Infiniti M45 (Y34). Manual - part 473

 

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Infiniti M45 (Y34). Manual - part 473

 

 

DTC P1480 COOLING FAN SPEED CONTROL SOLENOID VALVE

EC-581

C

D

E

F

G

H

I

J

K

L

M

A

EC

Wiring Diagram

ABS002RC

TBWM0048E

EC-582

DTC P1480 COOLING FAN SPEED CONTROL SOLENOID VALVE

Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnostic Procedure

ABS002RD

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws. 
Refer to 

EC-141, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2. 

CHECK COOLING FAN SPEED CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

1.

Disconnect cooling fan speed control solenoid valve harness
connector.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal 47 and cooling
fan speed control solenoid valve terminal 1.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 3.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

28

L

Cooling fan speed control 
solenoid valve ground

[Engine is running]

Approximately 0V

47

R

Cooling fan speed control 
solenoid valve

[Engine is running]

Idle speed

6.5 - 8V

PBIB0049E

PBIB1118E

Continuity should exist.

PBIB0023E

DTC P1480 COOLING FAN SPEED CONTROL SOLENOID VALVE

EC-583

C

D

E

F

G

H

I

J

K

L

M

A

EC

3. 

CHECK COOLING FAN SPEED CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN 

AND SHORT

1.

Check harness continuity between ECM terminal 28 and cooling fan speed control solenoid valve terminal
2.
Refer to Wiring Diagram.

2.

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

OK or NG

OK

>> GO TO 4.

NG

>> Repair open circuit or short to ground and short to power in harness or connectors.

4. 

CHECK COOLING FAN SPEED CONTROL SOLENOID VALVE

Refer to 

EC-583, "Component Inspection"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Replace cooling fan speed control solenoid valve.

5. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

ABS002RE

COOLING FAN SPEED CONTROL SOLENOID VALVE

Check resistance between cooling fan speed control solenoid valve
terminals 1 and 2.

Removal and Installation

ABS002RF

COOLING FAN SPEED CONTROL SOLENOID VALVE

Cooling fan speed control solenoid valve is built-into the cooling fan pump which is assembled to water pump.
Refer to 

CO-22, "WATER PUMP"

 .

Continuity should exist.

Resistance: Approximately 8

 [at 20

°

C (68

°

F)]

PBIB0131E

EC-584

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

PFP:17372

Description

ABS002RG

COMPONENT DESCRIPTION

The vacuum cut valve and vacuum cut valve bypass valve are installed in parallel on the EVAP purge line
between the fuel tank and the EVAP canister.
The vacuum cut valve prevents the intake manifold vacuum from being applied to the fuel tank.
The vacuum cut valve bypass valve is a solenoid type valve and generally remains closed. It opens only for on
board diagnosis.
The vacuum cut valve bypass valve responds to signals from the ECM. When the ECM sends an ON (ground)
signal, the valve is opened. The vacuum cut valve is then bypassed to apply intake manifold vacuum to the
fuel tank.

EVAPORATIVE EMISSION SYSTEM DIAGRAM

CONSULT-II Reference Value in Data Monitor Mode

ABS002RH

Specification data are reference values.

On Board Diagnosis Logic

ABS002RI

PBIB0026E

SEF323U

MONITOR ITEM

CONDITION

SPECIFICATION

VC/V BYPAS S/V

Ignition switch: ON

OFF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1490
1490

Vacuum cut valve bypass 
valve circuit

An improper voltage signal is sent to ECM 
through vacuum cut valve bypass valve.

Harness or connectors
(The valve circuit is open or shorted.)

Vacuum cut valve bypass valve

 

 

 

 

 

 

 

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