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/Vehicle - In Service Mode
Perform the scan tool control function: 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 the scan tool parameter: Desired Reductant Pump Speed = Reductant Pump Speed
  - If not equal
    Refer to DTC P105A
  - If equal
    Refer to the next step
- Go to next step: If greater than 450 kPa (66 PSI)
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
Perform the scan tool control function: Reductant Injection Quantity Test
Verify the procedure/test passes.
- If the procedure/test does not pass
  Repair as necessary.
- Go to next step: If the procedure/test passes
Ignition/Vehicle - Off - For greater than 2 min
Engine - Running
Perform the scan tool control function: Reductant System Tamper Service Bay Test
Verify the procedure/test passes.
- If the test does not pass
  A condition with the system still exists. - Refer to step 1
- Go to next step: If the test passes
All OK.