Speed Sensor Circuit Inspection - Toyota Hilux Surf 1993 Owner's Manual

INSPECTION OF SPEED SENSOR CIRCUIT
SPEED METER CABLE
INSPECT SPEED METER CABLE
Does not meter fluctuate when driving at a
steady speed?
Turn ignition switch off.
SPEED SENSOR
Disconnect connector from combination
meter.
INSPECT GROUND CONNECTION
Is there continuity between terminal6 of wire
harness side connector and ground?
INSPECT SPEED SENSOR OPERATION
Is there sensor operation normal?
(See page BE–33).
Connect connectors to combination meter.
ECU
Disconnect connector from CC ECU and in–
spect connector on wire harness side as fol–
lows.
Turn ignition switch on.
INSPECT SPEED SENSOR CIRCUIT
Does the voltage between terminal 8 and
ground change repeatedly from OV to approx.
5V or more when speedometer shaft is
turned?
CC ECU faulty.
Replace CC ECU. Then recheck system.
BODY ELECTRICAL SYSTEM
Yes
Yes
Yes
– Cruise Control System
Yes
Meter cable faulty.
Replace meter cable. Then recheck system.
• Open circuit in wire harness between
terminal B of combination meter and
ground.
• Ground faulty.
Speed sensor faulty.
Replace speed sensor. Then recheck sys–
tem.
Open or short circuit in wire harness
between terminal 8 of CC ECU and termi–
nal A of combination meter.
BE–71