i took the immelizer out of the cherokee and wired it up to the yj and the jeep burst into life.
the strange this is it didnt need the key or anything els, which made me happy as larrry.
but i should mention that i had to buy pass the starter relay i hooked up a wire direct from the starter motor and the wired that to the G5 green wire start relay crank.
yellow D5 that is connected to the blue/white wire
Red D4 connected to the black/pink wire
Red E4 connected to the red/black wire as SLO had suggested.
and the best was to come the wires of the skim key came disconnected and the jeep still would start so i thought i would try disconnect all the wires on the skim connector and the jeep still jumped into life.
When you said here that the engine jumped to life, how was it getting fuel? was there a temporary fuel pump hooked up somewhere? Or were you pouring fuel in the throttle body? I'm wondering if there is an issue with the fuel injectors?
ok i couldnt wait lol,
thanks for the info SLO
so i went a head with wiring the orange wire op to the green white wire what i have done, i moved the orange wire pin A6 to B4,
the reason why is because pin A6 is not used at all on my set up.
When i turnded the key to prime the fuel pump it kicked in just like it did on the cherokee
The way you wired it, I think you bypassed the computer. When you turned the key and the fuel pump primed, did it stay on as long as you had the key turned, or did it go for a couple seconds then shut off? It should shut off after a couple seconds if the engine is not running.
Any way so i turned the key and fingers crossed hoping it would start, with no successes at all.
the only way it will start is if i poor fuel direct into the throttle body.
So, you know it's getting spark. If you keep a steady stream of fuel pouring into the throttle body, will it keep running?
Have you checked the fuel pressure at the fuel rail? There should be a Schrader valve on the rail with the injectors where you can check pressure. The '96-'99 engines need around 50psi (340 kPa).
Also, have you checked for power to the injectors? There are two contacts for each injector. One should be constant 12V when the key is on. These are all spliced together, and to the coil(+). The other is a switched ground that is controlled by the ECU.
I assume that the injectors function properly, as you said the engine ran in the XJ before you pulled it.
Also not to for get ive got the green wire from the YJ directly connected to the starter motor that's the only way the motor will turn over.
using the other wires on the xj harness don't do anything if i connect them to the green wire
The starter circuit is completely separate from the rest of the electrical system. If it's working for now, there is no need to mess with it.