Engine Control Module (XJR, XJ8 & XK8)

The Engine Control Module (ECM) controls the engine management system. The ECM is located in the control module enclosure at right rear of the engine compartment. An electric fan ventilates the enclosure with air from the passenger compartment. The ECM maintains optimum engine performance under all operating conditions by metering fuel delivery into each cylinder, and adjusting ignition timing.

The ECM receives inputs from engine related sensors and various vehicle systems and provides output for the following: electronic throttle, fuel pump, fuel injection, ignition system, EVAP system, variable valve timing, EGR system (if equipped), engine starting, HO2S heaters, instrument cluster, A/C compressor clutch, windshield and rear window heaters, radiator cooling fans and diagnostics.