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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 P1043, P1044, P208A or P208D: Reductant Pump Control Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition Off and all vehicle systems Off, disconnect harness connector at the G33 Reductant Pump Motor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 Ω between the low reference circuit terminal 4 and ground.
    • If greater than 5 Ω 
    1. Disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If less than 5 Ω 
  3. Test for less than 1 V between the G33 Reductant Pump Motor supply voltage circuit terminal 3 and ground.
    • If greater than 1 V 
    1. Disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 1 V on the supply voltage circuit end to end.
      • If greater than 1 V, repair the short to voltage in the circuit.
      • If less than 1 V, replace the K20 Engine Control Module
    • If less than 1 V 
  4. Ignition On.
  5. Test for battery voltage between the G33 Reductant Pump Motor supply voltage circuit terminal 3 and ground.
    • If less than battery voltage 
    1. Ignition Off, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance in the supply voltage circuit to ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance
    1. Test for less than 2 Ω in the 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 K20 Engine Control Module.
    • If battery voltage is present 
  6. Test for 2.5-4.5 V between the G33 Reductant Pump Motor control circuit terminal 5 and ground.
    • If less than 2.5 V 
    1. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If greater than 4.5 V 
    1. Ignition Off, disconnect the harness connector at the K20 Engine Control Module.
    2. Ignition On.
    3. Test for less than 1 V between the control circuit and ground.
    • If 1 V or greater, repair the short to voltage on the circuit.
    • If less than 1 V, replace the K20 Engine Control Module.
    • If between 2.5-4.5 V 
  7. Connect a test lamp between the G33 Reductant Pump Motor control circuit terminal 5 and the G33 Reductant Pump Motor supply voltage circuit terminal 3.
  8. Verify the test lamp illuminates or flashes when commanding the reductant pump to 80% with a scan tool.
    • If the test lamp does not illuminate or flash 

      Replace the K20 Engine Control Module.

    • If the test lamp does illuminate or flash 
  9. Replace the G33 Reductant Pump.
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