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Home >> Land Rover >> 2015 >> Range Rover Autobiography >> Repair and Diagnosis >> External Pages >> Different car >> Section 33 (Electronic Engine Controls - V8 S/C 5.0L Petrol -- Range Rover/L405) >> Electronic Engine Controls - V8 S/C 5.0L Petrol >> Electronic Engine Controls (Description And Operation) >> Description And Operation >> Operation >> Powertrain Control Module Relay

Powertrain Control Module Relay

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

When the ignition is turned on (power mode 6), battery voltage is applied to the ignition sense input from the Body Control Module/Gateway Module (BCM/GWM). The PCM then starts its power up routines and energizes the PCM relay.

When the ignition is turned off (power mode 0 or 4), the PCM maintains its powered up state while it conducts the power down routines. This can be for:

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

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