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 |
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| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 | Is DTC P0685 also set? | - | Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 3 |
| 3 |
|
- | Go to Step 4 | Go to DTC P0685 to diagnose the powertrain relay |
| 4 |
|
0 V | Go to Step 5 | Go to Diagnostic Aids |
| 5 |
|
0 V | Go to Step 6 | Go to Step 12 |
| 6 |
|
B+ | Go to Step 7 | Go to Step 14 |
| 7 |
|
5 ohm | Go to Step 8 | Go to Step 15 |
| 8 | 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 16 | Go to Step 9 |
| 9 | Does the voltage measure more than the specified value? | 5 V | Go to Step 13 | Go to Step 10 |
| 10 | Does the voltage measure less than the specified value? | 5 V | Go to Step 11 | - |
| 11 | 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 21 | Go to Step 19 |
| 12 | Repair the short to battery voltage in the ignition 1 voltage circuit. Refer to Wiring Repairs
. Did you complete the repair? |
- | Go to Step 21 | - |
| 13 | 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 21 | Go to Step 20 |
| 14 | 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 21 | - |
| 15 | Repair the open or high resistance in the TAC module ground circuit. Refer to Wiring Repairs
. Did you complete the repair? |
- | Go to Step 21 | - |
| 16 | Test the electronic throttle control (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 21 | Go to Step 17 |
| 17 | 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 21 | Go to Step 18 |
| 18 | Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement
. Did you complete the replacement? |
- | Go to Step 21 | - |
| 19 | 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 21 | Go to Step 20 |
| 20 | Replace the PCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 21 | - |
| 21 |
|
- | Go to Step 2 | Go to Step 22 |
| 22 |
IMPORTANT:
Be aware that repairing one individual condition may correct more than one 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 |