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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P2147, P2148, P2150, or P2151 >> 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.
  2. It may take up to 2 min for all vehicle systems to power down.
  3. Disconnect the harness connector at the appropriate Q17 Fuel Injector.
  4. Ignition ON.
  5. Test for 4. 5 - 6. 5 V between the high voltage supply circuit terminal 1 and ground.
    • If less than 4. 5 V 
    1. Ignition OFF.
    2. Disconnect the X2 harness connector at the K20 Engine Control Module.
    3. Test for infinite resistance between the supply circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 Ω in the supply circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If greater than 6. 5 V 
    1. Ignition OFF.
    2. Disconnect the harness connector X2 at the K20 Engine Control Module, Ignition ON.
    3. Test for less than 1 V between the high voltage supply 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 between 4. 5 - 6. 5 V 
  6. Test for 0. 60 - 0. 80 V between the high voltage control circuit terminal 2 and ground.
    • If less than 0. 60 V 
    1. Ignition OFF.
    2. Disconnect the harness connector X2 at the K20 Engine Control Module.
    3. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If greater than 0. 80 V 
    1. Ignition OFF.
    2. Disconnect the harness connector X2 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 on the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • Go to next step: If between 0. 60 - 0. 80 V 
  7. Test or replace the appropriate Q17 Fuel Injector.
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