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Home >> Chevrolet >> 2021 >> Trailblazer RS, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 1.0L (L4B L4F L4G LIJ) Or 1.2L (L4H L4K LIF LIH) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P1516, P2101, P2119, or P2176 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle - Off
  2. Verify a condition does not exist with the component: Blade @ Q38 Throttle Body
      WARNING:

      Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.

    • Binding or Sticking @ Open/Closed - Position
    • Open @ Engine Off
    • Closed - Without spring pressure
    • If a condition exists 

      Replace the component: Q38 Throttle Body

    • 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: Q38 Throttle Body
  4. Ignition - On/Vehicle - In Service Mode
  5. Test for greater than 9 V between the test points:
    • Control circuit terminal 1 & Ground
    • Control circuit terminal 2 & Ground
    • If less than 9 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 1 @ Component harness & Ground
      • 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 1 @ Component harness & The other end of the circuit @ Control module harness
      • Control circuit terminal 2 @ 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 9 V 
  6. Ignition/Vehicle - Off
  7. Disconnect the appropriate electrical connector: @ K20 Engine Control Module
  8. Ignition - On/Vehicle - In Service Mode
  9. Test for less than 1 V between the test points:
    • Control circuit terminal 1 @ Component harness & Ground
    • Control circuit terminal 2 @ 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. Ignition/Vehicle - Off
  11. Test for less than 2 ohms between the test points:
    • Control circuit terminal 1 @ Component harness & The other end of the circuit @ Control module harness
    • Control circuit terminal 2 @ 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 
  12. Test or replace the component: Q38 Throttle Body
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