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: RM000000XH702XX
Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 LX570)

DTC

P0013

Camshaft Position "B" Actuator Circuit / Open (Bank 1)

DTC

P0023

Camshaft Position "B" Actuator Circuit / Open (Bank 2)

DESCRIPTION

This DTC is designed to detect opens or shorts in the Camshaft Oil Control Valve (OCV) circuit. If the OCV duty-cycle is excessively high or low while the engine is running, the ECM will illuminate the MIL and store the DTC.
The VVT (variable valve timing) system adjusts the intake valve timing to improve the driveability. The engine oil pressure turns the camshaft actuator to adjust the valve timing. The OCV is a solenoid valve and switches the engine oil line. The valve moves when the ECM applies 12 volts to the solenoid. The ECM changes the energizing time to the solenoid (duty-cycle) in accordance with the camshaft position, crankshaft position, throttle position, etc.

DTC Code	DTC Detection Condition	Trouble Area
P0013	An open or short in the Camshaft Oil Control Valve (OCV) for exhaust side (for Bank 1) circuit (1 trip detection logic).	Open or short in Camshaft Oil Control Valve (OCV) (for exhaust side of Bank 1) circuit OCV (for exhaust side of Bank 1) ECM
P0023	An open or short in the OCV for exhaust side (for Bank 2) circuit (1 trip detection logic).	Open or short in OCV (for exhaust side of Bank 2) circuit OCV (for exhaust side of Bank 2) ECM

MONITOR DESCRIPTION

This DTC is designed to detect opens or shorts in the camshaft oil control valve (OCV) circuit. If the OCV duty-cycle is excessively high or low while the engine is running, the ECM will illuminate the MIL and store the DTC.

MONITOR STRATEGY

Related DTCs	P0013: Exhaust camshaft OCV (for Bank 1) P0023: Exhaust camshaft OCV (for Bank 2)
Required sensors/Components (Main)	Exhaust camshaft OCV
Required sensors/Components (Related)	-
Frequency of operation	Continuous
Duration	1 second
MIL operation	Immediate
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs not stored	None
All of following conditions met	-
Starter	Off
Engine switch	On (IG)
Time after engine switch off to on (IG)	0.5 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

One of following conditions met	-
A. All of following conditions met	-
Battery voltage	11 to 13 V
Target duty ratio	Less than 70%
Output signal duty ratio	100%
B. All of following conditions met	-
Battery voltage	13 V or higher
Target duty ratio	Less than 80%
Output signal duty ratio	100%
C. Both of following conditions met	-
Current cut status	Not cut
Output signal duty ratio	3% or less

COMPONENT OPERATING RANGE

OCV duty-cycle

4 to 100% when engine running

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

If DTC P0013 is output, check the bank 1 VVT system for exhaust side circuit.
Bank 1 refers to the bank that includes the No. 1 cylinder.
If DTC P0023 is output, check the bank 2 VVT system for exhaust side circuit.
Bank 2 refers to the bank that does not include the No. 1 cylinder.
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 DTC (DTC P0013 OR P0023)

(a) Connect the Techstream to the DLC3.

(b) Clear DTC after recording the freeze frame data and DTC.

(d) Allow the engine to idle and check DTC.

(e) Check that P0013 or P0023 is not output.

OK:

P0013 or P0023 is not output.

2.	INSPECT CAMSHAFT OIL CONTROL VALVE ASSEMBLY

(a) Disconnect the C26 or C27 OCV connector.

(b) Remove the camshaft oil control valve (OCV) .

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	20°C (68°F)	6.9 to 7.9 Ω

3.	CHECK HARNESS AND CONNECTOR (OCV - ECM)

(a) Disconnect the C26 or C27 OCV connector.

(b) Disconnect the C53 ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C26-1 - C53-56 (OE1+)	Always	Below 1 Ω
C26-2 - C53-55 (OE1-)	Always	Below 1 Ω
C27-1 - C53-50 (OE2+)	Always	Below 1 Ω
C27-2 - C53-49 (OE2-)	Always	Below 1 Ω
C26-1 or C53-56 (OE1+) - Body ground	Always	10 kΩ or higher
C26-2 or C53-55 (OE1-) - Body ground	Always	10 kΩ or higher
C27-1 or C53-50 (OE2+) - Body ground	Always	10 kΩ or higher
C27-2 or C53-49 (OE2-) - Body ground	Always	10 kΩ or higher