Circuit Description
This diagnostic applies to internal microprocessor integrity conditions within the control module. This diagnostic table also addresses if the control module is not programmed.
DTC Descriptors
This diagnostic procedure supports the following DTCs.
| • | DTC P0601 Control Module Read Only Memory (ROM) |
| • | DTC P0602 Control Module Not Programmed |
| • | DTC P0604 Control Module Random Access Memory (RAM) |
| • | DTC P1683 Control Module Ignition Off Timer Performance |
Conditions for Running the DTC
| • | The ignition is ON, or the engine is running. |
| • | DTC P0601, P0602, P0604, and P1683 run continuously. |
Conditions for Setting the DTC
The DTC specific internal PCM fault is detected and present for less than 1 second.
Diagnostic Aids
For complete details on programming the PCM, refer to Service Programming System (SPS) in Vehicle Control Systems.
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check-Engine Controls? | Go to Step 2 | |
Is DTC P0602 set? | Go to Step 3 | Go to Step 5 | |
3 | Program the PCM. Refer to Service Programming System (SPS) . Does DTC P0602 reset? | Go to Step 4 | Go to Step 6 |
4 |
Does DTC P0602 reset? | Go to Step 5 | Go to Step 6 |
5 | Replace the PCM. Refer to Powertrain Control Module Replacement . Did you complete the replacement? | Go to Step 6 | -- |
6 |
Does the DTC run and pass? | Go to Step 7 | Go to Step 2 |
7 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | System OK |
