Infiniti QX56 (Z62). Manual - part 598

 

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Infiniti QX56 (Z62). Manual - part 598

 

 

EC-370

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0527 COOLING FAN SPEED SENSOR

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace Electrically-controlled cooling fan coupling.

+

Condition

Voltage (V)

(Approx.)

Electrically-controlled 

cooling fan coupling

Terminal

5

4

• 5V direct current supply to terminal 2
• Terminal 4 connect to ground

 5

NOTE:
The voltage is in waveform 

P0550 PSP SENSOR

EC-371

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0550 PSP SENSOR

DTC Logic

INFOID:0000000006217870

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and let it idle for at least 5 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-371, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006217871

1.

CHECK POWER STEERING PRESSURE SENSOR POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF.

2.

Disconnect power steering pressure (PSP) sensor harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between PSP sensor harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 2.

2.

CHECK POWER STEERING PRESSURE SENSOR POWER SUPPLY CIRCUIT-II

1.

Check the voltage between PSP sensor harness connector and the ground.

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0550

PW ST P SEN/CIRC
(Power steering pressure 
sensor circuit)

An excessively low or high voltage from the 
sensor is sent to ECM.

• Harness or connectors

(The Fuel rail pressure sensor circuit is 
open or shorted.)
(The Power steering pressure sensor cir-
cuit is open or shorted)
(The Electrically-controlled cooling fan 
coupling circuit is open or shorted)

• Fuel rail pressure sensor
• Power steering pressure sensor
• Electrically-controlled cooling fan cou-

pling

PSP sensor

Voltage

(Approx.)

Connector

+

terminal

F35

1

3

5 V

EC-372

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0550 PSP SENSOR

Is inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK SENSOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness connector for short to power and short to ground, between the following terminals.

Is inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit. Refer to 

EC-168, "Diagnosis Procedure"

.

NO

>> Repair or replace error-detected parts.

4.

CHECK PSP SENSOR GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between PSP sensor harness connector and ECM harness connector.

4.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

CHECK ECM GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between ECM harness connector and the ground.

Is inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

+

Voltage

(Approx.)

PSP sensor

Connector

terminal

F35

1

Ground

5 V

ECM

Sensor

Connector

Terminal

Name

Connector

Terminal

F111

27

Low fuel pressure sensor

F25

3

Power steering pressure sensor

F35

1

Cooling fan speed sensor

F39

2

28

FRP sensor

F26

1

+

Continuity

PSP sensor

ECM

Connector

Terminal

Connector

Terminal

F35

3

F111

45

Existed

+

Continuity

ECM

Connector

Terminal

F111

10

Ground

Existed

E80

174

175

P0550 PSP SENSOR

EC-373

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

NO

>> Repair or replace error-detected parts.

6.

CHECK PSP SENSOR SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between PSP sensor harness connector and ECM harness connector.

4.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace error-detected parts.

7.

CHECK PSP SENSOR

Refer to 

EC-373, "Component Inspection (Power Steering Pressure Sensor)"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace PSP sensor.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (Power Steering Pressure Sensor)

INFOID:0000000006217872

1.

CHECK POWER STEERING PRESSURE SENSOR

1.

Turn ignition switch OFF.

2.

Reconnect all harness connectors disconnected.

3.

Start engine and let it idle.

4.

Check the voltage between ECM harness connector terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace power steering pressure sensor.

+

Continuity

PSP sensor

ECM

Connector

Terminal

Connector

Terminal

F35

2

F111

39

Existed

ECM

Condition

Voltage (V)

Connector

+

Terminal

Terminal

F111

39

45

Steering wheel

Being turned

0.5 - 4.5

Not being turned

0.4 - 0.8

 

 

 

 

 

 

 

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