I have a 1996 jeep cherokee. 4.0 4wd. i was driving it one day and it just cut off. i replace the crankshaft sensor the coil the distributor and nothing fix it. i can run a wire from the battery to a switch to a green and orange wire that runs to the coil and it will start fine. i found that this wire runs from the coil to the injectors to the ecm. what can be my problem. please help

 

Can someone please help me

 

i have also replace ignition switch

 

can anyone help me

 

I apologize for not having the answer you are in search for but why not just leave the wire you connected? Then you would have a kill switch.

 

Looking at the wiring diagrams, that wire also connects to the automatic shutdown relay. The diagrams are not too clear where the connection is made. This relay is fed thru fuse #20 a 30 amp. fuse. The ASD relay feeds the coil, alternator field, injectors, oxygen sensors and connects to the PCM.

By connecting the wire and switch as you have done you are apparently bypassing the relay. I would check the fuse, relay operation and check for voltage at the wires. A shorted oxygen sensor will blow fuse #20 so check the sensors also.

The PCM controls this relay. It turns on for a short period when you first turn the key on. This also turns on the fuel pump relay and the fuel pump will run for a short period. You should hear the fuel pump run as it pressurizes the fuel system. The PCM then turns the relays off until you crank the engine and it reads the info from the varies sensors.

 

so i should check the automatic shutdown relay and my sensors. where is the automatic shutdown relay.

 

Not that familiar with the Cherokee model. Look for the power distribution center in the engine compartment. May be behind the battery. The ASD relay should be inside. The PDC cover should indicate its position.

 

all my relays are good and i do not have any blown fuses. could it be the pcm causing this or could it be tht i need to replace the fuel injector wiring harness