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Home >> GMC >> 1994 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 6.5L Diesel >> Diagnostic Trouble Code Charts >> DTC 29 - Glow Plug Relay Circuit Fault >> Test

DTC 29 - Glow Plug Relay Circuit Fault: Test

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. This step determines if DTC 29 is the result of a hard failure.
  2. Scan tester may not display system voltage. It is important that the PCM is cycling voltage on and off indicating the PCM is okay.
  3. This step checks the relay feed circuit.
  4. This step checks the relay ground.
  5. This step will determine if an open is present in the glow plug relay control circuit.
  6. This step checks the relay and wiring.
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