P0122

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.

1. Turn the ignition switch 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 ECM.

4. Check for Temporary DTCs or 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 OFF.
6. Disconnect the throttle body 6P connector.
7. Jump the SCS line with the HDS.
8. Disconnect ECM connector C (44P).




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

Is there continuity?

YES - Repair short in the wire between the throttle body and the ECM (C20), then go to step 18.

NO - Go to step 23.




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

Is there about 5 V?

YES - Go to step 16.

NO - Go to step 11.

11. Turn the ignition switch OFF.
12. Jump the SCS line with the HDS.
13. Disconnect ECM connector C (44P).
14. Disconnect the throttle body 6P connector.




15. Check for continuity between ECM connector terminal C12 and throttle body 6P connector terminal No. 2.

Is there continuity?

YES - Go to step 23.

NO - Repair open in the wire between the throttle body and the ECM (C12),then go to step 18.

16. Turn the ignition switch OFF.
17. Replace the throttle body.
18. Reconnect all connectors.
19. Turn the ignition switch ON (II).
20. Reset the ECM with the HDS.
21. Do the ECM idle learn procedure.
22. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P0122 is indicated, check for poor connections or loose terminals at the throttle body and the ECM, then go to STEP 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Troubleshooting is complete.

23. Update the ECM if it does not have the latest software, or substitute a known-good ECM.
24. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0122 indicated?

YES - Check for poor connections or loose terminals at TP sensor A and the ECM. If the ECM was updated, substitute a known-good ECM, then recheck. If the ECM was substituted, go to step 1.

NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.