DTC Troubleshooting

DTC Troubleshooting: P0134

DTC P0134: A/F Sensor (Sensor 1) Heater System Malfunction

NOTE:

- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Initial Inspection and Diagnostic Overview

- If DTC P0135 is stored at the same time as DTC P0134, troubleshoot DTC P0135 first, then recheck for DTC P0134.

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 (in neutral) until the radiator fan comes on, then let it idle.

4. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0134 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), the A/F sensor relay (LAF), and the ECM.


5. Turn the ignition switch to LOCK (0).

6. Replace the A/F sensor (Sensor 1). A/F Sensor Replacement

7. Turn the ignition switch to ON (II).

8. Reset the ECM with the HDS.

9. Do the ECM idle learn procedure. ECM Idle Learn Procedure

10. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0134 indicated?
YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay (LAF), and the ECM, then go to step 1.

NO - Go to step 11.


11. Monitor the OBD STATUS for DTC P0134 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 10, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay (LAF), and the ECM, then go to step 1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.