Cranks over but does not start, fuel gauge shows empty, light is on. When it does run it goes about 15-25 min then shuts down. I already changed the cps. Tank has fuel.

SOURCE: oil gauge goes up and down.

If grounding the dash does not work, try putting a mechanical gauge on it and reading actual oil pressure. Pressure does change while driving, but should not wander. With mechanical gauge, check that running hot at idle (in gear if automatic) pressure should not drop lower than 15psi (I'd rather see 20) High reading should be around 40 -50 but no higher.Low pressure indicates a loss of supply or bad bearing on the crankshaft, high pressure may be caused by sticking pressure relief or restriction in an oil passage.

SOURCE: 2001 jeep cherokee cranks, no start, no bus

I just had the same problem of my 2001 jeep cherokee not starting with no gauges responding and a "no bus" reading. After reading the responses I changed out the CPS and my jeep now runs great! however, it was not as hard as I thought it would be. Very easy with 7/16 bit and a 10inch extender. In and out in less than 5 minutes. Finding it was the hardest part. Blends in with the bell housing. I did this from under the jeep with a good shop light. I paid about $80 for the part here in Atlanta, GA

SOURCE: 2000 jeep wrangler won't start, good crank, no bus

Check fuses first, but could be needs new CPU

Testimonial: "Thanks for your help, we checked the fuses even swapped out the relays. The CPU was a thought but someone else tried it and it didn't work. Might still try it though. Is there any other symptoms that would indicate the CPU is bad? We changed out the ignition switch, 135.00, changed the CPS, 42.00. I hear the CPU is about 150.00. When we run the tester it comes back with no error codes."