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Home >> Chevrolet >> 2022 >> Tahoe SSV >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (2 Of 5)) >> Diagnostic Information and Procedures >> DTC P0403, P0490, P04FA, P1402, P1407, or P140F >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: Q14A Exhaust Gas Recirculation Valve 1
  3. Disconnect the electrical connector: K20 Engine Control Module
  4. Ignition - On / Vehicle - In Service Mode
  5. 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
  6. 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
  7. Test for less than 2 ohms between the test points: Control circuit terminal 5 @ Component harness & Terminal 22 X1 @ 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
  8. 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
  9. 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
  10. Test for less than 2 ohms between the test points: Control circuit terminal 4 @ Component harness & Terminal 20 X1 @ 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
  11. Replace the component: Q14A Exhaust Gas Recirculation Valve 1
  12. 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 
  13. All OK.
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