Description
DTC P0601, P0604, P0606, P0607 or P2610 sets when the powertrain control module (PCM) has determined that the control module has an internal fault. The PCM performs continuous self checks of all internal circuits. If the status of an internal memory circuit within the control module is incorrect, a DTC P0601 or P0604 sets. If the inputs or outputs from the 2 central processing units (CPU) within the control module deviate from the standard level, a DTC P0606 or P0607 sets. The control module has several internal clock or timer circuits. The DTC P2610 diagnostic monitors the internal timer circuit responsible for the ignition OFF operation of the evaporative emission (EVAP) system vacuum leak pump. If the there is an error in the control module timer, a DTC P2610 sets.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC P0601 Control Module Read Only Memory (ROM) |
| • | DTC P0604 Control Module Random Access Memory (RAM) |
| • | DTC P0606 Control Module Internal Performance |
| • | DTC P0607 Control Module Performance |
| • | DTC P2610 Control Module Ignition Off Timer Performance |
Condition for Running the DTC
| • | DTC P0601, P0604, P0606, and P0607--The control module is ON or awake. |
| • | DTC P2610--The engine has been running for at least 10 minutes. |
| • | DTC P0601, P0604, P0606, and P0607 run continuously once the above condition is met. |
| • | DTC P2610 runs once per drive cycle when the above condition is met. |
Conditions for Setting the DTC
| • | DTC P0601, P0604, P0606, or P0607 sets when an internal PCM error is detected. |
| • | DTC P2610 sets when the PCM engine running timer and the engine soak timer do not agree. |
Action Taken When the DTC Sets
| • | DTC P0601, P0604, P0606, and P0607--The PCM illuminates the malfunction indicator lamp (MIL). |
| • | DTC P2610--The PCM illuminates the malfunction indicator lamp (MIL) during the second key cycle in which the diagnostic trouble code (DTC) sets. |
| • | 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 P0601, P0604, P0606, P0607 or P2610 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.
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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.
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This step determines if the fault is present. Replace the PCM if DTC P0601, P0604, P0606, P0607 or P2610 sets again.
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A short to ground on one of the shared 5 volt reference circuits can cause a DTC P0606 to set.
Step | Action | Yes | No |
|---|---|---|---|
Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | ||
|
Important: If the vehicle does not start, crank the engine in order to allow the DTC to set.
Did DTC P0606 set? | Go to Step 4 | Go to Step 3 | |
3 | Did DTC P0601, P0604, P0607 or P2610 set? | Go to Step 5 | Go to Diagnostic Aids |
Did you find and correct a condition? | Go to Step 6 | Go to Step 5 | |
5 | Replace the PCM. Refer to Control Module References for replacement, setup, and programming. 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 |
