Diagnosis Procedure
- CHECK IGNITION POWER SUPPLY FOR EPS CONTROL UNIT
- Turn ignition switch OFF.
- Disconnect EPS control unit harness connector.
- Check voltage between EPS control unit harness connector terminals and ground.
+
--
Voltage
(Approx.)
EPS control unit
Connector
Terminal
M43
4
Ground
Approx. 0 V
- Turn ignition switch ON.CAUTION: Never start the engine.
- Check voltage between EPS control unit harness connector and ground.
+
--
Voltage
(Approx.)
EPS control unit
Connector
Terminal
M43
4
Ground
10.5 - 16 V
Is the inspection result normal?
YES
GO TO 3.
NO
GO TO 2.
- CHECK IGNITION POWER SUPPLY CIRCUIT FOR EPS CONTROL UNIT
- Turn ignition switch OFF.
- Check the 10A fuse (#30).
- Check continuity between EPS control unit harness connector and the fuse block (J/B).
EPS control unit
Fuse block (J/B)
Continuity
Connector
Terminal
Connector
Terminal
M43
4
M49
7B
Existed
Is the inspection result normal?
YES
Perform the trouble diagnosis for ignition power supply circuit.
NO
Repair or replace error-detected parts.
- CHECK BATTERY POWER SUPPLY FOR EPS CONTROL UNIT
- Turn ignition switch OFF.
- Check voltage between EPS control unit harness connector terminals and ground.
+
--
Voltage
(Approx.)
EPS control unit
Connector
Terminal
M44
9
Ground
10.5 - 16 V
- Turn ignition switch ON.CAUTION: Never start the engine.
- Check voltage between EPS control unit harness connector terminals and ground.
+
--
Voltage
(Approx.)
EPS control unit
Connector
Terminal
M44
9
Ground
10.5 - 16 V
Is the inspection result normal?
YES
GO TO 5.
NO
GO TO 4.
- CHECK BATTERY POWER SUPPLY CIRCUIT FOR EPS CONTROL UNIT
- Turn ignition switch OFF.
- Check the 50A fusible link (F).
- Check the 50A fusible link (H).
- Check the harness for open or short between EPS control unit harness connector No. 9 terminal and the 50A fusible link (F).
- Check the harness for open or short between EPS control unit harness connector No. 9 terminal and the 50A fusible link (H).
Is the inspection result normal?
YES
Perform the trouble diagnosis for power supply circuit.
NO
Repair or replace error-detected parts.
- CHECK EPS CONTROL UNIT GROUND CIRCUIT
Check continuity between EPS control unit harness connector and ground.
EPS control unit
--
Continuity
Connector
Terminal
M44
10
Ground
Existed
Is the inspection result normal?
YES
GO TO 6.
NO
Repair or replace error-detected parts.
- CHECK TERMINAL
- Turn ignition switch OFF.
- Check EPS control unit pin terminals for damage or loose connection with harness connector.
- Check fuse block (J/B) pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
INSPECTION END
NO
Repair or replace error-detected parts.