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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P205B - P2BAA) And Symptoms) >> Diagnostic Information And Procedures >> DTC P208A, P208C, 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 the harness connector at the A38 Reductant Pump and Sensor Assembly. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 15 and ground.
    • If 10 Ω or greater 
    1. Ignition Off.
    2. Test for less than 2 Ω between A38 Reductant Pump and Sensor Assembly harness connector terminal 15 and K115 Reductant Control Module X2 harness connector terminal 5.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K115 Reductant Control Module.
    • Go to next step: If less than 10 Ω 
  3. Disconnect the X2 harness connector at the K115 Reductant Control Module.
  4. Test for less than 2 Ω between the control circuit terminals listed below:
    • A38 Reductant Pump and Sensor Assembly harness connector terminal 16 and K115 Reductant Control Module X2 harness connector terminal 1
    • A38 Reductant Pump and Sensor Assembly harness connector terminal 8 and K115 Reductant Control Module X2 harness connector terminal 2
    • A38 Reductant Pump and Sensor Assembly harness connector terminal 7 and K115 Reductant Control Module X2 harness connector terminal 3
    • If greater than 2 Ω 

      Repair the open/high resistance in the appropriate circuit.

    • Go to next step: If less than 2 Ω 
  5. Ignition Off, test for infinite resistance between each control circuits listed above and ground.
    • If less than infinite resistance 

      Repair the short to ground at the appropriate circuit.

    • Go to next step: If infinite resistance 
  6. Ignition ON, test for less than 1 V between each control circuits listed above and ground.
    • If 1 V or greater 

      Repair the short to voltage on the appropriate circuit.

    • Go to next step: If less than 1 V 
  7. Replace the A38 Reductant Pump and Sensor Assembly.
  8. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  9. Verify the DTC does not set.
    • If the DTC sets 

      Replace the K115 Reductant Control Module

    • Go to next step: If the DTC does not set 
  10. All OK.
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