DTC Troubleshooting: P1248 (37-16), P2138 (37-14)

DTC P1248:  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 P1248 and/or P2138 indicated?


YES - Go to 5.


NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the APP sensor and the ECM.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 10.


6.Turn the ignition switch OFF, and wait 30 seconds.

7.Disconnect the APP sensor 6P connector.

8.Disconnect ECM connector No. 2 (58P).

9.Check for continuity between APP sensor 6P connector terminals No. 3 and No. 4.

 

Is there continuity?


YES - Repair short in the wire between ECM connector No. 2 terminals No. 9 and No. 22, then go to 12.


NO - Go to 17.


10.Turn the ignition switch OFF.

11.Replace the APP sensor.

12.Reconnect all connectors.

13.Turn the ignition switch ON (II).

14.Reset the ECM with the HDS.

15.Press the accelerator pedal to the floor.

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P1248 and/or P2138 is indicated, check for poor connections or loose terminals at the APP sensor and the ECM, 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


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

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P1248 and/or P2138 is indicated, check for poor connections or loose terminals at the APP sensor and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.


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