Police ECU or not?

bugout · Sep 4, 2014

First, thanks to the guys that helped me diagnose my failed voltage regulator. I learned a lot. Couldn't have done it without you.

Second, my local parts stores says that there is a police ECU option for my heap. Can anybody tell me what the difference is? Not really interested in top speed, but higher shift points and or a high idle switch would be cool. Not sure if HIS does it by itself or if it needs the ECU?

96 HO, AW4, NP231, D30/D8.25, 31x10.50, RC 3in lift

jabinco · Sep 4, 2014

The computer itself is the same. The jeep parts listing shows the same part number for police/non-police.

The difference is in the firmware loaded on the computer. I have been down this road because I'd like to get the extended idle going.

The bad thing is that the dealer (at least mine) can't/won't program the non-police computer with the police firmware. They told me when they flash a pcm they go off the vin # and if your vin is non-police then you get the non-police firmware.

I'd love for someone with a 96 police package to loan me their vin, though I'm still not sure my jeep dealer would do it.

The other thing, maybe someone like FlyinRyan could do it.

Jason

devildog0 · Sep 4, 2014

I believe high idle is just a switch to a certain wire in the PCM.

http://www.jeepforum.com/forum/f11/extended-idle-switch-how-simple-easy-like-factory-610688/

jabinco · Sep 5, 2014

devildog0 said:
I believe high idle is just a switch to a certain wire in the PCM.

http://www.jeepforum.com/forum/f11/extended-idle-switch-how-simple-easy-like-factory-610688/

That's true of '97 and up, '96 has to have the police flash.

Jason

devildog0 · Sep 5, 2014

The guy in the thread I linked has a 96 and did the switch mod.

redneck · Sep 5, 2014

Quote from CommandoXJ96 on this thread, post #41...
http://www.naxja.org/forum/showthread.php?t=79549&highlight=fuse+box+location&page=3

For 1993-1995 I6 XJs:
PCM Pin # 10, Purple, [60-pin connector] (Switch On: 1V, Off:12V)

For 1996 I6 XJs:
PCM Pin # 12, dark blue/orange, [Black "A" 32-pin connector] (Switch On: 1V, Off:12V)

For 1997-2000 I6 XJs:
PCM Pin # 12, gray, [Black "A" 32-pin connector] (Switch On: 1V, Off:12V)

jabinco · Sep 5, 2014

devildog0 said:
The guy in the thread I linked has a 96 and did the switch mod.

I didn't see what year he has but I just read the entire thread and it's pretty clear it doesn't work on 96.

In post# 90 the op even admits it doesn't work on a 96.

If anyone has actually done this on a 96 I'd love to know how they did it.

Jason

Gary Briggs · Sep 5, 2014

After reading all this, I don't understand what the purpose of the mod, what are the advantages?

Digger87xj · Sep 5, 2014

Re: Re: Police ECU or not?

Gary Briggs said:
After reading all this, I don't understand what the purpose of the mod, what are the advantages?

Raises the idle. Improves alternator function to keep the battery from discharging with all the emergency lights running.
In a wheeling application this is useful when using a winch or on board air.

blondejoncherokee · Sep 5, 2014

Digger87xj said:
Raises the idle. Improves alternator function to keep the battery from discharging with all the emergency lights running.
In a wheeling application this is useful when using a winch or on board air.

Hmm. that is interesting . I like that idea.
In renix I wonder if I could wire in a 3 pole switch to go normal,

bugout · Sep 6, 2014

Thanks for the feedback. Good to know the ECU doesn't make a difference in reference to the EIS should I make a go at it. I doubt the flash does anything that a tuner doesn't do better. It just made sense to check since I needed the part anyway.

Hillbilly XJ · Sep 7, 2014

redneck said:
Quote from CommandoXJ96 on this thread, post #41...
http://www.naxja.org/forum/showthread.php?t=79549&highlight=fuse+box+location&page=3

For 1993-1995 I6 XJs:
PCM Pin # 10, Purple, [60-pin connector] (Switch On: 1V, Off:12V)

For 1996 I6 XJs:
PCM Pin # 12, dark blue/orange, [Black "A" 32-pin connector] (Switch On: 1V, Off:12V)

For 1997-2000 I6 XJs:
PCM Pin # 12, gray, [Black "A" 32-pin connector] (Switch On: 1V, Off:12V)

Thanks for posting this plan on doing it for my "99" a very useful app for off road use lights, winching. Learn something new everyday here it seems about my XJ.

sidewaysstarion · Sep 9, 2014

The 96 "Police" and Non/police ecu are exactly the same in terms of the calibration data, same goes for the later years. Also pulling pin A32 to ground will enable the extended idle function. I added a 4 position switch panel and an extended idle switch into my rig and modified the calibration to have a 1200 rpm extended idle.

jabinco · Sep 10, 2014

sidewaysstarion said:
The 96 "Police" and Non/police ecu are exactly the same in terms of the calibration data, same goes for the later years. Also pulling pin A32 to ground will enable the extended idle function. I added a 4 position switch panel and an extended idle switch into my rig and modified the calibration to have a 1200 rpm extended idle.

What year do you have?

sidewaysstarion · Sep 10, 2014

jabinco said:
What year do you have?

I have a 99

bugout · Sep 11, 2014

Mine is a 96.

Police ECU or not?

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