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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (1 Of 3)) >> Diagnostic Information and Procedures >> DTC P0045, P0047, P0048, P169E, or P169F >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle - Off
    2. NOTE:

    Disconnecting the component electrical connector causes additional DTCs to set.

  2. Disconnect the electrical connector : M103 Turbocharger Vane Position Actuator
  3. Ignition - On / Vehicle - In Service Mode
  4. Test for 1.5 to 2.5 V between the test points : Control circuit terminal 1 & Ground
    • If less than 1.5 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector : K20 Engine Control Module
    3. Test for infinite resistance between the test points : Control circuit terminal 1 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step : If infinite resistance
    4. Test for infinite resistance between the test points : Control circuit terminal 1 & Control circuit terminal 2
      • If less than infinite resistance - Repair the short between the circuits.
      • Go to next step : If infinite resistance
    5. Test for less than 2 ohms between the test points : Control circuit terminal 1 @ Component harness & The other end of the circuit @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component : K20 Engine Control Module
    • If greater than 2.5 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector : K20 Engine Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points : Control circuit terminal 1 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component : K20 Engine Control Module
    • Go to next step : If between 1.5 and 2.5 V 
  5. Connect a test lamp between the test points : Control circuit terminal 2 @ Component harness & B+
  6. Ignition - On / Vehicle - In Service Mode
  7. Verify the test lamp does not turn On.
    • If the test lamp turns On 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector : K20 Engine Control Module
    3. Test for infinite resistance between the test points : Control circuit terminal 2 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component : K20 Engine Control Module
    • Go to next step : If the test lamp does not turn On 
  8. Test for 1.5 to 2.5 V between the test points : Control circuit terminal 1 & Control circuit terminal 2
    • If less than 1.5 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector : K20 Engine Control Module
    3. Test for less than 2 ohms between the test points : Control circuit terminal 2 @ Component harness & The other end of the circuit @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component : K20 Engine Control Module
    • If greater than 2.5 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector : K20 Engine Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points : Control circuit terminal 2 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component : K20 Engine Control Module
    • Go to next step : If between 1.5 and 2.5 V 
  9. Test or replace the component : M103 Turbocharger Vane Position Actuator
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