Nissan Maxima. Manual - part 1126

STC-10

< DTC/CIRCUIT DIAGNOSIS >

ENGINE SPEED SIGNAL CIRCUIT

ENGINE SPEED SIGNAL CIRCUIT

Description

INFOID:0000000009466557

ECM sends engine speed signal to power steering control unit.

Diagnosis Procedure

INFOID:0000000009466558

Regarding Wiring Diagram information, refer to 

STC-17, "Wiring Diagram"

.

1.

PERFORM ECM SELF-DIAGNOSIS

With CONSULT

Perform ECM self-diagnosis.
Is any error system detected?

YES

>> Check the error system.

NO

>> GO TO 2.

2.

CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT FOR OPEN

1. Turn the ignition switch OFF.

2. Disconnect ECM connector E10.

3. Disconnect power steering control unit connector.

4. Check continuity between ECM connector E10 (A) terminal 94

and power steering control unit connector M59 (B) terminal 10.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connectors.

3.

CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT FOR SHORT

1. Check continuity between ECM connector E10 terminal 94 and

ground.

2. Turn ignition switch ON.

3. Check voltage between ECM connector E10 terminal 94 and

ground.

Is the inspection result normal?

YES

>> GO TO 4.

ECM

Power steering control unit

Continuity

Connector

Terminal

Connector

Terminal

E10 (A)

94

M59 (B)

10

Yes

AWGIA0039ZZ

ECM

Ground

Continuity

Connector

Terminal

E10

94

—

No

AWGIA0095ZZ

ECM

Ground

Voltage (Approx.)

Connector

Terminal

E10

94

—

0V

AWGIA0096ZZ

ENGINE SPEED SIGNAL CIRCUIT

STC-11

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

NO

>> Repair harness or connectors.

4.

CHECK ENGINE SPEED SIGNAL (ECM SIDE)

1. Turn the ignition switch OFF.

2. Connect ECM connector E10.

3. Start the engine.

4. Check signal between ECM connector E10 terminal 94 and

ground with oscilloscope.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace ECM.

5.

CHECK ENGINE SPEED SIGNAL (POWER STEERING CONTROL UNIT SIDE)

1. Turn the ignition switch OFF.

2. Connect power steering control unit harness connector.

3. Start the engine.

4. Check signal between power steering control unit harness con-

nector M59 terminal 10 and ground with oscilloscope.

Is the inspection result normal?

ECM

Value (Approx.)

Connector

Terminal

Condition

E10

94 - Ground

Engine speed: 
At idle
(Warm-up con-
dition)

Engine speed: 
Approx. 2,000 
rpm
(Warm-up con-
dition)

AWGIA0119ZZ

JSGIA0143ZZ

PBIA3655J

Power steering control unit

Value (Approx.)

Connector

Terminal

Condition

M59

 10 - Ground

Engine speed: 
At idle
(Warm-up con-
dition)

Engine speed: 
Approx. 2,000 
rpm
(Warm-up con-
dition)

AWGIA0120ZZ

JSGIA0143ZZ

PBIA3655J

STC-12

< DTC/CIRCUIT DIAGNOSIS >

ENGINE SPEED SIGNAL CIRCUIT

YES

>> GO TO 6.

NO

>> Replace power steering control unit. Refer to 

STC-22, "Removal and Installation"

.

6.

CHECK TERMINALS AND HARNESS CONNECTORS

1. Check power steering control unit pin terminals for damage or loose connection with harness connector.

2. Check ECM pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair or replace damaged parts.

VEHICLE SPEED SIGNAL CIRCUIT

STC-13

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

VEHICLE SPEED SIGNAL CIRCUIT

Description

INFOID:0000000009466559

Combination meter sends vehicle speed signal to power steering control unit.

Diagnosis Procedure

INFOID:0000000009466560

Regarding Wiring Diagram information, refer to 

STC-17, "Wiring Diagram"

.

1.

PERFORM COMBINATION METER SELF-DIAGNOSIS

Perform combination meter self-diagnosis.
Is any error system detected?

YES

>> Check the error system.

NO

>> GO TO 2.

2.

CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT FOR

OPEN

1. Turn the ignition switch OFF.

2. Disconnect combination meter connector.

3. Disconnect power steering control unit connector.

4. Check continuity between combination meter connector M24 (A)

terminal 30 and power steering control unit connector M59 (B)

terminal 8.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connectors.

3.

CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT FOR

SHORT

1. Check continuity between combination meter connector M24

terminal 30 and ground.

Combination meter

Power steering control unit

Continuity

Connector

Terminal

Connector

Terminal

M24 (A)

30

M59 (B)

8

Yes

AWGIA0109ZZ

Combination meter

Ground

Continuity

Connector

Terminal

M24

30

—

No

AWGIA0097ZZ