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Federal vs california tj engine harness

4K views 12 replies 3 participants last post by  3losh07 
#1 ·
I am looking for an engine wire harness for my tj model 2000 and 4.0 l

I found that there are 2 types , harness which came specified for California jeeps

And the other one is specified for fedral jeeps

My jeep is federal and i found a Californian harness for 2000 tj which is same model i have ,

My questions are ,

would it fit with out problem in my jeep?

What other differents are there ? Beside the O2 sensors ?

I live outside usa and i have no problem driving with disconnected 02 sensors

But i want replace my malfunctioning harness. It is in bad shape and can not be fixed

My harness Part number is 56041443AG , i looked for it everywhere for a year but couldn't find it

The part number for the harness that I am interested in is 56041474
 
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#4 ·
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
 
#5 ·
Only differences on PCM plugs are

C1 black California has added A26 and A29 for oxygen sensor signals sensors 2/1 and 2/2

C2 white no difference

C3 Gray has 2 extra wires at C8 and C9 with C8 to upstream oxygen sensor heater relay control and C9 to downstream oxygen sensor heater relay control

Also C3 gray has pins 10 and 14 for leak detection pump solenoid control and leak detection pump switch sense

Other than that calif and fed PCM pin out the same for 2000 4.0 (course auto vs 5 speed have added tranny converter lockup control pin)
 
#6 ·
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
 
#7 ·
Just to summry what have been said

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
 
#11 ·
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)
 
#12 ·
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

Best of luck whatever way you go
 
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