DTC Troubleshooting

DTC Troubleshooting: P0122 (7-1)

DTC P0122:

TP Sensor A 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. Check TP SENSOR A in the DATA LIST with the HDS.

Is there about 0.3 V or less?

YES -

Go to step 4.

NO -

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM.�

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

Are DTC P0122 and P0222 indicated at the same time?

YES -

Go to step 10.

NO -

Go to step 5.

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

6. Disconnect the throttle body 6P connector.

7. Jump the SCS line with the HDS.

8. Disconnect PCM connector B (49P).

9. Check for continuity between throttle body 6P connector terminal No. 1 and body ground.





Is there continuity?

YES -

Repair a short in the wire between the throttle body and the PCM (B17), then go to step 19.

NO -

Go to step 18.

10. Disconnect the throttle body 6P connector.

11. Measure the voltage between throttle body 6P connector terminal No. 2 and body ground.





Is there about 5 V?

YES -

Go to step 17.

NO -

Go to step 12.

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

13. Jump the SCS line with the HDS.

14. Disconnect PCM connector B (49P).

15. Connect throttle body 6P connector terminal No. 2 to body ground with a jumper wire.






16. Check for continuity between PCM connector terminal B18 and body ground.





Is there continuity?

YES -

Go to step 24.

NO -

Repair an open in the wire between the throttle body and the PCM (B18), then go to step 19.

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

18. Replace the throttle body Removal and Replacement.

19. Reconnect all connectors.

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

21. Reset the PCM with the HDS.

22. Do the PCM idle learn procedure PCM Idle Learn Procedure.

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

Is DTC P0122 indicated?

YES -

Check for poor connections or loose terminals at the throttle body and the PCM, then go to step 1.

NO -

Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�

24. Reconnect all connectors.

25. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM.

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

Is DTC P0122 indicated?

YES -

Check for poor connections or loose terminals at the throttle body and the PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.

NO -

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 are indicated, go to the indicated DTC's troubleshooting.�