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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (P0351 - P26C8) And Symptoms) >> Diagnostic Information And Procedures >> DTC P1516, P2101, P2119, Or P2176: Throttle Actuator Control (TAC) >> 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:
      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

    • 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 6 to 9 V between the test points:
    • Control circuit terminal 1 & Ground
    • Control circuit terminal 2 & Ground
    • If less than 6 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 @Component harness & Ground
      • Control circuit terminal 2 @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 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 
    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 @Component harness & Ground
      • Control circuit terminal 2 @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 6 and 9 V 
  6. Ignition/Vehicle - Off
  7. Disconnect the electrical connector: X2 @K20 Engine Control Module
  8. 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 
  9. Test or replace the component:Q38 Throttle Body
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