unhook the battery for about 10 seconds...
For the 2.2 liter engine it's located between the fire wall and the engine near the top.
Did you disconnect the battery for a while?
The ECU is located behind the glove box.
The ECU in a MY 1999 Subaru Forester is located at the upper left site of the engine under the air intake.
The ECU (Engine Control Unit) on a 1999 Isuzu Frontera is typically located under the dashboard on the driver's side, near the steering column. It may be mounted to the side of the dash or behind a panel, so accessing it may require removing some trim pieces. If you need to locate it, consult the vehicle's service manual for detailed instructions.
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It is under the hood on the drivers side.
ECU fuse
I just changed mine the other right behind the ecu towards towards the left of ecu which sit on top of engine looks round
The ECU on your Cherokee should be located on the inner fender under your hood on the driver side.
The ECU is located inside the passenger compartment under the console where it fits up against the dash.