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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 22 (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 variant/trim than selected.
    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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