Engine Controls - Rough Idle On Cold Start Up
NUMBER: 18=023=10GROUP: Vehicle Performance
DATE: July 8, 2010
THE WiTECH DIAGNOSTIC APPLICATION IS THE PREFERRED METHOD FOR FLASHING ECUs.
HELP USING THE WiTECH DIAGNOSTIC APPLICATION FOR FLASHING AN ECU IS AVAILABLE BY SELECTING "HELP" THEN "HELP CONTENTS" AT THE TOP OF THE WiTECH DIAGNOSTIC APPLICATION WINDOW.
THE WiTECH SOFTWARE LEVEL MUST BE AT RELEASE 10.04 OR HIGHER TO PERFORM THIS PROCEDURE.
StarMOBILE DESKTOP CLIENT MAY ALSO BE USED TO PERFORM THIS PROCEDURE.
SUBJECT:
Flash: Rough Idle On Start Up With Ambient Temperatures Below 50° (10°C)
OVERVIEW:
This bulletin involves flash reprogramming the Powertrain Control Module (PCM) with new software.
MODELS:
2008 - 2009 (LE) 300C/300C Touring (International Markets)
2008 - 2010 (LX) 300/300 C/Charger/Magnum
2008 - 2009 (L2) 300 (China)
NOTE:
This bulletin applies to LE/L2 vehicles equipped with a 2.7L engine (Sales code EER) and a 4-speed automatic transmission (sales code DGV).
NOTE:
This bulletin applies to LX vehicles equipped with a 2.7L engine (Sales code EER) and a 4-speed automatic transmission (sales code DGV) built before May 11, 2010 (MDH 0511XX).
SYMPTOM/CONDITION:
Some customers may notice that they have a rough idle upon start up when temperatures are below 50° (10° C) This condition most likely happens during the summer and fall seasons while summer blend fuels are in use The condition is not noticeable after the engine warms to operating temperature.
To correct this condition the PCM software was changed to add additional fuel and increase spark advance during the warm up cycle.
DIAGNOSIS:
Using a Scan Tool (wiTECH) with the appropriate Diagnostic Procedures available in TechCONNECT verify all engine systems are functioning as designed If DTCs 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:
REPAIR PROCEDURE:
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 After PCM reprogramming the following must be performed:
a. Clear any DTCs that may have been set in other modules due to reprogramming The WiTECH application will automatically present all DTCs after the flash and allow the tech to clear them.
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.