6C-47 Power Assisted Steering System:
DTC “C1152”, “C1154”, “C1155” EPS Control Unit Malfunction (LT-A750XP/ZK9)
B931G36304016
Troubleshooting
• Replace the EPS control unit. Refer to “EPS Control Unit Removal and Installation (LT-A750XP/ZK9) (Page 6C-
48)”.
3 1) Turn the ignition switch OFF.
2) Check the EPS control unit coupler for loose or poor
contacts. If OK, then disconnect the EPS control unit
coupler.
3) Start the engine at 5 000 r/min with the dimmer switch
set to HI.
4) Measure the voltage between terminal “A” and terminal
“B” at the coupler.
Special tool
(A): 09900–25008 (Multi circuit tester set)
Tester knob indication
Voltage ( )
Is the voltage same as Step 2?
Replace the EPS
control unit.
Inspect the wire
harness. (Faulty ignition
or ground wire)
Step Action Yes No
“A”
“B”
(A)
(A)
(ޓ)
(–)
I931G3630040-01
Possible Cause
C1152 • Relay welding (EPS control unit internal circuit)
C1154 • Relay malfunction (EPS control unit internal circuit)
C1155 • EPS control unit malfunction
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