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Procedures for servicing fuel injection systems and engine management and safety measures

In the secondary circuit of electronic ignition systems can produce hazardous high voltage. For this reason, when working with components of the ignition system, or near them should take special precautions.

Do not start the engine if you are not sure of the purity and reliability of fastening lugs of the terminals of the battery.

Do not use to start the car charger.

Before disconnecting the battery cable (or connect them) do not forget to switch off the ignition (key in position OFF).

Before servicing the engine control system components required to disconnect the negative wire from the battery.

Before welding wire must be disconnected from the battery, and do not forget disconnects the electrical connector of the control unit (ECU).

Avoid heating ECU higher than 80 ?� C.

Keep the mounting and reliability of all electrical connections.

Before disconnecting any component of the engine management system is required to turn off the ignition (OFF).

Before removing the components of the feed path of the power required to relieve the pressure in the system. Remember that the system is constantly under pressure (even with the engine off).

Do not spill or spray water during cleaning engine components of the engine management system.

When handling with all components of the engine management system, in particular with the lambda probe, be careful.

Do not attempt to disassemble electronic components. In the event of their failure Replace blocks.

Do not apply the battery voltage directly to the fuel injectors.

Using the diagnostic equipment

Universal measuring parameters of electric circuits (meter)

When checking the voltage or resistance circuits using only a digital multimeter with an impedance of 10 megohms.

All measurements should be made with the electrical connectors connected components, unless otherwise specifically stated otherwise in the instructions to implement checks. This probe device inserted into the connector on the back of his hand. If the probes are not sufficiently thin, they can be improved by attaching to an end length of wire, thin enough not to damage the respective connector. Make a secure electrical and mechanical contact with the probe wire.

If the scan was shot with a connector sealing cap or guard, then be sure to set it in place.

Light-Probe

Use a lamp-sampler only where it is stipulated instructions. To prevent failure of electronic components, use only probes lamp power less than 3.6 watts.

To test the lamp power, use the exact ammeter (eg digital multimeter) - when you turn on the meter in series with the lamp and 12 V voltage reading should not exceed 0.3 A (300 mA).

If the appropriate lamp-sampler at hand is, fabricate it from the LED.

When used as a signaling element of the probe LED lamp remember that the latter, by definition, passes current in one direction only. Those probe lamp must be connected to the positive side of the sensed component.

Preliminary checks

Before embarking on the search for the causes of failure in the proper engine management system, perform the following test.

PERFORMANCE ORDER

Check for fuel in the tank. Check the condition and the contacts of all the electrical connectors and the ground terminal components engine management system. Check the condition of the battery. Make the necessary corrections. Check the condition of the air filter element. If necessary, replace. Check the fuel pressure. Check the mechanical condition of the engine and in the right setting. Check the condition and fastening of all vacuum hoses. Make sure there are no air leaks / loss of vacuum through the intake manifold, throttle body and the pressure chamber of an air path. Check the operation of the system controlled crankcase ventilation (PCV). Check the coolant level and make sure the engine is at normal operating temperature.