DTC Troubleshooting
DTC Troubleshooting: P2238, P2238
DTC P2238:
A/F Sensor (Sensor 1) AFS+ Line Low Voltage
NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
- Information marked with an asterisk (*1) applies to '09-10 models and '11-12 models (M/T).
- Information marked with an asterisk (*2) applies to '11-12 models (A/T).
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until radiator fan comes on.
4. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2238 indicated?
YES -
Go to step 5.
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM.
5. Turn the ignition switch to LOCK (0).
6. Jump the SCS line with the HDS.
7. Remove the under-cowl panel Service and Repair.
8. Disconnect the A/F sensor (Sensor 1) 4P connector.
9. Disconnect ECM/PCM connector C (49P).
10. Check for continuity between ECM/PCM connector terminal C29 and body ground.
Is there continuity?
YES -
Repair a short in the wire between the ECM/PCM (C29) and the A/F sensor (Sensor 1), then go to step 12.
NO -
Go to step 11.
11. Replace the A/F sensor (Sensor 1) A/F Sensor Replacement.
12. Reconnect all connectors.
13. Turn the ignition switch to ON (II).
14. Reset the ECM/PCM with the HDS.
15. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure.
16. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2238 indicated?
YES -
Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1. If the connections and the terminals are OK, go to step 18.
NO -
Go to step 17.
17. Monitor the OBD STATUS for DTC P2238 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 16, go to the indicated DTC's troubleshooting.
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
18. Update the ECM/PCM if it does not have the latest software ECM/PCM Update, or substitute a known-good ECM/PCM.
19. Start the engine, and let it idle.
20. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2238 indicated?
YES -
If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 19. If the ECM/PCM was substituted, go to step 1.
NO -
Go to step 21.
21. Monitor the OBD STATUS for DTC P2238 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM Service and Repair. If any other Pending or Confirmed DTCs were indicated in step 20, go to the indicated DTC's troubleshooting.
NO -
If the HDS indicates FAILED, go to step 1. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 19. If the ECM/PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, keep idling until a result come on.