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Home >> Chevrolet >> 2000 >> Tracker 4D Utility, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P0403: Exhaust Gas RECIRCULATION Solenoid Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Disconnect EGR valve harness connector. Turn ignition on, with engine off. Connect a test light between ground and EGR valve harness connector terminal No. 2 (ignition positive voltage circuit). Connect test light between ground and EGR valve harness connector terminal No. 5 (ignition positive voltage circuit). If test light illuminates at both terminals, go to next step. If test light does not illuminate at both terminals, go to step  7.
  3. Using DVOM, check resistance between the following terminals at EGR valve harness connector.
    • Terminals No. 1 (EGR coil control circuit) and No. 2 (ignition positive voltage circuit).
    • Terminals No. 3 (EGR coil control circuit) and No. 2 (ignition positive voltage circuit).
    • Terminals No. 4 (EGR coil control circuit) and No. 5 (ignition positive voltage circuit).
    • Terminals No. 6 (EGR coil control circuit) and No. 5 (ignition positive voltage circuit).

    Resistance should be 20-24 ohms at 68°F (20°C). Check resistance between EGR valve body and harness connector terminals No. 2 (ignition positive voltage circuit) and No. 5 (ignition positive voltage circuit). Resistance should be infinite. If resistance is as specified at all terminals, go to next step. If resistance is not as specified at any terminal, go to step  8.

  4. Reconnect EGR valve harness connector. Install scan tool. Start engine. Warm engine to normal operating temperature. Using scan tool, clear DTCs. Using scan tool, gradually command EGR valve open to 100 percent. If engine runs rough or stalls, go to DIAGNOSTIC AIDS . If engine does not run rough or stall, go to next step.
  5. Remove EGR valve. Check for mechanical damage. Check EGR passages for obstruction. Repair as necessary. After repairs, go to step  10. If EGR valve and passages are okay, go to next step.
  6. Check for open or short in EGR coil control circuits between EGR valve and PCM. Repair as necessary. After repairs, go to step  10. If circuits are okay, go to step  9.
  7. Repair open in ignition positive voltage circuit between main relay and EGR valve. After repairs, go to step  10.
  8. Replace EGR valve. After replacing EGR valve, go to step  10.
  9. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  10. After repairs, clear DTCs. Operate vehicle within FREEZE FRAME conditions that set DTC. Check for DTCs. If no DTCs are stored, repair is complete. If any DTCs are stored, diagnose DTC(s).
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