alarm immobiliser ecu

matt1295 · Feb 3, 2013

does the alarm and immobiliser run through the ecu

cars being in the garage and im bk there tomorrow but there suspect the ecu is at fault for my TC/hdc light on

something to do with the input being only approx 2.5 volts when its ment to be 10v

Nodge68 · Feb 3, 2013

Engine ECU is programmed to match the alarm ECU. The Abs ECU has no communication with the alarm ECU. I can't see the engine ECU putting the hdc light on? Although the Freelander always has a for surprise me!!

matt1295 · Feb 3, 2013

the garage still have the car im just supplying info they have told me

the input from the ecu to the abs ecu is ment to be 10v and mins only reading approx 2.5v

this voltage comes out of the Engine Ecu which is why there thinking it is that to fault... im going there myself tomorrow to speak to them in person but i was asking bout the ECU being linked to alarm as i can pick up a new engine ECU for £30 but wasnt sure if it needed coding or not

Nodge68 · Feb 3, 2013

matt1295 said:
the garage still have the car im just supplying info they have told me

the input from the ecu to the abs ecu is ment to be 10v and mins only reading approx 2.5v

this voltage comes out of the Engine Ecu which is why there thinking it is that to fault... im going there myself tomorrow to speak to them in person but i was asking bout the ECU being linked to alarm as i can pick up a new engine ECU for £30 but wasnt sure if it needed coding or not

Yes the engine ECU is coded to the alarm but iirc a second hand ECU can't be re-coded so you would need a new one!!
There is a K line bus to the Abs ECU but I don't think it should be 10 volts? I would think 5 volts peek to peek would be closer to the correct voltage which would read 2.5 volts on a digital meter. A scope is the best way to check the data link.

matt1295 · Feb 3, 2013

i was told that i could get a 2nd hand unit and it could be reprogrammed to work

td4van · Feb 4, 2013

Depends on what model year freelander you have. 2001MY onwards (1A chassis onwards) you cannot recode the immob code in a used ecu.

I'd be surprised it's the engine ecu that's causing your issue - more likely to be an input to the engine ecu causing the issue such as throttle switch for example.

alarm immobiliser ecu

matt1295

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