( TF09EACK72100092123FAAT00 )
DTC Troubleshooting: P2123 (37)
DTC P2123:
 APP Sensor A (TP Sensor D) 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 to ON (II).
  1. Check APP SENSOR A in the DATA LIST with the HDS.
Is there about 4.9 V or more?
YES -
Go to Step 3 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at APP sensor A and the ECM/PCM.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the APP sensor 6P connector.
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between APP sensor 6P connector terminals No. 1 and No. 2.
Is there about 5 V?
YES -
Go to Step 12 .
NO -
Go to Step 7 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector A (49P).
  1. Connect APP sensor 6P connector terminal No. 2 to body ground with a jumper wire.
  1. Check for continuity between ECM/PCM connector terminal A36 and body ground.
Is there continuity?
YES -
Go to Step 19 .
NO -
Repair open in the wire between the ECM/PCM (A36) and APP sensor A, then go to Step 14 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Reset the ECM/PCM with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2123 indicated?
YES -
Check for poor connections or loose terminals at APP sensor A and the ECM/PCM, then go to Step 1 .
NO -
Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■
  1. Reconnect all connectors.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2123 indicated?
YES -
Check for poor connections or loose terminals at APP sensor A and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then recheck. If the ECM/PCM was substituted, go to Step 1 .
NO -
If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■