P0117
DTC P0117: ECT Sensor Circuit Low Voltage1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF.
4. Turn the ignition switch ON (II).
5. Check for Temporary DTCs or DTCs with the HDS.
Are DTC P0107, P0112, P0117, P2122, P2127, P2228, P0452, P2627, and P2630 indicated at same time?
YES - Go to step 15.
NO - Go to step 6.
6. Check the ECT SENSOR in the DATA LIST with the HDS.
Is about 356 °F (180 °C) or higher, or 0.08 V or less indicated?
YES - Go to step 7.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the ECM/PCM.
7. Turn the ignition switch OFF.
8. Disconnect the ECT sensor 2P connector.
9. Turn the ignition switch ON (II).
10. Check the ECT SENSOR in the DATA LIST with the HDS.
Is about 356 °F (180 °C) or higher, or 0.08 V or less indicated?
YES - Go to step 11.
NO - Go to step 24.
11. Turn the ignition switch OFF.
12. Jump the SCS line with the HDS.
13. Disconnect ECM/PCM connector D (17P).
14. Check for continuity between ECT sensor 2P connector terminal No.1 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECT sensor and ECM/PCM (D17), then go to step 26.
NO - Go to step 30.
15. Turn the ignition switch OFF.
16. Jump the SCS line with the HDS.
17. Disconnect ECM/PCM connectors A (31P) and D (17P).
18. Disconnect the connectors from these parts:
- MAP sensor
- Front/rear A/F sensor
- APP sensor
- IMRC actuator
- EGR valve
- FTP sensor
- Input shaft (mainshaft) speed sensor
- Output shaft (countershaft) speed sensor
19. Check for continuity between body ground and ECM/PCM connector terminals A31,02, 06, and D12 individually.
Is there continuity?
YES - Repair short in the wire between the ECM/PCM (A31,02, 06 or D12) and each part, then go to step 26.
NO - Go to step 20.
20. Reconnect ECM/PCM connectors A (31P) and D (17P).
21. Turn the ignition switch ON (II).
22. Measure voltage between ECM/PCM connector terminal D6 and body ground.
Is there about 5 V?
YES - Go to step 23.
NO - Go to step 30.
23. Continue to monitor voltage at the ECM/PCM connector terminal D6 while reconnecting these parts, one at a time:
- MAP sensor
- Front/rear A/F sensor
- APP sensor
- IMRC actuator
- EGR valve
- FTP sensor
- Input shaft (mainshaft) speed sensor
- Output shaft (countershaft) speed sensor
Did the voltage drop to about 0 V?
YES - Replace the part that caused the voltage to drop, then go to step 27.
NO - Go to step 30.
24. Turn the ignition switch OFF.
25. Replace the ECT sensor.
26. Turn the ignition switch ON (II).
27. Reset the ECM/PCM with the HDS.
28. Do the ECM/PCM idle learn procedure. Programming and Relearning
29. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0117 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/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 completed.
30. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
31. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0117 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/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 ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM