Mercedes Benz Truck R 320 BLUETEC Technical S-47_20-48B Date: 090204
Diesel Engine - MIL ON/Hard Start/Stall In Cold Temps.
Date: February 4, 2009
Order No.: S-B-47.20/48b
Supersedes: S-B-47.20/48a dated January 6, 2009
Group: 47
Revision History
Revision Date Purpose
b 2/4/09 Remedy Revised
a 1/6/09 Applicable Models and Report Information Updated
- 8/20/07 Initial issue
SUBJECT:
All Models Equipped with Diesel Engines
Check Engine Lamp Illuminated and Engine Will Not Start or Stalls After Starting at Low Ambient Temperatures (-15°C / 5°F)
If you receive customer reports in the above model diesel vehicles that the Check Engine Lamp is illuminated and the engine will not start or engine
stalls after starting at low ambient temperatures (-15°C / 5°F), this may be due to diesel fuel jelling.
Mercedes Benz Truck R 320 BLUETEC
Page 205
Note:
The Diagnostic Trouble Code "Rail Pressure too low" is stored in the engine control unit (refer below).
Diesel fuel jelling is a condition which occurs at low outside temperatures due to paraffin separation causing impaired diesel fuel flow. The diesel
fuel supply for the injection system may be impaired due to clogged fuel filters. An indication of this condition is that the vehicle will start when the
vehicle / fuel system has warmed up. There is no need to replace any fuel system or injection components.
To prevent this condition from occurring due to poor winter diesel fuel quality, it may be necessary to add a diesel fuel additive to the fuel. After
adding the fuel additive to the diesel fuel allow the vehicle to idle for a short time in order for the additive to mix thoroughly with the diesel fuel.
Note:
When adding the fuel additive to the diesel fuel follow the directions on the bottle for the correct dosage amount. If too much fuel additive is added,
the effect may be to increase paraffin separation when using winter diesel fuel.
Warning!
The use of gasoline to improve the resistance of diesel fuel jelling in the cold is NOT allowed. Check your vehicle manual for details.
To Remedy a vehicle with this issue:
1. Warm the vehicle / fuel system to a minimum temperature of 3°C / 38°F
2. Replace the fuel filter. Refer to EPCNet for applicable part number.
3. Add diesel fuel additive to the fuel ensuring both the additive and fuel is at a temperature of at least 3°C / 38°F (Follow recommended dosage on
the label)
4. Allow the vehicle to idle for a short time in order for the additive to mix thoroughly with the diesel fuel.
Note:
For more information regarding diesel fuel and additives check WIS Documents:
BB00.40-P-0137-00A - Winter operation with diesel fuels
BB00.40-P-0137-01A - Flow improvers for diesel fuels
Parts Information
Diesel Engine - MIL ON/Hard Start/Stall In Cold Temps.
Date: February 4, 2009
Order No.: S-B-47.20/48b
Supersedes: S-B-47.20/48a dated January 6, 2009
Group: 47
Revision History
Revision Date Purpose
b 2/4/09 Remedy Revised
a 1/6/09 Applicable Models and Report Information Updated
- 8/20/07 Initial issue
SUBJECT:
All Models Equipped with Diesel Engines
Check Engine Lamp Illuminated and Engine Will Not Start or Stalls After Starting at Low Ambient Temperatures (-15°C / 5°F)
If you receive customer reports in the above model diesel vehicles that the Check Engine Lamp is illuminated and the engine will not start or engine
stalls after starting at low ambient temperatures (-15°C / 5°F), this may be due to diesel fuel jelling.
Mercedes Benz Truck R 320 BLUETEC
Page 205
Note:
The Diagnostic Trouble Code "Rail Pressure too low" is stored in the engine control unit (refer below).
Diesel fuel jelling is a condition which occurs at low outside temperatures due to paraffin separation causing impaired diesel fuel flow. The diesel
fuel supply for the injection system may be impaired due to clogged fuel filters. An indication of this condition is that the vehicle will start when the
vehicle / fuel system has warmed up. There is no need to replace any fuel system or injection components.
To prevent this condition from occurring due to poor winter diesel fuel quality, it may be necessary to add a diesel fuel additive to the fuel. After
adding the fuel additive to the diesel fuel allow the vehicle to idle for a short time in order for the additive to mix thoroughly with the diesel fuel.
Note:
When adding the fuel additive to the diesel fuel follow the directions on the bottle for the correct dosage amount. If too much fuel additive is added,
the effect may be to increase paraffin separation when using winter diesel fuel.
Warning!
The use of gasoline to improve the resistance of diesel fuel jelling in the cold is NOT allowed. Check your vehicle manual for details.
To Remedy a vehicle with this issue:
1. Warm the vehicle / fuel system to a minimum temperature of 3°C / 38°F
2. Replace the fuel filter. Refer to EPCNet for applicable part number.
3. Add diesel fuel additive to the fuel ensuring both the additive and fuel is at a temperature of at least 3°C / 38°F (Follow recommended dosage on
the label)
4. Allow the vehicle to idle for a short time in order for the additive to mix thoroughly with the diesel fuel.
Note:
For more information regarding diesel fuel and additives check WIS Documents:
BB00.40-P-0137-00A - Winter operation with diesel fuels
BB00.40-P-0137-01A - Flow improvers for diesel fuels
Parts Information
