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Home >> Chevrolet >> 2023 >> Camaro ZL1, 2D Convertible, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 23 (Engine Controls And Fuel - 3.6L - 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. WARNING:

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

  2. Verify a condition does not exist with the component: Blade@Q38 Throttle Body
    • 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 0 V, but less than 2.5 V between the test points: Control circuit terminal 1 & Control circuit terminal 2
    • If 0 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 2.5 V or greater 
    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 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 greater than 0 V and less than 2.5 V 
  6. Perform the scan tool function: Clear DTCs
  7. Ignition/Vehicle & All vehicle systems - Off - It may take up to 2 min for all vehicle systems to power down before an accurate test can be performed.
  8. Use the special tool: EL-44603 Injector Test Lamp
  9. Connect the tool between the test points: Control circuit terminal 1 & Control circuit terminal 2
  10. Ignition - On/Vehicle - In Service Mode
  11. Verify the test lamp flashes - Once
    • If the test lamp does not flash 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector: K20 Engine Control Module
    3. 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
    • Go to next step: If the test lamp flashes 
  12. Test or replace the component: Q38 Throttle Body
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