ABS <4WD> ± Troubleshooting
35B-15
Inspection Procedure 2
Communication between MUT-II and the ABS-ECU is not
possible.
Probable cause
The cause may be an open circuit in the ABS-ECU power supply circuit or an open
circuit in the diagnosis output circuit.
D Blown fuse
D Malfunction of wiring harness or connector
D Malfunction of hydraulic unit and ABS-ECU
NG
NG
NG
Repair
NG
Check the harness wire, and repair if necessary.
D Between ABS-ECU and diagnosis connector
OK
NG
Repair
NG
Check the harness wire, and repair if necessary.
D Between ignition switch and ABS-ECU
OK
NG
Repair
NG
Check the harness wire, and repair if necessary.
D Between ABS-ECU and earth
NG
Repair
NG
Replace the hydraulic unit and ABS-ECU.
OK
Check the trouble symp-
tom.
OK
Check the trouble symp-
tom.
OK
Check the following connector: A-58
Measure at the ABS-ECU connector A-58.
D Disconnect the connector, and measure at the harness side
connector.
D Continuity between 21 and body earth, and between 23 and
body earth
OK: Continuity
Check the following connector: A-58
OK
Check the trouble symp-
tom.
Measure at the ABS-ECU connector A-58.
D Disconnect the connector, and measure at the harness side
connector.
D Ignition switch: ON
D Voltage between 10 and body earth
OK: System voltage
Check the following connectors: A-58, C-40 <R.H. drive
vehicles>, C-02 <R.H. drive vehicles>, C-78 <L.H. drive vehicles>,
C-76 <R.H. drive vehicles>, C-74
OK
Check the trouble symp-
tom.
Measure at the diagnosis connector C-35 and the ABS-ECU con-
nector A-58.
D Disconnect the connectors, and measure at the harness side
connectors.
D Continuity between the following terminals
ABS-ECU side ± Diagnosis connector side
19 ± 1
9 ± 7
OK: Continuity
NG
Check the following connectors: A-58, C-28 <L.H. drive
vehicles>, C-40 <R.H. drive vehicles>, C-70, C-35
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