DTC P0011 Camshaft Position "A" - Timing Over

ES–73
2AZ-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
DTC
P0011
Camshaft Position "A" - Timing Over-Advanced
or System Performance (Bank 1)
DTC
P0012
Camshaft Position "A" - Timing Over-Retarded
(Bank 1)
DESCRIPTION
The VVT system includes the ECM, Oil Control Valve (OCV) and VVT controller. The ECM sends a target
duty-cycle control signal to the OCV. This control signal regulates the oil pressure supplied to the VVT
controller. Camshaft timing control is performed according to engine operating conditions such as the
intake air volume, throttle valve position and engine coolant temperature. The ECM controls the OCV,
based on the signals transmitted by several sensors. The VVT controller regulates the intake camshaft
angle using oil pressure through the OCV. As a result, the relative positions of the camshaft and
crankshaft are optimized, the engine torque and fuel economy improve, and the exhaust emissions
decrease under overall driving conditions. The ECM detects the actual intake valve timing using signals
from the camshaft and crankshaft position sensors, and performs feedback control. This is how the target
intake valve timing is verified by the ECM.
ECM
Crankshaft Position Sensor
MAF Meter
Duty Control
Target Valve Timing
Throttle Position Sensor
Feedback
ECT Sensor
Correction
Camshaft Timing
Oil Control Valve
(OCV)
Vehicle Speed Signal
Actual Valve Timing
Camshaft Position Sensor
A103843E08
ES
ES–74
ES
2AZ-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
DTC No.
DTC Detection Conditions
Trouble Areas
P0011
Advanced camshaft timing:
With warm engine and engine speed of between 550 rpm and
4,000 rpm, all conditions (1), (2) and (3) met (1 trip detection
logic):
1. Difference between target and actual intake valve timings
more than 5°CA (Crankshaft Angle) for 4.5 seconds
2. Current intake valve timing fixed (timing changes less than
5°CA in 5 seconds)
3. Variations in VVT controller timing more than 19°CA of
maximum delayed timing (malfunction in advance timing)
•
•
•
•
•
Valve timing
OCV
OCV filter
Camshaft timing gear assembly
ECM
P0012
Retarded camshaft timing:
With warm engine and engine speed of between 550 rpm and
4,000 rpm, all conditions (1), (2) and (3) met (2 trip detection
logic):
1. Difference between target and actual intake valve timings
more than 5°CA (Crankshaft Angle) for 4.5 seconds
2. Current intake valve timing fixed (timing changes less than
5°CA in 5 seconds)
3. Variations in VVT controller timing 19°CA or less of
maximum delayed timing (malfunction in retarded timing)
•
•
•
•
•
Valve timing
OCV
OCV filter
Camshaft timing gear assembly
ECM
MONITOR DESCRIPTION
The ECM optimizes the intake valve timing using the VVT (Variable Valve Timing) system to control the
intake camshaft. The VVT system includes the ECM, the Oil Control Valve (OCV) and the VVT controller.
The ECM sends a target duty-cycle control signal to the OCV. This control signal regulates the oil
pressure supplied to the VVT controller. The VVT controller can advance or retard the intake camshaft.
If the difference between the target and actual intake valve timings is large, and changes in the actual
intake valve timing are small, the ECM interprets this as the VVT controller stuck malfunction and sets a
DTC.
Example:
A DTC is set when the following conditions 1, 2 and 3 are met:
1. The difference between the target and actual intake valve timing is more than 5°CA (Crankshaft
Angle) and the condition continues for more than 4.5 seconds.
2. It takes 5 seconds or more to change the valve timing by 5°CA.
3. After above conditions 1 and 2 are met, the OCV is forcibly activated 63 times or more.
DTC P0011 (Advanced Cam Timing) is subject to 1 trip detection logic.
DTC P0012 (Retarded Cam Timing) is subject to 2 trip detection logic.
These DTCs indicate that the VVT controller cannot operate properly due to OCV malfunctions or the
presence of foreign objects in the OCV.
The monitor will run if all of the following conditions are met:
– The engine is warm (the engine coolant temperature is 75°C [167°F] or more).
– The vehicle has been driven at more than 64 km/h (40 mph) for 3 minutes.
– The engine has idled for 3 minutes.
MONITOR STRATEGY
Related DTCs
P0011: Advanced camshaft timing
P0012: Retarded camshaft timing
Required Sensors/Components (Main)
VVT OCV and VVT Actuator
Required Sensors/Components (Related)
Crankshaft position sensor, camshaft position sensor and Engine
coolant temperature sensor
Frequency of Operation
Once per driving cycle
Duration
Within 10 seconds
MIL Operation
Advanced camshaft timing: Immediate
Retarded camshaft timing: 2 driving cycles
Sequence of Operation
None
2AZ-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
ES–75
TYPICAL ENABLING CONDITIONS
Monitor runs whenever following DTCs not present
P0100 - P0103 (MAF meter)
P0115 - P0118 (ECT sensor)
P0125 (Insufficient ECT for closed loop)
P0335 (CKP sensor)
P0340 (CMP sensor)
P0351 - P0354 (Igniter)
Battery voltage
11 V or more
Engine RPM
550 to 4,000 rpm
ECT
75°C (167°F) to 100°C (212°F)
TYPICAL MALFUNCTION THRESHOLDS
ES
Advanced camshaft timing:
All of following conditions met
-
Crank angle between reference position and actual intake camshaft
angle
67°CA or more
Valve timing
No change at advanced valve timing
Retard camshaft timing:
All of following conditions met
-
Crank angle between reference point and actual intake camshaft
angle
Less than 67°CA
Valve timing
No change at retarded valve timing
If the difference between the target and actual camshaft timings is greater than the specified value, the
ECM operates the VVT actuator.
Then, the ECM monitors the camshaft timing change for 5 seconds.
WIRING DIAGRAM
Refer to DTC P0010 (see page ES-64).
INSPECTION PROCEDURE
NOTICE:
DTC P0011 or P0012 may be set when foreign objects in the engine oil are caught in some parts of
the system. The DTC will remain set even if the system returns to normal after a short time.
Foreign objects are filtered out by the oil filter.
HINT:
If DTC P0011 or P0012 is present, check the VVT (Variable Valve Timing) system.
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other
data from the time the malfunction occurred.
1
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0011 OR P0012)
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch ON and turn the tester ON.
(c) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II / DTC INFO / CURRENT CODES.
(d) Read DTCs.
Result
Display (DTC Output)
Proceed To
ES–76
2AZ-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
P0011 or P0012
A
P0011 or P0012 and other DTCs
B
HINT:
If any DTCs other than P0011 or P0012 are output,
troubleshoot those DTCs first.
B
GO TO DTC CHART
A
2
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE OCV)
ES
(a)
(b)
(c)
(d)
Connect the intelligent tester to the DLC3.
Start the engine and turn the tester ON.
Warm up the engine.
On the tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST /
VVT CTRL B1.
(e) Check the engine speed while operating the Oil Control
Valve (OCV) using the tester.
OK
Tester Operations
Specified Conditions
OCV OFF
Normal engine speed
OCV ON
Engine idles roughly or stalls
(soon after OCV switched from OFF to ON)
NG
Go to step 4
OK
3
CHECK WHETHER DTC OUTPUT RECURS (DTC P0011 OR P0012)
(a)
(b)
(c)
(d)
(e)
Connect the intelligent tester to the DLC3.
Turn the ignition switch ON and turn the tester ON.
Clear DTCs (see page ES-35).
Start the engine and warm it up.
Switch the ECM from normal mode to check mode using
the tester.
(f) Drive the vehicle for more than 10 minutes.
(g) Read DTCs using the tester.
OK:
No DTC output.
NG
OK
END
Go to step 4
2AZ-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
4
ES–77
CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)
Paint Mark
Timing Mark
Paint Mark
Timing Mark
Groove
A098172E05
(a) Remove the cylinder head cover.
(b) Turn the crankshaft pulley, and align its groove with the
timing mark "0" on the timing chain cover.
(c) Check that the timing marks on the camshaft timing
sprocket and camshaft timing gear are facing upward as
shown in the illustration.
If not, turn the crankshaft 1 revolution (360°), then align
the marks as above.
OK:
Timing marks on camshaft timing gears are aligned
as shown in the illustration.
(d) Reinstall the cylinder head cover.
NG
ADJUST VALVE TIMING
OK
5
INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV)
Valve Moves
A097066E01
(a) Remove the OCV.
(b) Measure the resistance between the terminals of the
OCV.
Standard resistance:
6.9 to 7.9 Ω at 20°C (68°F)
(c) Apply the positive battery voltage to terminal 1 and
negative battery voltage to terminal 2. Check the valve
operation.
OK:
Valve moves quickly.
(d) Reinstall the OCV.
NG
REPLACE CAMSHAFT TIMING OIL
CONTROL VALVE ASSEMBLY
OK
6
INSPECT OIL CONTROL VALVE FILTER
(a) Remove the generator.
(b) Remove the OCV filter.
(c) Check that the filter is not clogged.
OK:
Filter is not clogged.
(d) Reinstall the OCV filter.
(e) Reinstall the generator.
OCV Filter
NG
A098169E03
CLEAN OIL CONTROL VALVE FILTER
ES
ES–78
2AZ-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
OK
7
REPLACE CAMSHAFT TIMING GEAR ASSEMBLY
NEXT
8
CHECK WHETHER DTC OUTPUT RECURS
(a)
(b)
(c)
(d)
(e)
Connect the intelligent tester to the DLC3.
Turn the ignition switch ON and turn the tester ON.
Clear DTCs (see page ES-35).
Start the engine and warm it up.
Switch the ECM from normal mode to check mode using
the tester.
(f) Drive the vehicle for more than 10 minutes.
(g) Read output DTCs using the tester.
Standard:
No DTC output.
HINT:
DTC P0011 or P0012 is output when foreign objects in
engine oil are caught in some parts of the system. These
codes will stay registered even if the system returns to
normal after a short time. These foreign objects are then
captured by the oil filter, thus eliminating the source of
the problem.
ES
OK
NG
REPLACE ECM
SYSTEM OK
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