Infiniti FX35, FX50 (S51). Manual - part 1768

ENGINE SPEED SIGNAL CIRCUIT

STC-13

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

NO

>> Repair or replace damaged parts.

STC-14

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT REAR ACTIVE STEER]

VEHICLE SPEED SIGNAL CIRCUIT

VEHICLE SPEED SIGNAL CIRCUIT

Description

INFOID:0000000005235344

Unified meter and A/C amp. sends vehicle speed signal to power steering control unit.

Diagnosis Procedure

INFOID:0000000005235345

1.

PERFORM UNIFIED METER AND A/C AMP. SELF-DIAGNOSIS

With CONSULT-III

1.

Turn the ignition switch ON.

2.

 Perform “METER/M&A” self-diagnosis. Refer to 

MWI-45, "CONSULT-III Function (METER/M&A)"

.

Is any DTC detected?

YES

>> Check the DTC.

NO

>> GO TO 2.

2.

CHECK HARNESS BETWEEN UNIFIED METER AND A/C AMP. AND POWER STEERING CONTROL

UNIT

1.

Turn the ignition switch OFF.

2.

Disconnect unified meter and A/C amp. harness connector.

3.

Disconnect power steering control unit harness connector.

4.

Check continuity between unified meter and A/C amp. harness connector and power steering control unit
harness connector.

5.

Check continuity between power steering control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

CHECK VEHICLE SPEED SIGNAL (1)

1.

Connect unified meter and A/C amp. harness connector.

2.

Check unified meter and A/C amp. input/output standard values. Refer to 

MWI-96, "Reference Value"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace unified meter and A/C amp. Refer to 

MWI-147, "Exploded View"

.

4.

CHECK VEHICLE SPEED SIGNAL (2)

1.

Turn the ignition switch OFF.

2.

Connect power steering control unit harness connector.

3.

Check signal between power steering control unit harness connector and ground with oscilloscope.

Unified meter and A/C amp.

Power steering control unit

Continuity

Connector

Terminal

Connector

Terminal

M66

8

M108

8

Existed

Power steering control unit

—

Continuity

Connector

Terminal

M108

8

Ground

Not existed

VEHICLE SPEED SIGNAL CIRCUIT

STC-15

< DTC/CIRCUIT DIAGNOSIS >

[WITHOUT REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace power steering control unit. Refer to 

STC-27, "Removal and Installation"

.

5.

CHECK TERMINALS AND HARNESS CONNECTORS

• Check power steering control unit pin terminals for damage or loose connection with harness connector.
• Check unified meter and A/C amp. pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair or replace damaged parts.

Power steering control unit

—

Condition

Voltage (Approx.)

Connector

Terminal

M108

 8

Ground

Vehicle speed: 40 km/h (25 MPH)

CAUTION:

Check air pressure of tire under 
standard condition.

NOTE:
The maximum voltage varies de-
pending on the specification (desti-
nation unit).

JSNIA0015GB

STC-16

< ECU DIAGNOSIS INFORMATION >

[WITHOUT REAR ACTIVE STEER]

POWER STEERING CONTROL UNIT

ECU DIAGNOSIS INFORMATION

POWER STEERING CONTROL UNIT

Reference Value

INFOID:0000000005235346

TERMINAL LAYOUT

PHYSICAL VALUES

JSGIA0023ZZ

Terminal No.

(Wire color)

Description

Condition

Value (Approx.)

+

-

Signal name

Input/

Output

1

(LG)

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)

Ground

Ignition switch power 
supply

Input

Ignition switch: ON

Battery voltage

Ignition switch: OFF

0 V

5

(B)

Ground

Power steering solenoid 
valve ground

—

Always

0  V

6

(B)

Ground

Ground

—

Always

0 V

8

(L)

Ground

Vehicle speed signal

Input

Vehicle speed: 40 km/h (25 MPH)

CAUTION:

Check air pressure of tire under 
standard condition.

NOTE:
The maximum voltage varies de-
pending on the specification 
(destination unit).

JSNIA0015GB