Either behind the knee panel under the glove box RHD model or in the boot(trunk) behind the panel behind the spare wheel
Bad ECM or ECM relay.
1991 jaguar jx6 will not start
The ecm module is located behind the passenger side kick panel. I don't know of an ecm relay.
behind the radio
i have a 1991 sovereign xj6 and i have the same problem, BUT the gauge would show correct levels when accelerating
Behind the glove compartment.
Next to the battery.
the ECM is located under the hood on the driver side fender it is in a black box i just replaced it
To remove the ECM (Engine Control Module) from a 1991 Pontiac Bonneville, first disconnect the negative battery cable to ensure safety. Locate the ECM, which is typically found under the dashboard or in the passenger side footwell. Unplug the wiring harness connected to the ECM and remove any screws or bolts securing it in place. Finally, carefully pull the ECM out of its mounting location.
In a 1995 Jaguar XJ6, the SRS (Supplemental Restraint System) ECM (Electronic Control Module) is typically located beneath the center console, near the passenger side of the vehicle. It may be mounted to the floor or side of the console area, making it somewhat accessible for service. Always refer to the vehicle's service manual for exact placement and any specific removal instructions.
It is inside the ECM Module
replace the ecm