Circuit/System Verification

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

Ignition On.
Verify a communication ('U' prefix) DTC is not set.
- If a DTC is set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
- If no DTC is set
Verify the following conditions do not exist:
- Induction system leaks - Refer to Induction System Smoke Test in Charge Air Cooler Diagnosis (Induction System Air Leak Test) , Charge Air Cooler Diagnosis (Induction System Smoke Test) and Charge Air Cooler Diagnosis .
- Exhaust system leaks - Refer to Exhaust Leakage .
- A loose or disconnected charge air cooler hose or pipe.
- Physical damage.
- Soot plugged B195 NOx Sensor.
- Loose or missing hardware.
- Loose B195 NOx sensors or B131 Exhaust Gas Temperature Sensors.
- If a condition is found
  Repair the intake or exhaust system.
- If no condition is found
Engine running.
Verify NOx Sensor 1 NOx Concentration and NOx Sensor 2 NOx Concentration are greater than 1 ppm for 60 s.
Accelerate vehicle to 80 km/h (50 mph) then decelerate with no accelerator pedal input to 72 km/h (45 mph), then continue deceleration with no accelerator pedal input for an additional 2 s.
WARNING: Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.
Perform a hard acceleration to 97 km/h (60 mph.) Continue acceleration and deceleration procedure until the DTC passes or fails on this key cycle.
- If the DTC does not pass
  Replace the B195 NOx sensor - position 2.
- If the DTC does pass
All OK.