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Engine Control Unit Function Check

Model: Jeep Cherokee MK 3, KJ - Years: 2002, 2003, 2004, 2005, 2006, 2007
Part: Engine

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Video tutorial

The vehicle shown in the video exhibits an anomaly that is clearly out of the ordinary, as with the ignition on, almost all the warning lights on the dashboard are illuminated, the cooling fan in the engine bay activates, relays can be heard clicking on and off, and fuel is even leaking from the throttle body.

Since all these commands originate from the engine management unit, it is highly likely that the fault lies within this unit.

Diagnosing the fault is clearly difficult as it requires a special test bench capable of simulating the vehicle to which the unit is connected and the relevant wiring diagrams. This is a job for professionals and not something that can be resolved as a DIY task.


Updated on 16 February 2026 by ScegliAuto


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