Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.

Ignition/Vehicle - Off

NOTE:

Disconnecting the component electrical connector causes additional DTCs to set.

Disconnect the electrical connector: M128 Turbocharger Wastegate Actuator
Ignition - On/Vehicle - In Service Mode
Test for battery voltage between the test points:
- Control circuit terminal 4 & Ground
- Control circuit terminal 5 & Ground
- If not within 1 V of the battery voltage
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 4 @ Component harness & Ground
  - Control circuit terminal 5 @ 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 infinite resistance between the test points: Control circuit terminal 4 & Control circuit terminal 5
  - If less than infinite resistance - Repair the short between the circuits.
  - Go to next step: If infinite resistance
5. Test for less than 2 ohms between the test points:
  - Control circuit terminal 4 @ Component harness & The other end of the circuit @ Control module harness
  - Control circuit terminal 5 @ 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 within 1 V of the battery voltage
Connect a test lamp between the test points: Control circuit terminal 4 & Control circuit terminal 5
Clear the DTCs.
Engine - Idling
Verify a test lamp turns On between the test points: Control circuit terminal 4 & Control circuit terminal 5 - Momentarily
- If the test lamp does not turn On
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 4 @ Component harness & Ground
  - Control circuit terminal 5 @ 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
5. Ignition/Vehicle - Off
6. Test for less than 2 ohms between the test points:
  - Control circuit terminal 4 @ Component harness & The other end of the circuit @ Control module harness
  - Control circuit terminal 5 @ 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 the test lamp turns On
Test or replace the component: M128 Turbocharger Wastegate Actuator