Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
- Ignition/Vehicle - Off
- Verify a condition does not exist with the component : Blade @ Q20 Intake Air Flow Valve
- Binding or Sticking @ Open/Close - Position
- Closed @ Engine Off
- Coking/Debris/Dirty/Ice/Visible Damage
- Open/Close - Without spring pressure
WARNING:Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.
- If a condition exists
Replace the component : Q20 Intake Air Flow Valve
- Go to next step : If no condition exists
- Disconnect the electrical connector : Q20 Intake Air Flow Valve
- Ignition - On / Vehicle - In Service Mode
- Test for 1.5 to 2.5 V between the test points : Control circuit terminal 1 & Ground
- If less than 1.5 V
- Ignition/Vehicle - Off
- Disconnect the electrical connector : X2 @ K20 Engine Control Module
- Test for infinite resistance between the test points : Control circuit terminal 1 @ Component harness & Ground
- If less than infinite resistance - Repair the short to ground on the circuit.
- Go to next step : If infinite resistance
- Test for infinite resistance between the test points : Control circuit terminal 1 & Control circuit terminal 2
- If less than infinite resistance - Repair the short between the circuits.
- Go to next step : If infinite resistance
- 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
- 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 2.5 V
- Ignition/Vehicle - Off
- Disconnect the electrical connector : X2 @ K20 Engine Control Module
- Ignition - On / Vehicle - In Service Mode
- Test for less than 1 V between the test points : Control circuit terminal 1 @ 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 1.5 and 2.5 V
- Verify a test lamp does not turn On between the test points : Control circuit terminal 2 & B+
- If the test lamp turns On
- Ignition/Vehicle - Off Remove - Test Lamp
- Disconnect the electrical connector : X2 @ K20 Engine Control Module
- Test for infinite resistance between the test points : Control circuit terminal 1 @ Component harness & Ground
- If less than infinite resistance - Repair the short to ground on the circuit.
- If infinite resistance - Replace the component : K20 Engine Control Module
- Go to next step : If the test lamp does not turn On
- Verify a test lamp does not turn On between the test points : Control circuit terminal 2 & Ground
- If the test lamp turns On
- Ignition/Vehicle - Off
- Disconnect the electrical connector : X2 @ K20 Engine Control Module
- Ignition - On / Vehicle - In Service Mode
- Test for less than 1 V between the test points : 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 the test lamp does not turn On
- Test for 1.5 to 2.5 V between the test points : Control circuit terminal 1 & Control circuit terminal 2
- If not between 1.5 and 2.5 V
- Ignition/Vehicle - Off
- Disconnect the electrical connector : X2 @ K20 Engine Control Module
- Test for less than 2 ohms between the test points : 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 between 1.5 and 2.5 V
- Test or replace the component : Q20 Intake Air Flow Valve
NOTE:
Disconnecting the component electrical connector causes additional DTCs to set.