I've Honda Civic LX 1997, 120,000 Mi. My CEL came on right before I
need to do a smog check. The error code is 5, MAP Sensor (Manifold
Absolute Pressure) mechanical problem. How do I test the sensor (or any
web-link)? I want to make sure it is the problem on the MAP sensor
before I replace it with a new one.

There is 3 wires go into the sensor Yellow, Green, and Red. Look like
the the Red and Green come from the sensor below the air filter. Can I
check the voltage on the Yellow and see if it vary when I rev the
engine? What would be the voltage range and where do I put the voltage
ground? Also any link to sensor specification would really be
appriciated.

Is it possible that the problem is not on the MAP Sensor? If so what
can cause the error code 5?

Thanks in Advance
Don