Nissan Teana J32. Manual - part 1111

POWER STEERING CONTROL UNIT

STC-13

< ECU DIAGNOSIS >

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

ECU DIAGNOSIS

POWER STEERING CONTROL UNIT

Reference Value

INFOID:0000000003893535

TERMINAL LAYOUT

PHYSICAL VALUES

JSGIA0023ZZ

Terminal No.

(Wire color)

Description

Condition

Value (Approx.)

+

-

Signal name

Input/

Output

1

(R/Y)

Ground

Power steering solenoid 
valve voltage

Output

Vehicle speed: 0 km/h (0 MPH)
(Engine is running)

4.4 – 6.6 V

Vehicle speed: 100 km/h (62 MPH)

2.4 – 3.6 V

3

(G/W)

Ground

Ignition switch power 
supply

Input

Ignition switch: ON

Battery voltage

Ignition switch: OFF

0 V

5

(LG)

Ground

Power steering solenoid 
valve ground

—

Always

0  V

6

(B)

Ground

Ground

—

Always

0 V

8

(L/B)

Ground

Vehicle speed signal

Input

Vehicle speed: 40 km/h (25 MPH)

CAUTION:

Check air pressure of tire under 
standard condition.

10

(V/W)

Ground

Engine speed signal

Input

Engine is running
• Warm-up condition
• Idle speed

Engine is running
• Warm-up condition
• Engine speed: Approx. 2,000 rpm

JSNIA0015GB

JSGIA0143ZZ

PBIA3655J

STC-14

< ECU DIAGNOSIS >

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:0000000003893536

JCGWM0089GB

POWER STEERING CONTROL UNIT

STC-15

< ECU DIAGNOSIS >

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

Fail-Safe

INFOID:0000000003893835

EPS system

JCGWM0090GB

STC-16

< ECU DIAGNOSIS >

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.

JSGIA0426GB

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.