SUBJECT: Improved Idle Quality on Cold Start Up
NO: 18­25­94
GROUP: Veh. Performance
DATE: Dec. 2, 1994
MODELS: 1995 (PL) Neon
NOTE: THIS BULLETIN APPLIES TO VEHICLES BUILT PRIOR TO OCT. 10, 1994 (MDH 10­10­XX).
SYMPTOM/CONDITION:
Cold start up steering column shake at idle. Condition most noticeable around ambient temperatures of 40 degrees Fahrenheit or below.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS) or the Scan Tool (DRB III) with the appropriate Diagnostic Procedure Manual, verify that all engine systems are functioning as designed. If Diagnostic Trouble Codes (DTC s) are present, record them on the repair order for future reference and repair as necessary. If no codes are present and all systems are functioning correctly, proceed with the following repair.
PARTS REQUIRED:
1 CH6000 Scan Tool (DRB III )
1 CH7035 General Purpose Interface Bus Cable (GPIB)
1 CH7000 J1962 Cable
1 5293386 PCM­Fed. Low Alt. (ATX)
1 5293387 PCM­Calif.(Prior to 8­5­94)(MDH 08­05­XX)& Fed. High Alt.(ATX)
1 5293388 PCM­Calif. After Aug. 5, 1994 (MDH 08­05­XX) (ATX)
1 5293384 PCM­Ccmpetitive Package (SALES CODE ACR) (MTX)
1 5293381 PCM­Fed. Low Alt. (MTX)
1 5293382 PCM­Fed. High Alt. & Calif (MTX)
1 4669020 Label ­ Authorized Software Update
1 4275086 Label ­ Authorized Modification
REPAIR PROCEDURE:
NOTE: THIS BULLETIN INVOLVES REPROGR!MNING PCM S ON VEHICLES BUILT ON OR AFTER AUGUST 6, 1994, OR REPLACING PCM's ON VEHICLES BUILT PRIOR TO AUGUST 5, 1994.

VEHICLES BUILT PRIOR TO AUGUST 5, 1994:

This repair involves replacing the Powertrain Control Module with a new one that incorporates revised software.

NOTE: VEHICLES BUILT PRIOR TO APRIL 6, 1994 MAY NOT BE EQUIPPED A STEEPING COLUMN DAMPER. TECHNICAL SERVICE BULLETIN 18­07­94 REV. A, DATED JUL. 22, 1994, PROVIDED THE PROCEDURE TO INSTALL A DAMPER WEIGHT, COOLING MODULE BUSHINGS, AND A SOFTWARE CHANGE TO THE PCM TO INPROVE IDLE ROUGHNESS ON THOSE VEHICLES BUILT PRIOR TO APRIL 6, 1994 (MDH 04­06­XX) F VERIFY THAT TSB 18­07­94 REV. A WAS APPLIED PRIOR TO PROCEEDING WITH THE REPAIR LISTED IN THIS SERVICE BULLETIN.

1. Remove the PCM as outlined on Page 8D ­ 1 in the 1995 Neon Service Manual Supplement (Publication No. 81­270­5025A), and replace it with the appropriate unit called out in "PARTS REQUIRED".

NOTE: THE FOLLOWING STEP IS REQUIRED BY LAW.

2. Type the required information on the Authorized Modification Label (as illustrated), and attach near the VECI Label.

VEHICLES BUILT AFTER AUGUST 6, 1994:

NOTE: THE MOPAR DIAGNOSTIC SYSTEM IS REQUIRED TO PERFORM THE FOLLWOING REPAIR. THE SYSTEM MUST BE OPERATIN WITH RELEASE 15 OR HIGHER INSTALLED

REPAIR:
This repair involves selectively erasing and reprogramming the Powertrain Control Module with new software (calibration change).

1. Connect the MDS (Mopar Diagnostic System) and DRBIII (Scan Tool) to the vehicle and power them up.
2. Use the arrow keys and select #2 MDS DIAGNOSTICS on the DRBIII MAIN MENU Screen.
3. Use the arrow keys and select DIAGNOSTIC MENU on the MDS, then press NEXT MENU.
4. Use the arrow keys and select CONTROLLER PROGRAMMING on the MDS, then press NEXT MENU.
5. Use the arrow keys and select PROGRAM CONTROLLER PART on the MDS, then press NEXT MENU.
6. Follow the steps presented on the MDS and DRBIII which will allow the DRBIII to obtain the current part number of the controller.
7. The MDS will display the part number of the controller on the vehicle and the appropriate replacement part number, then press NEXT MENU to begin programming.
If the controller on the vehicle has already been updated or programmed, a NO UPDATES AVAILABLE message will be displayed. Check the part number of the controller on the vehicle and compare it to the part number displayed. If the controller has already been updated, proceed to step 9.
8. The MDS and DRBIII will prompt for any operator action needed during the remainder of the programming process.

NOTE: THE STEPS ARE ARE BY LAW.
9. Type the necessary information on the "Authorized Software Update Label" and attach it to the PCM and cover the label with a clear plastic sticker.
10. Type the necessary information on the Authorized Modification Label and attach the label near the VECI Label.
POLICY: Reimbursable within the provisions of the warranty.