Precautionary measures (Honda Fit 1)

Precautions when servicing electrical equipment

1. Check that the engine settings are correct (see chapter "Maintenance and general check and adjustment procedures").

2. Use the battery as a power source for the stroboscope, tachometer, etc.

3. If the engine misfires, the following precautions should be taken.

• a) The wires must be securely connected to the battery terminals.
• b) After completing the repair work, make sure that all ignition system wires are correctly and securely connected.
• c) When cleaning the engine compartment, do not allow water to come into contact with the electronic system components.

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 car is equipped with a radio station, CB, etc. (even with an output power of only 10 W), it can in some cases affect the operation of the electronic unit, especially when the antenna and connecting (feeder) cables are laid near the electronic control unit. Therefore, the following precautions must be observed:

1. Install the antenna as far away from the electronic control unit as possible. The unit is located under the dashboard, so the antenna should be installed at the rear of the car.



2. Route the antenna cable as far away from the ECU wiring as possible, at least 20 cm, and especially do not twist them together.

3. Check that the antenna cable and antenna are correctly configured.

4. Do not install a powerful radio station in your car.

5. Do not open the cover or case of the electronic control unit unless absolutely necessary (some terminals may be damaged by static electricity).

Precautions when working with the air supply system

1. Removing the oil dipstick, oil filler cap, hoses, etc. from a running engine may cause engine adjustments to be out of adjustment.

2. Disconnection, loosening of fasteners or cracking of air supply system components (between the throttle body and cylinder head) will cause air to leak, which will lead to engine malfunction.

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 wires from the battery terminals.

Caution: Be sure to read the diagnostic code before removing the battery cables.

2. When installing the battery, do not reverse the polarity.

3. Do not subject fuel injection system components, especially the electronic control unit, to impact.

4. Be careful when troubleshooting, with a large number of transistor circuits, even a slight careless touch of the terminals can lead to serious damage.

5. Do not open the cover of the electronic control unit housing.



6. When working in rainy weather, protect (electronic control units) from water. The same should be done when washing the engine.

7. Replacement of spare parts should be carried out only with similar ones.

8. Be careful when disconnecting and connecting electrical wiring connectors.

• a) When disconnecting, loosen the lock by pressing on its spring and pull out the connector, holding it by the body.
• b) When connecting, insert the connector fully and make sure it is locked (fastened).

9. When checking the connector with a tester.

• a) If you are testing a waterproof connector, you must carefully remove the protective cover.

• b) When checking resistance, current or voltage, always insert the tester probe from the wire side.

• c) Do not apply excessive force.
• d) After checking, firmly install the protective cover on the connector.

10. When checking injectors and their connectors, use special tools (special diagnostic cables).

Precautions when working with the fuel system

1. Before working on the fuel system, disconnect the cable from the negative terminal of the battery.

Caution: Any diagnostic code in the memory of the electronic control unit is erased when the cable from the negative terminal of the battery is removed. Therefore, it is necessary to read the diagnostic codes before disconnecting the battery.

2. Do not smoke or use open flames when working on the fuel system.

3. Do not allow gasoline to come into contact with rubber or leather objects.

4. Before working on the fuel lines, relieve residual fuel pressure (see section "Fuel system").

5. The quick release coupling can be reconnected, but if you removed the holder from the fuel line, it will need to be replaced.

The holder must be replaced when:

• extraction from the fuel line;
• its damage;
• replacing the fuel manifold;
• replacement of fuel lines;
• replacing the fuel pump; replacing the fuel filter;
• replacing the fuel vapor filter;
• replacing the fuel filler pipe;
• replacing the fuel tank.

6. When working with quick-release fuel line connections, observe the following.

• a) Make sure the connections are clean, clean them if necessary.
• b) Place a rag on quick-release coupling "A".

• c) Disconnect part "A" of the quick release coupling, lock connector "B" with one hand and squeeze tube holder "C" with the other hand, releasing it from locking tab "D". Disconnect the coupling.

Note:

• Do not damage the "E" line and other parts.
• Do not use special tools.
• Do not remove the holder from the fuel line, once removed, replace it with a new one.

• c) Check the quick-release coupling for dirt and damage.
• d) To prevent damage and dirt from getting into the fuel line, place plastic bags on its ends.

7. Precautions when removing and installing injectors.

• a) Never reuse an O-ring.
• b) When installing the O-ring on the injector, be careful not to damage it in any way.
• c) Before installation, lubricate the O-ring with spindle oil or fuel. Never use engine oil, transmission oil or brake fluid.

8. After servicing the fuel system, check for fuel leaks.

Note: After working on the fuel system, check the engine for leaks and fuel odor for a week.