Engine Control Module (ECM)

The ECM is located at the rear of the engine compartment, between the bulkhead and the engine sound insulation. The ECM is located in a plastic molded carrier which in turn is located in a bracket attached to the vehicle structure.

The ECM is connected to the vehicle harnesses via 2 connectors. The ECM contains data processors and memory microchips. The output signals to the actuators are in the form of ground paths provided by driver circuits within the ECM. Some output signals take the form of high side drive signals. The ECM driver circuits produce heat during normal operation and dissipate this heat via the ribbed casing.

The ECM performs self diagnostic routines and stores fault codes in its memory. These fault codes and diagnostics can be accessed using a Land Rover approved diagnostic system.

If the ECM is to be replaced, the new ECM is supplied 'blank' and must be configured to the vehicle using a Land Rover approved diagnostic system. A 'flash' EEPROM (electrically erasable programmable read only memory) allows the ECM to be externally configured, using a Land Rover approved diagnostic system, with market specific or new tune. The current engine tune data can be accessed and read using a Land Rover approved diagnostic system. When a new ECM is fitted, it must also be synchronized to the CJB using a Land Rover approved diagnostic system. ECM's cannot be 'swapped' between vehicles.