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 (44P).