Infiniti I35 (A33). Manual — part 312
21
CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower.
©
GO TO 22.
22
CHECK REFUELING EVAP VAPOR LINE
Check refueling EVAP vapor line between EVAP canister and fuel tank for clogging, kink, looseness and improper connec-
tion. For location, refer to “EVAPORATIVE EMISSION LINE DRAWING”, EC-41.
OK or NG
OK
©
GO TO 23.
NG
©
Repair or replace hoses and tubes.
23
CHECK SIGNAL LINE AND RECIRCULATION LINE
Check signal line and recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, looseness and
improper connection.
OK or NG
OK
©
GO TO 24.
NG
©
Repair or replace hoses, tubes or filler neck tube.
24
CHECK REFUELING CONTROL VALVE
1. Remove fuel filler cap.
2. Check air continuity between hose ends A and B.
Blow air into hose end B. Air should flow freely into the fuel tank.
3. Blow air into hose end A and check that there is no leakage.
4. Apply pressure to both hose ends A and B [20 kPa (150 mmHg, 5.91 inHg)] using a pressure pump and a suitable
3-way connector. Check that there is no leakage.
SEF830X
OK or NG
OK
©
GO TO 25.
NG
©
Replace or refueling control valve with fuel tank.
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DTC P1456 EVAP CONTROL SYSTEM
Diagnostic Procedure (Cont’d)
EC-589
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
DTC P1456 EVAP CONTROL SYSTEM
Diagnostic Procedure (Cont’d)
EC-590
SEC088D
Component Description
NHEC1111
The fuel level sensor is mounted in the fuel level sensor unit. The
sensor detects a fuel level in the fuel tank and transmits a signal
to the ECM.
It consists of two parts, one is mechanical float and the other side
is variable resistor. Fuel level sensor output voltage changes
depending on the movement of the fuel mechanical float.
On Board Diagnostic Logic
NHEC1112
ECM receives two signals from the fuel level sensor.
One is fuel level sensor power supply circuit, and the other is fuel
level sensor ground circuit.
This diagnosis indicates the latter to detect open circuit malfunc-
tion.
DTC No.
Trouble diagnosis
name
DTC Detecting Condition
Possible Cause
P1464
1464
Fuel level sensor cir-
cuit ground signal
A high voltage from the sensor is sent to ECM.
I
Fuel level sensor circuit
(The fuel level sensor circuit is open
or shorted.)
DTC Confirmation Procedure
NHEC1113
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.
SEF195Y
WITH CONSULT-II
NHEC1113S01
1)
Turn ignition switch ON.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Wait at least 5 seconds.
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-593.
WITH GST
NHEC1113S02
Follow the procedure “WITH CONSULT-II” above.
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DTC P1464 FUEL LEVEL SENSOR
Component Description
EC-591
Wiring Diagram
NHEC1114
MEC642E
SEF711YB
DTC P1464 FUEL LEVEL SENSOR
Wiring Diagram
EC-592
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