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Home >> Pontiac >> 2001 >> Aztek Base, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel System (Diesel) >> Glow Plug System Diagnosis
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Glow Plug System Diagnosis

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing powertrain diagnostic system check, go to next step.
  2. Retrieve DTCs. If DTC P0117, P0118 and/or P0380 is not set, go to next step. If DTC P0117, P0118 and/or P0380 is set, perform appropriate DTC test. See appropriate SELF-DIAGNOSTICS article.
  3. Turn ignition off. Disconnect all glow plug harness connectors. Using a test light connected to battery voltage, probe each glow plug spade terminal at glow plugs. If test light illuminates at each glow plug, go to next step. If test light does not illuminate at each glow plug, go to step  9.
  4. Ensure all glow plug harness connectors are still disconnected. Turn ignition on with engine off. Using scan tool, command glow plugs on. Using a test light connected to ground, probe each glow plug harness connector terminal. If test light illuminates at each glow plug harness connector, go to next step. If test light does not illuminate at each glow plug harness connector, go to step  10.
  5. Using scan tool, command glow plugs off. Using a test light connected to ground, probe each glow plug harness connector terminal. If test light illuminates at any glow plug harness connector, go to next step. If test light does not illuminate at any glow plug harness connector, go to step  11.
  6. Remove glow plug relay. Using scan tool, command glow plugs off. Using a test light connected to ground, probe each glow plug harness connector terminal. If test light illuminates at any glow plug harness connector, go to next step. If test light does not illuminate at any glow plug harness connector, go to step  8.
  7. Repair short to voltage in glow plug output circuit or glow plug signal circuit. After repairs, go to step  11.
  8. Replace glow plug relay. After repairs, go to step  11.
  9. Replace glow plugs that did not illuminate test light. After repairs, go to step  11.
  10. Repair open in glow plug circuit(s) that did not illuminate test light. After repairs, go to next step.
  11. Operate vehicle under conditions when problem was noted. If system does not operate properly, go to step  1.
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