Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM
PERFORM ACTIVE TEST BY CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV)
INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV FOR INTAKE CAMSHAFT)
DTC P0010 Camshaft Position "A" Actuator Circuit (Bank 1)
DTC P0020 Camshaft Position "A" Actuator Circuit (Bank 2)
DESCRIPTION
The Variable Valve Timing (VVT) system includes the ECM, Oil Control Valve (OCV) and VVT controller. The ECM sends a target duty-cycle control signal to the OCV. This control signal regulates the oil pressure supplied to the VVT controller. Camshaft timing control is performed according to engine operating conditions such as intake air volume, throttle valve position and engine coolant temperature. The ECM controls the OCV, based on the signals transmitted by several sensors. The VVT controller regulates the intake camshaft angle using oil pressure through the OCV. As a result, the relative positions of the camshaft and crankshaft are optimized, the engine torque and fuel economy improves, and the exhaust emissions decrease under overall driving conditions. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control. This is how the target intake valve timing is verified by the ECM.
| DTC No. | DTC Detection Condition | Trouble Area |
| P0010 | Open or short OCV for intake camshaft (bank 1) circuit (1 trip detection logic) | Open or short OCV for intake camshaft (bank 1) circuit OCV for intake camshaft (bank 1) ECM |
| P0020 | Open or short OCV for intake camshaft (bank 2) circuit (1 trip detection logic) | Open or short OCV for intake camshaft (bank 2) circuit OCV for intake camshaft (bank 2) ECM |
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
| 1.PERFORM ACTIVE TEST BY CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV) |
Connect the intelligent tester to the DLC3.
Start the engine and turn the tester ON.
Warm up the engine.
On the tester, enter the following menus: Power train / Engine / Active Test / Activate the VVT System (Bank 1) or Control the VVT System (Bank 2).
Check the engine speed while operating the Oil Control Valve (OCV) using the tester.
- OK:
Tester Operation Specified Condition OCV OFF Normal engine speed OCV ON Engine idles roughly or stalls (soon after OCV switched from OFF to ON)
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| NG | |
| 2.INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV FOR INTAKE CAMSHAFT) |
Disconnect the E18 or E11 OCV connector.
While idling, check the waveform between the terminals of the E18 or E11 OCV connector using an oscilloscope.
- Standard:
Tester Connection Specified Condition E18-1 (+) - E18-2 (-) Correct waveform is as shown E11-1 (+) - E11-2 (-) Correct waveform is as shown
Reconnect the OCV connector.
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| NG | |
| 3.INSPECT ECM (OCV SIGNAL) |
Inspect the ECM using an oscilloscope.
While idling, check the waveform between the terminals of the E3 or E5 OCV connector using an oscilloscope.
- Standard:
Tester Connection Specified Condition OC1+ (E3-34) - OC1- (E3-33) Correct waveform is as shown OC2+ (E5-9) - OC2- (E5-8) Correct waveform is as shown
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| OK | ||
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