Circuit/System Testing

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

NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector : A38 Reductant Pump and Sensor Assembly
Ignition - On / Vehicle - In Service Mode
Test for less than 25 ohms between the test points : Low Reference circuit terminal 3 & Ground
- If 25 ohms or greater
1. Disconnect the electrical connector : K115 Reductant Control Module
2. Test for less than 2 ohms between the test points : Low Reference circuit terminal 3 @ Component harness & Terminal 14 X2 @ Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component : K115 Reductant Control Module
- Go to next step : If less than 25 ohms
Test for 4.8 to 5.2 V between the test points : 5 V Reference circuit terminal 5 & Ground
- If less than 4.8 V
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector : K115 Reductant Control Module
3. Test for infinite resistance between the test points : 5 V Reference 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 less than 2 ohms between the test points : 5 V Reference circuit terminal 5 @ Component harness & Terminal 12 X2 @ Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component : K115 Reductant Control Module
- If greater than 5.2 V
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector : K115 Reductant Control Module
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points : 5 V Reference circuit terminal 5 @ Component harness & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - If less than 1 V - Replace the component : K115 Reductant Control Module
- Go to next step : If between 4.8 and 5.2 V
Verify the scan tool parameter : Reductant Pressure Sensor = 0 V
- If greater than 0 V
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector : K115 Reductant Control Module
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points : Signal circuit terminal 4 @ Component harness & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - If less than 1 V - Replace the component : K115 Reductant Control Module
- Go to next step : If 0 V
Connect a 3 A fused jumper wire between the test points : Signal circuit terminal 4 & 5 V Reference circuit terminal 5
Verify the scan tool parameter : Reductant Pressure Sensor = Greater than 4.5 V
- If 4.5 V or less
1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
2. Disconnect the electrical connector : K115 Reductant Control Module
3. Test for infinite resistance between the test points : Signal circuit terminal 4 @ 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 : Signal circuit terminal 4 @ Component harness & Terminal 13 X2 @ Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component : K115 Reductant Control Module
- Go to next step : If greater than 4.5 V
Test or replace the component : A38 Reductant Pump and Sensor Assembly