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Home >> Chevrolet >> 2023 >> Tahoe SSV >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (2 Of 5)) >> Diagnostic Information and Procedures >> DTC P034F, P0404, or P042E >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Verify a condition does not exist with the component: Q14A Exhaust Gas Recirculation Valve 1
    • Stuck
    • Debris on the component.
    • Coking
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  2. Ignition/Vehicle & All vehicle systems - Off
  3. Disconnect the electrical connector: Q14A Exhaust Gas Recirculation Valve 1
  4. Disconnect the electrical connector: K20 Engine Control Module
  5. Ignition - On/Vehicle - In Service Mode
  6. Test for less than 1 V between the test points: Control circuit terminal 5@Component harness & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit.
    • Go to next step: If less than 1 V
  7. Test for infinite resistance between the test points: Control circuit terminal 5@Component harness & Ground
    • If less than infinite resistance - Repair the short to ground on the circuit.
    • Go to next step: If infinite resistance
  8. Test for less than 2 ohms between the test points: Control circuit terminal 5@Component harness & The other end of the circuit@ Control module 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 less than 1 V between the test points: Control circuit terminal 4@Component harness & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit.
    • Go to next step: If less than 1 V
  10. Test for infinite resistance between the test points: Control circuit terminal 4@Component harness & Ground
    • If less than infinite resistance - Repair the short to ground on the circuit.
    • Go to next step: If infinite resistance
  11. Test for less than 2 ohms between the test points: Control circuit terminal 4@Component harness & The other end of the circuitk@Control module harness
    • If 2 ohms or greater - Repair the open/high resistance in the circuit.
    • Go to next step: If less than 2 ohms
  12. Replace the component: Q14A Exhaust Gas Recirculation Valve 1
  13. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Replace the component: K20 Engine Control Module

    • Go to next step: If the DTC is not set 
  14. All OK.
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