Service manual

ELEC
104
CHECKING THE ANTI-LOCK BRAKE
SYSTEM
1. Only the ABS warning light fail to come on
when the main switch is turned ON.
2. All ABS warning and other indicator lights
fail to come on.
1. ABS coupler and wire harness.
• Check the ABS coupler and wire harness
for continuity.
• Check the ECU and ABS wire harness for
continuity.
Refer to “CIRCUIT DIAGRAM”.
• Is the anti-lock brake system’s wiring prop-
erly connected and without defects?
OK
NO
• Properly connect or
replace the ABS
coupler and wire
harness.
• Properly connect or
replace the ECU
and fail-safe relay
and wire harness.
2. ABS warning light
• Connect the ABS test coupler and ABS test
coupler adapter.
ABS test coupler adapter warning light
terminal (white/red)
→ Battery Negative lead
• Does the ABS warning light come on?
OK
NO
Replace the ABS
warning light.
3. ABS warning light circuit.
• Remove the ECU coupler and check the
continuity at the white/red terminal on the
ECU side and the test coupler adapter side
of the wire harness.
• Is the ECU continuity OK?
YES
NO
Replace the ECU. Properly connect or
replace the ABS
coupler and wire
harness.
1. Main switch.
• Check the main switch for continuity.
Refer to “CHECKING THE SWITCHES”.
• Is the main switch OK?
YES
NO
Replace the main
switch.
2. Battery.
• Check the condition of the battery.
Refer to “CHECKING AND CHARGING
THE BATTERY” in chapter 3. (Manual No.:
5PS1-AE1)
Open-circuit voltage
12.8 V or more at 20°C
• Is the battery OK?
YES
NO
• Clean the battery
terminals.
• Recharge or re-
place the battery.
ANTI-LOCK BRAKE SYSTEM (ABS)