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Posts: 152
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Can anyone recommend a company i can send my ECU to who can delete the immobilizer?
97 jeep cherokee xj
Many Thanks
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Rich
Club Retro Rides Member
Posts: 6,233 
Club RR Member Number: 160
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Jeep immobilizer issuesRich
@foxmcintyre
Club Retro Rides Member 160
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Jul 11, 2019 10:07:00 GMT
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Apparently doing some quick reading the immobiliser isn’t part of the ECU, rather it’s a thatcham approved system fitted upon import (the US spec immobilisers didn’t conform to thatcham specification)
It should be simple enough to bypass the system, there are a few people who have found that their facelift XJ’s have had the system disabled. What is the actual issue you are having with the car?
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Posts: 152
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Jul 11, 2019 10:18:36 GMT
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yeah mine has the may and schofield unit fitted, its a bag of $hi7, it locks unlocks at random times and i have to keep resetting the remote.
ive found the May and schofield box under the steering column and traced the wires and disconnected it and re-plugged in the original loom.
the car now starts runs for a few seconds then switches off-ive been told this is due to the ECU not recieving a signal from the May and Schofield unit
I have priced up an ECU from the states but i wondered if it was possible to just disable the function on my ECU instead
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Rich
Club Retro Rides Member
Posts: 6,233
Club RR Member Number: 160
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Jeep immobilizer issuesRich
@foxmcintyre
Club Retro Rides Member 160
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Jul 11, 2019 11:51:53 GMT
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yeah mine has the may and schofield unit fitted, its a bag of $hi7, it locks unlocks at random times and i have to keep resetting the remote. ive found the May and schofield box under the steering column and traced the wires and disconnected it and re-plugged in the original loom. the car now starts runs for a few seconds then switches off-ive been told this is due to the ECU not recieving a signal from the May and Schofield unit I have priced up an ECU from the states but i wondered if it was possible to just disable the function on my ECU instead Ah, right. I see. I do wonder if a pre-facelift ECU can be used to overcome the issue. I am thinking unlikely. I’m still not sure that the function is within the ECU itself. Sadly none of my technical documents cover the facelift model, they are for the 1993/4 M/Y. |
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Rich
Club Retro Rides Member
Posts: 6,233
Club RR Member Number: 160
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Jeep immobilizer issuesRich
@foxmcintyre
Club Retro Rides Member 160
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Jul 11, 2019 11:55:00 GMT
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Checking on AutoData (admittedly not the worlds most exhaustive data source I will admit) there is no pin listing on the ECM for immo function or data line to that effect, which makes me think the unit is still stand-alone and ‘functioning’ somewhere inside the bowels of the electrical mess that lurks under the Cherokee Facia.
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Jul 11, 2019 17:06:21 GMT
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yeah mine has the may and schofield unit fitted, its a bag of $hi7, it locks unlocks at random times and i have to keep resetting the remote. ive found the May and schofield box under the steering column and traced the wires and disconnected it and re-plugged in the original loom. the car now starts runs for a few seconds then switches off-ive been told this is due to the ECU not recieving a signal from the May and Schofield unit I have priced up an ECU from the states but i wondered if it was possible to just disable the function on my ECU instead Sounds more like it's not getting fuel? Does the old immobiliser disable the fuel pump? |
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Phil H
Posted a lot
Posts: 1,448
Club RR Member Number: 133
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Jeep immobilizer issuesPhil H
@philhoward
Club Retro Rides Member 133
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Jul 11, 2019 18:05:15 GMT
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Quick fix used to be get an ECU from a Wrangler as they didn’t fit the immobiliser to those?
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Rich
Club Retro Rides Member
Posts: 6,233
Club RR Member Number: 160
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Jeep immobilizer issuesRich
@foxmcintyre
Club Retro Rides Member 160
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Jul 11, 2019 21:58:19 GMT
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yeah mine has the may and schofield unit fitted, its a bag of $hi7, it locks unlocks at random times and i have to keep resetting the remote. ive found the May and schofield box under the steering column and traced the wires and disconnected it and re-plugged in the original loom. the car now starts runs for a few seconds then switches off-ive been told this is due to the ECU not recieving a signal from the May and Schofield unit I have priced up an ECU from the states but i wondered if it was possible to just disable the function on my ECU instead Sounds more like it's not getting fuel? Does the old immobiliser disable the fuel pump? The description is the correct operation of the UK immobiliser, allows a start but then shuts the car down after a second or 2 of running. Which means the immobiliser is still present, weather it IS an ECM function or there is still a stand-alone module hidden away I am unsure, have run my tech data dry on the matter sadly. The wrangler of the same era would AFAIK also have a similar immobiliser system, it became mandatory on EU/UK type approved cars. Earlier TJ’s won’t have them, same as early XJ’s like mine but I don’t know if the ECM is forward compatible, and if it is if the immo is a separate part of the system (that’s what I’m lead to believe from the reading I've done) then swapping the ECM won’t help anyway. |
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Posts: 152
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Thanks for the replies
ive found a company on ebay they are in the states, I'm going to order a US spec ECU from them (they reckon they can program it with my mileage and VIN) so hopefully this is the way forward, should be around £200 all in
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Jul 12, 2019 14:48:23 GMT
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Immobiliser delete option must be possible, did you try any of the ECU specialists over here first?
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Posts: 152
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Jul 15, 2019 11:20:25 GMT
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Tried a couple of places all around the 200 quid mark and they couldnt guarantee that the ECU would work
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