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TSB 18-13-97 Rev. A

Cold Engine Idle Fluctuation

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Date: Jun. 13,1997

THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-13-97 DATED MAR. 14,1997 WHICH SHOULD BE REMOVED FROM YOUR FILES.

Models: 1997    (BR) Ram Truck

1997    (AS) Ram VanMagon
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).

Symptoms:

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:

1   56040377AF    Module, Engine Control (3.9L AN M/T) 

1   56040378AF    Module, Engine Control (3.9L AN AIT)

1   56040370AE    Module, Engine Control (3.9L AB AIT)
1   56040385AE    Module, Engine Control (3.9L BR AIT)
1   56040395AE    Module, Engine Control (3.9L BR M/T FED)
1   56040384AE    Module, Engine Control (3.9L BR MIT CAL)
1   1 04275086      Label - Authorized Modification

Repair:

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

2.    Type or print the following information on the Authorized Modification Label and attach the label near the VECI label (Fig 2). {Note: there is no fig 1}

 

notes:

POLICY: Reimbursable within the provisions of the warranty.

TIME ALLOWANCE:
Labor Operation No: 08-19-03-92 ................. 0.7 Hrs.

FAILURE CODE: P8 - New Part


Thanks to Bob Bergevin and Barry Drodge for supplying this TSB information

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This page was edited on: May 3, 2004