PCM - Sag or Hesitation on Cold Start Up
NO: 18-22-95GROUP: Vehicle Performance
EFFECTIVE DATE: Jul. 14, 1995
SUBJECT:
Sag or Hesitation on
Cold Start Up Below 20
Degrees Fahrenheit
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-23-94 DATED DEC. 2, 1994 WHICH SHOULD BE REMOVED FROM YOUR FILES OR NOTED IN THE 1994 TECHNICAL SERVICE BULLETIN MANUAL (PUBLICATION NO: 81-699-95054). THE SYMPTOM/CONDITION HAS BEEN REVISED. ALL REVISIONS ARE MARKED WITH **ASTERISKS**.
MODELS:
1993 (AC) Dynasty/New Yorker/New Yorker Salon
1993 - 1995 (AS) Caravan/Voyager/Town & Country
1993 (AY) Imperial/New Yorker Fifth Avenue
1994 - 1995 (ES) Chrysler Voyager
NOTE:
THIS BULLETIN APPLIES TO VEHICLES BUILT PRIOR TO NOV. 1, 1994 (MDH 11-01-XX) AND EQUIPPED WITH THE 3.3L OR THE 3.8L ENGINE.
SYMPTOM/CONDITION:
Sag or hesitation during operation in ambient temperatures below **20** degrees fahrenheit, 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 Procedure 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. **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 (GP1B)
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 16 OR HIGHER AND TIL CD RELEASE 1085 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 20 degrees fahrenheit.**
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.
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.
TIME ALLOWANCE:
Labor Operation No: 08-19-42-95 Powertrain Control Module Update 0.5 Hrs.
FAILURE CODE: FM - Flash Module