2000 Miata OBDII "What we have here is a failure to communicate"
My car passes the CA required emission test, yet fails to "handshake" with diagnostic computer and several code readers, including mine. PIN 16 is hot with 12VDC. The Check Engine light was not on at first, but now it is on. This has been going on for over a year. I have checked all fuses on the panel under the hood, and next to the ODB II plug. They have always been fine. Now what? The car wouldn't pass emission testing if the computer wasn't working, right?
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MIL is your malfunction indicator lamp, (check engine light)
CMD is the computer interface port, or OBDII port indicating a malfunction communicating with your cars computer
check all the fuses, primarily any marked pcm and retest your vehicle
note: your check engine or MIL has to be on in KOEO state (key on engine off), if the bulb is burned out everything will still work and the OBDII test computer will show MIL status ON, and if you don't have a computer to tell you that, you must get that light to light in the koeo state.
The person running the test is an idiot. The OBDII test instrument is not capable of determining if there is a warning lamp failure. It is probably guessing based on voltage level, but lamp resistance does normally vary. The test is supposed to be done visually. Take it to someone else, and they will probably be more competent and pass your car.
First the fault codes, U110C is No Fuel Level Bus Message U0155 is No Cluster Bus Message. Unfortunatly you have to be able to communicate with the instrument cluster with your scanner to diagnoise and I do not think an aftermarket scanner can do this.
Some vehicles require very specific drive cycles (called "drive traces"
if you perform them on a road simulator or dyno) to activate certain
self-checks like the catalyst and EVAP monitors.
As a general rule, doing some stop-and-go driving around town at speeds
up to about 30 mph followed by five to seven minutes of steady 55 mph
highway speed driving will usually set most or all of the monitors.
Consequently, if you're checking an OBD II system and discover that one
or more of the monitors have not run, it may be necessary to test drive
the vehicle to set the remaining monitors.
You should talk to a good emission tec, if this is not throwing a code, it is hard to say if that one of the components could be bad. O2,pump,convert, HeO2, every part of the emission system.
With a 1000 miles, and doing what is says above just before the test, and ending driving at the test should be plenty. If it is not, you will have to have each emission part checked, or when the computer is plugged in it might show a code that did not trip dash light.
have you had the the engine codes pulled and reset?
and if so what are your engine codes?
i dont know of any car that will pass emissions test with the engine light on.
we cure your trouble that caused your engine light to come on and you will pass your test.
If it was originally intended for Texas, it's probably been made as a 49-state-compliant vehicle (CA has stricter emissions). To pass in CA, you may need some new parts for the truck in order to get it to pass. Or you may find that the best course of action is to sell the truck and buy a CA-emissions car.
The CA DMV may well have information available on how to get non-CA-compliant cars to pass the CA emissions testing.
HI.. I read your comment,
But on my Computer nothing is there with that code.
ON midle of 1995, OBDII, cars, The format for all the codes are
with One latter, P,C,B,U, and 4 digits.
I'm sorry P047, not correspond to your car.