IPrice

What values would I see at the Ignition Test Connector going to/from the PCM?

I've been having some trouble today trying to nail it down, and just short of pulling it off the car, I'm thinking that theres got to be a way to test for voltage between the PCM and OPTI at that connector.

I've lost spark completely and everything checks out according to 'Box's How To....

Thanks fellas,
Ivan

Injuneer

I assume you are asking about the gray connector for the Opti, on the passenger side of the intake manifold. As you Opti rotates, the voltage on the low res signal wire should vary in a square wave between 0 and 5V. It will pulse 8 times for each 2 crank revolutions, with a variable duration on every other pulse. You could check the high res signal similarly, but the switching is much more rapid because it will pulse 360 times for each 2 crank revolutions. The voltages on the other two wires are shown in Shoebox's pinout lists. B3 (pink/black) is ground and B14 (red) is battery voltage.

IPrice

Thanks brother....great info!!!

-Ivan