## 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.