A/C - Poor Heater Performance in Extreme Cold
No: TSB-05-55-004DATE: December, 2005
MODEL: 2002-06 Lancer
SUBJECT:
INSUFFICIENT HEATER
PERFORMANCE
PURPOSE
In extremely cold ambient temperatures under the conditions described below, the heater performance may be insufficient to heat the vehicle interior while the engine is idling. This is due to inappropriate coolant flow volume, which can be improved by changing the PCM software parameters. If a customer complains of this condition, reprogram the PCM as described in this bulletin.
Condition:
- Fan setting: High
- Air Outlets: Face mode
- Intake air temperature below -4 degrees F (-20 degrees C) just after engine start-up
or
Intake air temperature below 1 degree F (-17 degrees C) at idle after driving over 19mph (30 kph)
After reprogramming, the engine idle rpm will be changed as shown.
AFFECTED VEHICLES
2002-2006 Lancer models equipped with 2.0L SOHC engine
PROCEDURE
CAUTION
BATTERY VOLTAGE (AS MEASURED AT THE BATTERY POSTS WITHOUT ELECTRICAL LOAD) MUST BE 12.4V OR HIGHER IN ORDER TO REPROGRAM THE PCM.
1. Check the underside of the hood to verify that there is no label previously installed to indicate that this PCM reprogramming has already been done.
2. Verify that the vehicle's POM part number is listed in the table in Step II of this bulletin.
a. Verify whether the ROM ID is the same as the ROM ID listed in the table in Step II. If the ROM ID is the same as or higher than the ROM ID in the table, the PCM has already been reprogrammed for this concern.
3. Note any DTCs set in the POM. Then use the MUT-III to erase all DTCs.
4. Verify that your MUT-Ill has the most current version of the reprogramming database:
a. Select "Special Function", then select "ECU Reprogramming."
b. Select "Database File Display". The database version is displayed in the top right corner of the screen. Make sure the database version is N051 11 or greater.
c. If the database version is less than N05111, go to Step 5.
d. If the database version is N05111 or greater, go to Step 8.
5. Turn the ignition key to OFF and disconnect the MUT-III.
6. Gather the following reprogramming equipment:
- MUT-III / STV Reflash Update CD 12105 or later
- Memory Card 128 MByte Compact Flash MB991853
- Memory Card Adapter PCMCIA MB991939
- Engine Compartment/Control Module" Labels p/n MSSF-024G-00
7. Install Reflash Update CD 12105 in the MUT-III laptop. Follow the CD installation instructions.
8. Transfer the reprogramming data from the laptop to the memory card.
9. Remove the memory card from the laptop and install it in the VCI. Connect the VCI to the vehicle. YOU MUST DISCONNECT THE MUT-III LAPTOP.
10. MODELS EQUIPPED WITH ABS: With the ignition key OFF, unplug the ABS fuse (7.5 amp fuse in junction box in passenger compartment).
11. Reprogram the PCM, using automatic reprogramming. For reprogramming details, refer to TSB-03-00-015. It will take up to 20 minutes to complete the reprogramming.
NOTE:
If the message "ECU at Current Level of VCI" appears, the PCM did not reprogram. Verify that the ROM ID is the same as the ROM ID listed in the table.
^ If the ROM ID is the same as or higher than the ROM ID in the table, the PCM has been reprogrammed for this concern.
^ If it is not, verify that the correct database update is in the MUT-III and was transferred to the memory card, and that the memory card is properly installed in the VCI.
CAUTION
DO NOT DISTURB THE HARNESS CABLES OR CONNECTIONS. INTERRUPTION DURING THE PROGRAMMING PROCESS COULD CAUSE THE PCM TO LOSE DATA OR PREVENT FUTURE PCM REPROGRAMMING.
a. After reprogramming is completed, the new ENG ROM ID and new All ROM ID will display alternately with the message "Turn IG SW OFF" every four seconds. Note this information. Verify that the new PCM part number and ROM IDs are the same as those listed in the table.
13. Carefully remove all dirt and oil from a vacant area near the VECI label on the underside of the hood, and affix the Engine Compartment label.
14. Affix the Control Module label to the PCM.
15. MODELS EQUIPPED WITH ABS: Reinstall the ABS fuse.
16. FOR VEHICLES REGISTERED IN CALIFORNIA ONLY: Complete a "VEHICLE EMISSION RECALL - PROOF OF CORRECTION" form (p/n MSSF-106D-00). Give the completed form 10 Ihe vehicle owner.
WARRANTY INFORMATION