General information
The fuel system consists of: installed in the rear of the vehicle (under the rear seat cushion) fuel tank with activated carbon adsorber, fuel lines, electric fuel pump, and electronic sequential injection system controlled by the control unit.
The fuel reserve is shown to the driver on the instrument panel. In a gasoline engine, gasoline vapors are collected in the adsorber and fed into the combustion chambers of the engine.
Driving style has a significant impact on fuel consumption. Below are some tips on how to use the gas pedal wisely.
- Once the engine starts, move off immediately, even if it is in freezing temperatures;
- If the vehicle is stopped for more than 40 seconds, turn off the engine;
- Always drive in the highest possible gear;
- When driving long distances, maintain a steady speed whenever possible. Avoid driving at high speeds. Drive carefully. Do not brake unnecessarily;
- Do not carry unnecessary loads on the vehicle. If the luggage rack is not in use, remove it from the roof;
- Check the air pressure in your tires. Do not allow the pressure to drop too much.
Functional diagrams of injection systems, vacuum connection diagrams and the location of engine management system components
Functional diagram of the injection system of engines 119 and 104 (engine 119 shown)
40 - Diaphragm pressure regulator; 55 - Fuel filter; 60 - Vacuum device; 74 - Fuel cooler; 75 - Fuel tank; 76 - Ventilation valve; 77 - Carbon adsorber of gasoline vapors; 89 - EGR valve (left on engine 120); 89a - Right EGR valve on engine 120; 98 - Pneumatic damper device for switching to overdrive; 125 - Air pump; 126 - Exhaust manifold air mixing cut-off valve; 127 - Check valve for mixing air into the exhaust manifold (left on engine 120); 127a - Check valve for mixing air into the right, on engine 120, exhaust manifold; 128 - Check valve (underpressure); 135 - Check valve (creating a vacuum); 136 - Vacuum chamber; 156 - Exhaust manifold; 158 - Catalytic converter; A1e26 - Malfunction Indicator Lamp (MIL/ "Check Engine"); A9 - Compressor K/V; A16 - Knock Sensors (KS); A16g1 - Left knock sensor KS; A16g2 - Right knock sensor KS; B2/2, B2/3 - Thermometric air mass sensor (MAF); B11/2 - 4-pin coolant temperature sensor (ECT); B11/7 - Intake air temperature sensor (IAT); B11/9 - Left ECT sensor; B17/5 - Left IAT sensor on engine 120; B17/6 - Right IAT sensor on engine 120; B17/7 - Intake air temperature sensor (IAT); G3/2 - Heated lambda probe (left on engine 120); G3/4 - Right heated lambda probe on engine 120; K17 - Relay for air mixing system in the exhaust manifold; K27 - Fuel pump relay; K27/1 - Left relay for fuel pumps 1 and 2 on engine 120; K27/2 - Right relay for fuel pumps 1 and 2 on engine 120; L5 - Crankshaft Position Sensor (CKP); L5/1 - Camshaft Position Sensor (CMP); L5/2 - Left CMP sensor on engine 120; L5/3 - Right CMP sensor on engine 120; L5/4 - Left CKP sensor on engine 120; L5/5 - Right CKP sensor on engine 120; M3m1 - Fuel pump 1; M3m² - Fuel pump 2; M16/1 - Acceleration actuator (throttle actuator); M16/3 - Left throttle actuator on engine 120; M16/4 - Right throttle actuator on engine 120; N1/3 - Ignition system control unit EZL/AKR; N1/4 - Left ignition system control unit on engine 120; N1/5 - Right ignition control unit on engine 120; N3/1 - ECM; N3/2 - Left ECM on engine 120; N3/3 - Right ECM on engine 120; N4/1 - Acceleration control unit (throttle actuator); N4/3 - Idle Speed Control (IAC)/Cruise Control Unit; N16/1 - Voltage stabilizer; N59 - Diagnostic module (californian models)
Functional diagram of the injection system of the 120 engine
R16/2 - Ignition module reference resistor; R16/3 - Reference resistor of the left ignition module on the 120 engine; R16/4 - Reference resistor of the right ignition module on the 120 engine; S29/3 - Idle speed limit switch; S40 - Cruise control switch; A - Off; B - Overclocking/installation; SP - Reinstallation; V - Engine braking/installation; S65 - Transmission Overload Safety Switch (band brake B1); S65/1 - Transmission overload safety switch (band brake B21). Engine 120; T1 - Ignition coil; T1/1 - Ignition coil of the right cylinder head on the 120 engine; T1/2 - Ignition coil of the left cylinder head on the 120 engine; Y3/3 - Pneumatic valve for upshift damper; Y27 - EGR changeover valve; Y27/2 - Left EGR switch on engine 120; Y27/3 - Right EGR switch on engine 120; Y32 - Exhaust manifold air mixing pump changeover valve; Y33 - Electromagnetic clutch for air mixing pump in exhaust manifold; Y49 - Camshaft Adjuster Solenoid Valve; Y49/1 - Left cylinder head camshaft adjuster solenoid valve on engine 120; Y49/2 - Solenoid valve for camshaft adjuster of right cylinder head on engine 120; Y58/1 - Carbon adsorber pneumatic switch; Y58/2 - Left pneumatic switch of the carbon adsorber on the 120 engine; Y58/3 - Right pneumatic switch of the carbon adsorber on the 120 engine; Y62 - Fuel Injectors (left bank of cylinders on engine 120); Y63 - Fuel injectors right bank of cylinders on engine 120
Vacuum line layout diagram (engines 104)
1 - Vacuum receiver; 2 - Vacuum distributor; 3 - Resonant damper; 4 - Air cut-off valve (with built-in check valve); 5 - Electric vacuum pump; 6 - Air pump switch valve; 7 - Vacuum control valve; 8 - Diaphragm pressure regulator; 9 - Manifold Absolute Pressure (MAP) Sensor; 10 - Purge control valve; 11 - To the carbon adsorber; 12 - Throttle actuator
Vacuum line layout diagram (engines 119)
1 - Vacuum receiver; 2 - Vacuum supply control valve; 3 - Diaphragm pressure regulator; 4 - Purge control valve; 5 - To the ME-SFI injection system control module; 6 - To the carbon adsorber; 7 - Electric air pump; 8 - Air supply shut-off valve; 9 - Manifold Absolute Pressure (MAP) Sensor; 10 - Air pump switch valve
Vacuum and evaporative line connections to the inlet manifold (engines 120)
40 - Diaphragm pressure regulator; 125 - Air pump; 126 - Air cut-off valve; 126a - Right air cut-off valve; 127 - Left check valve (air mixing); 128 - Vacuum control valve; 135 - Vacuum supply line check valve; 136 - Vacuum receiver; M16/3 - Left actuator of electronic accelerator/crankcase speed control/idle speed control device. On the left side of the power unit; M16/4 - Right electronic accelerator/crankcase speed control/idle speed control device actuator. On the right side of the power unit; Y32 - Air pump switch valve; Y33 - Air pump electromagnetic clutch; Y58/2 - Left purge control valve; Y58/3 - Right purge control valve; a - to the carbon adsorber; rt - red; gr - gray; sw - black; tr - neutral
The injector for the first cylinder is located in the right front part of the power unit (using a 12-cylinder engine as an example).
The fuel pump assembly is located underneath the vehicle, forward of the right rear axle.
The fuel pump relay is located on the right side of the luggage compartment, behind the rear fuse box.
The fuel gauge is located in the left front corner of the luggage compartment, on the fuel tank.
The intake manifold switching valve is located under the intake manifold (bottom view).
The left thermometric air mass meter (MAF) is placed on the right side of the engine compartment, on the air intake sleeve.
The left coolant temperature sensor is located on the left front of the power unit.
The right coolant temperature sensor is located on the left front of the power unit.
The coolant temperature (ECT) sensor is located on the upper left front corner of the powertrain.
The left knock sensor (KS) is located in a recess on top of the engine (in the picture the engine is removed from the car).
The left knock sensor (KS) 1 is located in a recess on top of the engine (in the picture the engine is removed from the car).
The left crankshaft position sensor (CKP) on a V12 engine is located on the right side of the rear wall of the engine block.(in the picture the engine is removed from the car)
Right crankshaft position sensor (CKP) on V12 engine - rear on top of cylinder block (the engine is removed from the car).
Left pre-catalytic lambda probe 1 - under the car, close to the DP, above the catalytic converter.
Pre-catalytic lambda probe 1 - under the car, close to the DP, on the tubular section of the exhaust system, in front of the catalytic converter.
Left post-catalytic lambda probe 2 - under the car, near the DP.
Post-catalytic lambda probe 2 - under the car, near the DP under the rear seat, in the exhaust pipe behind the catalytic converter.
The electromagnetic clutch of the air mixing pump is located at the bottom in the right front corner of the engine compartment.
The right purge valve of the adsorber is located on the left side of the engine compartment, on the mudguard of the wheel arch.
The left purge valve of the adsorber is located on the right side of the engine compartment, on the mudguard of the wheel arch, behind the expansion tank of the cooling system.
The purge valve for the adsorber is located in the left front corner of the engine compartment, on the wheel arch mudguard.
The purge shut-off valve for the adsorber is located under the car, at the rear of the left rear wheel arch.