DTC Troubleshooting
DTC Troubleshooting: P2252
DTC P2252:
A/F Sensor (Sensor 1) AFS- Circuit 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.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle.
4. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2252 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 PCM.�
5. Turn the ignition switch to LOCK (0).
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 4P connector.
8. Disconnect PCM connector C (44P).
9. Check for continuity between PCM connector terminal C30 and body ground.
Is there continuity?
YES -
Repair a short in the wire between the PCM(C30) and the A/F sensor (Sensor 1), then go to step 15.
NO -
Go to step 10.
10. Reconnect PCM connector C (44P).
11. Turn the ignition switch to ON (II).
12. Measure the voltage between PCM connector terminal C30 and body ground.
Is the voltage about 2.2 V?
YES -
Go to step 13.
NO -
Go to step 21.
13. Turn the ignition switch to LOCK (0).
14. Replace the A/F sensor. A/F Sensor Replacement
15. Reconnect all connectors.
16. Turn the ignition switch to ON (II).
17. Reset the PCM with the HDS.
18. Do the PCM idle learn procedure PCM Idle Learn Procedure.
19. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2252 indicated?
YES -
Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1. If the connector and terminal fits are OK, go to step 21.
NO -
Go to step 20.
20. Monitor the OBD STATUS for DTC P2252 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 19, 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 PCM, then go to step 1. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
21. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM Initial Inspection and Diagnostic Overview.
22. Start the engine, and let it idle.
23. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2252 indicated?
YES -
If the PCM was updated, substitute a known-good PCM Initial Inspection and Diagnostic Overview, then go to step 22. If the PCM was substituted, go to step 1.
NO -
Go to step 24.
24. Monitor the OBD STATUS for DTC P2252 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM Service and Repair. If any other Pending or Confirmed DTCs were indicated in step 23, go to the indicated DTC's troubleshooting.�
NO -
If the HDS indicates FAILED, go to step 1. If the PCM was updated, substitute a known-good PCM Initial Inspection and Diagnostic Overview, then go to step 22. If the HDS indicates NOT COMPLETED, keep idling idle until a result comes on.