Engine Control Module: Application and ID

Introduction
Three variations of similar Lucas engine management systems have been used on Land Rover vehicles from 1987 to selected 1995 models. Operation of each of these systems is fundamentally the same, the differences between each being enhancements to self diagnostics, improved adaptability to operating conditions, and additional input/output capability. All of these systems utilize a Engine Control Module, and all are tied to vehicle inputs and outputs through a similar 40 pin connector.

The systems used are:
- 13 CU (1987-88)
- 14 CU (1989)
- 14 CUX (1990-95)

The system control modules are mounted under the passenger seat on 1987-1994 vehicles. The module is moved to a position just behind the glove box on 1995 models.

The ECM works with system inputs and outputs to deliver the best possible combination of engine performance and economy while minimizing vehicle emissions.

14CU and 14CUX



The 14CU and 14CUX modules include additional inputs and output controls for more precise control of the air-fuel mixture and enhanced self-diagnostic capabilities.

The following are ECM inputs:
- Key on
- Battery voltage
- Throttle Position Sensor (TPS)
- Engine speed
- Engine Fuel Temperature (EFT) sensor
- Engine Coolant Temperature Sensor (ECT)
- Heated Front Screen
- Heated Oxygen Sensor (HO2S)
- Mass Air Flow Sensor (MAF)
- Vehicle Speed Sensor (VSS)
- Park/Neutral Position Switch (PNPS)
- Air Conditioning Fan Switch (14CU only)
- Air Conditioning Thermostat

The ECM outputs are as follows:
- Fuel Injectors
- Idle Air Control Valve (IACV)
- Purge Valve (CANPV)
- A/C Compressor Clutch
- A/C Condenser Fan Control Module (FCM)
- Malfunction Indicator Lamp (MIL)
- Fuel Pump/ Oxygen Sensor Heaters Relay
- Main relay
- Fault Code Display Unit (14CUX only)