Hi, i just moved to virginia and their emissions test includes a diagnostic check - the tester said the diagnostic wasn't communicating and all my fuses are good - what could be the problem? btw, i think i changed out the factory stereo since my last emissions test in Massachusetts . . . would that have anything to do with it??
Hi, this got fixed . . . all my fuses i checked WERE good . . BUT, i had taken out my dome light fuse to replace another similar fuse that had blown . . . the mechanic at Honda let me know that the diagnostic system runs through the domelight fuse for some reason - once that fuse was replaced, it was good to go!
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95 Accord is pre-obd 2 and will probably need dedicated Honda diagnostic equipment. There was no requirement at that time to use a standard connector or to place the connector within reach of the driver's seat as with obd 2.
Honda service information should provide more details or for simplicity ask your local Honda dealer to check the emission?
The simplest method would be to check the emissions the old-fashioned way - like it is still done in lots of places, by testing the emissions at the tailpipe with a suitable gasalyser...
The Code P0450 indicates that the Evaporative Pressure
Sensor output value is not changing during the EVAP Monitor test and/or
the operation of the vehicle. This code uses "two trip" logic, which
means that the fault condition must be present during two successive
cold starts and vehicle operation. The sensor is mounted in the top of the gas tank near the sending unit. You would need to test the pressure sensor.
You don't say what state you are in and what the requirements. The early 90s Honda Civics frequently are high on emissions under certain circumstances depending on how the test is run. If you are in a state that allows you to get a waiver with a certain amount of repair - that would be the recommended way to go. A lot of times the amount required is enough to detect the problem, but if not it is basically the cost of keeping the car. I am in Washington State and my 91 Honda Civic runs great and gets 38 mpg but fails the test. I have a new O2 sensor, catalytic converter and distributor and fail. I pay $150 for repairs / waiver every 2 years - and I am an ASE Certified Master Tech. I figure $75 a year saves me a car payment.
The emissions test may vary from one state to the next. For example in NY the 1990 model would not have to have an emissions test, which for newer vehicles is part of the Inspection.
The safety inspection includes:
front and rear brakes
parking brake for a manual tranny All lights on vehicle, turn signals, brake lights
Horn needs to work
Wipers need to work
Tires need to have adequate tread
Any cracks in glass (windshield) need to be within safety limits
on older vehicles, mechanic may also look at steering linkage, brake lines for severe corrosion.
And basically any malfunction or damage to the vehicle that would place it in an unsafe condition. That could anything from a bumper that's ready to fall off to a gas leak at the gas tank.
Yes the problem is effecting the emissions controls. Sounds like the timing if off. Take the vehicle to you local Auto Parts Store and most will scan the ECU for fault codes. This code will help you to figure out the problem.