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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 P16FA or P16FC >> 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.
  1. Ignition Off and all vehicle systems Off, it may take up to 2 min for all vehicle systems to power down. Disconnect the harness connector at the M103 Turbocharger Vane Position Actuator.
  2. Verify that the conditions listed below do not exist:
    • Damage or corrosion in the turbocharger wiring harness, terminals, or harness connector.
    • Binding or damaged turbocharger vane control actuator.
    • Binding or damaged turbocharger vanes.
    • If a condition exists 

      Repair as necessary.

    • Go to next step: If a condition does not exist 
  3. Ignition On, test for 1. 5 - 2. 5 V between the control open circuit terminal 1 and ground.
    • If less than 1. 5 V 
    1. Ignition Off, disconnect the X2 harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between control circuit terminal 1 and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • Go to next step: If infinite resistance.
    3. Test for infinite resistance between the motor control circuit terminals 1 and 2.
      • If less than infinite resistance, repair the short between the control circuits.
    4. Test for less than 2 Ω in the control circuit, end to end.
      • If 2 Ω or greater, repair open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If greater than 2. 5 V 
    1. Ignition Off, disconnect the X2 harness connector at the K20 Engine Control Module.
    2. Ignition On.
    3. Test for less than 1 V between the control circuit terminal 1 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.
    • Go to next step: If 1. 5 - 2. 5 V 
  4. Connect a test lamp between the control close circuit terminal 2 and B+.
  5. Ignition On, verify the test lamp does not illuminate.
    • If the test lamp illuminates 
    1. Ignition Off, remove the test lamp.
    2. Disconnect the X2 harness connector at the K20 Engine Control Module.
    3. Test for infinite resistance between control circuit terminal 2 and ground.
      • If less than infinite resistance, repair the short to ground in the control circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • Go to next step: If the test lamp does not illuminate 
  6. Connect a test lamp between the control close circuit terminal 2 and ground.
  7. Ignition On, verify the test lamp does not illuminate.
    • If the test lamp illuminates 
    1. Ignition Off, remove the test lamp.
    2. Disconnect the X2 harness connector at the K20 Engine Control Module, ignition On.
    3. Test for less than 1 V between the control circuit terminal 2 and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • Go to next step: If the test lamp does not illuminate 
  8. Remove the test lamp.
  9. Test for 1. 5 - 2. 5 V between the control open circuit terminal 1 and the control close circuit terminal 2.
    • If not within the specified range 
    1. Ignition Off, disconnect the X2 harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the control close circuit terminal 2, end to end.
      • If 2 Ω or greater, repair open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • Go to next step: If within the specified range 
  10. Test or replace the M103 Turbocharger Vane Position Actuator.
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