Lancer LS L4-2.0L SOHC (2002)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
A/C - Poor Heater Performance in Extreme Cold
No: TSB-05-55-004
DATE: 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.
