mattcarlson7
New Member
- Joined
- Dec 4, 2017
- Messages
- 5
- Reaction score
- 0
- Points
- 0
- Vehicle Year
- 1994
- Make / Model
- Mazda
- Transmission
- Automatic
Hello,
I bought a 1994 Mazda B4000 for cheap and am trying to bring it back to 100%. It runs foul in open loop, when the computer should be controlling everything. When we put the computer on it, back probe the pins on #2 side and run a 12v test for the O2 sensors we get a solid 1.22v output and 0 like we should. When we back probe the #1 side the voltage only goes up to .5 and bounces when 12v is applied and is a constant 0 when it is put on negative. We pulled the #43 and #44 pins, the input from the O2 sensors into the computer, and shot 12v straight into the computer. There was no change. Initial thought was the computer was bad, its sending bad signal or changing signal wrong. however we changed the computer and all the outputs were still the same. We are absolutely lost. We checked for grounds, bad pin connections, everything. HELP...
I bought a 1994 Mazda B4000 for cheap and am trying to bring it back to 100%. It runs foul in open loop, when the computer should be controlling everything. When we put the computer on it, back probe the pins on #2 side and run a 12v test for the O2 sensors we get a solid 1.22v output and 0 like we should. When we back probe the #1 side the voltage only goes up to .5 and bounces when 12v is applied and is a constant 0 when it is put on negative. We pulled the #43 and #44 pins, the input from the O2 sensors into the computer, and shot 12v straight into the computer. There was no change. Initial thought was the computer was bad, its sending bad signal or changing signal wrong. however we changed the computer and all the outputs were still the same. We are absolutely lost. We checked for grounds, bad pin connections, everything. HELP...