2002 NISSAN MAXIMA User Manual

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On Board Diagnosis Logic

NFEC0987

SEC936C

This diagnosis detects very small leaks in the EVAP line between fuel tank and EVAP canister purge volume

control solenoid valve, using the intake manifold same as a conventional EVAP small leak diagnosis.

If ECM judges a leak which corresponds to a very small leak, the very small leak P0456 will be detected.

If ECM judges a leak equivalent to a small leak, EVAP small leak P0442 will be detected.

If ECM judges there are no leaks, the diagnosis will be OK.

DTC No.

Trouble diagnosis

name

DTC Detecting Condition Possible Cause

P0456

0456

Evaporative emission

control system very

small leak (negative

pressure check)

I EVAP system has a very small leak.

I EVAP system does not operate properly.

I Incorrect fuel tank vacuum relief valve

I Incorrect fuel filler cap used

I Fuel filler cap remains open or fails to

close.

I Foreign matter caught in fuel filler cap

I Leak is in line between intake mani-

fold and EVAP canister purge volume

control solenoid valve.

I Foreign matter caught in EVAP canis-

ter vent control valve

I EVAP canister or fuel tank leaks

I EVAP purge line (Pipe and rubber

tube) leaks

I EVAP purge line rubber tube bent

I Blocked or bent rubber tube to EVAP

control system pressure sensor

I Loose or disconnected rubber tube

I EVAP canister vent control valve and

the circuit

I EVAP canister purge volume control

solenoid valve and the circuit

I Absolute pressure sensor

I Fuel tank temperature sensor

I O-ring of EVAP canister vent control

valve is missing or damaged.

I Water separator

I EVAP canister saturated with water

I EVAP control system pressure sensor

I Refueling control valve

I ORVR system leaks

I Fuel level sensor and the circuit

I Foreign matter caught in EVAP canis-

ter purge volume control solenoid

valve

CAUTION:

I Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used,

the MIL may come on.

I If the fuel filler cap is not tightened properly, the MIL may come on.

I Use only a genuine NISSAN rubber tube as a replacement.

IDX

DTC P0456 EVAP CONTROL SYSTEM

On Board Diagnosis Logic

EC-417

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User Manual - Page 417