Engine Controls - Rough Engine Idle on Cold Start-Up: Overview

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NUMBER: 18-042-03

GROUP: Vehicle Performance

DATE: November 28, 2003

SUBJECT:
Flash - Rough Idle

THIS BULLETIN IS BEING PROVIDED IN ADVANCE. THE SOFTWARE WILL BE AVAILABLE ON TechCONNECT ON OR AFTER DECEMBER 15, 2003.

OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software.

NOTE:
For some 2002 LH vehicles it may be necessary to replace the PCM, refer to the part table below.

MODELS:

2002 - 2004 (LH) 300M/Concorde/Intrepid/LHS (U.S. Market)

NOTE:
This bulletin applies to 2002 - 2004 LH vehicles equipped with a 3.5L engine.

NOTE:
This bulletin is complex, the entire bulletin must be read and understood before performing the flash/repair process.

SYMPTOM/CONDITION:

Vehicle will exhibit rough idle quality after a cold start in ambient temperatures range of between 4.4° C (40° F) and 29.4° C (85° F). The engine will exhibit rough idle condition through several minutes during the engine warm up cycle. The engine will not exhibit rough idle quality when fully warm.

DIAGNOSIS:

Using a Scan Tool (DRBIII(R)) with the appropriate Diagnostic Procedures Manual, verify all other engine systems are functioning as designed. If DTCs are present record them on the repair order and repair as necessary before proceeding further with this bulletin.

If the vehicle operator describes or the technician experiences the Symptom/Condition, perform the Repair Procedure.





PARTS REQUIRED:





For 2002 model year LH vehicles equipped with the original PCM (as determined by the table) the PCM must be replaced with a generic PCM, part number 05127196AA.

If Service Bulletin 18-017-03 has been performed on a 2002 LH, the vehicle is a 2003 or 2004 model year, a new PCM WILL NOT be needed, only perform the flash update.





SPECIAL TOOLS/EQUIPMENT REQUIRED:

NOTE:
An updated J1962 cable has been released. This cable has a red colored connector at the DRBIII(R) connection. Use this cable whenever a flash is being performed.

POLICY:
Reimbursable within the provisions of the warranty.





TIME ALLOWANCE:





FAILURE CODE:

Disclaimer
This bulletin is supplied as technical information only and is not an authorization for repair.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.