2002 NISSAN MAXIMA User Manual

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On Board Diagnosis Logic

NFEC0960

NOTE:

If DTC P0442 is displayed with P1448, perform trouble diagno-

sis for DTC P1448 first. (See EC-594.)

This diagnosis detects leaks in the EVAP purge line using engine

intake manifold vacuum.

If pressure does not increase, the ECM will check for leaks in the

line between the fuel tank and EVAP canister purge volume con-

trol solenoid valve, under the following “Vacuum test” conditions.

The vacuum cut valve bypass valve is opened to clear the line

between the fuel tank and the EVAP canister purge volume control

solenoid valve. The EVAP canister vent control valve will then be

closed to shut the EVAP purge line off. The EVAP canister purge

volume control solenoid valve is opened to depressurize the EVAP

purge line using intake manifold vacuum. After this occurs, the

EVAP canister purge volume control solenoid valve will be closed.

SEC936C

DTC No.

Trouble diagnosis

name

DTC Detecting Condition Possible Cause

P0442

0442

EVAP control system

small leak detected

(negative pressure)

EVAP control system has a leak, EVAP control

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 is saturated with water.

I EVAP control system pressure sensor

I Fuel level sensor and the circuit

I Refueling control valve

I ORVR system leaks

IDX

DTC P0442 EVAP CONTROL SYSTEM

On Board Diagnosis Logic

EC-361

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User Manual - Page 361