Tuesday, January 31, 2012
1993 Saab 9000 TRACTION CONTROL SYSTEM
DESCRIPTION Saab Traction Control System (TCS) operates in tandem with appropriate Anti-lock Braking (ABS) system. Saab 9000 series vehicles are equipped with Mark IV ABS. TCS is made up of 2 subsystems: ABS and Electronic Throttle System (ETS). System also incorporates a cruise control function. An additional Automatic Slip Reduction (ASR) system is used on automatic transmission models. TCS uses many components already included in ABS system, including wheel sensors, hydraulic unit and valve block. TCS system consists of 2 different variations, one for manual transmission and one for automatic transmission. See Figs. 1 and 2. Manual transmission TCS has capability to apply front brakes independently during low speed wheel spin and also close throttle valve to reduce wheel spin at any speed. Automatic transmission TCS does not have capability to apply brakes during wheel spin conditions. Automatic transmission TCS does control operation of transmission kickdown cable in addition to controlling throttle valve. ABS components of system include a 55-terminal ECU (located on battery shelf), ABS hydraulic unit (with traction control valve block on manual transmission version), wheel speed sensors, and warning lights. See Fig. 3. download
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