Fuel system — general information (Mazda 6 GG)

Mazda 6 (GG) cars are equipped with new L-series engines. The features of the L-series engines are listed below:

The local area network of the CAN controller is used.
A mechanical fuel system is used without fuel return to the tank.
An intake manifold management system is used to improve engine performance in the high-speed range (l3 engine).
The variable valve timing system is used to improve engine performance (l3 engine).
A variable intake system is used to increase engine torque and combustion efficiency (l3 engine).
The fuel injection control system performs correction based on the absolute pressure in the intake manifold.
The system has a non-adjustable ignition timing angle.
All fuel line connections are equipped with quick-release connectors.
The KOEO/KOER self-diagnosis function is used.
The process of storing raw codes has been changed.
The MIL indicator operating mode has been changed for the second type of driving cycle.

Fig. 2.53. Diagram of the fuel system control system of the Mazda 6 car: 1 – PCM block; 2 – ignition coil; 3 – generator; 4* – VAD system damper; 5 – air filter; 6 – mass air flow sensor; 7* – actuator of the VAD system damper; 8* – VAD system control solenoid valve; 9* – vacuum chamber; 10* – VAD system check valve; 11 – idle speed control; 12 – purge electromagnetic valve; 13 – throttle position sensor; 14 – absolute pressure sensor; 15* – VIS system control solenoid valve; 16 – Variable tumble control solenoid valve; 17* – actuator of the VIS system damper; 18* – VIS system valve; 19 – actuator of the VTCS valve; 20 – VTCS valve; 21 – fuel injector; 22* – control oil valve; 23 – camshaft position sensor; 24 – exhaust gas recirculation valve; 25 – knock sensor; 26 – coolant temperature sensor; 27 – crankcase ventilation valve; 28 – crankshaft position sensor; 29 – Heated oxygen concentration sensor (front); 30 – Heated oxygen concentration sensor (rear); 31 – container with activated carbon (adsorber); 32 – check valve (double-sided); 33 – pressure regulator; 34 – fuel filter (high pressure); 35 – fuel pump; 36 – fuel filter (low pressure); 37 – fuel tank; 38 – gravity valve; 39 – pulsation damper; 40 – to the PCM block; Note – *: for L3 engines

Fig. 2.54a. Wiring diagram of the fuel system control system of the Mazda 6 with an immobilizer (part 1)

Fuel management system of the Mazda 6 with immobilizer (fig. 2.54a, 2.54b) contains the following elements: 1 – heated oxygen concentration sensor (front); 2 – heated oxygen concentration sensor (rear); 3 – throttle position sensor; 4 – absolute pressure sensor in the intake manifold; 5 – pressure sensor; 6 – coolant temperature sensor; 7 – Mass air flow/intake air temperature sensor; 8 – intake air temperature sensor; 9 – absolute pressure sensor in the intake manifold; 10 – Controller Area Network (CAN); 11 – knock sensor; 12 – crankshaft position sensor; 13 – camshaft position sensor; 14 – fuel injector No.1; 15 – fuel injector No.2; 16 – fuel injector No.3; 17 – fuel injector No.4; 18 – idle speed control; 19 – Oxygen concentration sensor heater (front); 20 – Oxygen concentration sensor heater (rear); 21 – Air conditioning system relay; 22 – Cooling system fan relay; 23 – Cooling system fan relay; 24 – Cooling system fan relay; 25 – Cooling system fan relay; 26 – fuel pump relay; 27 – spiral; 28 – safety lamp; 29 – ignition switch; 30 – main relay; 31 – L8, LF engines (hot area) and L3; 32 – models with automatic transmission; 33 – models with manual transmission; 34 – generator; 35 – refrigerant pressure sensor (middle); 36 – Power steering pressure sensor; 37 – Fan motor; 38 – refrigerant pressure sensor (high and low); 39 – Air conditioning system switch; 40 – Brake light switch; 41 – neutral switch; 42 – Clutch switch; 43- Gearbox range switch; 44 – turbine speed sensor; 45 – HOLD switch; 46 – TFT sensor; 47 – oil pressure sensor; 48 – vehicle speed sensor; 49 – ignition coil; 50 – generator; 51 – purge electromagnetic valve; 52 – VAD system control solenoid valve; 53 – exhaust gas recirculation valve; 54 – Variable tumble control solenoid valve; 55 – VIS system control solenoid valve; 56 – control oil valve; 57 – valve body; 58 – brake signal; 59 – L8, LF engines (hot area) and L3; 60 – model with manual transmission; 61 – models with automatic transmission; 62 – engine L3

Fig. 2.54b. Wiring diagram of the fuel system control system of the Mazda 6 with an immobilizer (part 2 – continued)

Fig. 2.55a. Wiring diagram of the fuel system control system of a Mazda 6 without an immobilizer (part 1)

Fuel management system of Mazda 6 car without immobilizer (fig. 2.55a, 2.55b) contains the following elements: 1 – heated oxygen concentration sensor (front); 2 – heated oxygen concentration sensor (rear); 3 – throttle position sensor; 4 – absolute pressure sensor in the intake manifold; 5 – pressure sensor; 6 – coolant temperature sensor; 7 – Mass air flow/intake air temperature sensor; 8 – intake air temperature sensor; 9 – absolute pressure sensor in the intake manifold; 10 – Controller Area Network (CAN); 11 – knock sensor; 12 – crankshaft position sensor; 13 – camshaft position sensor; 14 – fuel injector No.1; 15 – fuel injector No.2; 16 – fuel injector No.3; 17 – fuel injector No.4; 18 – idle speed control; 19 – Oxygen concentration sensor heater (front); 20 – Oxygen concentration sensor heater (rear); 21 – Air conditioning system relay; 22 – Cooling system fan relay; 23 – Cooling system fan relay; 24 – Cooling system fan relay; 25 – Cooling system fan relay; 26 – fuel pump relay; 27 – ignition switch; 28 – main relay; 29 – L8, LF engines (hot area) and L3; 30 – models with automatic transmission; 31 – generator; 32 – refrigerant pressure sensor (middle); 33 – Power steering pressure sensor; 34 – fan motor; 35 – refrigerant pressure sensor (high and low); 36 – Air conditioning system switch; 37 – Brake light switch; 38 – brake signal; 39 – neutral switch; 40 – clutch switch; 41 – Gearbox range switch; 42 – Input/Turbine Speed Sensor; 43 – HOLD switch; 44 – TFT sensor; 45 – oil pressure sensor; 46 – vehicle speed sensor; 47 – oil pressure sensor; 48 – vehicle speed sensor; 48 – generator; 49 – purge electromagnetic valve; 50 – VAD system control solenoid valve; 51 – exhaust gas recirculation valve; 52 – Variable tumble control solenoid valve; 53 – VIS system control solenoid valve; 54 – oil control valve; 55 – valve body; 56 – L8, LF engines (hot area) and L3; 57 – models with manual transmission; 58 – models with automatic transmission; 59 – L3 engine.