Infiniti FX35, FX50 (S51). Manual - part 1770

POWER STEERING CONTROL UNIT

STC-21

< ECU DIAGNOSIS INFORMATION >

[WITHOUT REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

JCGWA0240GB

STC-22

< ECU DIAGNOSIS INFORMATION >

[WITHOUT REAR ACTIVE STEER]

POWER STEERING CONTROL UNIT

JCGWA0241GB

POWER STEERING CONTROL UNIT

STC-23

< ECU DIAGNOSIS INFORMATION >

[WITHOUT REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

Fail-Safe

INFOID:0000000005235348

EPS system

JCGWA0242GB

STC-24

< ECU DIAGNOSIS INFORMATION >

[WITHOUT REAR ACTIVE STEER]

POWER STEERING CONTROL UNIT

• 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 

—

—

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.