Engine Controls - Torque Converter Shudder/AC Blows Warm
NUMBER: 18-027-08 REV. AGROUP: Vehicle Performance
DATE: August 28, 2009
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-027-08, DATED JUNE 24, 2008, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE AN ADDITIONAL MODEL YEAR ALONG WITH AN UPDATED SYMPTOM/CONDITION.
THE StarSCAN(R) FLASH FILES FOR THIS BULLETIN MUST BE RETRIEVED FROM THE INTERNET.
StarSCAN(R) SOFTWARE LEVEL MUST BE AT RELEASE 9.01 OR HIGHER FOR THIS BULLETIN.
StarMOBILE STANDALONE MODE OR StarMOBILE DESKTOP CLIENT MAY ALSO BE USED TO PERFORM THIS PROCEDURE.
SUBJECT:
Flash: Torque Converter Shudder Or Erratic AC Performance Or AC Intermittently Blows Warm Air During Drive Cycle
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software.
MODELS:
**2007** - 2008 (KA) Nitro
2008 (KK) Liberty
NOTE:
This bulletin applies to the above listed vehicles equipped with a 3.7L engine (sales code EKG) built before June 17, 2008 (MDH 0617XX).
SYMPTOM/CONDITION:
Some customers may experience one or more of the following:
A. Torque converter shudder on A/C engagement and disengagement or torque converter shudder on torque converter pull-ins or during a partial lock operation. Pull-ins are when the torque converter goes from unlock to a partial lock or a full lock condition. This condition affects vehicles equipped with automatic transmissions only.
B. **Erratic AC performance or AC intermittently blows warm air during drive cycle. This is caused by delayed compressor engagements while the OBDII ERG monitor is running. This condition will only affect vehicles equipped with automatic transmissions. **
DIAGNOSIS:
Using a Scan Tool (StarSCAN(R)) with the appropriate Diagnostic Procedures available in TechCONNECT, verify all engine systems are functioning as designed. If DIG's are present record them on the repair order and repair as necessary before proceeding further with this bulletin.
If the vehicle operator describes or experiences the Symptom/Condition, perform the Repair Procedure.
PARTS REQUIRED:
SPECIAL TOOLS / EQUIPMENT REQUIRED:
REPAIR PROCEDURE - USING THE INTERNET TO RETRIEVE THE FLASH FILE:
NOTE:
Before performing this Repair Procedure, the operating software in the StarSCAN� must be programmed with software release level 9.01 or higher. The software release level is visible in the blue header at the top of the StarSCAN(R) screen.
NOTE:
The StarSCAN(R) diagnostic scan tool fully supports Internet connectivity. However, to take advantage of this feature you must first configure the StarSCAN(R) for your dealership's network. Make sure the StarSCAN(R) is configured to the dealership's network before proceeding. For instruction on setting up your StarSCAN� for the dealer's network refer to either:
"DealerCONNECT > Service > StarSCAN and StarMOBILE tools > Online Documentation", or refer to the StarSCAN(R) Quick Start Networking Guide. The StarSCAN(R) Quick Start Networking Guide is also available on the website under the "Download Center".
NOTE:
If this flash process is interrupted/aborted, the flash should be restarted.
1. Reprogram the PCM with the latest software. Follow the detailed service procedures available in DealerCONNECT/TechCONNECT, Refer To Group 8 - Electrical > Electronic Control Modules - Service Information > Module - Powertrain Control > Standard Procedures > PCM/ECM Programming - Gas.
2. Type the necessary information on the "Authorized Modification Label and attach it near the VECI label.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
FAILURE CODE:
Disclaimer:
This bulletin is supplied as technical information only and is not an authorization for repair.