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Home >> Land Rover >> 2015 >> LR4 Base, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Electronic Engine Controls - V6 S/C 3.0L Petrol -- LR4/L319 >> Electronic Engine Controls - V6 S/C 3.0L Petrol >> Electronic Engine Controls (Description And Operation) >> Description And Operation >> Operation >> Engine Control Module (ECM) Relay

Engine Control Module (ECM) Relay

The Engine Control Module (ECM) relay is used to initiate the power up and power down routines within the ECM. The ECM relay is installed in the Engine Junction Box (EJB).

When the ignition is turned on, battery voltage is applied to the ignition sense input from the Central Junction Box (CJB). The ECM then starts its power up routines and energizes the ECM relay.

When the ignition is turned off, the ECM maintains its powered up state while it conducts the power down routines. This can be for:

On completion of the power down routines the ECM de-energizes the ECM relay.

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