Diagnostic Aids
- If any sensor using a 5-volt bias voltage, such as the intake air temperature (IAT) sensor or fuel sensor, is shorted to voltage, DTC P0641 may set in addition to DTC P0651.
- For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
DTC P0651
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module (PCM) Connector End Views |
||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 |
|
- | Go to Step 3 | Go to Diagnostic Aids |
| 3 |
|
4.8-5.2 V | Go to Step 7 | Go to Step 4 |
| 4 | Is the voltage measured in the previous step more than the specified value? | 5.2 V | Go to Step 5 | Go to Step 6 |
| 5 | Test the 5-volt reference circuit for a short to voltage. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 9 | Go to Step 8 |
| 6 | Test the 5-volt reference circuit for a short to ground or any sensor low reference circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 9 | Go to Step 8 |
| 7 | Replace the affected sensor. Refer to Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement
in Heating, Ventilation, and Air Conditioning. Did you complete the replacement? |
- | Go to Step 9 | - |
| 8 | Replace the powertrain control module (PCM). Refer to Control Module References
in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 9 | - |
| 9 |
|
- | Go to Step 2 | Go to Step 10 |
| 10 | 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 in Vehicle DTC Information | System OK |