В ответ на: как я починял ETS : отчётИК-кому интересно, отправленное EPU 06 Марта 2005 г. в 00:55
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.
Electronic Throttle System (ETS) utilizes a throttle cable
only as an emergency limp-home measure, as it is an electronic (as
opposed to mechanical) throttle operating system. Throttle is operated
by a Pulse-Width Modulated (PWM) DC motor. ETS/ECU is located under
driver’s seat.
ETS components of system include a 38-pin ECU, throttle
housing assembly, pedal potentiometer, and solenoid valves. ETS ECU is
identical for both manual and automatic transmission versions. If a
new ECU is installed, it must be calibrated in order to identify which
version car it is being used on.
Automatic Slip Reduction (ASR) components of system include
25-pin ECU and Kickdown Wire (KDW) motor. See Fig. 5. ASR ECU is
located on ETS ECU, under driver’s seat. See Fig. 6. ASR system
operates in much the same way as manual transmission version, except
it is much more sensitive. Generally, the driver is not aware of its
operation other than that the TCS light is on.
TC/ABS ECU receives signals from 4 wheel sensors which
provide input on wheel speed. TC/ABS ECU also receives signals from
monitoring circuit for hydraulic pressure and brake fluid level.
Pressure switch in TC block sends signals to TC/ABS ECU with
information on whether the brake is activated and whether TC or ABS
mode is operative (manual transmission version only). See Fig. 7.
Signal from pressure switch is compared with input signal from brake
light switch. TC/ABS ECU also communicates with ETS ECU. TC/ABS ECU is
located on battery shelf. ETS ECU is located under driver’s seat.
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