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CEL is certainly working because it threw a code for the TPS recently and a while ago for the Cam Position Sensor. That was with an actual OBDII scanner. When I did the jeeps odometer trick, it threw code 12 (bat. disconnect), 42 (ASD relay), and 45 (turbo??) Then it threw out 55. However, the heater circuit on both oxygen sensors read 0 v... Shouldn't it read 12 v? I did it with engine on and engine off just to make sure. I even used 2 different meters
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Yes there should 12-14 volts to the heater in the O2 sensor with the engine running. Not sure if yours has a relay or not, the Renix 87-90 has relay and no fuse, later years have bunch of stuff on one fuse including the O2 sensor heaters. You may have connector issues, or damaged wires or blown fuse... need to find the FSM wiring for your year and find the routing for that wiring. What year is this one again, I forget.