Circuit/System Testing

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

Ignition/Vehicle - Off
Disconnect the electrical connector: Q61 Reductant Injector
Ignition - On/Vehicle - In Service Mode
Test for 2 to 3 V between the test points: Control circuit terminal 2 & Ground
- If less than 2 V
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector: X2@K20 Engine Control Module
3. 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.
  - Go to next step: If less than 2 ohms
4. Test for infinite resistance between the test points: Control circuit terminal 2@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
- If greater than 3 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 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
- If between 2 and 3 V
Ignition/Vehicle - Off
Connect a test lamp between the test points: Control circuit terminal 1 & Control circuit terminal 2@Component harness
Ignition - On/Vehicle - In Service Mode
Perform the scan tool control function: Reductant Injector - On
Verify the test lamp flashes
- If the test lamp is always Off
1. Ignition/Vehicle - Off & Remove - Test lamp
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
  - 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
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - Go to next step: If less than 2 ohms
5. Ignition - On/Vehicle - In Service Mode
6. 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 the test lamp flashes
Test or replace the component: Q61 Reductant Injector