a little help here...need to tap the map sensor and the directions say...on block behind fuel filter canister...locate map sensor....three wire plug...the pic in the instructions display a black, orange/or red (cant tell) and a green wire. it says to tap the wire on the bottom...which is the green one in the illistration...

if i have my map sensor which i think i do....i have a black, orange/red, and a gray or white one...NO GREEN...

and i cant tell which is the "bottom" wire..it looks to be the white/gray one but that is only bottom to me because it is lower and faces the firewall the other wires are toward the grill...

help....

NCA

 

Pull the plug for the MAP wiring harness and look at it face on with the tab at the top. The terminal on the upper left is for the orange wire, the terminal on the upper right is the black/light blue wire, and the single terminal at the bottom is the gray/red wire.

You are correct, there is no green wire on the MAP on the 24 valve engine.

If you are checking voltage be real careful. The MAP grounds through the ECM so do not use anything with external power. The only field testable conditions are to turn the key off, then unplug the MAP harness. Then turn the key on and test the voltage from the orange wire on the harness side to a good engine ground - it should be 5 volts or within a frog hair. Then check the black/light blue wire on the harness to ground with a ohmmeter, There should be continuity, if not the problem is the ECM.

It is next to impossible to get a useful reading by testing any of the MAP terminals themselves. So, do not even bother.

If the first two tests are positive, then the MAP has failed. If the first two tests are negative, then either the ECM connector has failed or the ECM has failed.

Most often it is the MAP that fails.

 

thank you....so if the directions tell me to TAP the "bottom" wire...that would be the SINGLE gray wire....

thanks

NCA

 

got the wire i needed....tap placed properly...and everything is a go....

thanks for the help..RCW

NCA