LR3/Disco 3
GENERAL
The V8 4.4 Liter engine is controlled by a Engine Control Module (ECM) manufactured by DENSO. The Engine
Management System (EMS) controls the following:
Engine fuelling
Ignition timing
Closed loop fuelling
Knock control
Idle speed control
Emission control
On Board Diagnostic
Interface with the immobilisation system
Speed control
The ECM controls the engine fuelling by providing sequential fuel injection to all cylinders. Ignition is controlled by a direct
ignition system, provided by eight plug top coils. The ECM is able to detect and correct for ignition knock on each cylinder
and adjust the ignition timing for each cylinder to achieve optimum performance.
The ECM uses a torque-based strategy to generate the torque required by the driver and other vehicle ECU's. The EMS
uses various sensors to determine the torque required from the engine. The EMS also interfaces with other vehicle
electronic control modules's, via the CAN bus, to obtain additional information (e.g. road speed from the ABS control
module). The EMS processes these signals and decides how much torque to generate. Torque is then generated by
using various actuators to supply air, fuel and spark to the engine (electronic throttle, injectors, coils, etc.).
ENGINE CONTROL MODULE (ECM)
The ECM is located in the E-Box in the plenum area on the LH side of the engine compartment attached to the bulkhead.
System ECM has the following inputs:
Engine fuelling
Ignition timing
Closed loop fuelling
Knock control
11
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ATC control module
12
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UHEGO
13
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Ignition coils
14
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HEGO
15
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Generator
16
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ECM
17
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EGR valve
18
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Clock spring
19
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Speed control switches
20
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Electric throttle
