DRIVE-CONTROL
COMPONENTS
-
ABS
<FWD>
3-41
NOTE
*l: The ABS-ECU can detect only an open circuit from the moment the ECU power supply is ON.
LJ
The ABS-ECU lights the ABS warning light when it detects an open circuit, but it does not immediately store
the trouble code in memory and does not cause the system to shut down.
When an open circuit is detected, the trouble code is stored in memory and the system caused to shut down
when the vehicle starts and the wheel speed reaches 6 km/h (4 mph) (the first acceleration after the
IG
has
been placed in the ON state).
Troubles other than an open circuit cannot be detected until the wheel speed reaches 6 km/h (4 mph). When
the ABS-ECU detects any of these troubles, it causes the system to shut down and simultaneously lights the
ABS warning light.
When the ABS ECU detects a wheel speed sensor error during ABS control, it causes the system to shut down
and simultaneously lights the ABS warning light.
*2:
The ABS-ECU detects a power supply error when the supplied voltage is a low voltage (approx.
9V
or less).
When the power supply error is detected, it causes the system to shut down and simultaneously lights the ABS
warning light, but does not store the trouble code in memory. The trouble code is stored in memory when the
voltage returns to normal.
When the power voltage is low (approx.
9V
or less), none of the trouble codes is stored in memory.
*3:
The ABS-ECU takes more than 15 minutes from when it detects an error to when it determines that the fault
has occurred.
*4:
The ABS-ECU makes an initial check on the motor relay and motor when the wheel speed reaches 6 km/h
(4 mph) for the first time after engine start. If anything wrong is detected, it causes the system to shut down
and simultaneously lights the ABS warning light.
<Diagnostic Trouble Code Display by ABS Warning
Light>
(1)
The codes for the currently present or previously
tic trouble
codes and goes back to the normal
occurred failures are displayed. Each code is
control mode. Thereafter, if the ABS system
displayed once. After all the codes in store have
is in order, the ABS control is available. If the
been displayed, they are repeatedly displayed,
system is out of order, the warning light
illumi-
L
beginning with the first one.
nates and the brake system is placed in the
(2) If the vehicle is put in motion and any of the
ordinary braking mode. No more codes will be
wheels reaches a speed of more than
IO
km/h
output until the ignition key is placed in the ON
(6 mph) during display of diagnostic trouble
position again.
codes, the system stops displaying the
diagnos-
2. Diagnostic Trouble Code Indication Method
Diagnostic trouble codes are indicated as described
below, depending on failure conditions in the system.
I
System failure condition
I
Display on scan tool
Display by ABS warning light
No failure detected in the past
No diagnostic trouble code displayed. ON/OFF at 0.5 sec. intervals
(no-failure code)
detected in the past
All codes associated with the failures
All codes associated with the failures
that occurred in the past are displayed,
that occurred in the past are displayed,
beginning with the most recent one.
beginning with the most recent one.
NOTE
Even if failures of a same code repeatedly occur, the code that is displayed is the one stored for the first time only.
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