Power Assisted Steering System: 6C-34
Step Action Yes No
1 1) Turn the ignition switch OFF.
2) Check the EPS control unit power source couplers for
loose or poor contact. If OK, measure the torque sensor
input voltage.
3) Disconnect the torque sensor coupler.
4) Turn the ignition switch ON.
5) Measure the voltage between R wire “A” and B wire “B”.
If OK, then measure the voltage at the R wire “A” and
ground.
Special tool
(A): 09900–25008 (Multi circuit tester set)
Tester knob indication
Voltage ( )
Torque sensor input voltage
5.0 V
Is voltage OK?
• If wire and
connection are OK,
intermittent trouble or
faulty EPS body
assembly.
• Replace the EPS
body assembly with a
known good one, and
inspect it again. Refer
to “EPS Body
Assembly Removal
and Installation (LT-
A750XP/ZK9)
(Page 6C-50)”.
• Power supply circuit
(R wire) shorted to
ground.
• If check result is not
satisfactory, replace
the EPS control unit
with a new one. Refer
to “EPS Control Unit
Removal and
Installation (LT-
A750XP/ZK9)
(Page 6C-48)”.
I931G3630029-01
“A”
“B”
(A)
I931G3630027-01
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