Sonata GL V6-3.0L (1997)
Idle Speed: By Symptom
Technical Service Bulletin # 98-40-003
Date: 980601
A/T - Harsh 3-2 Downshift
Group: TRANSAXLE
Number: 98-40-003
Date: JUNE, 1998
Model: 1997-98 SONATA 3.0L
Subject
1997-98 SONATA 3.0L HARSH 3-2 DOWNSHIFT
DESCRIPTION:
Some 1997-98 Sonata 3.0L vehicles may exhibit a harsh 3-2 downshift. The condition occurs when driving at a steady speed of 40-45 mph in 4th gear,
then accelerating at wide open throttle (WOT). During the downshift from 4-3-2, a harsh downshift is felt. If a vehicle experiences this condition, please
follow the diagnostic procedure shown.
DIAGNOSTIC PROCEDURE:
1.
Inspect the automatic transaxle fluid (ATF) level in "NEUTRAL" with the ATF at normal operating temperature (70-90°C, 158-194° F)
A.
If the oil level is low, add ATF to bring the level to the top of the "Full" mark.
B.
Inspect the ATF color and smell. If the ATF is black and smells burned, remove the transaxle oil pan. If metal particles and clutch material
are found in the oil pan, replace the transaxle.
2.
Attach the scan tool to the data link connector (DLC) and select the year, model, and then the "Transaxle" menu.
A.
Select "Codes" and check for diagnostic codes (DTC). If DTCs are found, repair the condition.
B.
Select "Data" and "Idle Switch". Check that the idle switch reads as shown. If not, adjust or replace the idle switch. (For idle switch
adjustment procedures, see TSB # 97-40-029)
^
Engine idling - Idle switch reads "On" or "Closed"
^
Engine rpm increased to 50-100 rpm above idle - Idle switch reads "Off" or "Open"
3.
Adjust the kickdown servo to the specification shown in the 1997 Sonata Shop Manual, Page ATa-39 or 1998 Sonata Shop Manual, Page
ATa-136.
4.
If Steps 1-3 show all components to be within specification, no DTCs are found and the vehicle is produced after July 1, 1997, replace the
transaxle control module (TCM) with the part number shown. (Refer to TSB # 96-40-003-1 for instructions for replacing the TCM.)
