Warning! Read This!
Updated Instructions
SYSTEM WIRING DIAGRAMS
Charging Circuit
Typical 1988/91 Honda Civic/CRX
Application: 1988/91 Honda Civic, CRX 1488cc, 1600cc engine
Service Bulletins: Important Acura factory service bulletins relating to your charging
system.
Bulletin No.: 88-023 Battery Test Procedure
88-031 Repeated Battery Failure - Low Charge Rate Fix (1988 only)
92-001 Charging System Testing - Revised Procedures
HSN392-01 - Parasitic Test Info
HSN685-01 Normal Battery Draw Specifications
Important Information
The alternators on these vehicles are controlled by the
Electronic Control Unit (ECU) in conjunction with the Electric
Load Detector (ELD). Charging rates may vary depending on engine
load, speed and temperature as well as alternator loads.
WARNING !
These units do not charge under certain conditions. The charge warning light will be off but the system voltage will be set at 12.5Vdc. To
override this function STEP ON THE BRAKE. This will activate the
alternator control circuits and allow the alternator to charge.
PI0036/Page 1 of 4/v1.0
(c) 1998 MRIC and Snap-on Tools Co.
5. Attach test light to White/Blue wire
Troubleshooting: 1988/91 Honda Civic, Civic CRX
with key on and engine off
The following steps will help you troubleshoot your charging system.
1. Key and Engine off.
2. Unplug harness from alternator.
Test Light ON
SYSTEM OK
Test Light OFF
***REPAIR***
a. Check fuse #14 in dash fuse box.
b. Check Wht/Blu wire from alternator to charge
warning light.
c. Check Blk/Yel wire from dash fuse box to charge
warning light.
6. Attach test light to Black/Yellow wire
3.
Turn the key on do not
start the engine.
4. Check instrument panel
with key on and engine off
charge warning light.
Key On and
Engine Off.
Charge Light OFF
SYSTEM OK
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Charge Light ON
***REPAIR***
White/Blue wire is
grounded.
Test Light ON
SYSTEM OK
Test Light OFF
***REPAIR***
a. Check fuse #14 in dash fuse box.
b. Check Blk/Yel wire from dash fuse
box to alternator harness plug.
7.
10. Check for voltage on voltmeter.
Check alternator B+ harness. Key ON Engine
OFF. Harness attached to alternator.
Test Light ON
SYSTEM OK
Test Light OFF
***REPAIR***
a.Check fuse #31 in underhood fuse box.
b.Check White wire from alternator to
underhood fuse box.
8. Connect voltmeter positive (+) lead to
battery and negative (-) lead to alternator “C”
terminal (White/yellow) wire.
9.
Start the engine, turn all
accessories off.
Volts on Meter
SYSTEM OK
NO Volts on meter
***REPAIR***
a. Check for an open in Blue wire from
alternator plug to Electronic Control Unit.
11. Turn headlights on
12. Check for voltage on voltmeter.
low beams.
Set voltmeter to
Vdc
“C” white/yellow
Start the
Engine
Headlights ON LOW
(+) positive
“ C” (White/Yellow)
NO Volts on Meter
SYSTEM OK
All accessories off
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Volts on meter
***REPAIR***
a. Check for short to ground in
Blue wire between alternator
plug and Electronic Control
Unit.
Electric Load Detector Test
(1988/89 Acura Integra)
1. Locate Electric Load Detec-
2. Disconnect 3-pin
tor (ELD) in underhood fuse
box (located in engine compartment).
connector from ELD.
3. Turn Ignition
Switch ON.
CAUTION: Never disconnect battery while motor is running!
ELD
Main Fuse
Box
VOLTAGE DROP TEST: Perform this test under full load (all lights, fan, A/C,
etc. on) with engine running at 2000rpm. Reading on voltmeter should be less
than .2 volts.
4. Check for voltage between Black/
5. Check for 2Vdc between Green/Red
Yellow wire and Black wire on harness
connector.
wire
GROUND CIRCUIT TEST: Perform this test under full load (all lights, fan, A/C,
etc. on) with engine running at 2000rpm. Reading on voltmeter should be less
than .2 volts.
Battery Voltage
SYSTEM OK
No Battery Voltage
*** REPAIR***
a. Check fuse #14 in dash fuse box.
b. Check for an open in BLK/Yel
wire between underhood fuse box
and dash fuse box.
c. Poor ground at right kick panel
under the dash.
d. Open in Black wire from ground
connection to main fuse box.
PI0036/Page 4 of 4/v1.0
Voltage 2 Vdc
SYSTEM OK
NO Voltage or incorrect voltage
***REPAIR***
a. Repair or replace ELD
CURRENT DRAIN TEST: With all accessories turned off and/or disconnected,
test light should not glow.
LIABILITY DISCLAIMER: The information contained in this document is based
upon data which we believe to be correct. We assume no liability for errors or
omissions herein. Furthermore, we assume the person or persons using this
information to be knowledgeable of safety precautions involved with working on a
vehicle's electrical system. We assume no liability for damage, either to the
vehicle or the person working on the vehicle, that may occur while following the
iinstructions in this document.