code 12, means ECU is happy
the ECU can only discover, dead sensors (but can show code 51, weak EGR)
and not weak sensors.
its very crude here. unlike say a 96+
it also remembers, if you unplug a sensor key on,
to erase DTC errors pull the DOME fuse,
but ive no idea where you harness maker wired, the ECU memory wire (dome)
here is my cheat sheet, drawing on your ECU, it tells you what ever pin does.
http://www.fixkick.com/ECU/92-95MPI-eng-...e-huge.png
see pin A1, this was DOME, fuse, in the donor car. white wire, is DOME fuse. so we pulled the fuse to erase all DTC memory stored errors.
A1 must be tired to battery , not ignition power,
that is so it can't forget, it's a feature, you drive, you see CEL glow, you come home , set the diag jumper and it pulse out the error codes, you stored driving, even key on not running.
see my DLC2 pins, I added all pins, numbers and colors and the words.
it shows which pins are input and which are output
and I corrected the silly wiring error they had in the TPS idle circuit.
the ECU can only discover, dead sensors (but can show code 51, weak EGR)
and not weak sensors.
its very crude here. unlike say a 96+
it also remembers, if you unplug a sensor key on,
to erase DTC errors pull the DOME fuse,
but ive no idea where you harness maker wired, the ECU memory wire (dome)
here is my cheat sheet, drawing on your ECU, it tells you what ever pin does.
http://www.fixkick.com/ECU/92-95MPI-eng-...e-huge.png
see pin A1, this was DOME, fuse, in the donor car. white wire, is DOME fuse. so we pulled the fuse to erase all DTC memory stored errors.
A1 must be tired to battery , not ignition power,
that is so it can't forget, it's a feature, you drive, you see CEL glow, you come home , set the diag jumper and it pulse out the error codes, you stored driving, even key on not running.
see my DLC2 pins, I added all pins, numbers and colors and the words.
it shows which pins are input and which are output
and I corrected the silly wiring error they had in the TPS idle circuit.
http://www.fixkick.com