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The replacement ECU works fine now. It turns out that a fuse had blown. Apparently when the other ECU finally went bad, it pulled additional amps taking the fuse out with it. It reminded me of a light bulb that's at it's brightest just before burning out. Anyway, it's running good now. I just...

Do I need to get the VIN flashed onto this replacement ECU to get it to work? It is a 1998 Grand Cherokee Laredo 4x4 4.0l auto.

I just finished installing the ECU with the same results. No voltage to coil, no start, fuel pump runs continually. Any ideas. This thing is a sitting duck. I can only do so much testing with the engine off. All of the sensors are getting 5 volts. I was told that if I unplug the CKP sensor the...

The replacement ECU arrived today. I'm going to be installing it tomorrow. I made sure to match everything between the old ECU and the replacement when ordering. Everything matched except for the serial number of course. Is there anything that I need to know when installing the replacement? Is...

I found the following site and tried what this person did but it didn't work. This person wasn't getting any voltage on the TPS connector until they unplugged the crank position sensor, then the voltage came back. So, the CKP sensor was bad. Here is the link. Troubleshooting: 1998 Jeep Grand...

Are you referring to the two screws under the 3 connectors on the front of the ECU? I mentioned that the fuel pump runs non-stop until the key is turned back off. Will a faulty Auto Shut Down relay or fuse cause the fuel pump to do this? I had swapped the ASD relay for another identical...

I'm unable to pull codes because my analyzer cannot communicate with the ECU. It tells me to turn the ignition to the run position when it is. It would link up fine with the ECU before this happened. Do you know which pins feeding the ECU with power that I can check so that I can determine if it...

Well, I added spacers to the two screws that go into the ECU and noticed that the ECU went from almost fire hot to just warm and my uncle drove the Jeep for 3 days and then it finally died and would not start again. I have since noticed that the fuel gauge doesn't work, the check engine light...

well ain't that somethin. I ended upcleaning all connections, removing the ECU and cleaningit's connections, cleaning and sanding the grounds, and battery terminals. Did you say that you replaced your crank position sensor also? My uncle wants to give it to his daughter but doesn't want it to...

I'm working on a 1998 Jeep Grand Cherokee Laredo 4.0L that belongs to my uncle. What happens is it wants to shut off while driving. It starts around 15 minutes after started. I found that the bushing in the distributor was worn out to the point that the rotor would bounce around inside. He had...