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Home >> Jaguar >> 2015 >> XFR-S >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Electronic Engine Controls - V8 5.0L Petrol/V8 S/C 5.0L Petrol -- XF/X250) >> Electronic Engine Controls - V8 5.0L Petrol/V8 S/C 5.0L Petrol >> Description And Operation >> Electronic Engine Controls - System Operation And Component Description (G1452621) >> Main Relay

Main Relay

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The main relay is used to initiate the power up and power down routines within the ECM. The main relay is installed in the EJB.

When the ignition is turned on, battery voltage is applied to the ignition sense input. The ECM then starts its power up routines and energizes the main relay.

When the ignition is turned off, the ECM maintains its powered up state while it conducts the power down routines (up to 20 minutes in extreme cases, when cooling fans are required) and on completion will turn off the main relay.

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