Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
- Ignition and Start Signal - Off
- Verify the condition does not exist: Contamination - Emission Reduction Fluid - Refer to: Contaminants-in-Diesel Exhaust Fluid Diagnosis
- If a condition exists
Repair or replace as necessary
- Go to next step: If no condition exists
- If a condition exists
- Perform the scan tool control function: Reductant System Leak Test
Verify the condition does not exist: Hoses / Lines - Leaking
- If a condition exists
Repair or replace as necessary
- Go to next step: If no condition exists
- If a condition exists
- Remove the component: Q61 Reductant Injector - Leave the reductant line and the electrical connector connected.
- Place the injector into a suitable container.
- Perform the scan tool control function: Reductant System Leak Test
Verify the condition does not exist: Reductant Injector - Leaking
- If a condition exists
Replace the component: Q61 Reductant Injector
- Go to next step: If no condition exists
- If a condition exists
- Perform the scan tool control function: Reductant System Leak Test
Verify the scan tool parameter: Reductant Pressure = 450 to 550 kPa (65 to 80 PSI)
- If not between 450 and 550 kPa (65 and 80 PSI)
Replace the component: A38 Reductant Pump and Sensor Assembly
- Go to next step: If between 450 and 550 kPa (65 and 80 PSI)
- If not between 450 and 550 kPa (65 and 80 PSI)
- Verify there are no leaks, kinks or restrictions in the reductant lines
- If a condition exists
Repair or replace as necessary
- Go to next step: If no condition exists
- If a condition exists
- Perform the scan tool control function: Reductant Fluid Injector Quantity Test
.
- If the procedure/test does not pass
Repair or replace as necessary
- Go to next step: If the procedure/test passes
- If the procedure/test does not pass
- Disconnect the electrical connector: Q61 Reductant Fluid Injector
- Run the engine at 1, 500 RPM for 10 min
- NOx sensors at operating temperature, idle engine at 700 RPM until Exhaust Gas Temperature Sensor 1 is colder than 150°C (302°F).
- Verify NOx sensor 2 NOx Concentration is less than 50 ppm greater than NOx sensor 1 NOx Concentration.
- If NOx sensor 2 NOx Concentration is 50 ppm or more greater than NOx sensor 1 NOx Concentration
Replace the B195B Nitrogen Oxides Sensor 2
- Go to next step: If NOx sensor 2 NOx Concentration is less than 50 ppm greater than NOx sensor 1 NOx Concentration
- If NOx sensor 2 NOx Concentration is 50 ppm or more greater than NOx sensor 1 NOx Concentration
- Connect the Q61 Reductant Injector electrical connector.
- Verify none of the conditions listed below exist:
- Exhaust system leaks. Refer to Symptoms - Engine Exhaust
- Leaking fuel injectors. Refer to Cylinder Power Balance Test .
- 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 .
- Charge air cooler leaks. Refer to Full System Air Test Component/System Leak Test
- If a condition exists
Repair as necessary
- Go to next step: If no condition exists
- Replace the component: Nitrogen Oxides Catalytic Converter