Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read DTCs.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
INSPECT THE ACTIVE EXHAUST VALVE 1 ACTUATOR FOR SIGNS OF PHYSICAL DAMAGE
1. Inspect the Active Exhaust Valve 1 Actuator harness connector for damage due to road debris.
  Is the Active Exhaust Valve 1 Actuator or harness connector damaged or disconnected?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (A947) FUSED B+ CIRCUIT
1. Turn the ignition off.
2. Disconnect the Active Exhaust Valve 1 Actuator harness connector.
3. Measure the voltage between ground and the (A947) Fused B+ circuit at the Active Exhaust Valve 1 Actuator harness connector.
4. Is the voltage equal to battery voltage?
  
  Yes
  - Go To 4
  No
  - Repair the (A947) Fused B+ circuit for an open or short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE (Z922) GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Check for continuity between ground and the (Z922) Ground circuit at the Active Exhaust Valve 1 Actuator harness connector.
  Is there continuity between ground and the (Z922) Ground circuit?
  
  Yes
  - Go To 5
  No
  - Repair the (Z922) Ground circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE (D511) LIN BUS CIRCUIT FOR A SHORT TO GROUND
1. Disconnect the PCM C1 harness connector.
2. Check for continuity between ground and the (D511) LIN BUS circuit at the Active Exhaust Valve 1 Actuator harness connector.
  Is there continuity between ground and the (D511) LIN BUS circuit?
  
  Yes
  - Repair the (D511) LIN BUS circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6
CHECK THE (D511) LIN BUS CIRCUIT FOR AN OPEN/HIGH RESISTANCE
CAUTION:
Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the GPEC Diagnostic Adaptor to perform the diagnosis.
1. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
2. Measure the resistance of the (D511) LIN BUS circuit between the Active Exhaust Valve 1 Actuator harness connector and the GPEC Adaptor.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 7
  No
  - Repair the (D511) LIN BUS circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
ACTIVE EXHAUST VALVE 1 ACTUATOR
1. Replace the Active Exhaust Valve 1 Actuator in accordance with the Service Information.
2. Reconnect the PCM C1 harness connector.
3. Turn the ignition on.
4. With the scan tool, erase DTCs.
5. Start the engine and allow it to idle for a minimum of one minute.
6. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 8
  No
  - Repair complete.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Active Exhaust Valve 1 Actuator and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Perform any Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .