P0123
DTC P0123: TP Sensor A Circuit High Voltage1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. 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, system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM.
4. Check for Temporary DTCs or DTCs with the HDS.
Are DTC P0123 and P0223 indicated at the same time?
YES - Go to step 11.
NO - Go to step 5.
5. Measure voltage between throttle body 6P connector terminal No.1 and body ground.
Is there about 5 V?
YES - Go to step 16.
NO - Go to step 6
6. Turn the ignition switch OFF.
7. Jump the SCS line with the HDS.
8. Disconnect PCM connector B (44P).
9. Disconnect the throttle body 6P connector.
10. Check for continuity between PCM connector terminal B17 and throttle body 6P connector terminal No.1.
Is there continuity?
YES - Go to step 23,
NO - Repair open in the wire between the throttle body and the PCM (B17), then go to step 18.
11. Turn the ignition switch OFF.
12. Disconnect the throttle body 6P connector.
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector B (44P).
15. Check the continuity between PCM connector terminal B34 and throttle body 6P connector terminal No.4.
Is there continuity?
YES - Go to step 23.
NO - Repair open in the wire between the throttle body and the PCM (B34), then go to step 18.
16. Turn the ignition switch OFF.
17. Replace the throttle body.
18. Reconnect all connectors.
19. Turn the ignition switch ON (II).
20. Reset the PCM with the HDS.
21. Do the PCM idle learn procedure.
22. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0123 is indicated, check for poor connections or loose terminals at the throttle body and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - Troubleshooting is complete.
23. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
24. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0123 is indicated, check for poor connections or loose terminals at TP sensor A and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM.