U0107
DTC U0107: Lost Communication With Throttle Actuator Control ModuleNOTE: 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 for Temporary DTCs or DTCs with the HDS.
Is DTC U0107 indicated?
YES - Check for, and repair any poor connections or loose terminals at the throttle body, the throttle actuator control module, and the PCM, then go to step 62. If the connections and 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 48.
NO - Intermittent failure, 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 PCM.
6. Clear the DTC with the HDS.
7. Turn the ignition switch OFF.
8. Disconnect the intake air duct from the throttle body.
9. Press the accelerator pedal to the floor.
10. Turn the ignition switch ON (II).
11. Check the throttle valve operation.
Does the throttle valve 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 42.
NO - Go to step 36.
13. Turn the ignition switch OFF.
14. Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
15. Check for continuity between C251 connector (13P) terminal No. 7 and body ground.
Is there continuity?
YES - Go to step 16.
NO - Repair open in the wire between the C251 connector and G101,then go to step 63.
16. Remove the throttle actuator control module relay (A).
17. Measure voltage between throttle actuator control module relay 4P connector terminal No. 4 and body ground.
Is there battery voltage?
YES - Go to step 19.
NO - Go to step 18.
18. Check the No. 1 THROTTLE ACTUATOR CONTROL (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. 1 THROTTLE ACTUATOR CONTROL (15 A) fuse, then go to step 63.
NO - Repair short in the wire between the throttle actuator control module relay (+B line) and the No. 1 THROTTLE ACTUATOR CONTROL (15 A) fuse, then go to step 63.
19. Install the throttle actuator control module relay.
20. Turn the ignition switch ON (II).
21. Measure voltage between C251 connector (13P) terminal No. 12 and body ground.
Is there battery voltage for about 2 seconds?
YES - Go to step 52.
NO - Go to step 22.
22. Turn the ignition switch OFF.
23. Remove the throttle actuator control module relay (A).
24. Check the throttle actuator control module relay.
Is the throttle actuator control module relay OK?
YES - Go to step 25.
NO - Replace the throttle actuator control module relay, then go to step 63.
25. Turn the ignition switch ON (II).
26. Measure voltage between throttle actuator control module relay 4P connector terminal No. 2 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 62.
27. Turn the ignition switch OFF.
28. Jump the SCS line with the HDS.
29. Disconnect PCM connector E (31P).
30. Check for continuity between PCM connector terminal E3 and throttle actuator control module relay 4P connector terminal No. 1.
Is there continuity?
YES - Go to step 31.
NO - Repair open in the wire between the PCM (E3) and the throttle actuator control module relay, then go to step 63.
31. Check for continuity between C251 connector (13P) terminal No. 12 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 63.
NO - Go to step 32.
32. Check for continuity between throttle actuator control module relay 4P connector terminal No. 3 and C251 connector (13P) terminal No. 12.
Is there continuity?
YES - Go to step 33.
NO - Repair open in the wire between the throttle actuator control module relay and the C251 connector (+B line), then go to step 63.
33. Disconnect the throttle actuator control module 16P connector.
34. Check for continuity between C251 connector (13P) terminal No. 12 and body ground.
Is there continuity?
YES - Repair short in the wire between the throttle actuator control module and the C251 connector, then go to step 63.
NO - Go to step 35.
35. Check for continuity between throttle actuator control module 16P connector terminal No. 2 and C251 connector (13P) terminal No. 12.
Is there continuity?
YES - Go to step 68.
NO - Repair open in the wire between the throttle actuator control module and the C251 connector, then go to step 63.
36. Turn the ignition switch OFF.
37. Jump the SCS line with the HDS.
38. Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
39. Disconnect PCM connector A (31P).
40. Check for continuity between PCM connector terminals A25 and body ground.
Is there continuity?
YES - Repair short in the wire between the PCM (A25) and the C251 connector, then go to step 63.
NO - Go to step 41.
41. Check for continuity between PCM connector terminal A25 and C251 connector (13P) terminal No. 11.
Is there continuity?
YES - Go to step 56.
NO - Repair open in the wire between the PCM (A25) and the C251 connector, then go to step 63.
42. Turn the ignition switch OFF.
43. Jump the SCS line with the HDS.
44. Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control module subharness.
45. Disconnect PCM connector A (31P).
46. Check for continuity between PCM connector terminal A26 and body ground.
Is there continuity?
YES - Repair short in the wire between the PCM (A26) and the C251 connector, then go to step 63.
NO - Go to step 47.
47. Check for continuity between PCM connector terminal A26 and C251 connector (13P) terminal No. 1.
Is there continuity?
YES - Go to step 59.
NO - Repair open in the wire between the PCM (A26) and the C251 connector, then go to step 63.
48. Turn the ignition switch OFF.
49. Jump the SCS line with the HDS.
50. Disconnect PCM connectors A (31P) and B (24P).
51. Check for continuity between body ground and PCM connector terminals A3 and B15 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 PCM, then go to step 1.
NO - Repair open in the wire between the PCM (A3, B15) and G101, then go to step 63.
52. Disconnect the throttle actuator control module 16P connector.
53. Check for continuity between throttle actuator control module 16P connector terminal No. 7 and C251 connector (13P) terminal No. 7.
Is there continuity?
YES - Go to step 54.
NO - Repair open in the wire between the throttle actuator control module and the C251 connector, then go to step 63.
54. Check for continuity between C251 connector (13P) terminal No. 12 and body ground.
Is there continuity?
YES - Repair short in the wire between the throttle actuator control module and the C251 connector, then go to step 63.
NO - Go to step 55.
55. Check for continuity between throttle actuator control module 16P connector terminal No. 2 and C251 connector (13P) terminal No. 12.
Is there continuity?
YES - Substitute a known-good throttle actuator control module, then go to step 63 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module, then go to step 63.
NO - Repair open in the wire between the throttle actuator control module and the C251 connector, then go to step 63.
56. Disconnect the throttle actuator control module 16P connector.
57. Check for continuity between C251 connector (13P) terminals No. 11 and body ground.
Is there continuity?
YES - Repair short in the wire between the throttle actuator control module and the C251 connector, then go to step 63.
NO - Go to step 58.
58. Check for continuity between throttle actuator control module 16P connector terminals No. 6 and C251 connector (13P) terminals No. 11.
Is there continuity?
YES - Substitute a known-good throttle actuator control module, then go to step 63 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module, then go to step 63.
NO - Repair open in the wire between the throttle actuator control module and the C251 connector, then go to step 63.
59. Disconnect the throttle actuator control module 16P connector.
60. Check for continuity between C251 connector (13P) terminals No. 1 and body ground.
Is there continuity?
YES - Repair short in the wire between the throttle actuator control module and the C251 connector, then go to step 63.
NO - Go to step 61.
61. Check for continuity between throttle actuator control module 16P connector terminals No. 14 and C251 connector (13P) terminals No. 1.
Is there continuity?
YES - Substitute a known-good throttle actuator control module, then go to step 63 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module, then go to step 63.
NO - Repair open in the wire between the throttle actuator control module and the C251 connector, then go to step 63.
62. Turn the ignition switch OFF.
63. Reconnect all connectors.
64. Turn the ignition switch ON (II).
65. Reset the PCM with the HDS.
66. Do the PCM idle learn procedure.
67. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC U0107 is indicated, check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, 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.
68. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
69. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC U0107 is indicated, check for poor connections or loose terminals at the throttle body, the throttle actuator control module relay, the throttle actuator control module, 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.