Nissan Pathfinder (2005 year). Instruction — part 185
DTC P0442 EVAP CONTROL SYSTEM
EC-331
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EC
2005 Pathfinder
17.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to
EC-354, "Component Inspection"
.
OK or NG
OK
>> GO TO 18.
NG
>> Replace EVAP control system pressure sensor.
18.
CHECK EVAP PURGE LINE
Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection.
Refer to
EC-34, "EVAPORATIVE EMISSION LINE DRAWING"
.
OK or NG
OK
>> GO TO 19.
NG
>> Repair or reconnect the hose.
19.
CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower.
>> GO TO 20.
20.
CHECK EVAP/ORVR LINE
Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper con-
nection. For location, refer to
EC-40, "ON BOARD REFUELING VAPOR RECOVERY (ORVR)"
.
OK or NG
OK
>> GO TO 21.
NG
>> Repair or replace hoses and tubes.
21.
CHECK RECIRCULATION LINE
Check recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, looseness and
improper connection.
OK or NG
OK
>> GO TO 22.
NG
>> Repair or replace hose, tube or filler neck tube.
22.
CHECK REFUELING EVAP VAPOR CUT VALVE
Refer to
.
OK or NG
OK
>> GO TO 23.
NG
>> Replace refueling EVAP vapor cut valve with fuel tank.
23.
CHECK FUEL LEVEL SENSOR
Refer to
DI-23, "FUEL LEVEL SENSOR UNIT"
.
OK or NG
OK
>> GO TO 24.
NG
>> Replace fuel level sensor unit.
24.
CHECK INTERMITTENT INCIDENT
Refer to
EC-158, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
EC-332
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
2005 Pathfinder
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
PFP:14920
Description
UBS00K96
SYSTEM DESCRIPTION
*1:ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM through CAN communication line.
This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass pas-
sage in the EVAP canister purge volume control solenoid valve changes to control the flow rate. The EVAP
canister purge volume control solenoid valve repeats ON/OFF operation according to the signal sent from the
ECM. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is
determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor
from the EVAP canister is regulated as the air flow changes.
COMPONENT DESCRIPTION
The EVAP canister purge volume control solenoid valve uses a ON/
OFF duty to control the flow rate of fuel vapor from the EVAP canis-
ter. The EVAP canister purge volume control solenoid valve is
moved by ON/OFF pulses from the ECM. The longer the ON pulse,
the greater the amount of fuel vapor that will flow through the valve.
CONSULT-II Reference Value in Data Monitor Mode
UBS00K97
Specification data are reference values.
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
1
EVAP canister
purge flow control
EVAP canister purge vol-
ume control solenoid valve
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Battery
Battery voltage*
1
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
Air fuel ratio (A/F) sensor 1
Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Fuel tank temperature sensor
Fuel temperature in fuel tank
Wheel sensor*
2
Vehicle speed
PBIB2057E
MONITOR ITEM
CONDITION
SPECIFICATION
PURG VOL C/V
●
Engine: After warming up
●
Shift lever: P or N
●
Air conditioner switch: OFF
●
No-load
Idle
(Accelerator pedal is not depressed
even slightly, after engine starting)
0%
2,000 rpm
—
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
EC-333
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EC
2005 Pathfinder
On Board Diagnosis Logic
UBS00K98
DTC Confirmation Procedure
UBS00K99
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm battery voltage is more than 11V at idle.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and let it idle for at least 13 seconds.
4.
If 1st trip DTC is detected, go to
EC-336, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0444
0444
EVAP canister purge volume
control solenoid valve circuit
open
An excessively low voltage signal is sent
to ECM through the valve
●
Harness or connectors
(The solenoid valve circuit is open or
shorted.)
●
EVAP canister purge volume control
solenoid valve
P0445
0445
EVAP canister purge volume
control solenoid valve circuit
shorted
An excessively high voltage signal is sent
to ECM through the valve
●
Harness or connectors
(The solenoid valve circuit is shorted.)
●
EVAP canister purge volume control
solenoid valve
SEF058Y
EC-334
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
2005 Pathfinder
Wiring Diagram
UBS00K9A
BBWA1751E
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
EC-335
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EC
2005 Pathfinder
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.)
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
45
R
EVAP canister purge vol-
ume control solenoid valve
[Engine is running]
●
Idle speed
●
Accelerator pedal is not depressed even
slightly, after engine starting
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●
Engine speed: About 2,000 rpm (More than
100 seconds after starting engine)
BATTERY VOLTAGE
(11 - 14V)
111
BR
ECM relay
(Self shut-off)
[Engine is running]
[Ignition switch: OFF]
●
For a few seconds after turning ignition
switch OFF
0 - 1.5V
[Ignition switch: OFF]
●
More than a few seconds after turning igni-
tion switch OFF
BATTERY VOLTAGE
(11 - 14V)
119
120
R
P
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
SEC990C
SEC991C
EC-336
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
2005 Pathfinder
Diagnostic Procedure
UBS00K9B
1.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE POWER SUPPLY CIR-
CUIT
1.
Turn ignition switch OFF.
2.
Disconnect EVAP canister purge volume control solenoid valve
harness connector.
3.
Turn ignition switch ON.
4.
Check voltage between EVAP canister purge volume control
solenoid valve terminal 2 and ground with CONSULT-II or tester.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E2, F32
●
Harness for open or short between EVAP canister purge volume control solenoid valve and IPDM E/R
●
Harness for open or short between EVAP canister purge volume control solenoid valve and ECM
>> Repair harness or connectors.
3.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OUTPUT SIGNAL CIR-
CUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between ECM terminal 45 and EVAP canister purge volume control solenoid
valve terminal 1. Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK (With CONSULT-II)>>GO TO 4.
OK (Without CONSULT-II)>>GO TO 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
BBIA0550E
Voltage: Battery voltage
PBIB2605E
Continuity should exist.
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
EC-337
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EC
2005 Pathfinder
4.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
With CONSULT-II
1.
Reconnect all harness connectors disconnected.
2.
Start engine.
3.
Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with
CONSULT-II. Check that engine speed varies according to the
valve opening.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to
EC-337, "Component Inspection"
.
OK or NG
OK
>> GO TO 6.
NG
>> Replace EVAP canister purge volume control solenoid valve.
6.
CHECK INTERMITTENT INCIDENT
Refer to
EC-158, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Component Inspection
UBS00K9C
EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
With CONSULT-II
Check air passage continuity of EVAP canister purge volume control
solenoid valve under the following conditions.
Without CONSULT-II
Check air passage continuity of EVAP canister purge volume control
solenoid valve under the following conditions.
PBIB1678E
Condition
(PURG VOL CONT/V value)
Air passage continuity
between A and B
100%
Yes
0%
No
PBIB2058E
Condition
Air passage continuity
between A and B
12V direct current supply between
terminals 1 and 2
Yes
No supply
No
PBIB2059E
EC-338
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
2005 Pathfinder
Removal and Installation
UBS00K9D
EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Refer to
EM-16, "INTAKE MANIFOLD COLLECTOR"
.
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