P0020
DTC P0010Camshaft Position "A" Actuator Circuit (Bank 1)DTC P0020Camshaft Position "A" Actuator Circuit (Bank 2)
DESCRIPTION
DTC Detection Condition (Part 1):
DTC Detection Condition (Part 2):
This DTC is designed to detect opens or shorts in the camshaft oil control valve (OCV) circuit. If the OCV's duty-cycle is excessively high or low while the engine running, the ECM will illuminate the MIL and set 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 the 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.
MONITOR DESCRIPTION
Monitor Strategy:
Typical Enabling Conditions:
Typical Malfunctions Thresholds:
Component Operating Range:
After the ECM sends the "target" duty-cycle signal to the OCV, the ECM monitors the OCV current to establish an "actual" duty-cycle. The ECM detects a malfunction and sets a DTC when the actual duty-cycle ratio varies from the target duty-cycle ratio.
This monitor runs for 1 second (the first second of engine idle) after the engine is started.
Wiring Diagram:
Step 1:
Step 1(Continued)-3:
INSPECTION PROCEDURE
HINT:
- Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.
- If DTC P0010 is displayed, check the bank 1 VVT OCV.
- If DTC P0020 is displayed, check the bank 2 VVT OCV.
- Bank 1 includes No. 1 cylinder, but bank 2 does not. No. 1 cylinder is located in the front part of the engine, opposite the transmission.