Isuzu 1999 RODEO Workshop Manual page 1566

Diagnostic Trouble Code (DTC) P0440 EVAP System
Circuit Description
The evaporative system
components:
f Fuel tank
f EVAP canister vent solenoid
f Fuel tank pressure sensor
f Fuel pipes and hoses
f Vapor lines
f Fuel cap
f Evaporative emissions canister
f Purge lines
f EVAP canister 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
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
includes the following
The powertrain control
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:
f Disconnected or faulty fuel tank pressure sensor
f Missing or faulty fuel cap
f Disconnected, damaged, pinched, or blocked EVAP
purge line
f Disconnected or damaged EVAP vent hose
f Disconnected, damaged, pinched, or blocked fuel tank
vapor line
f Disconnected or faulty EVAP canister purge solenoid
f Disconnected or faulty EVAP canister vent solenoid
f Open ignition feed circuit to the EVAP canister vent
solenoid or the EVAP canister purge solenoid
f Damaged EVAP canister
f Leaking fuel sender assembly O-ring
f Leaking fuel tank or fuel filler neck
6E2–323
D06RX019