Fuel injection system (SOHC) of vehicle Honda Civic 5 and 6

Self-diagnosis procedure
1. When the MIL comes on, do the following: 1. Connect the shorted SCS connector to the diagnostic connector (the two-pin diagnostic connector is located under the front panel on the passenger side closer to the door)....

Removing the electronic engine control unit
If access to the ECM is required for individual voltage or resistance tests, remove the passenger side access panel. Move the mat back and unscrew the bolt securing the engine control unit. The illustration shown is for...

Checking and adjusting the idle speed
Check/Adjustment Adjust the idle speed using a Honda tester. If this is not possible, check the following: Note: Before adjusting the idle speed, check the following items: The MIL does not indicate a malfunction....

Fuel Hose/Quick Connectors
Precautionary measures Do not smoke while working on the fuel system. Keep open flames away from the workplace. The fuel hose assembly, along with the quick connectors, serves to connect the fuel line and the fuel pump...

Fuel system — description
The fuel system consists of a fuel tank, high pressure fuel pump, main injection relay, fuel filter, check valve, fuel injectors and fuel lines (supply and return).

Fuel pressure
Pressure release Before disconnecting fuel lines or hoses, relieve pressure in the fuel system by loosening the service bolt on top of the fuel filter. Do not smoke while working on the fuel system. Keep open flames...

Fuel injectors — description
Fuel injectors have an electromagnetic drive and a fixed opening value and consist of a solenoid, a needle valve and a housing. When current flows through the solenoid winding, the valve needle rises, opening the...

Check valve
Description The check valve maintains constant pressure at the fuel injectors. When the pressure difference between the fuel and intake manifolds exceeds 250 kPa (2.55 kg/cm 2 ) (engines D16Y4, D16Y9 - 294 kPa, 3.0...

Fuel filter
Replacement Attention: Do not smoke while working on the fuel system. Keep open flames away from the workplace. When replacing the fuel filter, be careful to keep it away from the battery terminals and other tools. The...

Fuel pump
Examination Attention: Do not smoke during the test. Keep open flames away from the workplace. If you suspect a faulty fuel pump, you can check its operation. In the ignition position OM, you can hear a characteristic...

Inertia switch (models KG, KE, KS, KR)
Description The inertia switch is a safety device that cuts off the fuel supply in the event of an accident or collision. The switch is located behind the glove compartment. After a collision, the switch must be reset...

Main injection relay
Description The main injection system relay consists of two independent relays. The relay is located on the passenger side of the hood. The first relay is activated when the ignition is turned on and powers the...

Fuel tank
Replacement Warning: Do not smoke while working on the fuel system. Keep open flames away from the workplace. 1. Relieve fuel pressure. 2. Remove the seat cushion. 3. Remove the floor access hatch. 4. Disconnect the 2K...

Air filter of the air intake system
Replacing the filter element Note: Do not blow out the filter element with compressed air (except for models KR, KY, KW, KT, KV).

Throttle drive cable
Inspection/Adjustment 1. Start the engine. Maintain rpm at 3000 without engine load (gearbox in neutral, automatic transmission selector in position [P] or [N]) until the electric fan turns on, then set the engine to...

Throttle body — check
Caution: Do not attempt to adjust the damper lock screw. It is installed by the manufacturer. 1. Start the engine. Maintain rpm at 3000 without engine load (gearbox in neutral, automatic transmission selector in...

Throttle body — removal and disassembly
Warning: The throttle stop lock screw is not adjustable. After reassembly, adjust the throttle cable. The throttle position sensor cannot be removed. Disassembly

Description of the exhaust gas emissions reduction system
The exhaust emission control system includes a three-component catalytic converter. crankcase ventilation system, fuel vapor removal system.

Exhaust emission control system — exhaust
Examination Warning: Do not smoke while performing this operation. Keep open flames away from the workplace. 1. Attach the tachometer. 2. Start the engine. Maintain rpm at 3000 without engine load (gearbox in neutral,...

Three way catalytic converter
Examination If high pressure is detected in the exhaust system, remove the catalytic converter and visually check it for clogging, melting and chipping of the working material. Replace the catalytic converter if any...

Crankcase ventilation system
Description Crankcase ventilation (PSV) designed to prevent crankcase gases from entering the atmosphere. The PSV valve contains a spring-loaded plunger. When the engine is running, the plunger rises in proportion to...

Fuel vapor removal system
Examination (except engines D14A3, D14A4) 1. Remove the fuel tank cap. 2. Start the engine and leave it idling. 3. Disconnect the vacuum hose from the evaporative control diaphragm valve and connect the vacuum sensor to...