Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM
PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE OCV)
INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV SIGNAL)
DTC P0013 Camshaft Position "B" Actuator Circuit / Open (Bank 1)
DTC P0023 Camshaft Position "B" Actuator Circuit / Open (Bank 2)
DESCRIPTION
The Variable Valve Timing (VVT) system includes the ECM, 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 the 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 exhaust 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 improve, and the exhaust emissions decrease under overall driving conditions. The ECM detects the actual exhaust 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 |
| P0013 | Open or short in OCV for exhaust camshaft (bank 1) circuit (1 trip detection logic) | Open or short in OCV for exhaust camshaft (bank 1) circuit OCV for exhaust camshaft (bank 1) ECM |
| P0023 | Open or short in OCV for exhaust camshaft (bank 2) circuit (1 trip detection logic) | Open or short in OCV for exhaust camshaft (bank 2) circuit OCV for exhaust camshaft (bank 2) ECM |
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
| 1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE OCV) |
Connect the intelligent tester to the DLC3.
Start the engine and turn the tester ON.
Warm up the engine.
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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| OK | ||
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| 2.INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV SIGNAL) |
Disconnect the E21 or E31 OCV connector.
While idling, check the waveform between the terminals of the E21 or E31 OCV connector using an oscilloscope.
- Standard:
Tester Connection Specified Condition E21-1 (+) - E21-2 (-) Correct waveform shown E31-1 (+) - E31-2 (-) Correct waveform shown
Reconnect the OCV connector.
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| OK | ||
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| 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.
- Standard:
Tester Connection Specified Condition OE1+ (E3-9) - OE1- (E3-8) Correct waveform shown OE2+ (E5-24) - OE2- (E5-23) Correct waveform shown
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| OK | ||
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