3500 4x2 Pickup L6-359 5.9L DSL Turbo (1994)
Control Module: Customer Interest
PCM, A/T - Vibration or Perceived Engine Miss
NO: 21-04-95
GROUP: Transmission
DATE: Apr. 14, 1995
SUBJECT:
Vibration or Perceived Engine Miss
MODELS:
1994 - 1995 (BR) Ram Truck
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH THE CUMMINS DIESEL ENGINE AND AUTOMATIC TRANSMISSION.
SYMPTOM/CONDITION:
A vibration or perceived engine miss at approximately 1100 RPM as the torque convertor clutch engages. This condition occurs in 4th gear at speeds
between 42 to 48 MPH.
DIAGNOSIS:
After duplicating the above condition, verity the part number on the Powertrain Control Module (PCM). For proper repair procedure, refer to the
guidelines given below.
1.
If the vehicle is a 1994 MY equipped with PCM P/N 56027303 or 56027304, replace the PCM with P/N 4798745. Proceed to the PCM
replacement section of this TSB.
2.
If the vehicle is a 1995 MY, verify that it is equipped with PCM P/N 56028335 or 56028336, and proceed to the PCM reprogramming section of
this TSB.
If the vehicle is equipped with a PCM other than 56028335, 56028336, 04798745, or 04856080, replace the PCM with P/N 4798745 and proceed
to the PCM replacement section of this TSB.
NOTE:
IF THE VEHICLE IS EQUIPPED WITH PCM P/N 4798745 OR 4856080, THE SOFTWARE UPDATE NEEDED TO ADDRESS THIS TSB
ISSUE HAS ALREADY BEEN COMPLETED AND NO FURTHER ACTION IS REQUIRED.
PARTS REQUIRED:
1
04798745
Module, Powertrain Control (1994 Only)
1
4669020
Label - Authorized Software Update
1
4275086
Label - Authorized Modification
EQUIPMENT REQUIRED:
1
CH6000
Scan Tool (DRB III)
1
CH7000
General Purpose Interface Bus Cable (GPIB)
1
CH7015
Cable
REPAIR PROCEDURE/MODULE REPLACEMENT:
This section of the bulletin involves the replacement of the Powertrain Control Module (PCM) with P/N 4798745.
1.
Record all radio station presets.
2.
Disconnect negative battery cable at battery.
3.
Remove 60 way electrical connector from PCM (one bolt). PCM is located in the right rear side of the engine compartment.
4.
Remove the three PCM mounting bolts and remove.
