Fuel system MFi of car Land Rover Discovery 1
MFI Fuel System Description
In the fuel system (injection system) MFI uses a hot-wire air flow sensor. The control unit, based on sensor signals, calculates the fuel supply depending on the engine speed and load conditions....
In the fuel system (injection system) MFI uses a hot-wire air flow sensor. The control unit, based on sensor signals, calculates the fuel supply depending on the engine speed and load conditions....
Troubleshooting
All V8i engines require the TESTBOOK diagnostic tester to diagnose the control system. Before connecting the tester, perform the following preliminary checks: 1. Check the condition of the inertia...
All V8i engines require the TESTBOOK diagnostic tester to diagnose the control system. Before connecting the tester, perform the following preliminary checks: 1. Check the condition of the inertia...
Checking injectors
Note: Before removing the injectors, unscrew the spark plugs; the presence of soot deposits on the spark plug insulator indicates that the injector for that cylinder is faulty. Location of injection...
Note: Before removing the injectors, unscrew the spark plugs; the presence of soot deposits on the spark plug insulator indicates that the injector for that cylinder is faulty. Location of injection...
Adjusting the installation speed
Note: This adjustment is only required after replacing the resonance chamber. The adjustment screws are sealed and cannot be accessed by the vehicle user. Before starting the adjustment, check the...
Note: This adjustment is only required after replacing the resonance chamber. The adjustment screws are sealed and cannot be accessed by the vehicle user. Before starting the adjustment, check the...
Checking fuel pressure
Attention: Observe fire safety precautions. Before starting the test, relieve any residual pressure in the fuel system. 1. Remove the fuel pump relay. 2. Start the engine. 3. After the engine stalls,...
Attention: Observe fire safety precautions. Before starting the test, relieve any residual pressure in the fuel system. 1. Remove the fuel pump relay. 2. Start the engine. 3. After the engine stalls,...
Accelerator cable (adjustment)
1. Loosen the cable sheath adjustment nuts. 2. Move the throttle lever to the fully closed position. 3. Adjust the position of the braid until the cable deflection is 1.5 mm (dimension A). 4. Check...
1. Loosen the cable sheath adjustment nuts. 2. Move the throttle lever to the fully closed position. 3. Adjust the position of the braid until the cable deflection is 1.5 mm (dimension A). 4. Check...
Repair — Air Filter Assembly
Shown is the 3.9 V8 engine. 1. Disconnect the two clips securing the filter to the air flow sensor. 2. 3.9 V8: Disconnect the ventilation hose. 4.0 V8: Disconnect the air temperature sensor...
Shown is the 3.9 V8 engine. 1. Disconnect the two clips securing the filter to the air flow sensor. 2. 3.9 V8: Disconnect the ventilation hose. 4.0 V8: Disconnect the air temperature sensor...
Replacing the filter element
1. Remove the 4 air cleaner cover clips. 2. Disconnect the 2 filter clips from the air flow sensor. 3. Remove the cover and sealing ring. 4. Remove the filter element. 5. Install the new filter...
1. Remove the 4 air cleaner cover clips. 2. Disconnect the 2 filter clips from the air flow sensor. 3. Remove the cover and sealing ring. 4. Remove the filter element. 5. Install the new filter...
Air flow sensor
Note: the sensor cannot be repaired and must be replaced. 1. Disconnect the battery. 2. Disconnect the resonance chamber hose from the sensor. 3. Disconnect the sensor connector. 4. Disconnect the...
Note: the sensor cannot be repaired and must be replaced. 1. Disconnect the battery. 2. Disconnect the resonance chamber hose from the sensor. 3. Disconnect the sensor connector. 4. Disconnect the...
Throttle position sensor
1. Disconnect the battery. 2. Disconnect the sensor connector. 3. Loosen the two screws securing the sensor to the resonance chamber and carefully pull out the sensor. 4. Remove the sensor gasket and...
1. Disconnect the battery. 2. Disconnect the sensor connector. 3. Loosen the two screws securing the sensor to the resonance chamber and carefully pull out the sensor. 4. Remove the sensor gasket and...
Idle air control valve
1. Disconnect the battery. 2. Disconnect the valve connector. 3. Unscrew the bolts securing the valve to the resonance chamber and remove the valve. 4. Replace the sealing washer. 5. Clean the...
1. Disconnect the battery. 2. Disconnect the valve connector. 3. Unscrew the bolts securing the valve to the resonance chamber and remove the valve. 4. Replace the sealing washer. 5. Clean the...
Vehicle speed sensor
The sensor is installed on the left side of the transfer case. 1. Disconnect the battery. 2. Apply the parking brake and raise the car on the lift. 3. Disconnect the speed sensor connector. 4. Loosen...
The sensor is installed on the left side of the transfer case. 1. Disconnect the battery. 2. Apply the parking brake and raise the car on the lift. 3. Disconnect the speed sensor connector. 4. Loosen...
Injection system relay
The relays are located at the bottom of the right A-pillar: Fuel Pump Relay (A) - Blue Base. Main relay (B) - black base. 1. Remove the door seal from the A-pillar. 2. Remove the lower trim panel of...
The relays are located at the bottom of the right A-pillar: Fuel Pump Relay (A) - Blue Base. Main relay (B) - black base. 1. Remove the door seal from the A-pillar. 2. Remove the lower trim panel of...
Engine control unit (14 CUX)
Note: The control unit cannot be repaired. 1. Remove the right front panel hatch. 2. Remove the trim panel in the footwell. 3. Disconnect the battery. 4. Disconnect the control unit connector...
Note: The control unit cannot be repaired. 1. Remove the right front panel hatch. 2. Remove the trim panel in the footwell. 3. Disconnect the battery. 4. Disconnect the control unit connector...
Inertia switch
The switch is installed on the engine compartment bulkhead behind the washer reservoir. 1. Disconnect the battery. 2. Disconnect the switch connector. 3. Unscrew the two screws securing the switch....
The switch is installed on the engine compartment bulkhead behind the washer reservoir. 1. Disconnect the battery. 2. Disconnect the switch connector. 3. Unscrew the two screws securing the switch....
Fuel temperature sensor
1. Relieve residual fuel pressure in the system, disconnect the battery. 2. Disconnect the sensor connector. 3. Remove the sensor from the fuel rail. 4. Installation is carried out in reverse order.
1. Relieve residual fuel pressure in the system, disconnect the battery. 2. Disconnect the sensor connector. 3. Remove the sensor from the fuel rail. 4. Installation is carried out in reverse order.
Coolant temperature sensor
1. Place a container under the sensor to collect the liquid. 2. Disconnect the sensor connector. 3. Remove the sensor from the thermostat housing. 4. Discard the sealing washer. 5. Installation is...
1. Place a container under the sensor to collect the liquid. 2. Disconnect the sensor connector. 3. Remove the sensor from the thermostat housing. 4. Discard the sealing washer. 5. Installation is...
Fuel pressure regulator
1. Relieve residual fuel pressure. 2. Disconnect the battery. 3. Remove the resonance chamber. 4. Disconnect the return fuel line from the regulator. 5. Disconnect the vacuum hose from the regulator....
1. Relieve residual fuel pressure. 2. Disconnect the battery. 3. Remove the resonance chamber. 4. Disconnect the return fuel line from the regulator. 5. Disconnect the vacuum hose from the regulator....
Fuel manifold (right and left)
Removal 1. Relieve residual fuel pressure 2. Disconnect the battery. 3. Remove the resonance chamber. 4. Remove the Ventura nozzle housing. Plug the intake channels with a rag. 5. Disconnect the fuel...
Removal 1. Relieve residual fuel pressure 2. Disconnect the battery. 3. Remove the resonance chamber. 4. Remove the Ventura nozzle housing. Plug the intake channels with a rag. 5. Disconnect the fuel...
Resonance chamber (with throttle lever and throttle valve)
Removal 1. Disconnect the battery. 2. Disconnect the idle air control valve connector. 3. Disconnect the vacuum hose located next to the valve. 4. Mark the position of the accelerator cable adjusting...
Removal 1. Disconnect the battery. 2. Disconnect the idle air control valve connector. 3. Disconnect the vacuum hose located next to the valve. 4. Mark the position of the accelerator cable adjusting...
Venturi nozzle housing
Removal 1. Disconnect the battery. 2. Remove the resonance chamber. 3. Disconnect the hoses from the nozzle body. 4. Unscrew the six bolts securing the nozzle housing to the intake manifold. 5....
Removal 1. Disconnect the battery. 2. Remove the resonance chamber. 3. Disconnect the hoses from the nozzle body. 4. Unscrew the six bolts securing the nozzle housing to the intake manifold. 5....
Intake manifold
Removal 1. Relieve residual fuel pressure. 2. Disconnect the battery. 3. Drain the coolant. 4. Remove the resonance chamber. 5. Remove the Venturi nozzle housing. 6. Disconnect the fuel temperature...
Removal 1. Relieve residual fuel pressure. 2. Disconnect the battery. 3. Drain the coolant. 4. Remove the resonance chamber. 5. Remove the Venturi nozzle housing. 6. Disconnect the fuel temperature...
Fuel filter
Note: Observe fire safety precautions. 1. Relieve residual pressure in the fuel system. 2. Access to the filter is through the right rear wheel arch. 3. Clean any dirt from the places where the fuel...
Note: Observe fire safety precautions. 1. Relieve residual pressure in the fuel system. 2. Access to the filter is through the right rear wheel arch. 3. Clean any dirt from the places where the fuel...
Accelerator cable
Removal 1. Remove the cotter pin securing the cable to the throttle lever. 2. Carefully remove the adjustment assembly from the bracket. 3. Remove the cable from the bracket. 4. Disconnect the cable...
Removal 1. Remove the cotter pin securing the cable to the throttle lever. 2. Carefully remove the adjustment assembly from the bracket. 3. Remove the cable from the bracket. 4. Disconnect the cable...
Accelerator pedal
1. Remove the lower trim panel. 2. Disconnect the accelerator cable 3. Disconnect the return spring. 4. Remove the pedal axle retaining ring. Note: You may need to lower the steering column to access...
1. Remove the lower trim panel. 2. Disconnect the accelerator cable 3. Disconnect the return spring. 4. Remove the pedal axle retaining ring. Note: You may need to lower the steering column to access...
Fuel pump and fuel level sensor
Access to the pump is through a hatch in the rear of the cabin floor. Before removing the pump, clean the place where it is connected. Observe fire safety measures. To remove the pump you will need...
Access to the pump is through a hatch in the rear of the cabin floor. Before removing the pump, clean the place where it is connected. Observe fire safety measures. To remove the pump you will need...
Fuel tank
1. Relieve residual pressure in the fuel system, disconnect the battery. 2. Drain the fuel tank completely. 3. Remove the carpet in the cargo area of the passenger compartment. 4. Remove the sound...
1. Relieve residual pressure in the fuel system, disconnect the battery. 2. Drain the fuel tank completely. 3. Remove the carpet in the cargo area of the passenger compartment. 4. Remove the sound...
Tightening torques for threaded connections (Nm)
Valve (stepper motor) idle speed adjustment - 20 Fuel line nuts - 22 Fuel filter - 31 Hose clamp screws - 1.5
Valve (stepper motor) idle speed adjustment - 20 Fuel line nuts - 22 Fuel filter - 31 Hose clamp screws - 1.5
Special tool
Fuel Pressure Gauge and Hoses - LRT-19-004 18G 500 Fuel System Test Adapter Hose Kit - MFI LRT-19-003 LST 143 Connector Release Key - LRT-19-002 LST 144 Fuel Pump Removal Tool - LRT-19-001 LST 131
Fuel Pressure Gauge and Hoses - LRT-19-004 18G 500 Fuel System Test Adapter Hose Kit - MFI LRT-19-003 LST 143 Connector Release Key - LRT-19-002 LST 144 Fuel Pump Removal Tool - LRT-19-001 LST 131
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