Engine - Roughness With A/C ON, Below Normal Idle Speed

NUMBER: 18-017-01 REV A

GROUP: Vehicle Performance

DATE: Dec. 7, 2001

THIS BULLETIN IS BEING PROVIDED IN ADVANCE. DO NOT PERFORM ANY ACTIONS RELATED TO THIS BULLETIN UNTIL DECEMBER 24, 2001. THE MDS2 MUST BE OPERATING WITH CIS CD2098 OR HIGHER.

THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-017-01, DATED JULY 20, 2001, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** WHICH INCLUDE CHANGES TO THE SYMPTOMS AND REVISED SOFTWARE.

SUBJECT:
Engine Idle Undershoot/Performance

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

MODELS:

2000 - 2001 (PL) Neon

SYMPTOM/CONDITION:

Some vehicles may exhibit one or more of the following symptoms:

In ambient conditions typically below 16° C. (60° F) the engine may undershoot the normal idle speed when braking the vehicle to a stop (clutch depressed on manual transmission equipped vehicles).**

^ Engine roughness immediately after manually switching the A/C system "Off". Normal operation returns after a wide open throttle (WOT) occurrence or after engine restart.

^ **In ambient conditions between 10° and 20° C. (50° and 70° F) the engine may undershoot the normal idle speed at cold start gear engagement (2000 M.Y. with automatic transmission).**

NOTE:
**THE SOFTWARE PROVIDED WITH THIS BULLETIN ALSO INCLUDES THE SOFTWARE PROVIDED WITH TECHNICAL SERVICE BULLETIN 18-019-00 DATED OCTOBER 6, 2000.**

DIAGNOSIS PROCEDURES:

If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order and repair as necessary before proceeding further with this bulletin. If the condition(s) can be duplicated or are described by the customer, perform the Repair Procedure.





PARTS REQUIRED:





EQUIPMENT REQUIRED:

REPAIR PROCEDURE:

Reprogram the PCM using the MDS2 (Mopar Diagnostic System) and DRBIII(R) (Scan Tool).

NOTE:
THE FOLLOWING STEPS ARE REQUIRED BY LAW.





1. Type the necessary information on the "Authorized Software Update Label" p/n 04669020 (Fig. 1). Attach the label to the PCM and cover the label with the clear plastic overlay.





2. Type the necessary information on the "Authorized Modification Label" p/n 04275086 and attach the label near the VECI label (Fig. 2).

POLICY:
Reimbursable within the provisions of the warranty.





TIME ALLOWANCE:





FAILURE CODE: