Diagnostic Aids
WARNING: This page is about a different variant/trim than selected.
- A condition with the charging system may cause this DTC to set. Refer to Diagnostic Starting Point - Engine Electrical in Engine Electrical.
- For an intermittent condition, refer to Intermittent Conditions .
DTC P1640
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) Connector End Views or Engine Controls 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 | Is DTC P0446, P0496, P0560, or P0563 set? | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | Go to Step 3 |
| 3 | Observe the General Info - Output Data List with a scan tool. Do any parameters indicate a fault present? |
Go to Step 4 | Go to Step 5 |
| 4 | Test for a short to voltage on the control circuit of the component that indicated a fault. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 6 | Go to Step 5 |
| 5 | Replace the engine control module (ECM). Refer to Control Module References
in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 6 | - |
| 6 |
|
Go to Step 2 | Go to Step 7 |
| 7 | 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 |