90xj06
NAXJA Forum User
- Location
- Peabody, MA
88 Cherokee 4.0
Im having this interesting voltage issue. i have a REM device that reads the ECU data from the diagnostic output. and im getting a low voltage reading from that. it reads the voltage when the B+ Latch relay is closed and i would surmise that this should be battery voltage. but im showing it down to 11.5 volts occasionally. but mostly down to 12.5v with the a/c on. across the battery is 13.7v. also the gauge cluster also reads low. i have checked grounds and clipped a jumper to different parts of the body. nothing changed.
what i did notice if i probe the diag connectors for B+ and B+ ground. i get 13.7v on the positive side. and if i check the ground side im showing .8v to the negative side of the battery. and this makes me think i have a bad ground. i checked the ecu ground and o2 relay ground and all show 0v to ground.
im not sure what relay it really is but the second one from the left when removed causes the B+ ground to drop to .3v
i do still have the C101 Connector but im not sure if any of the circuits go through that.
Im having this interesting voltage issue. i have a REM device that reads the ECU data from the diagnostic output. and im getting a low voltage reading from that. it reads the voltage when the B+ Latch relay is closed and i would surmise that this should be battery voltage. but im showing it down to 11.5 volts occasionally. but mostly down to 12.5v with the a/c on. across the battery is 13.7v. also the gauge cluster also reads low. i have checked grounds and clipped a jumper to different parts of the body. nothing changed.
what i did notice if i probe the diag connectors for B+ and B+ ground. i get 13.7v on the positive side. and if i check the ground side im showing .8v to the negative side of the battery. and this makes me think i have a bad ground. i checked the ecu ground and o2 relay ground and all show 0v to ground.
im not sure what relay it really is but the second one from the left when removed causes the B+ ground to drop to .3v
i do still have the C101 Connector but im not sure if any of the circuits go through that.