Engine Controls - Poor A/C Performance
NUMBER: 24-004-05GROUP: Heating & Air Conditioning
DATE: February 11, 2004
THIS BULLETIN SUPERSEDES SERVICE BULLETIN 24-005-04, DATED OCTOBER 16, 2004, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE UPDATED SYMPTOMS/CONDITIONS AND BUILD DATES.
THE StarSCAN FLASH FILES FOR THIS BULLETIN ARE AVAILABLE VIA THE INTERNET.
THE StarSCAN SOFTWARE UPDATE CD CONTAINS ALL PREVIOUSLY RELEASED FLASH FILES PRIOR TO THE CD RELEASE DATE PRINTED ON THE CD LABEL.
FOR MARKETS OUTSIDE OF THE UNITED STATES AND CANADA, THE FLASH FILES AND REPROGRAMMING INSTRUCTIONS WILL BE AVAILABLE ON ITIL/ISIS DVD MARCH, 2005.
SUBJECT:
Flash: Poor Or Intermittent A/C Performance
OVERVIEW:
This bulletin involves verifying the proper A/C system charge and selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software.
MODELS:
2005 (LX) 300/Magnum
NOTE:
This bulletin should be performed on all subject vehicles that come into the dealerships.
NOTE:
**This bulletin applies to vehicles with a 2.7L or 3.5L engine (sales code EER or EGG) built on or before August 19, 2004 (MDH 0819XX)**.
NOTE:
**This bulletin applies to vehicles with a 5.7L engine (sales code EZB) built before January 31, 2005, 2005 (MDH 0131XX)**.
SYMPTOM/CONDITION:
The vehicle operator may experience on of the following:
^ A/C cut-out
^ A/C cut-out at low speeds
^ **A/C cut-out at highway speeds 5.7L engine**
^ Poor A/C performance
DIAGNOSIS:
Using a Scan Tool (StarSCAN) verify that the A/C system has no diagnostic trouble codes (DTC's). If DTCs are present record them on the repair order and repair as necessary before proceeding further with this bulletin.
Check the A/C pressure to ensure that it is at the proper level. Be sure the pressure is not under filled or over filled because this may also contribute to the poor A/C performance.
NOTE:
If the system is under charged or over charged it is still necessary to perform the flash procedure.
If the vehicle operator describes the Symptom/Condition perform the Repair Procedure.
NOTE:
There are two methods to download flash files to StarSCAN. The first method (NEW) is to download the flash files to the StarSCAN from the internet. The second method is to download the flash files from the StarSCAN Software Update CD.
PARTS REQUIRED:
NOTE:
The StarSCAN must be at version 4.07 or higher before the "Using The Internet To Retrieve The Flash File" repair procedure can be performed.
NOTE:
The StarSCAN diagnostic scan tool fully supports Internet connectivity. However, in order to take advantage of this feature you must first configure the StarSCAN for your dealership's network. For instruction on setting up your StarSCAN for the dealer's network; refer to the StarSCAN Quick Start Networking Guide available on the website under the "download center".
NOTE:
Make sure the StarSCAN is configured to the dealership's network before proceeding.
NOTE:
If this flash process is interrupted/aborted, the flash should be restarted.
1. Connect the CH9404 StarSCAN vehicle cable to the StarSCAN and the vehicle.
2. Connect the CH9410 StarSCAN ethernet cable to the StarSCAN and the dealer's network drop (optional).
3. Retrieve the old PCM part number. Using the StarSCAN at the "Home" screen:
a. Select "ECU View"
b. Touch the screen to highlight the PCM in the list of modules.
c. Select "More Options".
d. Select "ECU Flash"
e. Record the "Part Number", displayed on the "Flash PCM" screen, for later reference.
4. If the StarSCAN is connected to the dealer's network drop and the vehicle, proceed to Step # 5. If the StarSCAN is not connected to the dealer's network drop and the vehicle, proceed to Step # 10
5. Select "Browse for new file".
6. Select the appropriate calibration.
7. Select "Download to Scantool".
8. Select "Close" after the download is complete. Proceed to Step # 11.
9. Connect the CH9410 StarSCAN ethernet cable to the StarSCAN and the dealer's network drop (if not already connected).
10. Download the flash file from the Internet to the StarSCAN. Using the StarSCAN at the "Home" screen:
a. Select "Flash Download".
b. Select "Enter information manually". Press the "Next" button and follow the on screen instructions.
c. Select the appropriate calibration.
d. Select "Download to Scantool".
e. Select "Close" after the download is complete.
11. Connect the CH9404 StarSCAN vehicle cable to the StarSCAN and the vehicle (if not already connected).
12. Open the hood, install a battery charger and verify that the charging rate provides approximately 13.5 volts.
13. Download the file from StarSCAN to the vehicle. Using StarSCAN at the "Home" screen:
a. Select "ECU View"
b. Browse the list of controllers using the scroll arrows. Highlight the PCM.
c. Select "More Options"
d. Select "ECU Flash"
e. Highlight the appropriate PCM "Calibration" from the list.
f. Select "Update Controller"
g. When update is completed, select "OK"
NOTE:
Due to the PCM programming procedure, a DTC may be set in other modules (TCM, BCM, MIC, SKREEM, etc.) within the vehicle, if so equipped. Some DTC's may cause the MIL to illuminate. Check all modules using "ECU View" from the Home screen, record the DTC's, and erase these DTC's prior to returning the vehicle to the customer. Erase any DTC's in the PCM only after all other modules have had their DTC's erased. From the "Home" screen select "System View", then select "All DTC's". Select the "Clear All Stored DTC's" if there are any DTC's stored.
NOTE:
The following step is required by law.
14. Type the necessary information on the "Authorized Modification Label" p/n 04275086AB and attach near the VECI label (Fig. 1).
REPAIR PROCEDURE - USING SOFTWARE UPDATE CD TO RETRIEVE THE FLASH FILE:
NOTE:
Before flashing this module, make sure the StarSCAN is operating at the latest level and this is the latest flash file available from the StarSCAN update CD. To determine the latest StarSCAN software version level available refer to website under the "Latest News" link.
NOTE:
If this flash process is interrupted/aborted, the flash should be restarted.
NOTE:
For detailed information on the operation of the StarSCAN, refer to the Quick Reference documentation provided in the StarSCAN documentation kit. In addition, more recent information may also be available at the website. Look under "Training Aids" and also under "Download Center > Frequently Asked Questions" for more help.
1. Retrieve the old PCM part number. Using the StarSCAN at the "Home" screen:
a. Select "ECU View"
b. Touch the screen to highlight the PCM in the list of modules.
c. Record the "Part Number", displayed on the "ECU Overview" screen, for later reference.
2. Insert the USB Key, into the USB port on the TechCONNECT or equivalent PC (Fig. 2).
3. Insert the StarSCAN Software Update CD into the TechCONNECT or equivalent PC. The StarSCAN Software Update CD will start automatically.
a. Select "Controller Flash".
b. Follow the on screen instructions.
4. At the "Select the type of information you wish to enter." screen:
a. If the old "Part Number" was recorded in Step # 1, proceed to Step # 5.
b. If the old "Part Number" is not known, proceed to Step # 6.
5. Select "Enter part number".
a. Follow the on screen instructions. Enter the "Part Number" (use capital letters) recorded in Step # 1 when prompted to do so. Follow the on screen instructions. Select "Next" after each step. Select "Finish" after completing the last step
b. Proceed to Step # 7.
6. Select "Enter YME Information".
a. Follow the on screen instructions. Select "Next" after each step. Select "Finish" after completing the last step.
b. Proceed to Step # 7.
7. Using the mouse highlight the appropriate "Calibration"
a. Select "Save to USB"
b. Follow the on screen instructions. Select "Next" # after each step. Select "Finish" after completing the last step.
8. With the StarSCAN powered OFF, connect the USB Key and Gender Changer to the StarSCAN USB port (Fig. 3).
9. Open the hood, install a battery charger and verify that the charging rate provides approximately 13.5 volts.
10. Connect the StarSCAN to the vehicle.
11. Power ON the StarSCAN.
12. Download the file from the USB key to the StarSCAN. Using the StarSCAN at the "Home" screen:
a. Select "Flash Download"
b. Select "Use USB device"
c. Follow the on screen instructions. Select "Next" # after each step. Select "Finish" after completing the last step.
d. At the "Flash File List" screen, highlight the appropriate PCM "Calibration"
e. Select "Download to Scantool"
f. When the download is complete, select "Close"
13. Download the file from the StarSCAN to the vehicle. Using the StarSCAN at the "Home" screen:
a. Select "ECU View"
b. Browse the list of controllers using the scroll arrows. Highlight the PCM.
c. Select "More Options"
d. Select "ECU Flash"
e. Highlight the appropriate PCM "Calibration" from the list.
f. Select "Update Controller"
g. When update is completed, select "OK"
NOTE:
Due to the PCM programming procedure, a DTC may be set in other modules (TCM, BCM, MIC, SKREEM, etc.) within the vehicle, if so equipped. Some DTC's may cause the MIL to illuminate. Check all modules using "ECU View" from the Home screen, record the DTC's, and erase these DTC's prior to returning the vehicle to the customer. Erase any DTC's in the PCM only after all other modules have had their DTC's erased. From the "Home" screen select "System View", then select "All DTC's". Select the "Clear All Stored DTC's" if there are any DTC's stored.
NOTE:
The following step is required by law.
14. Type the necessary information on the "Authorized Modification Label" p/n 04275086AB and attach near the VECI label (Fig. 1).
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.