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Home >> Jaguar >> 1990 >> Sovereign L6-4.0L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Description and Operation >> Engine Management System
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Engine Management System

Overview
The AJ6 4.0 Litre EMS is an integrated engine management system, controlled through a digital Electronic Control Module (ECM) containing a microprocessor.

The system maintains optimum performance over the engine operating range by precisely controlling fuel injection, ignition timing and emission control functions. In addition, the ECM provides various interface outputs and incorporates an on-board diagnostic function.

Function And Control - Summary:
- Fuel delivery (fuel pump)
- Evaporative emission control (canister purge)
- Fuel injection
- Cold start
- Warm-up
- Exhaust emission
- Oxygen sensor feedback
- Overrun fuel cut-off
- RPM limitation (engine overspeed)
- Wide-open-throttle fuel cut-off
- Ignition timing
- Idle speed control
- Air injection
- Exhaust gas recirculation
- Adaptive idle fuel metering (1993 MY ON)
- On-Board Diagnostics (OBD)
- "Limp home" capability
- Vehicle systems interfaces
- Serial communication (IS0)





Typical AJ6 4.0 Litre EMS

Components Locations:





EMS Components Installed on Engine

Components Locations:





EMS Components Installed on Vehicle



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