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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 20 (Engine Controls And Fuel - 4.3L (LV1) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0201-P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, or P0277 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle - Off
  2. Disconnect the appropriate electrical connector : Q17 Fuel Injector
  3. Ignition - On / Vehicle - In Service Mode
  4. Test for 4.5 to 6.5 V between the test points : Control circuit terminal 1 & Ground
    • If less than 4.5 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector : X3 @ 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 less than 2 ohms between the test points : Control circuit terminal 1 @ Component harness &
      • { Q17A Fuel Injector 1 } Terminal 72 @ Control module harness
      • { Q17B Fuel Injector 2 } Terminal 71 @ Control module harness
      • { Q17C Fuel Injector 3 } Terminal 67 @ Control module harness
      • { Q17D Fuel Injector 4 } Terminal 66 @ Control module harness
      • { Q17E Fuel Injector 5 } Terminal 70 @ Control module harness
      • { Q17F Fuel Injector 6 } Terminal 68 @ 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 6.5 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector : X3 @ 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 4.5 and 6.5 V 
  5. Test for 0.60 to 0.80 V between the test points : Control circuit terminal 2 @ Component harness & Ground
    • If less than 0.60 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector : X3 @ 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.
      • Go to next step : If infinite resistance
    4. Test for less than 2 ohms between the test points : Control circuit terminal 2 @ Component harness &
      • { Q17A Fuel Injector 1 } Terminal 52 @ Control module harness
      • { Q17B Fuel Injector 2 } Terminal 51 @ Control module harness
      • { Q17C Fuel Injector 3 } Terminal 47 @ Control module harness
      • { Q17D Fuel Injector 4 } Terminal 46 @ Control module harness
      • { Q17E Fuel Injector 5 } Terminal 50 @ Control module harness
      • { Q17F Fuel Injector 6 } Terminal 48 @ 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 0.80 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector : X3 @ 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 0.60 and 0.80 V 
  6. Test or replace the component : Q17 Fuel Injector
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