I know this is a common problem but all the usual fixes are not working for me, no surprise since my jeep is very unique.
What I have:
2001 XJ with an LS3 engine in it. I kept the original XJ computer and plugged the XJ sensors right into the LS engine. The XJ computer is supposed to act as a gauge mule and I expected all of the gauges except the Tach to work. None of them respond, other than the oil pressure gauge moves 1/4".
I checked all the fuses, no problem there. I checked all the grounds, even the dreaded G108. All good. I even re- grounded the transmission control unit thinking there was a hidden ground in that harness somewhere that was causing me problems.
If i hold the Odmeter button down while turning the key to on, my guage cluster goes through its little dance no problem.
I cleaned and recleaned all the connectors to the cluster. I also checked for continuity on the grounds (good) and the BUS + and - (good) it is getting the signal from the computer.
I measured the voltage at the DLC pins 3 to 4 and 11 to 4 I get 2.49V and 2.51V. I measured the impedance and got 60 Ohms.
I unplugged the TCM, ACM, RKEM. Still no gauges!
I even filled the gas tank.
Another problem that I discovered on this odyssey is that my scanner will not connect with the jeep computer. The scanner works on all my other vehicles. I get good voltage at the DLC. The ground on pin 4 was bad so I made a new one. I think that this has something to do with my problem. Any thoughts from you gurus out there?
Anyone in the san diego area that knows about these things?
What I have:
2001 XJ with an LS3 engine in it. I kept the original XJ computer and plugged the XJ sensors right into the LS engine. The XJ computer is supposed to act as a gauge mule and I expected all of the gauges except the Tach to work. None of them respond, other than the oil pressure gauge moves 1/4".
I checked all the fuses, no problem there. I checked all the grounds, even the dreaded G108. All good. I even re- grounded the transmission control unit thinking there was a hidden ground in that harness somewhere that was causing me problems.
If i hold the Odmeter button down while turning the key to on, my guage cluster goes through its little dance no problem.
I cleaned and recleaned all the connectors to the cluster. I also checked for continuity on the grounds (good) and the BUS + and - (good) it is getting the signal from the computer.
I measured the voltage at the DLC pins 3 to 4 and 11 to 4 I get 2.49V and 2.51V. I measured the impedance and got 60 Ohms.
I unplugged the TCM, ACM, RKEM. Still no gauges!
I even filled the gas tank.
Another problem that I discovered on this odyssey is that my scanner will not connect with the jeep computer. The scanner works on all my other vehicles. I get good voltage at the DLC. The ground on pin 4 was bad so I made a new one. I think that this has something to do with my problem. Any thoughts from you gurus out there?
Anyone in the san diego area that knows about these things?