Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on, engine not running.
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 DTC diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK FOR THE (K71) OBD VENT VALVE DRIVER CIRCUIT SHORTED TO THE (F342) FUSED ASD RELAY OUTPUT CIRCUIT
1. Turn the ignition off.
2. Disconnect the OBD Vent Valve harness connector.
3. Disconnect the PCM C2 harness connector.
4. Check for continuity between the (K71) OBD Vent Valve Driver circuit and the (F344) Fused ASD Relay Output circuit at the OBD Vent Valve harness connector.
  Is the continuity between the (K71) OBD Vent Valve Driver circuit and the (F344) Fused ASD Relay Output circuit?
  
  Yes
  - Go To 3
  No
  - Repair the (K71) OBD Vent Valve Driver circuit for a short to the (F344) Fused ASD Relay Output circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK FOR THE (K71) OBD VENT VALVE DRIVER CIRCUIT SHORTED TO ANOTHER CIRCUIT
1. Check for continuity between the (K71) OBD Vent Valve Driver circuit and all other circuits at the PCM C2 harness connector.
  Is the continuity between the (K71) OBD Vent Valve Driver circuit and any other circuit?
  
  Yes
  - Go To 4
  No
  - Repair the (K71) OBD Vent Valve Driver circuit for a short to the circuit that showed continuity.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
REPLACE THE OBD VENT VALVE AND RETEST FOR DTCS
1. Turn the ignition off.
2. Replace the OBD Vent Valve in accordance with the Service Information.
3. Reconnect the OBD Vent Valve harness connector.
4. Reconnect the PCM C2 harness connector.
5. Turn the ignition on.
6. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replacing the OBD Vent Valve repaired the fault.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all PCM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Check for spread terminals and verify proper terminal tension.
  Repair any conditions that are found.
5. Connect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Connect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
10. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL AND INSTALLATION .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - The wiring or poor connection problem has been repaired.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .