ABS <4WD> -
Troubleshooting
35B-20
Inspection procedure 3
The ABS warning lamp does not illuminate when the
ignition key is turned to ON (engine stopped).
Probable cause
When power is first supplied to the ABS-ECU, the ABS-ECU turns the ABS-ECU
valve relay from off to on, off and back to on again as part of its initial check.
Accordingly, if the ABS warning lamp does not illuminate, the cause is probably
an open circuit in the ABS warning lamp power supply circuit, a blown lamp bulb
or an open circuit between the ABS warning lamp and the ABS-ECU.
D
Blown fuse
D
Blown ABS warning lamp bulb
D
Malfunction of ABS valve relay
D
Malfunction of harness or connector
D
Malfunction of combination meter
D
Malfunction of the ABS-ECU
NG
Replace the combination meter.
NG
Repair
OK
NG
Check for a blown bulb.
Replace the ABS
warning lamp bulb.
OK
NG
Repair
OK
Check the trouble symptoms.
Multi- purpose fuse No. 6 check
NG
Refer to GROUP 00 – Inspection service Points for Blown
Fuse.
NG
Check the harness wire.
D
Between ignition switch and combination meter
D
Between the combination meter and the ABS-ECU
OK
OK
After replacing the ABS-ECU, carry out the following check.
D
Check the harness wire between the ABS warning lamp,
ABS valve relay and earth.
Check the following connector:
E-107
NG
Repair
Check the trouble symptoms.
OK
NG
Check the following connectors:
D-01, D-208, D-210
<L.H.D.>, D-213 <R.H.D.>, E-10, E-107
Measure at the ABS-ECU connector E-107.
D
Disconnect the connector and measure at the harness
side.
D
Ignition switch: ON
D
Warning lamp condition when terminal 50 is shorted to
body earth
OK:
Illuminates
Inspection procedure 4
The ABS warning lamp remains illuminated after the
engine has started.
Probable cause
The cause is probably a short-circuit in the ABS warning lamp illumination circuit.
D
Malfunction of combination meter
D
Malfunction of harness (short-circuit)
D
Malfunction of the ABS-ECU
NOTE
This trouble symptom is limited to cases where communication with the MUT-II is possible(ABS-ECU
power supply is normal) a nd the diagnosis code is a normal diagnosis code.
When the ABS valve relay connector B-21X and the
ABS-ECU connector E-107 are disconnected and the ignition
switch is turned to the ON position, does the ABS warning
lamp remain illuminated?
YES
NO
Replace the ABS-ECU.
Replace the combination meter.
NG
Repair
OK
Check the harness wire.
D
Between the ABS warning lamp, the ABS-ECU and the
ABS valve relay
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