Aw 55 Neutral Control Function (43-38)
Publication date: 2006-02-09Reference number: 43-38
AW 55 NEUTRAL CONTROL FUNCTION
TECHNICAL SERVICE BULLETIN
| VOLVO: | MY 2001-2002 S60 / V70 / V70 XC |
| GROUP: | 43 |
| NO.: | 38 |
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:
- 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.
- When releasing the brake there is a harsh or double re-engagement of drive.
- 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 CLAIM INFORMATION
| LABOR OP | LABOR DESCRIPTION | LABOR TIME |
|---|---|---|
| 36004-2 | Software Download | .3 hr. |
| Claims may be submitted under the New Car warranty when there is a documented customer complaint using claim type: 01 | ||