this is on the whole time. i am getting code 48 MAF code i think. i have a 94 and i cant reset the SES light with datamaster i am stumped??? my car sometimes wont start unless i hold down the gas pedal and then it will start and black smoke is all over the place. my injectors are not leaking either and i do not have any vacume leaks. any ideas would be great guys.
thanks
nick

 

Your MAF sensor is unplugged or broke so you need to fix it if you ever want the SES light to go away.

 

its plugged in. how do i know if it is broke?

 

48 is a maf code. The reason you have to hold it to the floor to get it to start is quite possably because with the 48 set the computer is acting like its flooded when you hold it to the floor it clears the floos stage. Also as far as the fans being on thats normal when the ses light is on the fans come on and stay on till the light goes out most of the time you can unhook your battery to get rid of the light but untill you get the bottom of the 48 it will keep coming back on. What is your airflow readings like at adle you should be getting 8 grahms/ per sec. Also look at your air intake tubes inbetween the maf and the throttle body make sure there are no rips or tears or loose hose clamps that will give fals reading to your pc causing the code good luck

 

First get a test light or voltmeter and see if any juice is making it to the sensor. If there is good voltage and a good ground at the plug to the MAF then the sensor needs replaced.

 

my AFGS is at 471.38. i checked the volts at the plug and i get the 12v to b and c,but on the a to b i get nothin. i am thinking ECU or wire harness prob. what do you guys think

 

If the PCM scan is showing 471gps, the MAF is not producing any signal at all. Its just like it was unplugged. You indicate +12V between the pink wire (C) and the black wire (B), correct? With everything connected, you should see 4 to 5V on the yellow wire. The MAF signal itself is a variable frequency that "rides" on the 5V carrier. If you don't have any voltage at pin B19 on the PCM, you need to find out why.

Have you tried swapping in a known "good" MAF sensor?