3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 Sequoia)

Last Modified: 11-29-2007		1.6 C
Service Category: Engine/Hybrid System	Section: Engine Control
Model Year: 2008	Model: Sequoia	Doc ID: RM000000PDV05IX
Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

P0016

Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)

DTC

P0017

Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor B)

DTC

P0018

Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor A)

DTC

P0019

Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor B)

DESCRIPTION

In the VVT (Variable Valve Timing) system, the appropriate intake and exhaust valve open and close timing is controlled by the ECM. The ECM performs intake and exhaust 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 camshaft and crankshaft.

DTC No.	DTC Detection Condition	Trouble Area
P0016	Deviation in crankshaft position sensor signal and VVT sensor 1 (for Intake Camshaft Bank 1) signal (2 trip detection logic)	Mechanical system (Timing chain has jumped tooth or chain stretched) ECM
P0017	Deviation in crankshaft position sensor signal and VVT sensor 1 (for Exhaust Camshaft Bank 1) signal (2 trip detection logic)	Mechanical system (Timing chain has jumped tooth or chain stretched) ECM
P0018	Deviation in crankshaft position sensor signal and VVT sensor 2 (for Intake Camshaft Bank 2) signal (2 trip detection logic)	Mechanical system (Timing chain has jumped tooth or chain stretched) ECM
P0019	Deviation in crankshaft position sensor signal and VVT sensor 2 (for Exhaust Camshaft Bank 2) signal (2 trip detection logic)	Mechanical system (Timing chain has jumped tooth or chain stretched) ECM

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 (Bank 1) or P0018 (Bank 2).

To monitor the correlation of the exhaust 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 exhaust valve timing is set to the most advanced 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 P0017 (Bank 1) or P0019 (Bank 2).

MONITOR STRATEGY

Related DTCs	P0016: Camshaft timing misalignment at idling (Bank 1 Intake Side) P0017: Camshaft timing misalignment at idling (Bank 1 Exhaust Side) P0018: Camshaft timing misalignment at idling (Bank 2 Intake Side) P0019: Camshaft timing misalignment at idling (Bank 2 Exhaust 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 - advanced) P0012 (VVT system 1 - retarded) P0021 (VVT system 2 - advanced) P0022 (VVT system 2 - retarded) P0115 - P0118 (ECT sensor)
VVT feedback mode	Executing
VVT	Maximum advanced or retarded position
Engine RPM	400 to 1400 rpm

TYPICAL MALFUNCTION THRESHOLDS

Intake Side

One of following conditions met	-
VVT learning value when camshaft maximum retarded	Less than 22.23°CA
VVT learning value when camshaft maximum retarded	More than 46.68°CA

Exhaust Side

One of following conditions met	-
VVT learning value when camshaft maximum retarded	Less than 82.23°CA
VVT learning value when camshaft maximum retarded	More than 106.68°CA

WIRING DIAGRAM

Refer to DTC P0335 .

Refer to DTC P0340 .

Refer to DTC P0365 .

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, P0017, P0018 OR P0019)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(e) Read DTCs.

Result

Result	Proceed to
P0016, P0017, P0018 or P0019 is output	A
P0016, P0017, P0018 or P0019 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.

(d) Warm up the engine.

(e) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT Linear (Bank 1) or Control the VVT Linear (Bank 2) or Control the VVT Exhaust Linear (Bank 1) or Control the Exhaust VVT Linear (Bank 2) / All Data / VVT Change Angle (Bank 1), VVT Change Angle (Bank 2), VVT Ex Chg Angle (Bank 1), VVT Ex Chg Angle (Bank 2).

(f) Perform the Active Test. Check that the displacement angle varies.

OK:

Varies

3.	ADJUST VALVE TIMING

(a) Adjust the valve timing .

4.	INSPECT CAMSHAFT OIL CONTROL VALVE ASSEMBLY

5.	REPLACE CAMSHAFT TIMING GEAR

(a) Replace the camshaft timing gear .

6.	CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to 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.