A/T - Cold Acceleration in 2ND Gear

Group: TRANSAXLE

Number: 97-40-021

Date: JULY, 1997

Model: ALL

Subject:
VEHICLE ACCELERATION WHEN COLD
(2ND GEAR AUTOMATIC SELECTION)

DESCRIPTION:

Following an initial "cold" start, when the transaxle is shifted from "Park" to "Drive", up to 1.5 seconds may pass before the transaxle shifts into gear. The transaxle initially shifts into 2nd gear to reduce vehicle "creep" at idle when the transaxle is in "Drive". When the accelerator is pressed, the transaxle will shift into 1st gear. If the accelerator is pressed before the initial shift into 2nd gear (creep) is completed, the driver may feel the transaxle shift into 2nd gear and then into 1st gear.

This shift engagement into 2nd and then 1st feels more noticeable when the automatic transaxle fluid (ATF) is cold. For this reason, the logic of the transaxle control module (TCM) is designed to improve the shift engagement feeling when the ATF is below the temperatures shown below. Below these temperatures, the transaxle will accelerate from a stop in 2nd gear without downshifting into 1st gear. Originally, this temperature specification was 0°C (32°F), but was changed to 11°C (52°F) (36°C (97°F) for the Sonata 3.0L) on the production dates shown below.

If a customer comments that the vehicle has poor acceleration or seems to accelerate in 2nd gear during the first acceleration in the morning, please explain the above information to the customer.

(SEE TABLE BELOW FOR EFFECTIVE VEHICLE PRODUCTION DATE AND VIN)





EFFECTIVE PRODUCTION DATE AND VIN: