DTC Troubleshooting
DTC Troubleshooting: U0107
DTC U0107: Lost Communication With Throttle Actuator Control Module
CAUTION
Do not insert your fingers into the installed throttle body when you turn the ignition switch to ON (II) or while the ignition switch is ON (II). If you do, you will seriously injure your fingers if the throttle valve is activated.
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Reading and Clearing Diagnostic Trouble Codes
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Check for Pending or Confirmed 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 Pending or Confirmed DTCs with the HDS.
Is DTC U0107 indicated?
YES - Go to step 48.
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 PCM.
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.
9. Press the accelerator pedal to the floor.
10. Turn the ignition switch to 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 to LOCK (0).
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) from the passenger's under-dash fuse/relay box.
17. Measure the voltage between throttle actuator control module relay 4P connector terminal No. 1 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 driver's 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 replace the fuse, and 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 to ON (II).
21. Measure the 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 to LOCK (0).
23. Remove the throttle actuator control module relay (A) from the passenger's under-dash fuse/relay box.
24. Test the throttle actuator control module relay. Power Relay Test
Is the 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 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 62.
27. Turn the ignition switch to LOCK (0).
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. 3.
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. 2 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. Service and Repair
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 to LOCK (0).
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 to LOCK (0).
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 to LOCK (0).
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. Service and Repair
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, Service and Repair then go to step 63 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module, Service and Repair 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. Service and Repair
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 terminal No. 6 and C251 connector (13P) terminal No. 11.
Is there continuity?
YES - Substitute a known-good throttle actuator control module, Service and Repair then go to step 63 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module, Service and Repair 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. Service and Repair
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 terminal No. 14 and C251 connector (13P) terminal No. 1.
Is there continuity?
YES - Substitute a known-good throttle actuator control module, Service and Repair then go to step 63 and recheck. If DTC U0107 is not indicated, replace the original throttle actuator control module, Service and Repair 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 to LOCK (0).
63. Reconnect all connectors.
64. Turn the ignition switch to ON (II).
65. Reset the PCM with the HDS.
66. Do the PCM idle learn procedure. PCM Idle Learn Procedure
67. Check for Pending or Confirmed 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 PCM, then go to step 1.
NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
68. Reconnect all connectors.
69. Update the PCM if it does not have the latest software, PCM Update or substitute a known-good PCM. Reading and Clearing Diagnostic Trouble Codes
70. Check for Pending or Confirmed 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 PCM. If the PCM was updated, substitute a known-good PCM, Reading and Clearing Diagnostic Trouble Codes then recheck. If the PCM was substituted, go to step 1.
NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. Service and Repair If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.