so ive been having alot of trouble wit my car lately... i have a check engine light on and car runs like crap :( code is PO108 which is high input map sensor. they say check the harness connectors replace map sensor and bad VC1 which i have no clue wut it is.. besides VC1 i did everything and no lucky :(

plz help

You got this code because the MAP sensor output was higher than 4.7V for more than 2 seconds. If you have any auxiliary electronics tapped into your MAP sensor output, now would be the time to remove it (Apex S-AFC, Split Second VC1, etc). If you don't know what a VC1 is, it is an electronic device intended to limit the maximum voltage output from your MAP sensor, when a turbo or supercharger is added to the engine. It is actually designed to help you avoid the exact CEL you have, but they do break and can be installed incorrectly.

I would disconnect the sensor plug with the ignition switch to "ON". Use a multi-meter to measure resistance between the black/green stripe wire (sensor ground) and a good chassis ground (battery ground wire on firewall or ground wire on top of intake manifold). Resistance should be almost zero. A really high resistance or no connection could affect the sensor's output. Use the multi-meter to measure voltage difference between the green/yellow stripe wire (sensor power) and a good chassis ground. Voltage should be around 5 volts. A high voltage could affect the sensor's output. Use the multi-meter to measure the voltage difference between the yellow wire/white stripe (sensor output to ECU) and a good chassis ground. The voltage should be almost zero. If you get a voltage similar to the sensor power you measured earlier, you probably have a short between the sensor power wire and the sensor output wire. If you pass these three tests, the next step would be to buy a new MAP sensor. If new sensors look too expensive, I've got a used, tested sensor that I would part with for a reasonable price (PM me).

Corbin
'95 ESI-T

Now with more power and fewer leaks



Gimme fuel...Gimme fire...Gimme that which I desire

thank you so some much bro !