The other difference is control of power to oxygen sensor heaters
On California with 4 sensors the PCM controls power to sensor heaters via upstream and downstream oxygen sensor heater relays. The PCM turns these relays on and off and monitors sensor output in response as part of tighter emissions
On federal the two oxygen sensors heaters get power directly from ASD relay which also powers coil rail so PCM cannot switch on and off while running, so a less robust control and monitoring of sensor function
Also of note 2000 was last year of CCD bus and when TJ switched to PCI bus in 2001 they went to one emission standard and one engine tranny specific PCM for all 50 states no more federal vs calif
So a calif 2000 4.0 harness in a 2000 federal TJ both 4.0 and only changing harness should be plug and play except for these things
after hook up two unused oxygen sensor plugs
After hook up unused harness plug for Evap emissions pump
Unused relay connections for upstream and downstream oxygen sensor heater control relays
Have to add jumper from splice from ASD relay to the two outputs where the two oxygen heater relays out put power thus allowing 12 volts plus out of ASD relay to go directly to both oxygen sensor heater power wires
It will work fine (plug and play ) but chech engine light will turn on because of the extra disconnected pulgs ( o2 sensors and evap plugs ) and pcm plugs would fit dirctly but there will be difference in reading and it will not do any harm
Nope assuming you keep the federal PCM no CEL as it ignores those extra wires but you have to rewire power to the two existing oxygen sensor heater power wires directly to ASD relay output
The installed harness is in bad shaped .. The guy i bought the jeep form changed it and cut many plugs .. For example , The speedometer plug and t-case plug does not exist at all and the coil plug is not the oem . He literally invented that harness
My jeep is manual 5spd
I guess i will go for that calfi harness (56041474)
I would just replace the individual plugs with $1 pig tails from you pull it junk yard XJ and ZY WJ
Then some heat shrink over the solder joints
Would be much easier in the long run as removing and entire harness is a task I would not want to tackle with the power train still in the vehicle and short of a prior engine fire with melted harness I would repair rather than replace
I don't mind wiring but that is one big harness tied down in multiple difficult places
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