A/T - Neutral Control Function

NO: 43-38

DATE: 2-9-2006

MODEL/YEAR:
MY 2001-2002 S60 / V70 / V70 XC

SUBJECT:
AW 55 Neutral Control Function

Note:
This TNN superseded the previous 43-38. dated 6-11-2004. Please update your files.

DESCRIPTION:

A function called "Neutral Control" is present on all 2001 V70 and S60 cars. It is also present on 2002 non-turbo V70 and S60 cars built before January 2002. When the vehicle comes to a stop, the Transmission Control Module (TCM) activates Neutral Control. Even though the gear selector is in the Drive position, a Neutral condition is engaged hydraulically in the transmission. Neutral Control disengages when the brake pedal is released or the throttle is applied.

SYMPTOMS:

When the neutral control function is incorrect, there are three symptoms that can be felt in the car;

1. After coming to a complete stop and keeping the brakes applied, a "thump" can be felt in the car. It is felt about 2 seconds after coming to a stop.

2. When releasing the brake there is a harsh or double re-engagement of drive.

3. When idling in 'D' range with the brake applied, the engine speed oscillates (fluctuates).

In addition to these symptoms, some cars may set a DTC 012A or 012B in the TCM; which should be erased before downloading the software.

Note that Neutral Control is not active during the following;

^ Transmission in 'W' mode

^ Transmission in Geartronic mode

^ Gear selector in 'L' range (non-Geartronic shifter)

^ Operating with high AC demand (higher idle speed)

SERVICE:

Upgrade the TCM (Software Product number 30677036). In addition to correcting the Neutral Control symptoms, this Software package also improves response during Power-On Downshifts and minimizes 2-3 Shift Flare. There is no need to reset the adaptation to zero.





Warranty Information