DTC Troubleshooting: P0123 (7) (K20Z: M/T) 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).
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 4 .
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the throttle body and the ECM/PCM.n
4. Check for Temporary DTCs or DTCs with the HDS.Are DTC P0123 and P0223 indicated at the same time?
YES - Go to 13 .
NO - Go to 5 .
5. Turn the ignition switch OFF.
6. Disconnect the throttle body 6P connector.
7. Turn the ignition switch ON (II).
8. Measure voltage between throttle body 6P connector terminal No. 1 and body ground.
Is there about 5 V?
YES - Go to 18 .
NO - Go to 9 .
9. Turn the ignition switch OFF.
10. Jump the SCS line with the HDS.
11. Disconnect ECM/PCM connector C (44P).
12. Check for continuity between ECM/PCM connector terminal C20 and throttle body 6P connector terminal No. 1.
Is there continuity?
YES - Go to 25 .
NO - Repair open in the wire between the throttle body and the ECM/PCM (C20), then go to 20 .
13. Turn the ignition switch OFF.
14. Disconnect the throttle body 6P connector.
15. Jump the SCS line with the HDS.
16. Disconnect ECM/PCM connector C (44P).
17. Check for continuity between ECM/PCM connector terminal C39 and throttle body 6P connector terminal No. 4.
Is there continuity?
YES - Go to 25 .
NO - Repair open in the wire between the throttle body and the ECM/PCM (C39), then go to 20 .
18. Turn the ignition switch OFF.
20. Reconnect all connectors.
21. Turn the ignition switch ON (II).
22. Reset the ECM/PCM with the HDS.
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 the throttle body and the ECM/PCM, then go to 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - Troubleshooting is complete.n
26. 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 ECM/PCM, then go to 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. n