EPS Warning Lamp Does Not Turn Off

EPS Warning Lamp Does Not Turn OFF

SYMPTOM: EPS warning lamp does not turn OFF for several seconds after starting the engine.

DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to STC-13, "SELF-DIAG RESULTS MODE". Electronically Controlled Power Steering System (EPS)
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 2.

2. CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect EPS control unit harness connector.








3. Turn ignition switch ON. (Do not start engine.)
4. Check voltage between EPS control unit harness connector (A) terminals and ground.








5. Turn ignition switch OFF.
6. Check voltage between EPS control unit harness connector (A) terminals and ground.
7. Connect EPS control unit harness connector.
OK or NG
OK >> GO TO 3.
NG >> Check the following. If any items are damaged, repair or replace damaged parts.
^ 60 A fusible link (letter f, located in the fuse and fusible link box).
^ 10 A fuse [No. 12, located in the fuse block (J/B).
^ Harness for short or open between battery and EPS control unit harness connector E202 terminal 1.
^ Harness for short or open between ignition switch and EPS control unit harness connector M37 terminal 3.

3. CHECK EPS CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect EPS control unit harness connector.








3. Check continuity between EPS control unit harness connector (A) terminal and ground.
Also check harness for short to power.
4. Connect EPS control unit harness connector.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.

4. CHECK EPS CONTROL UNIT
Check EPS control unit input/output signal. Refer to STC-11, "EPS Control Unit Input/Output Signal Reference Values". EPS Control Unit Input/Output Signal Reference Values
OK or NG
OK >> GO TO 5.
NG >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.

5. SYMPTOM CHECK
Check again.
OK or NG
OK >> INSPECTION END
NG >> Replace combination meter.