Description
The DTC P0657 sets when the powertrain control module (PCM) has determined that the control module has an internal fault in the ignition voltage supply circuit 1. The PCM performs continuous self checks of all internal circuits. The PCM provides ignition positive voltage to the throttle actuator control (TAC) motor on circuit 1. The DTC P0657 diagnostic monitors the internal voltage of circuit 1.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0657 Solenoid Control High Circuit Group 1
Condition for Running the DTC
| • | The ignition is ON. |
| • | DTC P0657 runs continuously once the above condition is met. |
Conditions for Setting the DTC
DTC P0657 sets when the internal voltage of the TAC motor ignition supply circuit is incorrect.
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 P0657 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 P0657 sets again.
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.
Does the scan tool indicate a DTC P0657? | Go to Step 3 | Go to Diagnostic Aids | |
3 | Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 4 | -- |
4 |
Does the DTC run and pass? | Go to Step 5 | Go to Step 2 |
5 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | System OK |
