Nissan Frontier D22. Manual - part 349

DTC P1464 FUEL LEVEL SENSOR

EC-499

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Wiring Diagram

UBS00DBY

BBWA1066E

EC-500

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DTC P1464 FUEL LEVEL SENSOR

Diagnostic Procedure

UBS00DBZ

1. 

CHECK FUEL LEVEL SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal 66 and body ground.
Refer to Wiring Diagram.

4.

Also check harness for short to power.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors F36, M81

●

Harness for open and short between ECM and body ground

>> Replace open circuit or short to power in harness or connectors.

3. 

CHECK FUEL LEVEL SENSOR

Refer to 

DI-18, "FUEL LEVEL SENSOR UNIT CHECK"

 .

OK or NG

OK

>> GO TO 4.

NG

>>  Replace fuel level sensor unit.

4. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

OK or NG

>> INSPECTION END.

Removal and Installation

UBS00DC0

FUEL LEVEL SENSOR UNIT

Refer to 

FL-6, "FUEL LEVEL SENSOR UNIT AND FUEL PUMP ASSEMBLY"

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Continuity should exist.

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

EC-501

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DTC P1490 VACUUM CUT VALVE BYPASS VALVE

PFP:17372

Description

UBS00DC1

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

UBS00DC2

Specification data are reference values.

On Board Diagnosis Logic

UBS00DC3

SEF186S

PBIB1402E

MONITOR ITEM

CONDITION

SPECIFICATION

VC/V BYPASS/V

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Ignition switch: ON

OFF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1490

Vacuum cut valve 
bypass valve circuit

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

●

Harness or connectors
(The vacuum cut valve bypass valve cir-
cuit is open or shorted)

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Vacuum cut valve bypass valve

EC-502

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DTC P1490 VACUUM CUT VALVE BYPASS VALVE

DTC Confirmation Procedure

UBS00DC4

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and wait at
least 5 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 wait at least 5 seconds.

4.

If 1st trip DTC is detected, go to 

EC-504, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II”.

SEF058Y