Diesel Exhaust Fluid (DEF) Warning Strategy (Anti-Tampering)
Diesel Exhaust Fluid (DEF) Warning Strategy (Anti-Tampering)
The reductant system supplies the Selective Catalyst Reduction (SCR) stage of the vehicle's exhaust after treatment system with the Diesel Exhaust Fluid (DEF) required to reduce exhaust Oxides of Nitrogen (NOx) levels. The Engine Control Module (ECM) continuously monitors the performance of the reductant system during operation.
When the conditions associated with an attempt to disable reductant system operation are detected, the ECM activates the anti-tampering feature and presents the driver with a series of prompts and warnings.
Once initiated, anti-tampering warnings grow increasingly more serious as the vehicle continues to be driven. The vehicle's current warning status is displayed on the scan tool. When tampering is suspected, the normally OFF Reductant System Malfunction Warning Indicator Command will display Warning Level 1 through Warning Level 11 depending on the number of miles driven. The series anti-tampering warnings alert the driver that reductant system service is urgently needed.
Warning Level 1
Warning Level 1 is triggered when the ECM first detects an abnormal value on a reductant system circuit. The Driver Information Center (DIC) displays the following messages:
* Service Exhaust Fluid System
* See Owner's Manual Now
* 160 km (99 miles) until 105 km/h (65 mph) Max Speed
The messages alternate every 5 seconds in the DIC until acknowledged by the driver; however, the mileage countdown message remains in the DIC. The DEF Indicator in the instrument panel is illuminated.
Warning Level 2
Warning Level 2 is triggered after the first mileage counter expires. The driver will hear 4 chimes on entering Warning Level 2. The DIC displays the following messages:
* Service Exhaust Fluid System
* See Owner's Manual Now
* Transitioning to 105 km/h (65 mph) Max Speed
The messages alternate every 5 seconds in the DIC until acknowledged by the driver; however, the Transitioning to 105 km/h (65 mph) Max Speed remains in the DIC. The DEF Indicator in the instrument panel is illuminated. Vehicle speed limit is ramping down from max speed limit to the limit of 105 km/h (65 mph).
Warning Level 3
Warning Level 2 automatically advances to Warning Level 3 after the speed limit ramp down is complete or a key cycle. The driver will hear 4 chimes on entering Warning Level 3. The DIC displays the following messages:
* Service Exhaust Fluid System
* See Owner's Manual Now
* Speed Limited to 105 km/h (65 mph)
* 120 km (75 miles) Until 89 km/h (55 mph) Max Speed
The messages alternate every 5 seconds in the DIC until acknowledged by the driver; however, the Speed Limited to 105 km/h (65 mph) remains in the DIC. The DEF Indicator in the instrument panel is illuminated.
Vehicle speed is limited to 105 km/h (65 mph).
Warning Level 4
Warning Level 4 is triggered after the second mileage counter expires. The driver will hear 4 chimes on entering Warning Level 4. The DIC displays the following messages:
* Service Exhaust Fluid System
* See Owner's Manual Now
* Transitioning to 89 km/h (55 mph) Max Speed
The messages alternate every 5 seconds until acknowledged by the driver; however, the Transitioning to 89 km/h (55 mph) Max Speed remain displayed in the DIC. The DEF Indicator in the instrument panel flashes continuously. Vehicle speed limit is ramping down from 105 km/h (65 mph) max speed limit to 89 km/h (55 mph).
Warning Level 5
Warning Level 4 automatically advances to Warning Level 5 after speed limit ramp down is complete or a key cycle. The driver will hear 4 chimes on entering Warning Level 5. The series of 4 chimes will repeat 3 times every 3 minutes during each ignition cycle until the vehicle is serviced. The DIC displays the following messages:
* Service Exhaust Fluid System
* See Owner's Manual Now
* Speed Limited to 89 km/h (55 mph)
* 120 km (75 miles) Until 7 km/h (4 mph) Max Speed
The messages alternate every 5 seconds until acknowledged by the driver; however, the speed limitation and mileage countdown remains displayed in the DIC. The DEF Indicator in the instrument panel flashes continuously.
Vehicle speed is limited to 89 km/h (55 mph)
Warning Level 6
Warning Level 6 is not used
Warning Level 7
Warning Level 7 is not used
Warning Level 8
Warning Level 8 is not used
Warning Level 9
Warning Level 9 is not used
Warning Level 10
Warning Level 5 automatically advances to Warning Level 10 after third mileage counter expires or a key cycle. The driver will hear 4 chimes on entering Warning Level 10. The DIC displays the following messages:
* Service Exhaust Fluid System
* See Owner's Manual Now
* Transitioning to 7 km/h (4 mph)
The messages alternate every 5 seconds until acknowledged by the driver; however, the Transitioning to 7 km/h (4 mph) remains displayed in the DIC. The DEF Indicator in the instrument panel flashes continuously. Vehicle speed limit is ramping down from 89 km/h (55 mph) max speed limit to 7 km/h (4 mph).
Warning Level 11
Warning Level 10 automatically advances to Warning Level 11 after speed limit ramp down is complete or a key cycle. The driver will hear 4 chimes on entering Warning Level 11. The series of 4 chimes will repeat every 3 minutes until the vehicle is serviced. The DIC displays the following messages:
* Service Exhaust Fluid System
* See Owner's Manual Now
* Speed Limited to 7 km/h (4 mph)
The messages alternate every 5 seconds until acknowledged by the driver; however, the Speed Limited to 7 km/h (4 mph) remains displayed in the DIC. The DEF Indicator in the instrument panel flashes continuously.
Vehicle speed is limited to 7 km/h (4 mph).