECTOR -
TERMINAL A .
“| SYSTEM OK.
AEPLACE ENGINE
CALIBRATOR.
9-17-92
NS 14336
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
91
Es “test Description: Number(s) below refer © oe
Ln number(s) on the diagnostic chart: - | VE
CL deis essential ‘thar CHART A; “Diagnostic Circuit
2-42 SOT SYSTEMS 1.74 THROTTLE BODY INJECTION... Ш
ELECTRONIC |:
CONTROL MODULE | |
SERIAL DATA
62 YELLOW —[+ | COMMUNICATIONS
COIL \
IGNITION
ASSEMBLIES MODULE {COOLANT TEMPERATURE SiGNAT 10
il
ASSEMBLY UNE. DÂTA
LINK CONNECTOR В
‘front face View
_ THROTTLE POSITION SIGNAL” т cu
u MANIFOLD PRESSURE E SIGNAL Y cit |
osa | >| "| >
i
J
rs es
aloha or
AE = — — — + — 42 io — = ear SIGNAL -
FUEL SYSTEM RELAY}
GREEN A
EE,
É—"
; .
. .
ran
mors Te : . :
LT os .
“en La PE Lo
A ` : .
| = 4". "5 a : .
x 1
"e к . .
E . de
+ 30 ——
A
г .
INJECTOR
CONTROL
Е
mam lO
Coa le,
toi "2х . "
- . " a .
. ar
pr "
et
a “"
E `
=” „ .
DIRECT IGNITION
SYSTEM
=
. INJECTOR. {f_
BE
INJECTOR CCU” о
CURRENT LIMITER a
= | a149
NS 15206
ET. a
+.
ls
Ta
SF
(Page 1 of 3)
ENGINE CRANKS BUT WILL NOT RUN
1. THROTTLE BODY INJECTION NIVA
_ Circuit Description: EEE e aa:
REA :
. . J Th: Зри i
= E У MUA Ня E
eno
=
Before using this chart check: baten с condition: engine a. so -
EA aa
|
E
TL
A
pe
.. A .
"o a
Lo. Se .
ea ms .
- Е >
1 :
fa . .
ata ав"
[3 ща не” re
EII, cE
Sie Tut
Ai Bem
5 ¿role mr ro the: relay "OFF" Sa
ee seconds: Have a: sin ten tp run: o
e ning ät thé‘fear of. vehicle." A mala
Check" be formed first, CHART A will deter- |
mine if: pe will deter 4. This step checks for sufficient voltage at the spark
- plug end of the spark plug wire. Wire #1 and #2
‚ must be tested individually. Wire #1 and #2 connect
circuits are OK. сю. different i ignition coils, so both ignition coils are
e Electronic control module self Y diagnostic ability _ checked. |
is operating; - AUT 5. With | the fuer: injector: cic disconnected. |
«- Tech 1- Scan’ 1661. dan. communicate with the PU ‘there Should: be NO fuel delivered.-
electronic control module.” ere FS -This's step checks fora short io ground o on the i injec-
e Electronic control module power and ground
F
4
“=
-- M iricorrect, these sensor input sigh y 10 the elec:
tronic control module can causé a NO-Starr.
Any time the electronic control module has been
“OFF” for at least 15 seconds, it energizes the fuel
pump relay for 2 seconds after the ignition switch is
tor control circuit, If this occurs, the engine would
“be “flooded” because the injector would spray fuel -
continuously, without electronic control module
control.
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NiVa
3
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-43
o
os
Ge USING ST-125 SPARK CHECKER TOOL 1 26792, CHECK FOR SPARK AT SPARK PLUG
=)". WIRES WHILE CRANKING. (A FEW SPARKS AND, THEN NOTHING 15 CONSIDERED.
- ll
CHART A-3
(Page 1 of 3)
ENGINE CRANKS BUT
WILL NOT RUN —
| 4.7L THROTTLE BODY
INJECTION NIVA
TO VERIFY THE ELECTRONIC CONTROL MOD
THE CHART À “DIAGNOSTIC CIRCUIT CHECK”
THROUGH STEP $ BEFORE USING THIS “WILL NOT RUN" CHART.
ULE'S SELF-DIAGNOSTICS ARE WORKING,
MUST HAVE FIRST BEEN PERFORMEOD - :
CHECK.
+ SELECT "FB: DATA LIST,”
. COOLANT TEMPERATURE.
mis wi = am am ws AF TF == =m mr
- THROTTLE POSITION, IF OVE
. CONNECT TECH 1 SCAN TOOL.
ARE THE FOLLOWING PARAMETER VALUES WITHIN RANGE?
If BELOW — 20°C, SEE CODE 15 CHART FOR SENSOR RESISTANCES.
22.5 VOLTS WITH THROTTLE CLOSED, SEE CHART C:
= MANIFOLD ABSOLUTE? PRESSURE SENSOR VOLTS. If NOT BETWEEN 3 AND S VOL
a"
cio WL
TIN NE
r :
A НЫ
TE
I€ NOT “ON.” RETURN TO CHART A, “DIAGNOSTIC GRCUIT
15 SEE CHARTE: 10,
cote ee be babe rat =
IGNITION “ON,” ENGINE STOPPED.
“CH ECK EN GINE” LIGHT SHOULD BE “ON.”
1
I
F
L
i
I
È
i
i
1
1
1
+ LISTEN FOR FUEL PUMPRUN
DOES IT?
# FUEL PUMP SHOULD RUN FOR 2 SECONDS AFTER IGNITION
e IGNITION "OFF" FOR TS SECONDS.
NING WHEN IGNITION is SWITCHED “ON
“ON,” THEN TURN “OFF.”
"NO SPARK") --
; - 15 THERE SPARK FROM BOTH, SPARK PLUG LEADS. LA AND #2 WHILE RANKING? E
IE EE
- - a. "1
z
wp = owe A = I -
Do Ra
* DISCONNECT ELECTRICAL CONNECTOR FROM FUEL INJECTOR.
DOES FUEL INJECTOR SPRAY WHILE CRANKING ENGINE?
SEE FACING PAGE, TEST.
DESCRIPTION, STEP 2.
r-
| SEE FUEL SYSTEM ELECTRICAL v
Fb CIRCUIT CHECK, CHART AS. 3
gm ale EE mls el WR We mh EW == We A == о
ph EE EE WE we EE WE wr НН EE We ye EEE TE
FE NITION SYSTEM PROBLEM. 1
{ SEE CHART C4. _—]
: era tee, ..
ибо Lh [FE . =
{odes MUECTOR TE
PAT OC EST
- о сонет qUECTOR CIRCUIT TESTS LIGHT roc 38730: 28) TO HARNESS
CON! R | |
IN OrEZFOR: E В
OR TESTLIGHTAS IGNITION IGNITION IS TURNED "ом." he
| DOES NOT LIGHT | Ш
| [СОМПМЧЕТО РАСЕ2 ОРЗ. | 7
{ REPAIR SHORT то GROUND ON
1 ELECTRONIC CONTROL: MODULE |
. [CONNECTOR Y TERMINAL "D16”.
В TAULTY, y MIECTOR |
SET AND/OR O-RING.
“оо
ei
i
LIGHT FOR APPROXIMATELY 2
SECONDS AFTER IGNITION 15
TURNED “ON,” THE GOES out
1
INJECTOR CONTROL CIRCUIT TO
4-27-93
NS 15801
VA? SERVICE MANUAL THROTTLE BODY INJECTION RIVA
Ex
2 {ENGINE MANAGEMENT SYSTEMS 1.2. THROTFLEBOBYINIECHON
RO e!
не
ELECTRONIC
| ASSEMBLY LINE DATA
в | A | LINK CONNECTOR CONTROL MODULE -
front face view
SERIAL DATA
62 YELLOW —{ as” COMMUNICATIONS
COIL
IGNITION JA| | с=---=-=е==-ееееееннно
ASSEMBLIES | [SNTION 5 [COOLANT TEMPERATURE SIGNAL-—21 c10
TE 4 1 IA] SRE Sr RN
h pin 1 "
ve E \ 42 VIOLETAWHITE 5 REFERENCE INPUT SIGNAL
1 Ll e rs то >> 1 | :
== IFUEL SYSTEM RELAY! 2
— ——— INJECTOR
GREEN 4 PIN CONTROL
- | — — 64 BLUE
DIRECT IGNITION Do й
SYSTEM. _ sde
el veh a |
ue | “éctokarcur NC
‚ РУМР. CURRENT UMITER >
9-14-92
NS 15206 =
CHART A-3
{Page 2 of 3)
ENGINE. CRANKS BUT Я шмот RUN -
a 7 THROTTLE BODY Y INJECTION NIVA.
i т Circuit Description: с а
Before using this Side cheek: pair condition, engine > cani spocd 1 fuel quaniy ahd Quality.
Test Description: Numbers $6) below refer to circled
number(s) on the diagnostic chart.
7. The electronic control module normally provides
10
electrical pulses (to ground) to operate the fuel
injector. This step checks for these electrical pulses
while cranking. | -
. This-step checks for fuel spray. whet ue injector 7 i being) $e nerated: Tf ihe-Tech: 1 displays. any engiñe es
receives the electrical pulses verifiéd in Step Ta speed above zero, he signal is being. received ‘and ; 3 -
“there is: fuel Spray; see The next (bottom) box for
dus ww.
a possible causes ra “WILL NOT RUN.” :
. Incorrect fuel pressure can cause a “WILL NOT
RUN.” If fuel pressure is OK, the mjector is faulty.
The electronic control module must receive “refer-
ence signal input” pulses from the ignition system,
Lo calculate any “engine running” functions. The
Tech | will show the engine speed if the electronic
control module is receiving this reference signal.
11.
-ence.: Signal wire going.
NOTICE: If engine speed is indicated bar less than
80, check for and repair ¢ cause of low cranking
speed. . |
With the test light connected to “+” voltage, by
— quickly, repeatedly, momentarily touching the refer- ~~
| ‘to the electrónic control: -:-
Module a | substitute” source of. Signal púlses: is. LT
interpreted by the electronic control ‘module;
12.
Jumpering the + battery terminal 10. pin “Gr will
power the injector with + voltage. (See main wiring
diagrams, page 2 of 5, located in Section 2 of this
manual.) Al the injector hamess connector, only the
Pink/Black wire should have voltage to light the test
hght.
VAZ SERVICE MANUAL THROTTLE BODY INJECTION MIVA
Temenos = .
ВА EI
EA
a
y
= acuap : Е
ES e A
Hg pa
me
=
E
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-45
CONTINUED FROM P. E Tora (Page 2 of 3)
В ' | CONTINUED FROM PAGE 1 OF 3 7
- pen een med ENGINE CRANKS BUT
(7) e WATCH INJECTOR TEST LIGHT WHILE WILL NOT RUN
CRANKING THE ENGINE.
DOES TEST LIGHT BLINK? 1.7L THROTTLE BODY
_ INJECTION NIVA
e “REMOVE INJECTOR TEST. LIGHT FROM HARN NESS CONNE CTOR.
® ‘RECONNECT HARNESS CONNECTOR TO INJECTOR.
¢ LOOK FORFUELSPRAY FROM INJECTOR. :
DOES FUEL SPRAY WHILE CRANKING ENGINE?
e CHECK FOR: IGNITION “OFF,”
- FOULED SPARK PLUGS. INSTALL FUEL PRESSURE GAGE. (SEE CHART A-7 TO
. RESTRICTED EXHAUST SYSTEM. REFER DETERMINE WHERE TO CONNECT FUEL PRESSURE GAGE).
TO CHART B-1. e IGNITION "ON."
. INCORRECT FUEL OR WATER/FOREIGN v FUEL PRESSURE SHOULD BE 190 TO 210 kPa (27.6103 30.5
| MATERIAL IN FUEL. PSI, 1.9-2.1 BAR).
À. a —. SPARK PLUG WIRES "CROSSED.” - : | | 15177
of { 4 ¡CONNECTED INTO WRONG SPARK ge
E es |
| > INCORRECT FUEL PRESSURE. REFER ró
Els ne SEE SAMASHAF THING Cai stieeco SR TAULITINIECIOR: CHECKFOR Y с | pon “FUEL
Per Sd ое | |'SHORTTO GROUND IN EL NI
Ue mee LE “ADEQUATE ENGINE COMPRESSION, : | CONTROCMOOULE TERMINAL | DIAGNOSIS.” |
a ERR AR ETT Co EEES CR "597 AND “D10” CIRCUIT. в CHART A- -7. !
20. E
neo. . `
“м TTY .
ля т
LO
LL
mda,
a
pe £4 E
Ta is my or a a EE EW
= EY
e INSTALL TECH 1. SELEGT "FO: DATA LIST.”
Am MONITOR “ENGINE SPEED” WHILE HOLDING THE IGNITION SWITCH
KEY IN THE “START” POSITION
15 ENGINE SPEED INDICATING MORE THAN 80 WHILE CRANKING?
es] CT
- “Gi à ' 'DISCONNECT TECH 1.SCAN TOOL: > Fe DISCONNECT PIN HARESS CONNECTOR EROMIGNITON
> | WITH A FUSEO JUMPER WIRE, ABER THE © 87 MODULE
4 BATTERY TERMINAL TO PING" OF THE: ASSEMBLY | я) ~ IGNITION “ON.
| | LINEDATA CINK CONNECTOR. = Fe CONNECT TEST LIGHT CLIPLEAD TO "+ “BATTERY TERMINAL... :
2; fe IGNITION “ON,” DISCONNECT FUEL INJECTOR. - Ta OBSERVE TECK.1 "ENGINESPEED” WHILEUSING TESTLIGHT : ©1722 1
E E qe “WITH A TEST LIGHT CONNECTED TO GROUND, ob] TO QUICKLY AND REPEATEDLY. TOUCH TERMINAL TE” ors piv =
кажет “3
|: TOUCH EACH DF THE Z TERMINALS OF THE - J HARNESS CONRECTORREMOUVED FROM IGNITION MODULE:
{DISCONNECTED INJECTOR HARNESS CONNECTOR. _> e TECH 1 SHOULD INDICATE AN ENGINE SPEED ABOVE ZERO.
-ye: OBSERVE TEST LIGHT ON EACH TERMINAL. DOES IT? -
. . N
| FAULTY CONNECTION | | PROBLEM IS EITHER A CIRCUIT FAULT ON
o | OR 11 | THE "REFERENCE INPUT SIGNAL”
AE Te TT DEFECTIVE IGNITION - | | VIOLETAWHITE WIRE BETWEEN 6 PIN
oe SAL Ea tie ae TS 20: , EMODULE. =..." 1; IGNITION MODULE CONNECTOR TERMINAL
Jr LESA Te a TT eee { ETT) ELECTRONIC CONTROL MODULE.
Gen ne ee wp Tn DEALER ОО TERMINAL nas, AOL MODULE, VER RIFY
Вары см МЛ con a lat. in ELECT L y
PETIT e DAT ем E DL MA IO IE TT e ECONO EAULT (OPEN, SHORT TO. |
EEC rs SO TO ENT 2 frT DT AAA ROUND. SHORT TO. VOLTAGENS PRESENT ||
E PE e RATE 1 TB — | stronestrcacilo ELECTRONIC CONTROL
TR ERE E NT RI Ea TE ‚MODULE, | |
mi
"E “ "о
1071.
fs [LIGHT “ON” ONE TERMINAL ONLY | | NO LIGHT EITHER TERMINAL | | | LIGHT “ON. BOTH TERMINALS |
DISCONNECT FUSED JUMPER WIRE | | REPAIR OPEN CIRCUIT IN PINK/BLACK REPAIR SHORT TO VOLTAGE ON BLUE
E FROM DATA LINK CONNECTOR “POWER SUPPLY” WIRE TO INJECTOR, “INJECTOR CONTROL CIRCUIT” WIRE.
‚4-27-93
NS 14404
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
Test Description: Number(s) below refer to Seine A
2-46 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
- fefa| ASSEMBLY LINE DATA ELECTRONIC |
LINK CONNECTOR CONTROL MODULE
dell ro face view mm
ena SERIAL DATA |
62 YELLOW AS | COMMUNICATIONS
COM |
IGHITION tA] | = pee
ASSEMBLIES | mopule |= COOLANT TEMPÉRATURE SIGNA Г сто
+ | = £ “THROTTLE POSITION SIGNAL } [en]
д] | TROTE OON TENA >
— e
= я | MANIFOLD PRESSURE SIGNAL > ca
с
D CRANKSHAFT POSITION AND ENGINE SPEED SIGNAL | |
rides | [E} Se 42 VIOLETAWHITE | Std REFERENCE INPUT SIGNAL |
A = | © | F . : . : ; . TO A NN |
IE: = В | JFUEL SYSTEM RELAY
ps Tal bom ea INJECTOR
¡Pee = | LL GREEN A PINK, CONTROL
Te с 64 BLUE о15 —
DIRECT IGNITION оо |
FUEL 22 BLACK
Neo (28AK fm]
FUEL INJECTOR CIRCUIT
PUMP. CURRENT LUMITER _/.
9-14-92 | * ‘ a
NS 15206 ОЕ от
CHART A-3
(Page 3 of 3)
ENGINE CRANKS BUT WILL NOT RUN
1.71 THROTTLE BODY INJECTION NIVA
Circuit Description:
Before using this chart check: battery condition, engine cranking speed, fuel quantity and quality.
a number(s) on the diagnostic chart...
96
14.
1$ imperative for accurate test results that the injec-
tor temperature is between 10°C and 35°C.
This test uses the fuel injector tester J 3902! and the
digital voltmeter J 39689 together. The injector
tester supplies one of three fixed amperage current
values throughout the duration of the test. Selection
of the correct supply amperage value of 4 amps is -
based on the injector .coil’s specified resistance |
16.
when the push-to-test button is depressed. The tester
energizes the injector solenoid coil for 5 seconds.
The condition of the injector solenoid coil is deter-
mined by the voltage displayed on the digital voll-
meter while the injector is energized. The voltage
reading displayed dunng the first second of the five
second test should be ignored.
15. This step checks that: the- injector control circuit |
E - (Blue 464 wire) is a complete circuit to the electron |
>. “ie control module, With the injector connected, ‘the
. If the engine is too cold or 100 hor to properly 1est
the fuel injector, the test results-would be invalid. It ©
voltage from the Pink/Blue injector wire goes
through the injector, and through the Blue #64 wire
to the electronic control module terminat “D167.
Electronic control module terminals “D9” and
“D10” are connected by a loop of wire in the har-
ness. If this loop breaks open, the injector control
circuits inside the electronic control module damage
could result. If circuit is shorted to voltage (+12
| volts); the engine will not start.
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
. mg
. a Te
Do ER
Fir Er
"ai
=
. "=
TEL
I
+
—_—
Cua
Thain
On
i Enel
TRENT
“Leen, cl #
qe.
. ной
` Е: E.
princes,
fii
FCC
EL =
Hl AE Fk
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-47
CHART A-3
a | rs To | | (Page 3 of 3)
e 1 from cuaT aa À. E В ENGINE CRANKS BUT
e ep Lao UE WILL NOT RUN
[ Fuser NIECTOR TEST TO BE PERFORMED NEXT, WITH ENGINE TEMPERATURE В 1. 7L THROTTLE BODY
BETWEEN 10°C AND 3S*CFOR ACCURATEINIECTORTEST. >.< | “INJECTION NIVA
Fa
—"
@ a IGNITION “ON”, о |
е CONNECTTECH 1. SELECT “FO: DATA UST". OBSERVE COOLANT TEMPERATURE.
—_ e 15S COOLANT TEMPERATURE BETWEEN 10°C AND 35°C?
EE | INJECTOR MUST BE TESTED AY TEMPERATURES BETWEEN 10°C AND 35°C.
; ALLOW THE E ENGINE TO WARM OR COOL AS NEEDED.
Le | « IGNITION “OFF”,
| il. Fe CONNECTFUEL INJECTOR TESTER J- 39021 POWER CASLETO VEHICLE BATTERY. SET THE TESTER ROTARY SWITCH TO THE
Cob INJECTOR COIL TEST: 4 AMP © : POSITION: |
y 4} Ce PLUG DIGITAL VOLTMETER J- 35665 TEST LEADS AE into FUELINIECTOR TESTER. SET THE DIGITAL VOLIMETERTO .
El i} | MEASURE TDCYOLTS.? 05 ;
1 1° |e DISCONNECT HARNESS CONNECTOR P FROM FUEL INJECTOR, usinG TESTER ADAPTOR + 39021-30, CONNECT FUEL INIECTOR:
| TESTER CABLE TO FUEL INJECTOR.
Lo FUELINIECTOR TESTER “LOW VEHICLE BATTERY” INDICATOR SHOULD NOT BE "ON. IS ITT
YES CHARGE VEHICLE BATTERY BEFORE PROCEEDING.
dues
e OBSERVE vou a AS PTET JESTER. “START TEST" BUTTON IS PU SHED он CE.
: 7 > ans
{INJECTOR WILL AUTO MATICALLY. BE: TESTED. FOR: 5 SECONDS. DO NOT TEST MORE OFTEN THAN ONCE PER MINUTE)
PE VOLTAGE DISPLAYED: SHOULD STAY BÉTWEENS. a AND. $. $ VOLTS DC. {DISREGARD 4 FIRST SECOND Of THE S-SECOND TEST.) -
‚DOES VOLTAGE STAY BETWEEN. 5 x AND 8.5 VOLTS? : e -
2
time TN Ny hel TIER 4 Cm eee
. DO ido . .
DL . =" . " =“. .
tb E -
. . - РЫ =" =.
AT = . E . , .
Fa : a
. Се .
FAULTY —
yves}
e DISCONNECT TESTERS, AND RECONNECT HARNESS TO FUEL INJECTOR.
DISCONNECT ELECTRONIC CONTROL MODULE CONNECTORS. ——
- e WITHA FUSED JUMPER WIRE, JUMPER THE “+” BATTERY TERMINAL TO PIN “G” OF THE DATA LINK CONNECTOR. |
- “e. BACKPROBE. ELECTRONIC CONTROL soute HARNESS CONNECTOR 70167 WITH TEST LIGHT CONNECTED TO GROUND.
а: SS TESTUGHT SON"2 E e | | ee Le
mrt TL or a = Ta ana EH . . гб.
mimi Faro PEN CIRCUIT ON (BLUE Tso CONTROL CIRCUITS WIRE, BETWEEN TC 1.
: HARNESS CONNECTOR AND ELECTRONIC CONTROL MODULE TERMINAL "DIE" IR a.
e “REMOVE FUSED JUMPER WIRE FROM DATA LINK CONNECTOR.
4° =. * USING A DIGITAL: MULTIMETER J 39689, CHECK THE RESISTANCE BETWEEN THE ELECTRONIC CONTROL MODULE HARNESS
- “CONNECT OR TERMINALS “99” AND "D0",
: RESISTANCE SHOULD BE LESS: THAN 1 OHM. A 15 IT?
pe
Se
Oh
E e . Tn
", Fo, sr . с Anew
= 4 — Гар FAULTY CONNECTIONS. OR FAULTY y ELECTRONIC CONTROL MODULE. .]
É
| 47 | REPAIR OPEN CIRCUIT IN THE WIRE LOOP, BETWEEN ELECTRONIC CONTROL | Ш
MODULE HARNESS CONNECTOR TERMINAL “09” ТО 7010”. >
VAZ SERVICE MANUAL THROTTLE BODY INJECTION ММА
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2:48 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION.
ELECTRONIC |
“2 BLACK —] FUSISLEUNK |- 3 rED
SRED — Bi BATTERY +
7 RED - 9RED ——.ACIEN BATTERY +
; |
|] ||
a 5 GRAY/RED
i I
| IGNITION y
I
SWITCH 1 INSTRUMENT
= Eee PANEL
HARNESS . 3
ENGINE BLOCK . Cu a...
GROUND CONNECTOR IGNITION RELAY
(blue connector}
76 RED | 1 —_17880WN РО и
Te 4 Ш 4 PINK
INTAKE MANIFOLD HEATER
50A | FUSE (MAXIFUSE
Located near electronic
control module)
TIRED |
| o - ENGÍNE HARESS 7
FUEL PANEL: -
Fr TO ВО instrument panel) Lo Fa EEE
J {INTAKE MANIFOLD : | | A RE
! - HEATER RELAY | | o | | - 14 PINK/BLACK |
Te 1
NY
Le
Su As -
feniToN SWITCH VOLTAGE
INPUT. SIGNAL
a 86 PINK/BLACK
15 PINK/BLACK |
I ! : о”
{ IGNITION MODULE | IGNITION MODULE | o 9-11-52.
- CONTROL MODULE | ВЕ
. . , . . . e Sa . LE
(Located under” TER A ETL TT ETE Les E
Tn TS . «a wt . . ne 2. on . E TT . . ce 2 . . Di . . : .
TE E Pe Fr Me Ne NT UAT A? DE
émis 2
bo LEE Coons]
„CHART A4 de E es E ven Siné ;
“(Page 1 ‘of2) Lo ha CE
IGNITION. RELAY AND POWER CIRCUITS CHECK dE.
pa
e UA 1.7L THROTTLE BODY INJECTION NIVA 0 й ©
“Circuit Description: . E €
When the ignition switch is tuned “ON,” it activales the ignition relay and supplies voltage to the electronic con-
trol module. The electronic control module will operate as long as voltage is applied to electronic contro! module ter-
minal “A6” ignition switch voltage i input signal during. cranking or running: The electronic control module teimbiñals |
“B1” and “CI6” receive power directly from the battery, ro: a fusible link.
— Test Description: Number(s) below: refer to Seien ie
- number(s) ( on the: diagnosticichart:= : A
1. Power i is supplied. from the battery through: а fusible :
+ link, directly to both terminals “Br” and. “C16” of VO
| the electronic control module: . | Diagnostic Aids:
2. If the ignition relay and the wiring that supplies
power to terminal “A6” are okay, the testlight ignition relay. If the ignition relay fails the intake mani-
should light. fold heater relay can be used to operate the vehicle until
3. Batery voltage should be available ai the ignition 3 replacement relay can be obtained,
- Telay's blue connector, terminat “4” and “6”, |
PO
-1wa relay. términals. 7 SA
The intake manifold heater relay is the same as the
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
G8
(Thèse: ‘are ‘gray/ret wire andthe: Redo ire itil: Es
“als: If power: is ‘available ‘at “both. чела! с: ithe +,
lestlighit should Aight” when, A о, Sg of the RE
Foren
"бт .5
Im + Se
a
EY .
ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION 2-49
0
Y eHECK THE *
* FUSE SHOWN
'ON THE DIAGRAM. IS ET
BLOWN?
de USE TEST LIGHT J 341423 WITH
CUPLEAD CONNECTED TO GROUND.
9 EACKPROBE ELECTRONIC CONTROL
MODULE CONNECTOR TERMINALS
CHART A-4
- {Page 1 of 2)
IGNITION RELAY AND POWER
CIRCUITS CHECK -
1 JL THROTTLE BODY
INJECTION NIVA
YES | SE
REPAIR SHORT IN ORCUTT
PROTECTED er FUSE"Y". -
- . : ou". .
- . BE . U
@ |
G 5 a -
. . - 1
TT о с
: is TE H
"B1” AND "C14”.
TEAMINALS.
DOESII? -
e TEST LIGHT SHOULD LIGHT ÓN BOTH
X
nr
‘ TON: ja
— WITH-TESTUGHT CUPLEAD STILL
al
TEST LIGHT SHOULD LIGHT.
DOES 177
T г : 5 '
oo, ti : - . . .
im EE Ме! " . e "eo . . НЫ
5 ae TT, Pa “A De " ET ai
. . ta . NA . .
a Te . o . AREAS
EL Ta мо ul Da .
- N : ‘ .. Mr na Ta "— . =.
So x MO . : Do
ох
со NNECTED 10 GROUND, BACKPROBE
ELECTRONIC CONTROL MODULE HARNESS CONNECT OR TERMINAL “A6.
NO
. CHECK ELECTRONIC: CONTROL
"| MODULE CONNECTIONS FOR -
OPEN CIRCUIT OR SHORT TO
GROUND IN CIRCUIT THAT DD
NOT LIGHT THE TEST LIGHT.
1
| ves
TEE Fran ETRE
—GNITION TONE en
; PROBE TERM 3
e . 5 % —.. WITH ATEST UGH Thay come
f CONTINUE TO
1
1 PAGE2 062 |
Ton ms, ms CONNECTOR, _ |
RE)AND SERIAL 5 au wen.
en To GROUND.
4 Ho TROUBLE FOUND. 1
MO LIGHT “ON ONE OR BOTH | -
REPAIR OPEN DÉ SHORTTO
GROUND IN CIRCUIT THAT DID
NOT LIGHT.
9-22-92
NS 15807
VAZ SERVICE MANUAL THROTTLE BODY INJECTION NIVA
99
2-50 ENGINE MANAGEMENT SYSTEMS 1.7L THROTTLE BODY INJECTION
ELECTRONIC
a CONTROL MODULE
he RED ——f B1 | BATTERY «
RED SRED —|CI6] BATTERY +
| = = = = = 4
! i
RE S GRAY/RED
pt IGHITION 4
| SWITCH EH INSTRUMENT
L — fe Sir dpi rer pits
fy HARNESS
ENGINE BLOCK CONNECTOR IGNITION RELAY
GROUND (blue connector)
76 RED 17 BROWN
4 4 PINK
q INTAKE MANIFOLD HEATER
SOA | FUSE (MAXIFUSE®) mr *
{Located near electronic р )
control module) - O 15A 15A 154
77 RED 7 R | Y
ENGINE HARNESS | —
FUEL PANEL RED BLACK GREEN YELLOW
_ {Located under
i TO | instrument panel) -
INTAKE MANIFOLD |
i HEATER RELAY | 14 PINK/BLACK
IGNITION SWITCH VOLTAGE
INPUT SIGNAL
865 PINK/BLACK
15 PINK/BLACK | |
A A
TO TO |
§ IGNITION MODULE | © | IGNITION MODULE | 9-11-92
NS 15181
CHARTA-4
(Page 2 of 2)
IGNITION RELAY AND POWER CIRCUITS CHECK
1.7L THROTTLE BODY INJECTION NIVA
Circuit Description:
When the ignition switch is turned “ON,” it activates the ignition relay and supplies voltage to the electronic con-
trol module. The electronic control module will operate as long as voltage is applied to electronic control module ter-
minal “A6" ignition switch voltage input signal during cranking or running. The electronic control module terminals
“B1” and “C16” receive power directly from the battery,
Test Description: Number(s) below refer 10 circled
number(s) on the diagnostic chart.
4. A previous test proved that power was available at
the relay connector, terminal “6” (Gray/Red wire).
This test will check if the Brown wire to relay ter-
minal “2” is a good ground circuit.
5. This test checks the switch portion of the relay. The
Tech 1 “Scan” tool displays “system voltage”. from
the electronic control module's interpretation of the
voltage level at terminal “A6”.
through à fusible link.
6. This checks the Pink wire, from the ignition relay
blue connector to the fuse block.
Diagnostic Aids:
The intake manifold heater relay is the same as the
ignition relay. If the ignition relay fails, the intake mani-
fold heater relay can be used to operate the vehicle until
a replacement relay can be obtained.
VAT SERVICE MANUAL THROTTLE BODY INJECTION MIVA
100
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