Troubleshooting

DTC P0021 CAMSHAFT POSITION "A" -TIMING OVER-ADVANCED OR SYSTEM PERFORMANCE (BANK 2)


CIRCUIT DESCRIPTION

DTC Detection Condition:

The VVT system controls the intake camshaft to provide the optimal valve timing for every driving condition. This control is performed based on the signals, such conditions as intake air volume, throttle position and engine coolant temperature.

The ECM controls the oil control valve (OCV), based on the signals output from the sensors. The VVT controller regulates the intake camshaft angle using oil pressure through the OCV. As result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, exhaust emissions decrease under overall driving conditions. Also, the ECM detects the actual valve timing using the signals from the camshaft position sensor and the crankshaft position sensor, and performs feedback control. This is how target valve timing is achieved by the ECM.

Wiring Diagram:

INSPECTION PROCEDURE







HINT:
- If DTC P0010 is displayed, check the left bank VVT system circuit.
- If DTC P0020 is displayed, check the right bank VVT system circuit.
- Read freeze frame data using hand-held tester or OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

Step 1 - 3:

Step 4 - 7:

Step 8 - 11:

Hand-held tester

Step 1 - 2:

Step 3 - 5:

Step 6 - 11:

OBD II scan tool (excluding hand-held tester)