Specifications
29
Testing Testing ABS and Traction Control Systems
Special Functions
The Special Functions selection from the Functional Tests menu for transmission systems can
work differently than for other systems, depending on the type of transmission. See “Special
Functions” on page 17 for instructions on resetting adaptations.
Important Tips for Resetting Transmission Adaptations
•
On some transmissions, the Special Functions menu may have only one selection which
reads Reset All Adaptations.
• Using the scan tool to reset transmission adaptations for either EGS or AGS transmissions
only clears the adaptive pressure control values. EGS/AGS shift adaptation to driving style is
not cleared with the scan tool because it is not stored in long-term memory. The transmission
learns with each new key cycle. Clearing adaptive pressure control values can temporarily
cause bad shift quality until the transmission has completed the adaptation. Do not reset
adaptation (pressure) values for shift complaints. Only reset after a transmission repair or
replacement. After performing an adaptation reset, cycle the ignition switch off for 10 seconds,
then on again before continuing (or engine may not start).
• Similar version transmission control systems in the same year may differ between models.
• On most 1990–95 vehicles, adaptations reset automatically when the battery is discharged or
disconnected, but on most 1996 and newer vehicles, transmission adaptations must be reset
using the scan tool.
4.3 Testing ABS and Traction Control Systems
The scan tool offers the following testing options for ABS and traction control systems.
• Codes
• ECU identification
NOTE:
i The ABS dash lamp may light up during scan tool communications with the ABS connector.
4.3.1 ABS and Traction Control Applications
The scan tool communicates with the traction control systems (ABS/ASC/DSC) in Table 4-10.
Table 4-10 Traction control types applications (sheet 1 of 2)
ESeries Year System Scan Tool Name Description
E32/E34 M30
E32 M70
E31 M70A
1988–90 ASC
No scan tool
diagnostics; flash
codes only
Bosch: slip control only
E32 M70
E31 M70A
1990–91 ASC+T
No scan tool
diagnostics; flash
codes only
Bosch: slip control + traction
(cuts engine power)