- Mechanical system (Timing belt has jumped tooth or belt stretched)
- OCV
- OCV filter
- Intake camshaft timing tube assembly
- ECM
| Last Modified: 11-29-2007 | 1.6 C | |
| Service Category: Engine/Hybrid System | Section: Engine Control | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000000PDV05JX |
| Title: 2UZ-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
DTC |
P0016 |
Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A) |
|
DTC |
P0018 |
Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor A) |
DESCRIPTION
In the VVT (Variable Valve Timing) system, the appropriate intake valve open and close timing is controlled by the ECM. The ECM performs intake valve control by performing the following: 1) controlling the camshaft and camshaft timing oil control valve, and operating the camshaft timing gear; and 2) changing the relative positions of the gaps between the camshaft and crankshaft.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0016 |
Deviation in crankshaft position sensor signal and VVT sensor 1 (for bank 1) signal (2 trip detection logic) |
|
|
P0018 |
Deviation in crankshaft position sensor signal and VVT sensor 2 (for bank 2) signal (2 trip detection logic) |
|
MONITOR DESCRIPTION
To monitor the correlation of the intake camshaft position and crankshaft position, the ECM checks the VVT learning value while the engine is idling. The VVT learning value is calibrated based on the camshaft position and crankshaft position. The intake valve timing is set to the most retarded angle while the engine is idling. If the VVT learning value is out of the specified range in consecutive driving cycles, the ECM illuminates the MIL and stores the DTC P0016 (for bank 1) or P0018 (for bank 2).
MONITOR STRATEGY
|
Related DTCs |
P0016: Camshaft timing misalignment at idling (bank 1 intake side) P0018: Camshaft timing misalignment at idling (bank 2 intake side) |
|
Required Sensors/Components |
VVT actuator |
|
Required Sensors/Components |
Camshaft position sensor, Crankshaft position sensor |
|
Frequency of Operation |
Once per driving cycle |
|
Duration |
Within 1 minute |
|
MIL Operation |
2 driving cycles |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever following DTCs not present |
P0011 (VVT System 1 - Advance) P0012 (VVT System 1 - Retard) P0021 (VVT System 2 - Advance) P0022 (VVT System 2 - Retard) P0115 - P0118 (ECT sensor) |
|
Engine RPM |
400 to 1000 rpm |
TYPICAL MALFUNCTION THRESHOLDS
|
One of following conditions met |
- |
|
VVT learning value when camshaft maximum retarded |
Less than 22.5°CA |
|
VVT learning value when camshaft maximum retarded |
More than 44°CA |
WIRING DIAGRAM
Refer to DTC P0335
.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the Techstream. 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.
PROCEDURE
|
1. |
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0016 OR P0018) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream ON.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes.
(e) Read DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
P0016 or P0018 is output |
A |
|
P0016 or P0018 and other DTCs are output |
B |
|
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV) |
HINT:
If the VVT system can be operated through the Active Test, it can be assumed that the VVT system is operating normally.
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream ON.
(d) Warm up the engine.
(e) Enter the following menus: Powertrain / Engine / Active Test / Control the VVT System (Bank 1) or Control the VVT System (Bank 2) / All Data / VVT Change Angle (Bank 1) or VVT Change Angle (Bank 2).
(f) Perform the Active Test. Check that the displacement angle varies.
OK:
Varies
|
|
3. |
CHECK VALVE TIMING
|
|
|
4. |
INSPECT CAMSHAFT OIL CONTROL VALVE ASSEMBLY
|
|
|
5. |
INSPECT OIL CONTROL VALVE FILTER
|
|
|
6. |
REPLACE CAMSHAFT TIMING TUBE ASSEMBLY |
(a) Replace the camshaft timing tube assembly
.
|
|
7. |
CONFIRM WHETHER DTC OUTPUT RECURS |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream ON.
(d) Clear the DTC
.
(e) Start the engine and warm it up.
(f) Switch the ECM from normal mode to check mode using the Techstream
.
(g) Drive the vehicle in an urban area for approximately 10 minutes.
(h) Read DTCs using the Techstream.
OK:
No DTC is output.
|
|
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