Question about Jeep Cherokee

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Immobiliser - no spark.

I have replaced the ECU unit and the immobiliser. i cannot disalarm the immobiliser and theres no spark in the spark plugs.

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  • yadayada
    yadayada May 11, 2010

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  • Jeep Master
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Dealer only emmisionwiz is right

Posted on Feb 18, 2009

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91 4 runner immobiliser with an equator immobiliser


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I have a toyota4 runner which has an equator immobiliser now she won't fire have spark and fuel but won't start As old as this vehicle is you might think of replacing it with one that fires has spark and fuel.Goodluck )

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I have got toyota noah which wont start. the cranking its there. battery is good. there is no powere to fuel pump. fuse all ok. even changed the engine control unit.


If the vehicle is fitted with an immobiliser that could be the problem. Have you checked for a spark?

If an immobiliser is fitted the new engine ECU will have to be coded before it will work.

A wiring diagram is almost essential to diagnosing the problem. There is likely to be a relay controlling the supply to the fuel pump but what controls the relay? If the relay is controlled by the engine ECU there will be no supply until the immobiliser is disarmed.

If the vehicle was presented to me I would check for a spark and if a spark is present I would provide a temporary supply to the fuel pump to test if the engine starts, proving the fault is not immobiliser-related but a wiring or switching problem.

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the car still cranks but some immobilizers cut fuel and spark

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Immobiliser location


The immobiliser ECU is in the side of the passenger footwell.Remove front plastic panel, then remove the side plastic panel. You should the be able to access the immobiliser ECU.

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run fault codes and look for a cam/ crank sensor problem. Check that the immobiliser is recognising your key

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You have an immobiliser issue which unfortunately will require the assistance of a decent auto electrician. The key is not talking to the immobiliser ecu

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sounds like the immobiliser is dead. 1996 immobiliser in south africa qould leave the car dead but 97 onwards cuts out the fuel supply so car starts and dies. it might be fuel relay but i doubt it. try throqing fuel into the intake manually. if it stays on for longer its prob not immobiliser.

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Francois Silver ? Walvis Bay - Namibia I have a 97 Chevy K2500 Cheyenne V8 fuel injection. I have a starting problem. When turning the ignition key, the fuel pump comes on and stops after 2 to 3 seconds....


It has nothing to do with ECU and immobiliser even if you turn your ECU OFF your car will start and will your but not properly without CPU your car will work in emergency mode. try finding Idle sensors and check them if they are ok

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