Infiniti EX35. Manual - part 1397

STC-14

< ECU DIAGNOSIS >

[EPS]

POWER STEERING CONTROL UNIT

CAUTION:

When using circuit tester or oscilloscope to measure voltage for inspection, be sure not to forcibly extend any connector ter-
minals.

Wiring Diagram - ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM -

INFOID:0000000003738699

JCGWM0077GB

POWER STEERING CONTROL UNIT

STC-15

< ECU DIAGNOSIS >

[EPS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

JCGWM0078GB

STC-16

< ECU DIAGNOSIS >

[EPS]

POWER STEERING CONTROL UNIT

Fail-Safe

INFOID:0000000003552484

EPS system

JCGWM0079GB

POWER STEERING CONTROL UNIT

STC-17

< ECU DIAGNOSIS >

[EPS]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

• EPS system enters the fail-safe mode (that allows the steering

force to be controlled without impairing the drivability) if any of the
input/output values to/from EPS system (power steering control
unit) deviate from the standard range.
NOTE:
The system enters the fail-safe mode if the engine speed remains
at 1,500 rpm or more for over 10 seconds while the vehicle is
stopped. This is normal.

• The fail-safe function is canceled when a vehicle speed signal of 2

km/h (1.2 MPH) or more is inputted or the ignition switch is turned
OFF

→

ON. EPS system restores the normal operation at that time.

JSGIA0368GB

Mode

Warn-

ing lamp

DTC

Detection point (malfunction part)

Error area and root cause

Fail-safe 

function

—

—

Vehicle speed signal input

• Engine speed is 1,500 rpm or more and there is no vehicle 

speed signal input for over 10 seconds during vehicle travel.

• Vehicle speed signal has abruptly dropped from 30 km/h (19 

MPH) or more to 2 km/h (1.2 MPH) or less within 1.4 sec-
onds.