I drove the car today and the check engine came back on. Is it possible that the sending unit is bad which gives the PCM an out of range reading. The gauges are mechanical and the RPM at idle is about 500 or so. Also, there are two wires to the sending unit I think one was yellow and the other was black or some dark color, is one ground and the other to the computer or do they both go to the computer? I think the service manual said something about 5 volts to the sending unit and something I didn't understand about so many pulses. Is a DVOM a digital volt meter and does "back to the instrument bucket" mean to the back of the dash and is the laminate card the printed circuit?
Last edited by lamothe1; 03-06-2007 at 02:26 PM.