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Home >> GMC >> 1996 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Tests W/Codes - P Series (Gasoline) >> Diagnostic Trouble Codes >> DTC P0325 - Knock Sensor Module Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. If engine knock can be heard, repair mechanical problem before proceeding. Install scan tool. Operate vehicle within the conditions for setting this DTC. Using scan tool, monitor SPECIFIC DTC for DTC P0325. If scan tool indicates DTC P0325 FAILED THIS IGN?, go to step 4). If scan tool does not indicate DTC P0325 FAILED THIS IGN?, go to next step.
  3. Turn ignition on, with engine off. Using scan tool, review and record FAILURE RECORDS data. Operate vehicle within FAILURE RECORDS conditions. Using scan tool, monitor SPECIFIC DTC for DTC P0325. If scan tool indicates DTC P0325 FAILED THIS IGN?, go to next step. If scan tool does not indicate DTC P0325 FAILED THIS IGN?, see DIAGNOSTIC AIDS.
  4. Check KS signal circuit for incorrect routing near secondary wires and repair as necessary. If a problem was found, go to step 8). If a problem was not found, go to next step.
  5. Check if KS module is fully seated or incorrectly installed and repair as necessary. If a problem was found, go to step 8). If a problem was not found, go to next step.
  6. Replace KS module. Operate vehicle within the conditions for setting this DTC. Using scan tool, monitor SPECIFIC DTC for DTC P0325. If scan tool indicates DTC P0325 FAILED THIS IGN?, go to next step. If scan tool does not indicate DTC P0325 FAILED THIS IGN?, go to step 8).
  7. Replace VCM. Program replacement VCM using required equipment. After repair is completed, go to next step.
  8. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0325. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2).
  9. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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