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Home >> Pontiac >> 2007 >> Vibe Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - DTC P0452 To DTC P2138 >> DTC P0657 >> Test Description
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Test Description

The numbers below refer to the step numbers in the diagnostic table.

  1. 1:  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.
  2. 2:  This step determines if the fault is present. Replace the PCM if DTC P0657 sets again.
DTC P0657

Step Action Yes No
1  Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
IMPORTANT: If the vehicle does not start, crank the engine in order to allow the DTC to set.
  1. Install a scan tool.
  2. Clear the scan tool information.
  3. Turn OFF the ignition, in order to initialize the powertrain control module (PCM).
  4. Turn ON the ignition.
  5. Wait 10 seconds and check for DTCs.
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
  1. Start the engine.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
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?		 Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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