Defender. Manual — part 142
Electronic Engine Controls - 2.4L Duratorq-TDCi HPCR (103kW/140PS) -
Puma -
Torque Specifications
Item
Nm
lb-ft
Crankshaft position (CKP) sensor
7
5
Camshaft position (CMP) sensor
9
7
Cylinder head temperature (CHT) sensor
10
7
Manifold absolute pressure and temperature (MAPT) sensor
3
2
Engine oil pressure (EOP) sensor
15
11
Engine control module (ECM)
10
7
Electronic Engine Controls - 2.4L Duratorq-TDCi HPCR (103kW/140PS) -
Puma - Electronic Engine Controls
Description and Operation
COMPONENT LOCATION SHEET 1
Item
Part Number
Description
1
-
engine control module (ECM)
2
-
Fuel pressure sensor
3
-
Pressure limiting valve
4
-
Injectors
5
-
camshaft position (CMP) sensor
6
-
Glow plugs
7
-
exhaust gas recirculation (EGR) valve
8
-
manifold absolute pressure (MAP) sensor
9
-
Oil pressure switch
10
-
Fuel pump
11
-
mass air flow (MAF)/intake air temperature (IAT) sensor
12
-
crankshaft position (CKP) sensor
13
-
cylinder head temperature (CHT) sensor
COMPONENT LOCATION SHEET 2
Item
Part Number
Description
1
-
Brake pedal switch
2
-
accelerator pedal position (APP) sensor
3
-
battery junction box (BJB)
4
-
central junction box (CJB)
5
-
Clutch switch
OVERVIEW
The engine management system is controlled by an ECM and is able to monitor, adapt and precisely control the fuel
injection. The ECM uses multiple sensor inputs and precision control of actuators to achieve optimum performance
during all driving conditions.
The ECM controls fuel delivery to all 4 cylinders via a Common Rail (CR) injection system. The CR system uses a fuel
rail to accumulate highly pressurized fuel and feed the 4, electronically controlled injectors. The fuel rail is located in
close proximity to the injectors, which assists in maintaining full system pressure at each injector at all times.
The ECM uses the drive by wire principle for acceleration control. There are no control cables or physical connections
between the accelerator pedal and the engine. Accelerator pedal demand is communicated to the ECM by two
potentiometers located in an APP sensor. The ECM uses the two signals to determine the position, rate of movement and
direction of movement of the pedal. The ECM then uses this data, along with other engine information from other
sensors, to achieve the optimum engine response.
The ECM processes information from the following input sources:
CKP sensor
CMP sensor
Manifold air temperature and pressure
Cylinder head temperature
Oil pressure
Inlet air flow and temperature
Fuel temperature
The ECM outputs controlling signals to the following sensors and actuators:
Fuel injectors
Cooling fan solenoid
Electric vane controlled turbo
Fuel pressure control valve
Fuel volume control valve
Electronic EGR
Glow plugs
ECM
Item
Part Number
Description
C1
-
Connector 1
C2
-
Connector 2
C3
-
Connector 3
The ECM connected to the vehicle harnesses via three connectors. The ECM contains data processors and memory
microchips. The output signals to the actuators are in the form of ground paths provided by driver circuits within the
ECM. The ECM driver circuits produce heat during normal operation and dissipate this heat via the casing. Some sensors
receive a regulated voltage supplied by the ECM. This avoids incorrect signals caused by voltage drop during cranking.
The ECM performs self diagnostic routines and stores fault codes in its memory. These fault codes and diagnostics can
be accessed using the Land Rover recommended diagnostic tool. If the ECM is to be replaced, the new ECM is supplied
'blank' and must be configured to the vehicle using the Land Rover recommended diagnostic tool. A 'flash' electrically
erasable programmable read only memory (EEPROM) allows the ECM to be externally configured, using the Land Rover
recommended diagnostic tool, with market specific or new tune information up to 14 times. If a fifteenth update is
required the ECM must be replaced. The current engine tune data can be accessed and read using the Land Rover
recommended diagnostic tool.
When a new ECM is fitted, it must also be synchronized to the immobilization control module using the Land Rover
recommended diagnostic tool. ECM's cannot be 'swapped' between vehicles.
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