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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Engine Controls - Self-Diagnostics - 3.5L) >> Diagnostic Tests >> DTC P0403: EGR Solenoid Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition on, with engine off. Using scan tool, command EGR from zero to 100 percent. If EGR position sensor remains close to desired EGR position at all commanded positions, go to next step. If EGR position sensor does not remain close to desired EGR position at all commanded positions, go to step  4.
  3. Using scan tool, observe and record FREEZE FRAME/FAILURE RECORDS data for this DTC. Turn ignition off for 30 seconds. Start engine. Operate vehicle within conditions for running the DTC or as close to recorded FREEZE FRAME/FAILURE RECORDS data as possible. See CONDITIONS FOR RUNNING DTC . If DTC resets, go to next step. If DTC does not reset, fault may be intermittent. See INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  4. Turn ignition off. Disconnect EGR harness connector. Turn ignition on, with engine off. Probe EGR solenoid high control circuit with a test light connected to a good ground. With scan tool, command EGR between 0 percent and 10 percent. Does test light turn ON and OFF with each command? If yes, go to next step. If no, go to step  6.
  5. Connect a test light between the high control circuit of solenoid and low control circuit of solenoid harness connector. With scan tool, command EGR between 0 and 10 percent. Does test light turn ON and OFF with each command? If yes, go to step  10. If no, go to step  9.
  6. If test light remains on with each command, go to step  8. If test light does not remain on with each command, go to next step.
  7. Test EGR solenoid high control circuit for a short to ground or an open. If any problems are found, repair as necessary. After repairs, go to step  14. If no problems are found, go to step  11.
  8. Test the EGR solenoid high control circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  14. If no, go to step  11.
  9. Test the EGR solenoid low control circuit for an open or high resistance. Did you find and correct the condition? If yes, go to step  14. If no, go to step  11.
  10. Check for poor connections at EGR valve connector. Repair connector as necessary. After repairs, go to step  14. If connector is okay, go to step  12.
  11. Check for poor connections at PCM connectors. Repair connectors as necessary. After repairs, go to step  14. If connectors are okay, go to step  13.
  12. Replace EGR valve. After repairs, go to step  14.
  13. Replace PCM. Program replacement PCM. See PROGRAMMING . After repairs, go to next step.
  14. Turn ignition off. Reconnect all disconnected connectors. Turn ignition on. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within conditions for running the DTC. See CONDITIONS FOR RUNNING DTC . If DTC runs and passes, go to next step. If DTC resets, go to step  2.
  15. Using scan tool, check for any other DTCs that are set. If no other DTCs are set, system is okay. If any other DTCs are set, repair DTCs as necessary. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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