DTC Troubleshooting

DTC Troubleshooting: P1172, P1174, P1172, P1174

DTC P1172:

Rear A/F Sensor (Bank 1, Sensor 1) Circuit Out of Range High

DTC P1174:

Front A/F Sensor (Bank 2, Sensor 1) Circuit Out of Range High

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 (*) applies to the front bank (Bank 2).

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

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 the radiator fan comes on, then let it idle.

4. Monitor the OBD STATUS for P1172 and/or P1174* in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES -

Go to step 5.

NO -

If the screen indicates PASSED, 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. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 and recheck.

5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

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

7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

8. Reset the ECM/PCM with the HDS.

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

10. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

11. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P1172 and/or P1174* 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 12.

12. Monitor the OBD STATUS for DTC P1172 and/or P1174* in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES -

Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 11, 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) and the ECM/PCM, then go to step 1. If the screen indicates EXECUTING keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 10.