DTC Troubleshooting: P0122 (7) (K20Z: M/T)

DTC Troubleshooting: P0122 (7)

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 4.


NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the throttle body and the ECM/PCM.n


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

Are DTC P0122 and P0222 indicated at the same time?


YES - Go to 10.


NO - Go to 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/PCM 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/PCM (C20), then go to 18.


NO - Go to 23.


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

 

Is there about 5 V?


YES - Go to 16.


NO - Go to 11.

11.Turn the ignition switch OFF.

12.Jump the SCS line with the HDS.

13.Disconnect ECM/PCM connector C (44P).

14.Disconnect the throttle body 6P connector.

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

 

Is there continuity?


YES - Go to 23.


NO - Repair open in the wire between the throttle body and the ECM/PCM (C12), then go to 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/PCM with the HDS.

21.Do the ECM/PCM 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/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - Troubleshooting is complete.n


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

24.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 TP sensor A and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n