Question about Cars & Trucks
Just replaced the catalytic converter and PASSED SMOG! But the check engine light stays on. Bug washer bottle has a leak and is empty now. No problems with driving (had it on the road for 250 freeway miles after CC was replaced and smog passed). How do I reset CEL to see if it still shows a problem?
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Posted on Jan 02, 2017
Your P0446 code is a Evap vent valve code: Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.
Symptoms There will be no obvious symptoms to driver, other than MIL illumination.
Causes A code P0446 could mean one or more of the following has happened:
Posted on Nov 20, 2009
Have a code test done (most larger parts stores do that free) In some cases you may need a shop to put a scanner on it to find specific out of range sensors that may not yet be bad enough to set a code.
I'd also check all vacuum lines and line connections as a small leak can alter the system readings. All the sensors on your car work together and the computer reacts to all the information it receives... Bad info in, bad info out...Only good testing will find the problem.
Primary sensors to pay attention to are the coolant temp sender, MAP sensor, throttle position sensor, manifold air temp sender, mass air flow sensor (if you have one) and the egr valve.and pcv valve (if you have them)
Good testing involves using a digital multi-meter and using instructions for that in chilton or haynes manuals. Replacing parts without testing can get really expensive. (but you have already found that out)
Posted on May 24, 2010
SOURCE: honda passport 1994 4wh drive
Here are a few things to look at:
Have you replaced the air filter? Have a compression test done on the engine, could possibly be a leaking vale. If any vacuum hoses have been removed from the engine they will have to be re-installed. Solid Lifters out of adjustment can cause incomplete combustion. Make sure engine is reaching proper operating temperature (eg. thermostat). Do not use low grade (octane) fuel for test.
Clean oil, tire pressure, brake drag?, every little thing counts.
Posted on Oct 12, 2010
SOURCE: driving code to reset OBD
Hi, remove the positive terminal cable from the battery using your pliers or wrench.
Go to your fuse box in your car, and look at the diagram. Select the fuse that is labeled "ECM" and remove this fuse. Sit the fuse aside for now.
Keep the car disconnected like this for two to three minutes to clear the computer's memory.
Insert the fuse back in to the box. Reconnect the battery terminal. Your car should now be reset.
Posted on Apr 09, 2011
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