Fuel injection system car Toyota Carina 6 (T190)

Fuel injection system — general information
The injection system consists of three main subsystems: fuel, air supply and electronic control.

Fuel system
Fuel is supplied by the fuel pump through the fuel filter to each injector under pressure set by the fuel pressure regulator. The fuel pressure regulator provides a differential fuel pressure between the fuel and intake...

Air supply system
The air supply system provides the amount of air required for engine operation. The amount of air entering the engine is determined by the throttle opening angle and the engine crankshaft speed. The air flow passes the...

Electronic control system
All engines are equipped with TOYOTA electronic control system, which controls fuel injection, ignition timing, idle speed, diagnostic system, etc. using an electronic control unit with a microcomputer. The following...

Precautions when servicing electrical equipment
1. Check that the engine settings are correct (see chapter " Maintenance and general check and adjustment procedures "). 2. Precautions when connecting devices. a) Use the battery as a power source for the stroboscope,...

Precautions to take when using a mobile radio communication system in your vehicle
The electronic control unit is designed in such a way as to exclude the influence of external electromagnetic interference. However, if the vehicle is equipped with a CB radio, etc. (even with an output power of only 10...

Precautions when working with the air supply system
1. Removing the dipstick, oil filler cap, hoses, etc. from the engine may cause engine adjustments to be out of adjustment. 2. Disconnection, loosening of fasteners or cracking of air supply system components (between...

Precautions when working with an electronic control system
1. Before disconnecting the electrical connectors of the electronic control unit, it is necessary to disconnect the electrical power either by using the ignition key or by removing the terminals from the battery....

Precautions when working with the fuel system
1. Before working on the fuel system, disconnect the negative cable from the battery. Caution: Any diagnostic code in the electronic control unit memory is erased when the (-) negative terminal is removed from the...

Diagnostic system — description
The electronic control unit has a built-in system of current self-diagnostics, which continuously monitors the engine condition using sensor signals. If a malfunction is detected, this system identifies it and informs...

Engine malfunction indicator lamp («CHECK»)
1. The "CHECK" indicator lamp is a warning light signal, which is a light panel on the instrument panel, lights up when the ignition is on and the engine is not running. 2. After starting the engine, the "CHECK"...

Output of diagnostic codes
Attention. During diagnostics, two main modes are used: current self-diagnosis and testing. Current self-diagnosis mode To obtain the output diagnostic code, the following procedures must be performed. 1. Check the...

Diagnostic indication
1. If 2 or more types of faults appear at the same time, then the code with the lowest number is displayed first, and then as the numbers increase. 2. All fault codes recorded during the driving cycle, except those...

Clear diagnostic code
1. After repairing the faulty unit, the diagnostic code is stored in the memory of the electronic control unit. Therefore, it must be deleted (erased) by disconnecting the "EFI" fuse (with ignition off). Time of...

Checking the diagnostic system circuit
Troubleshooting with a Volt/Ohmmeter Attention: - Each system has its own troubleshooting procedures, which are described in this manual. These procedures may change slightly from time to time. However, the methods...

Diagnostic codes for the electronic control unit (3S-FE, 4S-FE, 4A-FE, 5A-FE, 7A-FE)

Electronic control unit outputs
Engines 3S-FE, 4S-FE Engines 4A-FE, 5A-FE, 7A-FE Engines 3S-FE, 4S-FE Engines 4A-FE, 5A-FE, 7A-FE

Checking injection system components using an oscilloscope
Note: Below are the correct waveforms for different engines. №10-20-E1 (5A-FE, 4S-FE) Division value: X - 20 ms, Y - 20 V. Mode: idle. №10-20-E1 (4A-FE, 3S-FE) Division value: X - 20 ms, Y - 20 V. Mode: idle. №10-40-E1...

Some technical data of the electronic control system

Removal and installation the fuel pump
Caution: When performing work on removing and installing fuel system components, disconnect the fuel pump connector in the luggage compartment as shown in the figure. Removal Precautions: Do not smoke or use open flames...

Fuel Pump — Checking on Engine
Check the operation of the fuel pump. Short-circuit the "+B" and "FP" terminals of the diagnostic connector with a jumper. b) Turn on the ignition Warning: Do not start the engine. c) Check for fuel pressure in the hose...

Disassembly and assembly of the fuel pump
Disassembly 1. Remove the fuel pump from the bracket. a) Disconnect the fuel pump wiring from the connector. b) Remove the lower part of the fuel pump from the bracket. c) Remove the rubber shock absorber from the fuel...

Checking the fuel pump
1. Check the resistance of the fuel pump winding. Measure the resistance between the pump terminals using an ohmmeter. Nominal resistance - 0.2-3.0 Ohm If the resistance is outside the specified range, replace the fuel...

Fuel pressure regulator
Serie A 1 - fuel return hose, 2 - vacuum hose, 3 - fuel pressure regulator, 4 - O-ring seal. 3S-FE, 4S-FE 1 - vacuum hose, 2 - fuel pressure regulator, 3 - O-ring seal, 4 - gasket on the engine Checking on the engine...

Removal and installation the fuel tank
1 - service hatch cover, 2 - fuel pump assembly, 3 - gasket, 4 - fuel tank assembly, 5 - fuel vapor recovery system hose, 6 - fuel hose (filling tube), 7 - filling hose, 8 - lower fuel tank protection, 9 - fuel tank...

Fuel filter
4A-FE, 5A-FE 1 - fuel inlet hose, 2 - gasket, 3 - fuel filter. 7A-FE 1 - fuel inlet hose, 2 - fuel filter, 3 - air filter cover with air duct, 4 - gasket. 3S-FE, 4S-FE 1 - air filter cover with air duct, 2 - ABS...

Injectors — checking on the engine
1. Check the functionality of the injectors by ear. a) With the engine running or when turning it over with the starter, use a phonendoscope to check by ear (by the sound of injected fuel) in the performance of the...

Removal and installation injectors
Removal and installation injectors (5A-FE) 1 - rear seat cushion, 2 - fuel pump connector, 3 - air filter cover with air duct, 4 - connector of the intake air temperature sensor, 5 - vacuum hose (fuel vapor...

Checking the injectors
1. Inspect the injectors, use a match to check if there is dirt on the inlet mesh, if there is, blow it out with air. 2. Check the quality of injection by the injectors. Note: Avoid sparking during testing. Keep a fire...

Installation of injectors
1. Install the injectors and fuel manifold. a) Install a new sealing sleeve on the injector (if you filmed). b) Apply a thin layer of fuel (lithol) to the new O-ring and install it on the injector. c) Rotate the...

Removal and installation the throttle body
Series A 1. Disconnect the (-) cable from the negative battery terminal. 2. Drain the coolant from the engine. 3. Disconnect the accelerator cable. 4. (Models with automatic transmission) Disconnect the throttle valve...

Disassembling the throttle body
Series A 1. Remove the idle speed control valve by unscrewing the 4 mounting screws. 2. Remove the throttle position sensor by unscrewing the 2 mounting screws. 3S-FE, 4S-FE 1. Remove the idle speed control valve by...

Checking the throttle position sensor
Series A 1. Check the throttle position sensor. a) (4A-FE with automatic transmission) Apply vacuum to the throttle damper. b) Insert a 0.4 or 0.9 mm thick flat feeler gauge between the throttle stop adjusting screw and...

Installing and adjusting the throttle position sensor
Series A 1. Set the throttle valve to the fully closed position. 2. Install the sensor to the position shown in the figure (90° counterclockwise from the original position), insert it into the throttle body, then turn...

Throttle body structure
Serie A 5A-FE, 7A-FE 4A-FE 1 - fuel vapor accumulator vacuum hose, 2 - vacuum hose, 3 - throttle body, 4 - throttle position sensor, 5 - throttle position sensor connector, 6 - connector of the intake air temperature...

Valve of the idle speed control system
Check on the car 1. Check the resistance of the valve winding. a) Disconnect the valve connector. b) Using an ohmmeter, measure the resistance between the "+B" terminal and the terminals "ISC1", "ISC2" connector....

Fuel injection system main relay
Injection system main relay connection diagrams 1 - battery, 2 - main fuse link 2.0L, 3 - fuse link AM2 (ZOA), 4 - ignition switch, 5 - EFI fuse (15A), 6 - fuse JGN (7.5A), 7 - main relay of the fuel injection system, 8...

Location of components of the electronic control system
Serie A 1 - coolant temperature sensor, 2 - coolant temperature sensor, 3 - nozzles, 4 - frequency control system valve, 5 - absolute pressure sensor in the intake manifold, 6 - throttle position sensor, 7 - oxygen...

Fuel pump relay switch
1. Remove the fuel pump switch relay. 2. Check the relay electrical circuit using an ohmmeter. Measure the resistance between the terminals of the fuel pump switch relay. If the above conditions are not met, replace the...

Coolant temperature sensor and intake air temperature sensor
Checking the coolant temperature and intake air temperature sensors 1. To remove the coolant temperature sensor, drain the coolant. 2. Remove the sensor, disconnect the connector. 3. Using an ohmmeter, measure the...

Manifold Absolute Pressure Sensor
1. Check the supply voltage of the absolute pressure sensor in the intake manifold. a) Disconnect the sensor connector. b) Turn on the ignition. c) Using a voltmeter, measure the voltage between the terminals of the...

Checking the knock sensor
1. Disconnect the cable from the negative terminal of the battery. 2. Remove the knock sensor, having first disconnected the sensor connectors. 3. Using an ohmmeter, make sure there is no conductivity between the sensor...

Idle speed boost system during power steering operation (A series)
Checking the solenoid valve 1. Remove the solenoid valve. 2. Using an ohmmeter, make sure that there is no break in the valve winding circuit by measuring its electrical resistance. Nominal resistance (at 20°C) - 33-39...

Electro-pneumatic valve for exhaust gas recirculation (EGR) system (4A-FE with automatic transmission)
4A-FE (automatic transmission) 1 - accelerator cable, 2 - throttle valve control cable (automatic transmission), 3 - connector of the intake air temperature sensor, 4 - air filter cover with air duct, 5 - vacuum hose, 6...

Fuel vapor recovery system solenoid valve
Checking the solenoid valve 1. Remove the solenoid valve. 2. Using an ohmmeter, make sure that there is no break in the valve winding circuit by measuring its electrical resistance. Nominal resistance (at 20°C) - 33-39...

Oxygen sensor
1. Warm up the engine to normal operating temperature. 2. Measure the oxygen sensor feedback voltage. a) Connect the positive lead of the voltmeter to the "VF1" terminal of the diagnostic connector and the negative lead...

Oxygen Sensor Fault Finding Algorithm

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