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Rover 400 Series Electrical System

The Rover 400 series employs a standard hard wired electrical system. Engine control is performed by the MEMS ECM, mounted at the rear of the engine bay on the Firewall. The ECM is a dynamic unit which adapts the the operation of the ignition, fuel supply and cooling systems to compensate for load and wear characteristics of the engine. The ECM processes information from various sensors. The MEMS ECM has the following features:

  1. Variable timing Ignition system.
  2. Variable Multi-port fuel injection system.
  3. Variable Engine Cooling Control
  4. Security (Engine Immobilisation)
  5. ODB Diagnostics

Electronic Diesel Control (EDC) (L SERIES ONLY)

Electronic Diesel Control (EDC) is controlled by a Bosch or Rover ECM. The ECM incorporates short circuit protection and can store intermittent faults on certain inputs.

Power Supplies

The Rover 400 Series electrical system is a standard Negative earth supply- side switched system, with various star points around the vehicle providing ground connections. Power and logic systems are not separately grounded, however a number of components use individual ground points.

As normal much of the electrical power for the car is routed via the ignition switch. Power supplies throughout the car are provided by:-

  • Direct battery power supply.
  • Ignition switched power.

The Electrical systems are protected by fuses mounted in two fuse boxes; one in the engine compartment and the other in the drivers foot well (RH Drive). In addition, individual fuse holders may be mounted on the left hand side of the engine compartment; a 50A fuse - ABS, Diesel glow plugs (models with 3 glow plugs), Air conditioning or 40A and 20A fuses on D series models. Diesel models with 4 glow plugs have a 60A fuse.

Batteries are located under the bonnet(hood) at the LH side or toward the rear.


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