DTC Troubleshooting: P2123 (37)

DTC P2123:  APP sensor A Circuit High Voltage

1.Turn the ignition switch ON (II).

2.Check the APP SENSOR-A in the DATA LIST with the HDS.

Is there about 100 %, or 4.82 V or higher when the throttle is fully closed?


YES - Go to 3.


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


3.Turn the ignition switch OFF.

4.Disconnect the throttle body 6P connector.

5.Check for continuity between the APP sensor 6P connector terminal No. 3 and body ground.

 

Is there continuity?


YES - Go to 6.


NO - Repair open in the wire between the ECM connector No. 3 terminal No. 29 (test pin box terminal No. 58) and the APP sensor A, then go to 11.


6.Turn the ignition switch ON (II).

7.Check the APP SENSOR-A in the DATA LIST with the HDS.

Is there about 100 %, or 4.82 V or higher when the throttle is fully closed?


YES - Go to 15.


NO - Go to 8.


8.Turn the ignition switch OFF.

9.Replace the APP sensor.

10.Reconnect all connectors.

11.Turn the ignition switch ON (II).

12.Do the ECM RESET in the CLEAR MENU with the HDS.

13.Do the ETCS learn procedure.

14.Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2123 is indicated, check for poor connections or loose terminals at the APP sensor A and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.


NO - Troubleshooting is complete.n


15.Substitute a known-good ECM.

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

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2123 is indicated, check for poor connections or loose terminals at the APP sensor A and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.


NO - Replace the original ECM.