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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.0L (LUZ) Diesel - DTC P0430 To DTC P2080) >> Diagnostic Information and Procedures >> DTC P0671, P0672, P0673 or P0674: Cylinder Glow Plug Control Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE: If a glow plug is replaced and the tip is missing or burned off, the cylinder head must be removed and all debris be cleaned out of the cylinder.
  1. Ignition ON.
  2. Glow plugs not commanded ON, verify that a test lamp does not illuminate between the appropriate Glow Plug Supply Voltage circuit terminal 1 and ground.
    • If the test lamp illuminates 
    1. Ignition OFF, disconnect the X1 harness connector at the K34 Glow Plug Control Module
    2. Ignition ON.
    3. Test for less than 1 V between the appropriate glow plug supply voltage circuit and ground
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V, replace the K34 Glow Plug Control Module.
    • If the test lamp does not illuminate 
  3. Command the Glow Plugs ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp does not turn ON and OFF 
    1. Ignition OFF, disconnect the X2 harness connector at the K34 Glow Plug Control Module.
    2. Test for infinite resistance between the appropriate glow plug supply voltage circuit and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance.
    3. Test for less than 2 Ω in the glow plug supply voltage circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K34 Glow Plug Control Module.
    • If the test lamp turns ON and OFF 
  4. Replace the appropriate E12 Glow Plug.
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