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 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.■
  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 OFF.
  1. Disconnect the throttle body 6P connector.
  1. Turn the ignition switch ON (II).
  1. Measure 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 OFF.
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM connector C (44P).