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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P105A >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector : A38 Reductant Pump and Sensor Assembly
  3. Test for less than 10 ohms between the test points: Low Reference terminal 15 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector : K115 Reductant Control Module
    2. Test for less than 2 ohms between the test points: Low Reference terminal 15 @ Component harness & Terminal 5 X2 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K115 Reductant Control Module
    • Go to next step: If less than 10 ohms 
  4. Disconnect the electrical connector : X2 @ K115 Reductant Control Module
  5. Test for less than 2 ohms between the test points:
    • Control circuit terminal 16 @ Component harness & Terminal 1 X2 @ Control module harness
    • Control circuit terminal 8 @ Component harness & Terminal 2 X2 @ Control module harness
    • Control circuit terminal 7 @ Component harness & Terminal 3 X2 @ Control module harness
    • If 2 ohms or greater 

      Repair the open/high resistance in the circuit:

    • Go to next step: If less than 2 kohms 
  6. Test for infinite resistance between the test points:
    • Control circuit terminal 16 @ Component harness & Ground
    • Control circuit terminal 8 @ Component harness & Ground
    • Control circuit terminal 7 @ Component harness & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit:

    • Go to next step: If infinite resistance 
  7. Ignition - On / Vehicle - In Service Mode
  8. Test for less than 1 V between the test points:
    • Control circuit terminal 16 @ Component harness & Ground
    • Control circuit terminal 8 @ Component harness & Ground
    • Control circuit terminal 7 @ Component harness & Ground
    • If 1 V or greater 

      Repair the short to voltage on the circuit:

    • Go to next step: If less than 1 V 
  9. Replace the component: A38 Reductant Pump and Sensor Assembly
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