DTC Troubleshooting: P2138 (37)

DTC P2138:  APP Sensor A/B Incorrect Voltage Correlation

1.Turn the ignition switch ON (II).

2.Clear the DTC with the HDS.

3.Press the accelerator pedal to the floor.

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

Is DTC P2138 indicated?


YES - Go to 5.


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


5.Check APP SENSOR-A and APP SENSOR-B in the DATA LIST with the HDS.

Are they the same voltage?


YES - Go to 6.


NO - Go to 11.


6.Turn the ignition switch OFF.

7.Jump the SCS line with the HDS.

8.Disconnect the APP sensor 6P connector.

9.Disconnect ECM/PCM connector A (31P).

10.Check for continuity between ECM/PCM connector terminals A25 and A26.

 

Is there continuity?


YES - Repair short in the wire between the ECM/PCM terminals (A25, A26), then go to 13.


NO - Go to 21.


11.Turn the ignition switch OFF.

12.Replace the APP sensor.

13.Reconnect all connectors.

14.Turn the ignition switch ON (II).

15.Reset the ECM/PCM with the HDS.

16.Do the ECM/PCM idle learn procedure.

17.Turn the ignition switch OFF.

18.Turn the ignition switch ON.

19.Press the accelerator pedal to the floor.

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2138 is indicated, check for poor connections or loose terminals at the APP sensor 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


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

22.Turn the ignition switch OFF.

23.Turn the ignition switch ON.

24.Press the accelerator pedal to the floor.

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2138 is indicated, check for poor connections or loose terminals at the APP sensor 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