DTC Troubleshooting
DTC P0134: Rear A/F Sensor (Bank 1, Sensor 1) Heater System MalfunctionDTC P0154: Front A/F Sensor (Bank 2, Sensor 1) Heater System Malfunction
NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
- If DTC P2251 and/or P2254* is stored at the same time as DTC P0134 and/or P0154*, troubleshoot DTC P2251 and/or P2254* first, then recheck for P0134 and/or P0154*.
- Information marked with an asterisk (*) applies to the front bank (Bank 2).
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle for 2 minutes.
4. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0134 and/or P0154* 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 OFF.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 8P connector.
8. Disconnect ECM/PCM connector B (24P).
9. Connect A/F sensor (Sensor 1) 8P connector terminal No. 6 to body ground with a jumper wire.
10. Check for continuity between ECM/PCM connector terminal B12 (B20)* and body ground.
Is there continuity?
YES - Go to step 11.
NO - Repair open in the wire between the ECM/PCM (B12 (B20)*) and the A/F sensor (Sensor 1), then go to step 15.
11. Remove the jumper wire from the A/F sensor (Sensor 1) 8P connector, then reconnect ECM/PCM connector B (24P).
12. Start the engine, and let it idle for 2 minutes.
13. Measure voltage between ECM/PCM connector terminals B12 (B20)* and C12.
Is there about 0.2 V or less?
YES - Go to step 21.
NO - Go to step 14.
14. Replace the A/F sensor.
15. Reconnect all connectors.
16. Turn the ignition switch ON (II).
17. Reset the ECM/PCM with the HDS.
18. Do the ECM/PCM idle learn procedure.
19. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0134 and/or P0154* 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.
NO - Go to step 20.
20. Monitor the OBD STATUS for DTC P0134 and/or P0154* in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 19, go to the indicated DTCs troubleshooting.
NO - If the screen 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 screen indicates NOT COMPLETED, keep idling until a result comes on.
21. Turn the ignition switch OFF.
22. Reconnect all connectors.
23. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
24. Start the engine, and let it idle 2 minutes.
25. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0134 and/or P0154* indicated?
YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 24. If the ECM/PCM was substituted, go to step 1.
NO - Go to step 26.
26. Monitor the OBD STATUS for DTC P0134 and/or P0154* in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. If any other Temporary DTCs or DTCs were indicated in step 25, go to the indicated DTCs troubleshooting.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 24. If the ECM/PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.