RAM 3500 Chassis Cab Truck 2WD L6-6.7L DSL Turbo (2010)
Engine Control Module: Customer Interest
Engine Controls - ECM Update for Fan Clutch Operation
NUMBER: 07-003-10
GROUP: Cooling
DATE: September 09, 2010
SUBJECT:
High Coolant Temperatures On Vehicles Equipped With Snow Plows
OVERVIEW:
This bulletin provides information on how to program the Engine Control Module (ECM) to force the fan clutch to fully engage at all operating
conditions
MODELS:
2007 - 2010
DC/DM
Ram 3500/4500/5500 Cab Chassis Trucks
2011
DD/DP
Ram 3500/4500/5500 Cab Chassis Trucks
NOTE:
This bulletin applies to vehicles equipped with the 6.7L Cummins Diesel engine (Sales Code ETJ)
DISCUSSION:
Customers that operate their vehicle with a snowplow attached to the vehicle may cause the airflow passing through the radiator to be disrupted resulting
in higher than normal engine temperatures The 6~7L Cummins ECM is equipped with software that can fully engage the fan clutch to allow an increase
of airflow through the radiator Customers can initiate the fan clutch operation by performing the following button sequence
NOTE:
2007 early 2009 models were not originally equipped with the fan clutch software however, recently released software does include this enhancement
Ensure that the ECM software is at the latest level and if not, flash the ECM Refer to Service Bulletin 18-020-10 for additional information
1. Turn the ignition key to the run position or start the truck
2. Simultaneously press and release the Cruise Control "Cancel" button/lever and the "Exhaust Brake" button. Repeat this sequence four times within
five seconds. The chime will sound twice as an audible indicator that the function is engaged
3. To disable the function, repeat the same procedure The chime will sound four times as an audible indicator that the function is disengaged
NOTE:
Customer's should be made aware that an increase in fan noise and a decrease in fuel economy may result when using this feature.
POLICY:
Information Only
Disclaimer:
This bulletin is supplied as technical information only and is not an authorization for repair.
