DRIVE-CONTROL
COMPONENTS
-
ABS
<AWD>
3-55
FAIL-SAFE FUNCTION
/
i
Should a failure occur in the ABS system, the
ABS-
ECU isolates the system to retain the vehicle’s ordi-
nary braking function, thus assuring a high measure
of safety.
l If the ABS-ECU determines that the system
is defective as the result of diagnostic test mode,
DIAGNOSTIC FUNCTIONS
To facilitate inspection of the ABS system, the
ABS-
ECU offers the following facilities:
l
Diagnostic trouble code output and erasure
l Actuator test
All of the items described above can be checked
by the scan tool.
Scan Tool
-
ABS Interface
The scan tool function is entered by connecting
the scan tool to the data link connector. At this time,
i
it causes the ABS warning light to light, drives
the valve relay to interrupt control of the solenoid
valves in the HU, and restores the ordinary brak-
ing mode.
the vehicle must be stopped, and the ignition should
be OFF.
The ABS scan tool mode is entered when you select
the ABS system on the scan tool. In this mode,
diagnostic output, data list output and actuator test
functions are available. During an actuator test, how-
ever, the ABS warning light illuminates and anti-lock
control is inhibited to prevent ABS operation when
a brake is temporarily inactivated during the actuator
Scan tool
0
Wheel speeds of 0 km/h (0 mph), parked
condi-
mode entry
tion
condition
Q
Check harness of scan tool connected to data
link connector of vehicle
0
ABS system selected by control switch of scan
tool (Specified serial data received)
NOTE
No communications with the ABS-ECU can be made by con-
necting the scan tool while the vehicle is in operation [wheel
speeds not 0 km/h (0 mph)].
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