I need to reset the MIL and I can't seem to find the wires that need to be changed. I read in a haynes manuel that you just switch the wires but I don't see them. I don't know exactly where to look. I saw a blue striped grey wire with a white striped grey wire that goes to nothing but goes under the dash from the passenger side to the driver side and it is tucked under a plastic near the driver door. There is red striped grey wire with a white striped grey wire that seems to be going the opposite way. 1988 MAZDA B2200 from CA

 

Drivers side underdash on the large wire harness coming through the firewall.

 

At 60K miles, 80K, 120K, etc., the Malfunction Indicator Light will come on, supposedly so you get dealer to check emissions but more likely so they can try to sell you a timing belt replacement. By the way, do get the timing belt replaced every 60K miles, and maybe get the water pump changed at the 120K point along with it, as it's an internal water pump, behind the timing belt, and mine started leaking at that point, so it's a big labor savings $$$ to do both at once. The Malfunction Indicator Light is re-set by swapping a wire push-on connector under the dash, driver side, right next to the firewall; it's hard to see, lie down and look up, there will be a bare connector, just swap it, then swap back next time the light goes on at that set interval.