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Home >> Chevrolet >> 2023 >> Tahoe SSV >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (4 Of 5)) >> Diagnostic Information and Procedures >> DTC P2006, P20F8, or P295A >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle - Off
  2. Verify the following conditions do not exist: Blade @ Q22 Intake Manifold Tuning Solenoid Valve
    • Binding or Sticking @ Open/Close - Position
    • Closed @ Engine Off
    • Coking/Debris/Dirty/Visible Damage
    • Open/Close - Without spring pressure
    • If a condition exists - Repair or replace as necessary 
    • Go to next step: If no condition exists 
    3. NOTE:

    Disconnecting the component electrical connector causes additional DTCs to set.

  3. Disconnect the electrical connector: Q22 Intake Manifold Tuning Solenoid Valve
  4. Ignition - On/Vehicle - In Service Mode
  5. Test for 8 to 10 V between the test points:
    • Control circuit terminal 4 @ & Ground
    • Control circuit terminal 5 @ & Ground
    • If less than 8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector: K20 Engine Control Module
    3. Test for infinite resistance between the test points:
      • Control circuit terminal 4 @ Component harness & Ground
      • 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
    4. Test for infinite resistance between the test points: Control circuit terminal 4 & Control circuit terminal 5@ Component harness
      • If less than infinite resistance - Repair the short between the circuits.
      • Go to next step: If infinite resistance
    5. Test for less than 2 ohms between the test points:
      • Control circuit terminal 4 @Component harness & The other end of the circuit @ Control module harness
      • 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.
      • If less than 2 ohms - Replace the component: K20 Engine Control Module
    • If greater than 10 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector: 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 4 @ Component harness & Ground
      • Control circuit terminal 5 @ 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 8 and 10 V 
  6. Connect a test lamp between the test points: Control circuit terminal 4 & Control circuit terminal 5@ Component harness
  7. Perform the scan tool control function: Intake Manifold Runner Control Valve - Increase & Decrease
  8. Verify the test lamp turns On and Off.
    • If the test lamp does not turn On and Off 
    1. Ignition/Vehicle - Off Remove - Test Lamp
    2. Disconnect the appropriate electrical connector: K20 Engine Control Module
    3. Test for less than 2 ohms between the test points:
      • Control circuit terminal 4 @ Component harness & The other end of the circuit @ Control module harness
      • 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.
      • If less than 2 ohms - Replace the component: K20 Engine Control Module
    • Go to next step: If the test lamp turns On and Off 
  9. Test or replace the component: Q22 Intake Manifold Tuning Solenoid Valve
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