P0440 Evap System - Isuzu 2000 Trooper Workshop Manual

Diagnostic Trouble Code (DTC) P0440 EVAP System
Circuit Description
The evaporative system
components:
D Fuel tank
D EVAP canister duty solenoid valve
D Fuel tank pressure sensor
D Fuel pipes and hoses
D Vapor lines
D Fuel cap
D Evaporative emissions canister
D Purge lines
D EVAP canister cut valve (purge solenoid)
The evaporative leak detection diagnostic strategy is
based on applying vacuum to the EVAP system and
monitoring vacuum decay.
module (PCM) monitors vacuum level via the fuel tank
pressure sensor input. At an appropriate time, the EVAP
canister purge solenoid and the EVAP canister vent
solenoid are turned "ON," allowing engine vacuum to
draw a small vacuum on the entire evaporative emissions
system. If a sufficient vacuum level cannot be achieved, a
large leak or a faulty EVAP canister purge solenoid is
indicated. This can be caused by the following conditions:
D Disconnected or faulty fuel tank pressure sensor
D Missing or faulty fuel cap
D Disconnected, damaged, pinched, or blocked EVAP
purge line
D Disconnected or damaged EVAP vent hose
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
includes the following
The powertrain control
D Disconnected, damaged, pinched, or blocked fuel tank
vapor line
D Disconnected or faulty EVAP canister cut valve
D Disconnected or faulty EVAP canister duty solenoid
valve
D Open ignition feed circuit to the EVAP canister vent
solenoid or the EVAP canister cut valve
D Damaged EVAP canister
D Leaking fuel sender assembly O-ring
D Leaking fuel tank or fuel filler neck
Any of the above conditions can set DTC P0440.
Conditions for Setting the DTC
D No TP sensor, IAT sensor, or MAP sensor DTCs set.
D Start-up engine coolant temperature is less than 32°C
(90°F).
D Start-up engine coolant temperature is not more than
7°C (13°F) greater
temperature.
D Start-up intake air temperature is greater than 4°C
(39°F) .
D Start-up intake air temperature is not more than 2°C
(4°F) greater than
temperature.
D Vehicle speed is less than 5 mph (8 km/h).
D Throttle position is greater than 3%.
D Minimal fuel slosh.
D BARO is greater than 70 kPa.
6E–329
D06RY00128
than start-up intake
start-up engine coolant
air