Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
- Ignition OFF and all vehicle systems OFF, disconnect the appropriate harness connector at the Q6 Camshaft Position Actuator Solenoid Valve. It may take up to 2 minutes for all vehicle systems to power down.
- Test for less than 5 Ω between the low reference circuit terminal 1 and ground.
- If 5 Ω or greater
- Ignition OFF.
- Disconnect the harness connector at the K20 Engine Control Module.
- Test for less than 2 Ω in the low reference circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit
- If less than 2 Ω, replace the K20 Engine Control Module
- If less than 5 Ω
- Ignition ON.
- Ignition ON.
- Verify that a test lamp does not illuminate between the control circuit terminal 2 and ground.
- If the test lamp illuminates
- Ignition OFF.
- Disconnect the harness connector at the K20 Engine Control Module.
- Ignition ON.
- Test for less than 1 V between the control circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit
- If less than 1 V, replace the K20 Engine Control Module
- If the test lamp does not illuminate
- Remove the test lamp.
- Ignition ON, command the appropriate camshaft position actuator solenoid valve from OFF to ON with a scan tool while observing the appropriate scan tool Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status. The value should toggle between OK and Not Run in each of the commanded states.
- If the parameter does not correspond to the specified values
- Ignition OFF.
- Disconnect the harness connector at the K20 Engine Control Module.
- Test for less than 2 Ω in the control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance or short to ground in the circuit
- If less than 2 Ω, replace the K20 Engine Control Module
- If the parameter corresponds to the specified values
- Remove the Q6 camshaft position actuator solenoid valve. Verify the following conditions do not exist with the Q6 Camshaft Position Actuator Solenoid Valve:
- Torn, mis-positioned, or missing screens at the CMP actuator solenoid.
- Engine oil leak between the oil sealing lands of the CMP actuator solenoid. Inspect the lands of the CMP actuator solenoid for nicks.
- Oil seepage at the CMP actuator solenoid connector
- If a condition is found.
Replace the Q6 Camshaft Position Actuator Solenoid Valve.
- If no condition is found
- Ignition OFF, swap the appropriate intake or exhaust Q6 Camshaft Position Actuator Solenoid Valve with the Q6 Camshaft Position Actuator Solenoid Valve that is operating correctly.
- Engine idling, command the appropriate Camshaft Position Actuator from 0 degrees to 20 degrees and back to zero while observing the appropriate scan tool Intake/Exhaust Camshaft Position Variance parameters. The Intake/Exhaust Camshaft Position Variance should be less than 2 degrees in each of the commanded states.
- If greater than the specified value
Replace the mechanical camshaft position actuator on the camshaft.
- If less than the specified value
- If greater than the specified value
- If all circuits/connections test normal, test or replace the Q6 Camshaft Position Actuator Solenoid Valve.
NOTE:
A test lamp must be used for this test. The control circuit is pulled-up to a low current voltage, 1.5-4.5 V on the control circuit is normal.
NOTE:
If debris is found on CMP screens, clean the screens and reinspect for damage. If the screens are not damaged, reinstall in the engine.
NOTE:
After swapping the solenoids, install jumper wires to the appropriate terminals of the harness connectors and the solenoids.