Infiniti I35 (A33). Manual — part 255
25
CHECK FUEL LEVEL SENSOR
Refer to EL-140, “Fuel Level Sensor Unit Check”.
OK or NG
OK
©
GO TO 26.
NG
©
Replace fuel level sensor unit.
26
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-152.
©
INSPECTION END
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AX
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IDX
DTC P0442 EVAP CONTROL SYSTEM
Diagnostic Procedure (Cont’d)
EC-361
Description
NHEC0963
SYSTEM DESCRIPTION
NHEC0963S01
Sensor
Input Signal to ECM
ECM
function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
EVAP can-
ister purge
flow control
EVAP canister purge volume
control solenoid valve
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Ignition switch
Start signal
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
Heated oxygen sensor 1
Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Fuel tank temperature sensor
Fuel temperature in fuel tank
Vehicle speed sensor
Vehicle speed
This system controls flow rate of fuel vapor from the EVAP canis-
ter. The opening of the vapor by-pass passage in the EVAP canis-
ter 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 consider-
ing 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.
SEF337U
COMPONENT DESCRIPTION
NHEC0963S02
The EVAP canister purge volume control solenoid valve uses a
ON/OFF duty to control the flow rate of fuel vapor from the EVAP
canister. 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
NHEC0964
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
PURG VOL C/V
I
Engine: After warming up
I
Air conditioner switch OFF
I
Shift lever: N
I
No-load
Idle (Vehicle stopped)
0%
2,000 rpm
—
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
Description
EC-362
On Board Diagnosis Logic
NHEC0966
DTC No.
Trouble diagnosis
name
DTC Detecting Condition
Possible Cause
P0444
0444
EVAP canister purge
volume control sole-
noid valve circuit
open
An excessively low voltage signal is sent to ECM
through the valve.
I
Harness or connectors
(The solenoid valve circuit is open or
shorted.)
I
EVAP canister purge volume control
solenoid valve
P0445
0445
EVAP canister purge
volume control sole-
noid valve circuit
shorted
An excessively high voltage signal is sent to ECM
through the valve.
I
Harness or connectors
(The solenoid valve circuit is shorted.)
I
EVAP canister purge volume control
solenoid valve
SEF058Y
DTC Confirmation Procedure
NHEC0967
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
NHEC0967S01
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 “Diagnostic Procedure”,
EC-366.
WITH GST
NHEC0967S02
Follow the proocedure “WITH CONSULT-II” above.
GI
MA
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LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
On Board Diagnosis Logic
EC-363
Wiring Diagram
NHEC0968
MEC552D
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
Wiring Diagram
EC-364
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