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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (1 Of 3)) >> Diagnostic Information and Procedures >> DTC P0201-P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P1248, P1249, P124A, P124B, 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.

Test 1

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: X2 @ K20 Engine Control Module
  3. Test for infinite resistance between the test points:
    • {Q17A Fuel Injector 1} Control circuit terminal 4 & Ground
    • {Q17B Fuel Injector 2} Control circuit terminal 1 & Ground
    • {Q17C Fuel Injector 3} Control circuit terminal 2 & Ground
    • {Q17D Fuel Injector 4} Control circuit terminal 3 & Ground
    • If less than infinite resistance 
    1. Disconnect the appropriate electrical connector: Q17 Fuel Injector
    2. Test for infinite resistance between the test points:
      • {Q17A Fuel Injector 1} Control circuit terminal 4 @ Control module harness & Ground
      • {Q17B Fuel Injector 2} Control circuit terminal 1 @ Control module harness & Ground
      • {Q17C Fuel Injector 3} Control circuit terminal 2 @ Control module harness & Ground
      • {Q17D Fuel Injector 4} Control circuit terminal 3 @ Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for infinite resistance between the test points:
      • {Q17A Fuel Injector 1} Control circuit terminal 8 @ Control module harness & Ground
      • {Q17B Fuel Injector 2} Control circuit terminal 5 @ Control module harness & Ground
      • {Q17C Fuel Injector 3} Control circuit terminal 6 @ Control module harness & Ground
      • {Q17D Fuel Injector 4} Control circuit terminal 7 @ Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: Q17 Fuel Injector
    • Go to next step: If infinite resistance 
  4. Ignition - On / Vehicle - In Service Mode
  5. Test for less than 1 V between the test points:
    • {Q17A Fuel Injector 1} Control circuit terminal 4 & Ground
    • {Q17B Fuel Injector 2} Control circuit terminal 1 & Ground
    • {Q17C Fuel Injector 3} Control circuit terminal 2 & Ground
    • {Q17D Fuel Injector 4} Control circuit terminal 3 & Ground
    • If 1 V or greater 
    1. Disconnect the appropriate electrical connector: Q17 Fuel Injector
    2. Test for less than 1 V between the test points:
      • {Q17A Fuel Injector 1} Control circuit terminal 4 @ Control module harness & Ground
      • {Q17B Fuel Injector 2} Control circuit terminal 1 @ Control module harness & Ground
      • {Q17C Fuel Injector 3} Control circuit terminal 2 @ Control module harness & Ground
      • {Q17D Fuel Injector 4} Control circuit terminal 3 @ Control module harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Repair the short to voltage on the circuit:
      • {Q17A Fuel Injector 1} Control circuit terminal 8
      • {Q17B Fuel Injector 2} Control circuit terminal 5
      • {Q17C Fuel Injector 3} Control circuit terminal 6
      • {Q17D Fuel Injector 4} Control circuit terminal 7
    • Go to next step: If less than 1 V 
  6. Ignition/Vehicle - Off
  7. Disconnect the appropriate electrical connector: Q17 Fuel Injector
  8. Test for less than 2 ohms between the test points:
    • {Q17A Fuel Injector 1} Control circuit terminal 4 @ Control module harness & Control circuit terminal 1 @ Component harness
    • {Q17A Fuel Injector 1} Control circuit terminal 8 @ Control module harness & Control circuit terminal 2 @ Component harness
    • {Q17B Fuel Injector 2} Control circuit terminal 1 @ Control module harness & Control circuit terminal 1 @ Component harness
    • {Q17B Fuel Injector 2} Control circuit terminal 5 @ Control module harness & Control circuit terminal 2 @ Component harness
    • {Q17C Fuel Injector 3} Control circuit terminal 2 @ Control module harness & Control circuit terminal 1 @ Component harness
    • {Q17C Fuel Injector 3} Control circuit terminal 6 @ Control module harness & Control circuit terminal 2 @ Component harness
    • {Q17D Fuel Injector 4} Control circuit terminal 3 @ Control module harness & Control circuit terminal 1 @ Component harness
    • {Q17D Fuel Injector 4} Control circuit terminal 7 @ Control module harness & Control circuit terminal 2 @ Component harness
    • If 2 ohms or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 ohms 
  9. Verify a condition does not exist with the component: Q17 Fuel Injector - Refer to: Component Testing
    • If a condition exists 

      Replace the component: Q17 Fuel Injector

    • Go to next step: If no condition exists 
  10. Replace the component: K20 Engine Control Module

Test 2

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: X2 @ K20 Engine Control Module
  3. Test for infinite resistance between the test points:
    • {Q17A Fuel Injector 1} Control circuit terminal 4 & Ground
    • {Q17B Fuel Injector 2} Control circuit terminal 1 & Ground
    • {Q17C Fuel Injector 3} Control circuit terminal 2 & Ground
    • {Q17D Fuel Injector 4} Control circuit terminal 3 & Ground
    • If less than infinite resistance 
    1. Disconnect the appropriate electrical connector: Q17 Fuel Injector
    2. Test for infinite resistance between the test points:
      • {Q17A Fuel Injector 1} Control circuit terminal 4 @ Control module harness & Ground
      • {Q17B Fuel Injector 2} Control circuit terminal 1 @ Control module harness & Ground
      • {Q17C Fuel Injector 3} Control circuit terminal 2 @ Control module harness & Ground
      • {Q17D Fuel Injector 4} Control circuit terminal 3 @ Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for infinite resistance between the test points:
      • {Q17A Fuel Injector 1} Control circuit terminal 8 @ Control module harness & Ground
      • {Q17B Fuel Injector 2} Control circuit terminal 5 @ Control module harness & Ground
      • {Q17C Fuel Injector 3} Control circuit terminal 6 @ Control module harness & Ground
      • {Q17D Fuel Injector 4} Control circuit terminal 7 @ Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: Q17 Fuel Injector
    • Go to next step: If infinite resistance 
  4. Ignition - On / Vehicle - In Service Mode
  5. Test for less than 1 V between the test points:
    • {Q17A Fuel Injector 1} Control circuit terminal 4 & Ground
    • {Q17B Fuel Injector 2} Control circuit terminal 1 & Ground
    • {Q17C Fuel Injector 3} Control circuit terminal 2 & Ground
    • {Q17D Fuel Injector 4} Control circuit terminal 3 & Ground
    • If 1 V or greater 
    1. Disconnect the appropriate electrical connector: Q17 Fuel Injector
    2. Test for less than 1 V between the test points:
      • {Q17A Fuel Injector 1} Control circuit terminal 4 @ Control module harness & Ground
      • {Q17B Fuel Injector 2} Control circuit terminal 1 @ Control module harness & Ground
      • {Q17C Fuel Injector 3} Control circuit terminal 2 @ Control module harness & Ground
      • {Q17D Fuel Injector 4} Control circuit terminal 3 @ Control module harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Repair the short to voltage on the circuit:
      • {Q17A Fuel Injector 1} Control circuit terminal 8
      • {Q17B Fuel Injector 2} Control circuit terminal 5
      • {Q17C Fuel Injector 3} Control circuit terminal 6
      • {Q17D Fuel Injector 4} Control circuit terminal 7
    • Go to next step: If less than 1 V 
  6. Ignition/Vehicle - Off
  7. Disconnect the appropriate electrical connector: Q17 Fuel Injector
  8. Test for less than 2 ohms between the test points:
    • {Q17A Fuel Injector 1} Control circuit terminal 4 @ Control module harness & Control circuit terminal 1 @ Component harness
    • {Q17A Fuel Injector 1} Control circuit terminal 8 @ Control module harness & Control circuit terminal 2 @ Component harness
    • {Q17B Fuel Injector 2} Control circuit terminal 1 @ Control module harness & Control circuit terminal 1 @ Component harness
    • {Q17B Fuel Injector 2} Control circuit terminal 5 @ Control module harness & Control circuit terminal 2 @ Component harness
    • {Q17C Fuel Injector 3} Control circuit terminal 2 @ Control module harness & Control circuit terminal 1 @ Component harness
    • {Q17C Fuel Injector 3} Control circuit terminal 6 @ Control module harness & Control circuit terminal 2 @ Component harness
    • {Q17D Fuel Injector 4} Control circuit terminal 3 @ Control module harness & Control circuit terminal 1 @ Component harness
    • {Q17D Fuel Injector 4} Control circuit terminal 7 @ Control module harness & Control circuit terminal 2 @ Component harness
      • If 2 ohms or greater 

        Repair the open/high resistance in the circuit.

      • Go to next step: If less than 2 ohms 
  9. Test for infinite resistance between the test points: Control circuit terminal 1 @ Component harness & Control circuit terminal 2 @ Component harness
    • If less than infinite resistance 

      Repair the short between the circuits.

    • Go to next step: If infinite resistance 
  10. Verify a condition does not exist with the component: Q17 Fuel Injector - Refer to: Component Testing
    • If a condition exists 

      Replace the component: Q17 Fuel Injector

    • Go to next step: If no condition exists 
  11. Replace the component: K20 Engine Control Module

Test 3

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: X2 @ K20 Engine Control Module
  3. Disconnect the appropriate electrical connector: Q17 Fuel Injector
  4. Test for infinite resistance between the test points: Control circuit terminal 1 @ Component harness & Control circuit terminal 2 @ Component harness
    • If less than infinite resistance 

      Repair the short between the circuits.

    • Go to next step: If infinite resistance 
  5. Test or replace the component: Q17 Fuel Injector
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