Neon L4-2.0L VIN C (1997)
PROM - Programmable Read Only Memory: Customer Interest
PCM - Stumble/Rpm Flare/Low Performance With A/C ON
NO: 18-28-96
GROUP: Vehicle Performance
DATE: Oct. 4, 1996
SUBJECT:
Cold Start Stumble, RPM Flare (MTX), Performance With A/C On, Radiator Steams
MODELS:
1997 (PL) Neon
NOTE:
THIS BULLETIN APPLIES TO 1997 MODELS BUILT PRIOR TO SEPTEMBER 23, 1996 MDH (09-23-XX).
SYMPTOM/CONDITION:
1.
Engine stumble within 10 seconds of a cold start. If this condition persists after repair, it is recommended to change fuel brands.
2.
RPM flares slightly when A/C or power steering loads are released, MTX only.
3.
Vehicle lacks performance on low speed tip-in with A/C on, more noticeable on ATX vehicles. Does not improve vehicle launch performance.
4.
Radiator "steams" during warm-up.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS) or the Diagnostic Scan Tool (DRB III) with the appropriate Diagnostic Procedures Manual, verify all
engine/transmission systems are functioning as designed. If Diagnostic Trouble Codes (DTC's) are present, record them on the repair order and repair as
necessary before proceeding further with this bulletin.
Test the Idle Air Control (IAC) by performing the IAC wiggle test. Select Engine System Test IAC wiggle test, follow screen prompts. If the IAC wiggle
test fails, repair as necessary before proceeding. If the IAC wiggle test passes and no DTC's are present, perform the Repair Procedure.
EQUIPMENT REQUIRED:
All Symptoms (Flash Programming)
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 MDS AND DRB III ARE REQUIRED TO PERFORM THIS REPAIR AND THE SYSTEM MUST BE OPERATING WITH RELEASE 20
OR HIGHER AND TIL CD RELEASE 1117 OR HIGHER MUST BE INSTALLED.
REPAIR PROCEDURE:
This repair involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (calibration changes) for all
conditions listed.
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.
