I Have a 94 cherokee country with a 56028297 ecu,it has no power at the grey wire at the ecu,it does flash sometimes and I can hear the relay work sometimes. I can bypass the fuel pump relay circuit and power up the light and the auto shut down relay clicks Any Suggestions

Look at your dash gauges when you turn on the ignition....is the check engine light coming on? If not, your ecu computer needs to be repaired since the ecu will not sent power to the main relays until that check engine light comes on. No power to the main relays means no power to your ignition coil or fuel pump. Repair services are available.

Hello

Power for the fuel pump is supplied by fuse #16 in the Power Distribution Center (PDC), goes through the Fuel Pump Relay and then to the Fuel Pump and the ground completes the circuit. Power for the Fuel Pump Relay coil is supplied by fuse #18 in the PDC and the Powertrain Control Module (PCM) supplies ground. It is a fairly simple circuit to check.
The first thing to do is check all the fuses, especially #16 and #18. If you have they are good then you will need to pull the fuel pump relay and check for power, with the key ON at the dark green/black wire and orange wire. The DG/BK wire is the power for the fuel pump and the OR wire is the power for the relay coil. If you have power there connect a jumper between the DG/BK wire and the dark green/white wire. You should hear the fuel pump running. If not there is a problem in the DG/WT wire from the relay to the pump.
Okay, lets assume that checks out fine, the next thing to do is replace the fuel pump relay and ground the dark blue wire. You should hear the fuel pump running. Okay? Good, now go to the PCM located on the firewall in the engine room. It has three large connectors, black, white and grey. There is a DB wire in cavity 19of the grey connector. Ground this wire and you should hear the fuel pump running. If it does then the wiring for the fuel pump circuit is all good and the PCM will need to be replaced. If it doesn't run, then you have a problem in the DB wire between the relay and the PCM.

problem is not related. the wire harness in the drivers door [**** rarely passenger door] has one or more broken wires inside that rubber belows in between the door hinges.

Make sure all your grounds are clean and secure. I'm sending a wiring diagram to you...different year but more accurate than anything you will see in haynes etc. http://www.scribd.com/doc/18999822/Jeep-Wiring-2
take a look at it and perhaps you can get it figured out!
good luck

it sounds like the power wire came off or broke from the ignition switch ,if you can test each wire with the column
cover off,you should be able to determine which one powers the fuse for turn signals

Co9l should get power from the alternator while cranking, through the starter relay then switches to power from the engine control unit after startup. Check power at ecu and check over stuff you have installed (sometimes new does not mean it works) then check the auto shutdown relay...if no power coming from there, you won't have spark.

I don't have a solution yet but my 94 jeep cherokee does the very same thing. I thought it might be in the rear axile.

My schematic lies to me a lot but here it is: dark blue:goes to gauge, dark green with red stripe is pump power and black is ground.
Hot wire should have 12v, dark blue should have pulsing voltage and black should be absolute ground.

try replacing the ignition switch(not the ignition lock[where the key goes]).it will probably be located on top of the steering column , towards the bottom.but before going through with this make sure the connectors to the switch are fully plugged in.

Hi

It could be from the sounds of it but just to be sure you need to count the flashes and pauses from the light because it is actually flashing a fault code at you.

If you want to check it I think it is located above the brake pedal on a bracket which also mounts a few other gadgets.

It will either be grey or orange.

Regards

Geordie