Question about 1999 Oldsmobile 88

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'99 olds 88 diagnosed PO 446 evap vent control problem

Went in for emission check on '99 olds 88. Engine light was on so had to run diagnostics. Came up with PO 446 evap vent control problem. Was told had to take it to a dealer. Any other ideas or if I could fix? Any suggestions would be appreciated.
Thanks Dennis

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Your code means:

P0446 '99 olds 88 diagnosed PO 446 evap vent control pro - onepx.gif EVAP Canister Purge Vent Blocked

Some of the possible causes:

EVAP vent fresh air hose is clogged, kinked or restricted
EVAP Vent solenoid is contaminated, damaged or has failed
FTP sensor is out-of-calibration, damaged or "skewed"
PCM has failed

All tough thing for a lay person to check. You don't have to take it to the dealer, any repair garage that has the proper equipment can fix this for you.

Posted on Feb 09, 2009

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Hello I have 1997 toyota Camry with code 450 and pending code 446 I took the gas cap off this morning with the car running and screwed it back on tight and that's where I got the pending code I hear it...


These codes usually trigger the check engine light to ON if the car is fueled or fuel tank cap is removed with the engine in start position.
To delete the codes, remove the key from ignition, remove the battery negative terminal for 5 Seconds or more. Reconnect the battery terminal, start the engine, let it idle for 10 minutes.
Error Code: P 0446
Description:
Evaporative Emission (EVAP) System, Vent Control - Circuit Malfunction
Possible Cause:
Wiring.
Evaporative emission (EVAP) canister purge valve.
Engine control module (ECM).

Error Code: P 0450
Description:
Evaporative Emission (EVAP) Pressure Sensor - Circuit Malfunction
Possible Cause:
Wiring.
Evaporative emission (EVAP) pressure sensor.
Engine control module (ECM).

Hope that will work. If the problem persists contact a service technician.

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PO 446 --Evap Vent Control Circuit Malfunction

You need to work from factory diagnostic charts
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Toyota echo won't start code 440 441 446


Error Code: P0440
Fault Location:
Evaporative Emission (EVAP) System - Malfunction
Possible Cause:
Malfunction Indicator Lamp (MIL) active.
Soution:
Check Evaporative Emission (EVAP) System Sealing.
Check Evaporative Emission (EVAP) Canister Purge Regulator Valve .
Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve .

Error Code: P0441
Fault Location:
Evaporative Emission (EVAP) System - Incorrect Flow Detected
Possible Solutions:
Check Evaporative Emission (EVAP) Canister Purge Regulator Valve .
Perform Output Test.
Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve .
Check Evaporative Emission (EVAP) Canister.
Perform Basic Setting.
Check Pipes between Tank Breathing and Throttle Body.

Error Code: P0446
Fault Location:
Evaporative Emission (EVAP) System, Vent Control - Circuit Malfunction
Possible Cause:
Wiring harness.
Evaporative emission (EVAP) canister purge valve.
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Hi there:
This indicates that a part of the EVAP control system is no longer functioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.



I suggest replacing the gas cap with preferably one from the Nissan dealer, or OEM equivalent, then clear these codes by disconnecting the negative battery cable for about a minute then drive it normally; if the codes come back, this may take a couple of days, you most likely have to have the system tested for leaks.


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.


Thank you for using FixYa, have a nice day.

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