Description
This diagnostic applies to internal microprocessor integrity conditions within the powertrain control module (PCM). This diagnostic also addresses if the PCM is not programmed.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC P0602 Control Module Not Programmed |
| • | DTC P1621 Control Module Long Term Memory Performance |
| • | DTC P2610 Control Module Ignition Off Timer Performance |
Condition for Running the DTC
| • | The ignition is ON. |
| • | DTC P0602, P1621, and P2610 run continuously once the above condition is met. |
Conditions for Setting the DTC
| • | DTC P0602 and DTC P1621 set when an error is detected in the electrically erasable programmable read only memory (EEPROM) data readout. |
| • | DTC P2610 sets when there is a discrepancy of 500 seconds or more between the EONV timer and the control module internal clock. |
Action Taken When the DTC Sets
| • | The PCM illuminates the malfunction indicator lamp (MIL). |
| • | The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame buffer. |
Conditions for Clearing the MIL/DTC
| • | The MIL turns OFF after 3 consecutively passing trips without a fault present. |
| • | A history DTC clears after 40 consecutive warm-up cycles without a fault. |
| • | Perform the scan tool Clear DTC Information function. |
Diagnostic Aids
Check the PCM for water contamination. Water entering the PCM can cause damage and corrosion to the circuit boards and to internal components. Repair the source of the water entry before the installation of a replacement PCM.
A DTC P0602 or DTC P1621 can set if an incorrect PCM is installed in the vehicle. Install the correct PCM according to the vehicle and/or the engine type and equipment options.
Test Description
The numbers below refer to the step numbers in the diagnostic table.
-
The Diagnostic System Check - Vehicle prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
-
A DTC P0602 indicates the PCM is not programmed.
-
Attempt to program the PCM. If the PCM fails to program a second time, replace the PCM.
Step | Action | Yes | No |
|---|---|---|---|
Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | |
|
Important: If the vehicle does not start, crank the engine in order to allow the DTC to set.
Is DTC P0602 set? | Go to Step 3 | Go to Step 5 | |
3 | Program the powertrain control module (PCM). Refer to Service Programming System (SPS) in Programming and Setup. Does DTC P0602 reset? | Go to Step 4 | Go to Step 7 |
4 |
Does DTC P0602 reset? | Go to Step 6 | Go to Step 7 |
Is DTC P0685 or P0688 set? | Go to Step 6 | ||
6 |
Did you complete the replacement? | Go to Step 7 | -- |
7 |
Did the DTC fail this ignition? | Go to Step 2 | Go to Step 8 |
8 | 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 |
