3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 LX570)

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Last Modified: 11-27-2007		1.6 C
Service Category: Engine/Hybrid System	Section: Engine Control
Model Year: 2008	Model: LX570	Doc ID: RM000000PDV05DX
Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 LX570)

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 Code	DTC Detection Condition	Trouble Area
P0016	Deviation in the crankshaft position sensor signal and VVT sensor (for Intake side of Bank 1) signal (2 trip detection logic).	Mechanical system (Timing chain has jumped tooth or chain stretched) Camshaft oil control valve (OCV) (for intake side of bank 1) Camshaft timing gear assembly ECM
P0017	Deviation in the crankshaft position sensor signal and VVT sensor (for Exhaust side of Bank 1) signal (2 trip detection logic).	Mechanical system (Timing chain has jumped tooth or chain stretched) OCV (for exhaust side of bank 1) Camshaft timing exhaust gear assembly ECM
P0018	Deviation in the crankshaft position sensor signal and VVT sensor (for Intake side of Bank 2) signal (2 trip detection logic).	Mechanical system (Timing chain has jumped tooth or chain stretched) OCV (for intake side of bank 2) Camshaft timing gear assembly ECM
P0019	Deviation in the crankshaft position sensor signal and VVT sensor (for Exhaust side of Bank 2) signal (2 trip detection logic).	Mechanical system (Timing chain has jumped tooth or chain stretched) OCV (for exhaust side of bank 2) Camshaft timing exhaust gear assembly (bank 2) 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 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 DTC P0017 (Bank 1) or P0019 (Bank 2).

MONITOR STRATEGY

Related DTCs	P0016: Camshaft timing misalignment at idling (for Intake Side of Bank 1) P0017: Camshaft timing misalignment at idling (for Exhaust Side of Bank 1) P0018: Camshaft timing misalignment at idling (for Intake Side of Bank 2) P0019: Camshaft timing misalignment at idling (for Exhaust Side of Bank 2)
Required Sensors/Components (Main)	VVT actuator
Required Sensors/Components (Related)	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 stored	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 speed	400 to 1,400 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	Less than 82.23° CA
VVT learning value	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 engine switch on (IG) and turn the Techstream on.

(d) 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)

(a) Connect the Techstream to the DLC3.

(b) Start the engine and turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1) or Control the VVT System (Bank 2).

(e) Check the engine speed while operating the Camshaft Oil Control Valve (OCV) using the Techstream.

OK:

Operation	Specified Condition
OCV OFF	Normal engine speed
OCV ON	Soon after OCV switched from OFF to ON, engine idles roughly or stalls

3.	ADJUST VALVE TIMING

(a) Adjust the valve timing .

4.	INSPECT CAMSHAFT OIL CONTROL VALVE (FOR INTAKE SIDE OR EXHAUST SIDE)

5.	REPLACE CAMSHAFT TIMING GEAR OR CAMSHAFT TIMING EXHAUST GEAR

(a) Replace the camshaft timing gear .

(b) Replace the camshaft timing exhaust gear.

6.	CONFIRM WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(d) Start the engine and warm it up.

(e) Switch the ECM from normal mode to check mode using the Techstream .

(f) Drive the vehicle in an urban area for approximately 10 minutes.

(g) Read DTCs using the Techstream.

OK:

No DTC is output.