( TF09EABK72100090123FAAT00 )
DTC Troubleshooting: P0123 (7)
DTC P0123:
 TP Sensor A 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. Clear the DTC with the HDS.
  1. Check TP SENSOR A in the DATA LIST with the HDS.
Is there about 4.8 V or more?
YES -
Go to Step 4 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the ECM/PCM.■
  1. Check for Temporary DTCs or DTCs with the HDS.
Are DTC P0123 and P0223 indicated at the same time?
YES -
Go to Step 13 .
NO -
Go to Step 5 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the throttle body 6P connector.
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between throttle body 6P connector terminal No. 1 and body ground.
Is there about 5 V?
YES -
Go to Step 18 .
NO -
Go to Step 9 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector C (49P).
  1. Check for continuity between ECM/PCM connector terminal C20 and throttle body 6P connector terminal No. 1.
Is there continuity?
YES -
Go to Step 25 .
NO -
Repair open in the wire between the throttle body and the ECM/PCM (C20), then go to Step 20 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the throttle body 6P connector.
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM/PCM connector C (49P).
  1. Check for continuity between ECM/PCM connector terminal C43 and throttle body 6P connector terminal No. 4.
Is there continuity?
YES -
Go to Step 25 .
NO -
Repair open in the wire between the throttle body and the ECM/PCM (C43), then go to Step 20 .
  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 P0123 indicated?
YES -
Check for poor connections or loose terminals at the throttle body 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 P0123 indicated?
YES -
Check for poor connections or loose terminals at TP 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.■