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
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
Continuity should exist.
Resistance: Approximately 8
Ω
[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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