RAM 1500 Van V6-3.9L VIN X (1997)
Powertrain Control Module: Customer Interest
PCM - Cold Engine Idle Fluctuation
NO: 18-13-97 Rev.A
GROUP: Vehicle Performance
DATE: Jun. 13, 1997
SUBJECT:
Cold Engine Idle Fluctuation
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-13-97 DATED MAR. 14, 1997 WHICH SHOULD BE REMOVED FROM
YOUR FILES. ALL CHANGES ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDES PART NUMBER AND MODEL ADDITIONS.
MODELS:
**1997
(AB)
Ram Van/Wagon **
1997
(AN)
Dakota
**1997
(BR)
Ram Truck**
NOTE:
THIS BULLETIN APPLIES TO 1997 VEHICLES WITH A 3.9L ENGINE BUILT PRIOR TO THE FOLLOWING DATES: (AB) JUN. 2, 1997
(MDH 0602XX), (AN) FEB. 19, 1997 (MDH 0219XX) (BR) JUN. 2, 1997 (MDH 0602XX).
SYMPTOM/CONDITION:
The vehicle may exhibit an idle fluctuation following a cold engine start. This condition is most noticeable while the transmission selector is in either the
park or neutral position. The incidence for idle fluctuation increases with lower engine start temperatures and is less likely to occur in a warm engine.
DIAGNOSIS:
Verify that the vehicle engine and powertrain control module are close to ambient temperature. Set the vehicle parking brake, place the transmission
selector in Park or Neutral, and start the engine. Without giving the engine any throttle assist, allow time for the fuel system to enter "closed loop" fuel
control and warm to normal operating temperatures. The engine idle speed should gradually decrease as the engine warms. If the engine exhibits idle
fluctuation during engine warm-up, perform the Repair Procedure.
PARTS REQUIRED:
REPAIR PROCEDURE:
This bulletin involves replacing the Powertrain Control Module (PCM) with revised parts.
1.
Following service manual procedures, replace the PCM.
NOTE:
THE FOLLOWING STEPS ARE REQUIRED BY LAW.
