Neon L4-2.0L DOHC (1996)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
PCM - Cold Start Hesitation/Sag/Stumble,Idle Variation
NO: 18-08-96
GROUP: Vehicle Performance
DATE: Mar. 8, 1996
SUBJECT:
Cold Start Hesitation/Sag/Stumble, A/C Idle Speed Variation and Highway Cycling Effects
MODELS:
1996 (PL) Neon
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH THE 2.0L SOHC AND DOHC ENGINES (AUTOMATIC AND MANUAL
TRANSAXLE) BUILT PRIOR TO FEBRUARY 19, 1996 (MDH 02-19-XX) IN THE BELVEDERE ASSEMBLY PLANT (D IN THE 11TH
POSITION OF THE VIN) AND ALL TOLUCA BUILT VEHICLES.
SYMPTOM/CONDITION:
The following vehicle performance symptoms are substantially improved by the revised software in this bulletin.
^
The engine hesitates on the first few throttle openings following a cold or partial cool down start (more pronounced after overnight soak).
^
Engine RPM surges or dips at idle when A/C cycles.
^
A slight bump, which can be described as a hesitation, is felt at highway speeds when the A/C cycles on or off.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS) or the Scan Tool (DRB III) and appropriate Diagnostic Procedure Manual, verify that all engine systems are
functioning correctly. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order for future reference and repair as necessary.
EQUIPMENT/PARTS REQUIRED:
1
CH6000
Scan Tool (DRB III)
1
CH7035
General Purpose Interface Bus Cable (GPIB)
1
CH7000
J1962 Cable
1
4669020
Label - Authorized Software Update
1
4275086
Label - Authorized Modification
NOTE:
THE MOPAR DIAGNOSTIC SYSTEM IS REQUIRED TO PERFORM THE FOLLOWING REPAIR AND THE SYSTEM MUST BE
OPERATING WITH RELEASE 19 OR HIGHER AND TIL CD RELEASE 1099 OR HIGHER MUST BE INSTALLED.
REPAIR PROCEDURE:
This bulletin involves reprogramming (flashing) the PCM with new software (calibrations).
1.
Connect the MDS (Mopar Diagnostic System) and DRB III (Scan Tool) to the vehicle and power them up.
2.
Use the arrow keys and select # 2 MDS DIAGNOSTICS on the DRB III 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 VEHICLE CONTROLLER on the MDS, then press NEXT MENU.
6.
Follow the steps presented on the MDS and DRB III which will allow the DRB III to obtain the current part number of the PCM.
7.
The MDS will display the part number of the PCM on the vehicle and the appropriate replacement part number, then press NEXT MENU to begin
programming.