Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
- DTC U0107 sets if the battery voltage is low or the PCM is replaced or reflashed. If the customer's concern is slow cranking, or if the engine is not cranking because the battery voltage is low, ignore DTC U0107. Clear any DTCs from memory that may have set from the low battery voltage condition.
- If the condition is intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
DTC U0107
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module Connector End Views and Engine Controls Connector End Views |
||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
0 V | Go to Step 3 | Go to Diagnostic Aids |
| 3 |
|
0 V | Go to Step 4 | Go to Step 10 |
| 4 |
|
B+ | Go to Step 5 | Go to Step 12 |
| 5 |
|
5 Ω | Go to Step 6 | Go to Step 13 |
| 6 | Test for voltage between both serial data circuits and a good ground using a DMM. Does the voltage measure within the specified range? |
2-5 V | Go to Step 14 | Go to Step 7 |
| 7 | Does the voltage measure more than the specified value? | 5 V | Go to Step 11 | Go to Step 8 |
| 8 | Does the voltage measure less than the specified value? | 5 V | Go to Step 9 | - |
| 9 | Test for an open or for a short to ground in the serial data circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the conditions? |
- | Go to Step 19 | Go to Step 17 |
| 10 | Repair the short to battery voltage in the ignition 1 voltage circuit. Refer to Wiring Repairs
. Did you complete the repair? |
- | Go to Step 19 | - |
| 11 | Test for a short to voltage on the TAC module serial data circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the conditions? |
- | Go to Step 19 | Go to Step 18 |
| 12 | Repair the open or short to ground in the ignition 1 voltage circuit. Refer to Wiring Repairs
. Did you complete the repair? |
- | Go to Step 19 | - |
| 13 | Repair the open or high resistance in the TAC module ground circuit. Refer to Wiring Repairs
. Did you complete the repair? |
- | Go to Step 19 | - |
| 14 | Test the ETC ignition 1 voltage circuit for the high resistance. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 19 | Go to Step 15 |
| 15 | Test for an intermittent and for a poor connection at the throttle body. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 19 | Go to Step 16 |
| 16 | Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement (L26)
or Throttle Body Assembly Replacement (L32)
. Did you complete the replacement? |
- | Go to Step 19 | - |
| 17 | Test for an intermittent and for a poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 19 | Go to Step 18 |
| 18 | Replace the PCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 19 | - |
| 19 |
|
- | Go to Step 2 | Go to Step 20 |
| 20 |
IMPORTANT:
Be aware that repairing 1 individual condition may correct more than 1 DTC. Observe the Capture Info with a scan tool.Are there any DTCs that have not been diagnosed? |
- | Go to Diagnostic Trouble Code (DTC) List - Vehicle | System OK |