Circuit/System Testing

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

Ignition OFF. Test the reductant system for contamination. Refer to Contaminants-in-Diesel Exhaust Fluid Diagnosis .
- If any conditions are found
  Repair as necessary
- Go to next step: If no conditions are found
Ignition On. Using scan tool command the Reductant System Leak Test On.
Verify that the system is able to build up and reach the reductant pressure sensor parameter greater than 450 kPa.
- If less than the specified range
1. Command the Reductant Pump to 50% with a scan tool.
2. Verify that the desired Reductant Pump Speed and actual Reductant Pump Speed parameters are equal.
  - If not equal
    Refer to DTC P105A
  - Go to next step: If equal
- Go to next step: If within the specified range
Verify there are no leaks, kinks or restrictions in the reductant lines
- If any condition is found
  Repair as necessary
- Go to next step: If no conditions are found
Verify the Reductant Injection Quantity Test passes.
- If the test does not pass
  Repair as instructed per the test, then continue to the next step.
- Go to next step: If the test passes
Verify none of the conditions listed below exist:
- Leaking fuel injectors. Refer to Fuel Injector Balance Test with Scan Tool .
- Engine oil consumption. Refer to Oil Consumption Diagnosis .
- Engine coolant consumption. Refer to Coolant in Combustion Chamber .
- An engine mechanical condition. Refer to Symptoms - Engine Mechanical .
- If any condition is found
  Repair as necessary
- Go to next step: If no condition is found
Replace SCR Catalyst.