Grand Voyager V6-3.0L VIN 3 (1998)
PROM - Programmable Read Only Memory: Customer Interest
PCM - Improper Cooling Fan Relay Actuation
NO: 18-33-97
GROUP: Vehicle Performance
DATE: Dec. 31, 1997
SUBJECT:
Improper Cooling Fan Relay Actuation
MODELS:
1998 (NS) Town & Country/Caravan/Voyager
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 2.4L, 3.3L OR 3.8L ENGINE BUILT PRIOR TO DEC. 1, 1997 (MDH 1201
XX).
DISCUSSION:
The software within the powertrain control module (PCM) may not operate or drive the solid state relay for the radiator fan correctly. The vehicle could
eventually exhibit an overheat condition due to cooling fan relay failure.
NOTE:
ALL IN STOCK OR IN TRANSIT VEHICLES BUILT PRIOR TO THE ABOVE CLEAN POINT SHOULD BE FLASH UPDATED PRIOR TO
CUSTOMER DELIVERY.
EQUIPMENT/PARTS REQUIRED:
1
CH6000
Scan Tool (DRB III)
1
CH7035
General Purpose Interface Bus Cable (GPIB)
1
CH7000/7001
J1962 Cable
1
04669020
Label - Authorized Software Update
1
04275086
Label - Authorized Modification
NOTE:
THE MDS AND DRB III ARE REQUIRED TO PERFORM THIS REPAIR AND THE SYSTEM MUST BE OPERATING WITH RELEASE 21
OR HIGHER AND TIL CD RELEASE 1146 OR HIGHER MUST BE INSTALLED.
REPAIR PROCEDURE:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (calibration changes).
1.
Connect the MDS (Mopar Diagnostic System) and DRB III (Scan Tool) to the vehicle and power them up.
2.
Use the arrow keys and select # 2 MDS DIAGNOSTICS on the DRB III MAIN MENU Screen.
3.
Use the arrow keys and select DIAGNOSTIC MENU on the MDS, then press NEXT MENU.
4.
Use the arrow keys and select VEHICLE CONTROLLER PROGRAMMING on the MDS, then press NEXT MENU.
5.
Use the arrow keys and select PROGRAMMING OF ALL OTHER CONTROLLERS USING MDS & DRB III on the MDS, then press NEXT
MENU.
6.
Follow the steps presented on the MDS and DRB III which will allow the DRB III to obtain the current part number of the PCM.
7.
The MDS will display the part number of the PCM on the vehicle and the appropriate replacement part number, then press NEXT MENU to begin
programming.
If the PCM on the vehicle has already been updated or programmed, a NO UPDATES AVAILABLE message will be displayed. Check the part
number of the PCM on the vehicle and compare it to the part number displayed. If the PCM has already been updated, then another condition
exists that will require further diagnosis and repair.
8.
The MDS and DRB III will prompt for any operator action needed during the remainder of the programming process.
NOTE:
THE FOLLOWING STEPS ARE REQUIRED BY LAW.