DTC Troubleshooting
DTC Troubleshooting: U0107
DTC U0107: Lost Communication With Throttle Actuator Control Module
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Initial Inspection and Diagnostic Overview
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0107 indicated?
YES - Check for poor connections or loose terminals at the throttle body, the throttle actuator control module, and the ECM. If you repair the connections or the terminals, then go to step 50. If the connections and the terminals are OK, go to step 6.
NO - Go to step 4.
4. Start the engine.
5. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0107 indicated?
YES - Go to step 46.
NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, and the ECM.
6. Clear the DTC with the HDS.
7. Turn the ignition switch to LOCK (0).
8. Disconnect the intake air duct from the throttle body. Removal and Replacement
9. Press the accelerator pedal to the floor.
10. Turn the ignition switch to ON (II).
11. Check the throttle valve operation.
Does it open after it closes?
YES - Go to step 12.
NO - Go to step 13.
12. Check the throttle valve again.
Does the throttle valve open fully?
YES - Go to step 40.
NO - Go to step 34.
13. Turn the ignition switch to LOCK (0).
14. Disconnect the throttle actuator control module 16P connector.
15. Check for continuity between throttle actuator control module 16P connector terminal No. 7 and body ground.
Is there continuity?
YES - Go to step 16.
NO - Repair open in the wire between the throttle body, the throttle actuator control module, and G101, then go to step 50.
16. Remove the throttle actuator control module relay (A).
17. Measure the voltage between throttle actuator control module relay 4P connector terminal No. 2 and body ground.
Is there battery voltage?
YES - Go to step 19.
NO - Go to step 18.
18. Check the No. 14 DBW (15 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES - Repair open in the wire between the throttle actuator control module relay (+B line) and the No. 14 DBW (15 A) fuse, then go to step 50.
NO - Repair short in the wire between the throttle actuator control module relay (+B line) and the No. 14 DBW (15 A) fuse. Also replace the fuse, then go to step 50.
19. Install the throttle actuator control module relay.
20. Turn the ignition switch to ON (II).
21. Measure the voltage between throttle actuator control module 16P connector terminal No. 2 and body ground.
Is there battery voltage for about 2 seconds?
YES - Substitute a known-good throttle actuator control module, Service and Repair then go to step 50 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module, Service and Repair then go to step 50.
NO - Go to step 22.
22. Turn the ignition switch to LOCK (0).
23. Remove the throttle actuator control module relay (A).
24. Check the throttle actuator control module relay. Testing and Inspection
Is the relay OK?
YES - Go to step 25.
NO - Replace the throttle actuator control module relay, then go to step 50.
25. Turn the ignition switch to ON (II).
26. Measure the voltage between throttle actuator control module relay 4P connector terminal No. 4 and body ground.
Is there battery voltage?
YES - Go to step 27.
NO - Repair open in the wire between the throttle actuator control module relay and PGM-FI main relay 1 (FI MAIN), then go to step 50.
27. Turn the ignition switch to LOCK (0).
28. Jump the SCS line with the HDS.
29. Disconnect ECM connector D (17P).
30. Check for continuity between ECM connector terminal D15 and throttle actuator control module relay 4P connector terminal No. 3.
Is there continuity?
YES - Go to step 31.
NO - Repair open in the wire between the ECM (D15) and the throttle actuator control module relay, then go to step 50.
31. Check for continuity between throttle actuator control module 16P connector terminal No. 2 and body ground.
Is there continuity?
YES - Repair short in the wire between the throttle actuator control module and the throttle actuator control module relay (+B line), then go to step 50.
NO - Go to step 32.
32. Connect throttle actuator control module relay 4P connector terminal No. 1 to body ground with a jumper wire.
33. Check for continuity between throttle actuator control module 16P connector terminal No. 2 and body ground.
Is there continuity?
YES - Go to step 56.
NO - Repair open in the wire between the throttle actuator control module and the throttle actuator control module relay (+B line), then go to step 50.
34. Turn the ignition switch to LOCK (0).
35. Jump the SCS line with the HDS.
36. Disconnect the throttle actuator control module 16P connector. Service and Repair
37. Disconnect ECM connector B (24P).
38. Check for continuity between ECM connector terminal B19 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM (B19) and the throttle actuator control module, then go to step 50.
NO - Go to step 39.
39. Check for continuity between ECM connector terminal B19 and throttle actuator control module 16P connector terminal No. 6.
Is there continuity?
YES - Substitute a known-good throttle actuator control module, Service and Repair then go to step 50 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module, Service and Repair then go to step 50. If DTC U0107 is indicated, go to step 56.
NO - Repair open in the wire between the ECM (B19) and the throttle actuator control module, then go to step 50.
40. Turn the ignition switch to LOCK (0).
41. Jump the SCS line with the HDS.
42. Disconnect the throttle actuator control module 16P connector.
43. Disconnect ECM connector B (24P).
44. Check for continuity between ECM connector terminal B20 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM (B20) and the throttle actuator control module, then go to step 50.
NO - Go to step 45.
45. Check for continuity between ECM connector terminal B20 and throttle actuator control module 16P connector terminal No. 14.
Is there continuity?
YES - Substitute a known-good throttle actuator control module, Service and Repair then go to step 50 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module, Service and Repair then go to step 50. If DTC U0107 is indicated, go to step 56.
NO - Repair open in the wire between the ECM (B20) and the throttle actuator control module, then go to step 50.
46. Turn the ignition switch to LOCK (0).
47. Jump the SCS line with the HDS.
48. Disconnect ECM connector A (31P).
49. Check for continuity between body ground and ECM connector terminals A8 and A9 individually.
Is there continuity?
YES - Check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, and the ECM, then go to step 1.
NO - Repair open in the wire between the ECM (A8, A9) and G101, then go to step 50.
50. Turn the ignition switch to LOCK (0).
51. Reconnect all connectors.
52. Turn the ignition switch to ON (II).
53. Reset the ECM with the HDS.
54. Do the ECM idle learn procedure. ECM Idle Learn Procedure
55. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0107 indicated?
YES - Check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, and the ECM, then go to step 1.
NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
56. Reconnect all connectors.
57. Update the ECM if it does not have the latest software, ECM Update or substitute a known-good ECM. Initial Inspection and Diagnostic Overview
58. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0107 indicated?
YES - Check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, and the ECM. If the ECM was updated, substitute a known-good ECM, Initial Inspection and Diagnostic Overview then recheck. If the ECM was substituted, go to step 1.
NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. Service and Repair If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.