P0441 EVAP Purge Flow Monitor Failure
NAME OF CODEEVAP Purge Flow Monitor Failure
WHEN MONITORED
With engine temperature greater than 170°F. engine in doted loop, engine idling for 2 minutes, to PTO in use, to low fuel, vacuum greater than 9.7 inches mercury, and barometric altitude less than 8,000 feet.
SET CONDITION
Note:
with LDP: must pass strictor evap system test first. No air flow through the evaporative system it detected by the evap monitor.
THEORY OF OPERATION
The purpose of the evaporative system is to recycle the accumulated fuel vapor bound in the fuel tank. The fuel vapor is temporarily held in the evap canister and in recirculated nit the evap solenoid through the air intake system and consumed during combustion. The evaporative system consists of the fuel tank. vapor flow control orifice, evap solenoid, and evap canister connected by a tenet of rubber hoses and plastic connectors.
POSSIBLE CAUSES
- Rubber hose(s) pierced, cut, cracked, kinked or off (solenoid to throttle body)
- Plastic connector to evap solenoid cracked
- Evap solenoid malfunction
- Hose plugged from solenoid to canister
- Hose plugged from throttle body to solenoid
- Connector terminals
- Connector wires
NAME OF CODE
EVAP Purge Low Monitor Failure With LDP
WHEN MONITORED
SEE DRB III
SET CONDITION
SEE DRB III
THEORY OF OPERATION
The first portion of the test determines whether or not a line is pinched in the system. If the pump rate falls to zero too rapidly, the PCM determines that there is not enough space to pressurize, this indicates a possible pinched line. If there is a leak present in the EVAP system, the cycle rate falls to a rate proportional to the size of the leak. By monitoring the cycle rate of the pump, the PCM is able to calculate the size of the leak.
POSSIBLE CAUSES
- Rubber hose(s) pierced, cut, cracked, kinked or off (solenoid to throttle body)
- Plastic connector to evap solenoid cracked
- Evap solenoid malfunction
- Hose plugged from solenoid to canister
- Hose plugged from throttle body to solenoid
- Connector terminals
- Connector wires
- Foreign material
- Rollover valve malfunction