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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 279 (Engine Controls And Fuel - 2.0L (LTG) - DTC P0300 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P1516, P2101, P2119, or P2176: Throttle Actuator Control (TAC) Module/Throttle Position >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle Off
  2. Verify the following conditions do not exist:
      WARNING:

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

    • The throttle blade has not reached the closed position after the engine has been turned off.
    • The throttle blade is not closed by the spring.
    • The throttle blade is binding in open or closed position.
    • If a condition exists 

      Replace the component: Q38 Throttle Body

    • 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 5 to 8 V between the test points:
    • Control circuit terminal 1/A & Ground
    • Control circuit terminal 2/B & Ground
    • If less than 5 V 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: X2 @ K20 Engine Control Module
    3. Test for infinite resistance between the test points:
      • Control circuit terminal 1/A @ Component harness & Ground
      • Control circuit terminal 2/B @ Component harness & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points:
      • Control circuit terminal 1/A @ Component harness & The other end of the circuit @ Control module harness
      • Control circuit terminal 2/B @ Component harness & The other end of the circuit @ Control module harness
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K20 Engine Control Module
    • If greater than 8 V 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: X2 @ 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/A @ Component harness & Ground
      • Control circuit terminal 2/B @ 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
    • If between 5 and 8 V 
  6. Ignition/Vehicle Off
  7. Disconnect the electrical connector: X2 @ K20 Engine Control Module
  8. Test for less than 2 Ω between the test points:
    • Control circuit terminal 1/A @ Component harness & The other end of the circuit @ Control module harness
    • Control circuit terminal 2/B @ Component harness & The other end of the circuit @ Control module harness
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2 Ω 
  9. Test or replace the component: Q38 Throttle Body
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