Generic Engine Management System

GENERIC ENGINE MANAGEMENT SYSTEM

Land Rover moves into the next level of sophistication in engine management with the new Generic Engine Management System (GEMS). GEMS incorporates the function of the distributor into the ECM to provide a computer-controlled Distributorless Ignition System (DIS).

GEMS also provides more precise fuel delivery through the use of adaptive operating software and Sequential Multiport Fuel Injection. More sophisticated OBD II diagnostic capabilities are also included as part of the package.

New default strategies have been incorporated into the GEMS to allow the vehicle to continue running in the event of sensor failure - sometimes without any apparent symptoms other than an illuminated Malfunction Indicator Lamp (MIL). What is occurring, however, is a real reduction in vehicle performance, economy, or emissions system operation.

The ECM is mounted in the engine compartment. The expanded list of ECM inputs is as follows:

- Crankshaft Position (CKP) Sensor
- Ignition Signal (Key ON signal)
- Camshaft Position (CMP) Sensor
- Knock Sensor (KS)
- Intake Air Temperature Sensor (IAT)
- Engine Coolant Temperature (ECT) Sensor
- Engine Fuel Temperature (EFT) Sensor
- Throttle Position Sensor (TPS)
- Mass Air Flow Sensor (MAF)
- Park/Neutral Position Switch (PNPS)
- 4 Heated Oxygen Sensors (H02S)
- Fuel Level Sensor
- Heated Front Screen
- Vehicle Speed Sensor (VSS)
- Air Conditioning request
- Battery Voltage
- Cooling fan request
- Security link
- ABS link

Several of these inputs (vehicle speed, A/C request) originate in the ABS Module and are received via the Body Control Module.

System outputs are as follows:

- A/C Compressor Clutch
- Fan Control
- Fuel Injectors
- Idle Air Control Valve (IAC)
- Purge Valve
- Malfunction Indicator Lamp (MIL)
- Fuel Pump Relay
- Main Relay
- Ignition Coil Driver