Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Start the engine and allow it to idle.
  WARNING:
  When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in possible serious or fatal injury.
2. With the scan tool, read DTCs and record on the repair order.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE VVA SOLENOID 3 FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the VVA Solenoid 3 harness connector.
3. Check for continuity between ground and either terminal of the VVA Solenoid (component side).
  Is there continuity between ground and either terminal of the VVA Solenoid?
  
  Yes
  - Replace the Variable Valve Actuator Assembly in accordance with the Service Information. Refer to ASSEMBLY, VARIABLE VALVE ACTUATION, REMOVAL AND INSTALLATION . After replacing the Variable Valve Actuator Assembly, perform the "Adaptives After Block Change" procedure with the scan tool. This function should be run after a VVA Actuator has been installed to prevent a false failure by resetting the adaptive memory back to the base calibration.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .
  No
  - Go To 3
CHECK THE (N36) VVA SOLENOID 3 SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Disconnect the PCM C2 harness connector.
2. Check for continuity between ground and the (N36) VVA Solenoid 3 Signal circuit at the VVA Solenoid 3 harness connector.
  Is there continuity between ground and the (N36) VVA Solenoid 3 Signal circuit?
  
  Yes
  - Repair the (N36) VVA Solenoid 3 Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .
  No
  - Go To 4
CHECK THE (N37) VVA SOLENOID 3 RETURN CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (N37) VVA Solenoid 3 Return circuit at the VVA Solenoid 3 harness connector.
  Is there continuity between ground and the (N37) VVA Solenoid 3 Return circuit?
  
  Yes
  - Repair the short to ground in the (N37) VVA Solenoid 3 Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .
  No
  - Go To 5
CHECK THE POWERTRAIN CONTROL MODULE (PCM) FOR PROPER OPERATION
NOTE:
The ignition must be off during this test step. Verify that the ignition is off.
1. Check for continuity of the PCM driver across the terminals of the (N36) VVA Solenoid 3 Signal circuit and the (N37) VVA Solenoid 3 Return circuit at the PCM C2 connector (module side).
  NOTE:
  The normal resistance across the driver circuits in the PCM should be approximately 15k Ohms.
  
  Is the resistance between approximately 14k and 16k Ohms?
  
  Yes
  - The likely cause is an intermittent short to ground. Check for any chafed, pierced, pinched or partially broken wires between the VVA Solenoid and PCM. Check for and perform any Service Bulletins that may apply.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .
  No
  - Replace and program the Powertrain Control Module in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL AND INSTALLATION .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .