Neon L4-2.0L SOHC (1995)
PROM - Programmable Read Only Memory: Customer Interest
PCM - EGR Monitor Faults, Cold Sag or Hesitation
NO: 18-36-95
GROUP: Vehicle Performance
DATE: Dec. 8, 1995
SUBJECT:
EGR Monitor Faults and/or Sag or Hesitation on Cold Start Below 32 Degrees Fahrenheit.
MODELS: 1995 (PL) Neon
NOTE:
This bulletin does not apply to vehicles that have had the Powertrain Control Module reprogrammed on TSB 18-20-95 Rev. A, 18-38-95, or
18-39-95 dated December 08, 1995.
SYMPTOM/CONDITION:
Sag or hesitation during operation in ambient temperatures below 32° F., with high humidity, and usually after the vehicle has been sitting overnight. The
Check Engine Light may be illuminated and Diagnostic Trouble Code (DTC) "EGR SYSTEM FAILURE" may be present.
DIAGNOSIS:
Using the Mopar Diagnostic System (MDS) or the Scan Tool (DRB III) with the appropriate Diagnostic Procedures, 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. If no codes or only DTC "EGR SYSTEM FAILURE" is present and all systems are functioning correctly, proceed
with the following repair.
EQUIPMENT/PARTS REQUIRED:
1
CH6000
Scan Tool (DRB III)
1
CH7035
General Purpose Interface Bus Cable (GPIB)
1
CH7015
Engine 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 18 or higher and TIL CD
release 1095 or higher must be installed.
REPAIR PROCEDURE:
This repair involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software (calibrations) which disables EGR
diagnostics below 32° F.
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 CONTROLLER PART 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.
^
If the PCM on the vehicle has already been updated or programmed, a NO UPDATES AVAILABLE message will be displayed. Check the
part number of the PCM on the vehicle and compare it to the part number displayed. If the PCM has already been updated, then another
condition exists that will require further diagnosis and repair.
8.
The MDS and DRB III will prompt for any operator action needed during the remainder of the programming process.
NOTE:
The following steps are required by law.