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Home >> Saturn >> 2001 >> SC2 Automatic, MP6 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0403: EGR Solenoid Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Turn ignition on, engine off. Using scan tool, monitor EGR SOLENOID - OPEN or EGR SOLENOID - HIGH VOLT test. If scan tool indicates TEST FAIL, go to next step. If scan tool does not indicate TEST FAIL, problem is intermittent. See DIAGNOSTIC AIDS .
  2. Disconnect EGR solenoid harness connector. See Figure or Figure . Connect a test light between EGR solenoid harness connector terminals "A" (Light Blue wire) and "E" (Red wire). See Figure. Using scan tool, monitor EGR SOLENOID - OPEN or EGR SOLENOID - HIGH VOLT test. If scan tool does not indicate TEST PASS, go to next step. If scan tool indicates TEST PASS, check for loose connections or faulty EGR solenoid. Repair or replace as necessary.
  3. Using DVOM, check voltage on EGR solenoid harness connector terminal "E" (Red wire). If ignition voltage is present, go to next step. If ignition voltage is not present, check for open in circuit or loose connections. Repair as necessary. If circuit or terminal connector is okay, replace PCM.
    4. NOTE: Voltage from PCM on Red wire when EGR solenoid is commanded off is normal. This voltage normally will not light a test light.
  4. Connect a test between battery voltage and EGR solenoid harness connector terminal "A" (Light Blue wire). If test light illuminates, check for short to voltage in circuit No. 1676 (Red wire) between EGR and PCM. If test light does not illuminate, check for open in Light Blue wire or loose connections. Repair as necessary. If circuit or terminal connector is okay, replace PCM.
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