DTC Troubleshooting: P2128 (37)

DTC P2128:  APP Sensor B (Throttle Position Sensor E) Circuit High 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.Check APP SENSOR B in the DATA LIST with the HDS.

Is there about 4.9 V or more?


YES - Go to 3.


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


3.Turn the ignition switch OFF.

4.Disconnect the APP sensor 6P connector.

5.Turn the ignition switch ON (II).

6.Measure voltage between APP sensor 6P connector terminals No. 5 and No. 6.

 

Is there about 5 V?


YES - Go to 12.


NO - Go to 7.

7.Turn the ignition switch OFF.

8.Jump the SCS line with the HDS.

9.Disconnect ECM/PCM connector A (44P).

10.Connect APP sensor 6P connector terminal No. 5 to body ground with a jumper wire.

 

11.Check for continuity between ECM/PCM connector terminal A34 and body ground.

 

Is there continuity?


YES - Go to 19.


NO - Repair open in the wire between the ECM/PCM (A34) and APP sensor B, then go to 14.

12.Turn the ignition switch OFF.

13.Replace the accelerator pedal module.

14.Reconnect all connectors.

15.Turn the ignition switch ON (II).

16.Reset the ECM/PCM with the HDS.

17.Do the ECM/PCM idle learn procedure.

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2128 is indicated, check for poor connections or loose terminals at APP sensor B 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


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

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2128 is indicated, check for poor connections or loose terminals at APP sensor B 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