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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: RM000000PDW057X
Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 LX570)

DTC

P0010

Camshaft Position "A" Actuator Circuit (Bank 1)

DTC

P0020

Camshaft Position "A" Actuator Circuit (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 V 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

P0010

An open or short in the Camshaft Oil Control Valve (OCV) for intake side (for Bank 1) circuit (1 trip detection logic).
  • Open or short in Camshaft Oil Control Valve (OCV) (for intake side of Bank 1) circuit
  • OCV (for intake side of Bank 1)
  • ECM

P0020

An open or short in the OCV for intake side (for Bank 2) circuit (1 trip detection logic).
  • Open or short in OCV (for intake side of Bank 2) circuit
  • OCV (for intake side of Bank 2)
  • ECM

HINT:

This DTC relates to the Camshaft Oil Control Valve (OCV).

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

P0010: VVT OCV range check (Bank 1)

P0020: VVT OCV range check (Bank 2)

Required Sensors/Components (Main)

VVT 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

VVT OCV duty ratio

3 to 100%

WIRING DIAGRAM

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 DTC

(a) Clear DTC after recording the freeze frame data and DTC 3UR-FE ENGINE CONTROL: SFI SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

(b) Turn the engine switch off.

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

(d) Check that P0010 or P0020 is not output.

OK:

P0010 or P0020 is not output.

OK

2.

INSPECT CAMSHAFT OIL CONTROL VALVE ASSEMBLY

(a) Disconnect the C24 or C25 camshaft oil control valve (OCV) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - 2

20°C (68°F)

6.9 to 7.9 Ω
OK

3.

CHECK HARNESS AND CONNECTOR (OCV - ECM)

(a) Disconnect the C24 or C25 OCV connector.

(b) Disconnect the C53 ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

C24-1 - C53-58 (OC1+)

Always

Below 1 Ω

C25-1 - C53-52 (OC2+)

Always

Below 1 Ω

C24-2 - C53-57 (OC1-)

Always

Below 1 Ω

C25-2 - C53-51 (OC2-)

Always

Below 1 Ω

C24-1 or C53-58 (OC1+) - Body ground

Always

10 kΩ or higher

C25-1 or C53-52 (OC2+) - Body ground

Always

10 kΩ or higher

C24-2 or C53-57 (OC1-) - Body ground

Always

10 kΩ or higher

C25-2 or C53-51 (OC2-) - Body ground

Always

10 kΩ or higher
OK