Electronic Fuel Injection (EFI)

EFI – Fuse box

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PURPOSE
The fuse box is designed to hold fuses and relays and there may be several of these around the vehicle.  It’s always a good idea to keep a few spare fuses, just in case.

THINGS TO LOOK FOR
When checking the fuses, it’s best to check the fuses with a test light and don’t rely on the fuse index map indicating where the fuses connect as they may be incorrect.  What is meant by the map is that sometimes when ...

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EFI – Computer

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PURPOSE
The computer or ECM [electronic control module] or ECU[electronic control unit] is designed to manage the fuel system, ignition system, and depending on the design, it also manages the automatic transmission as well as turning on the air conditioning.  The computer is programmed to collect information and make about 11,000 decisions every minute.  It may also store fault codes for the technician to decipher and rectify problems as required.

THINGS TO LOOK FOR
The computer is located in a cool ...

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EFI – ELECTRONIC FUEL INJECTION

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PURPOSE
Electronic fuel injection [EFI] is designed to manage the fuel system and inject fuel into the combustion chamber.  There are several types of EFI eg group injection, sequential injection.  All injection systems are designed to offer 95% fuel economy in normal operating temperatures.

THINGS TO LOOK FOR
Any EFI will suffer if the fuel level runs low.  This being a main focus as this will cause the EFI to fail. Because the fuel operates on pressure and when the fuel ...

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EFI – Fuel pump relay

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PURPOSE
The fuel pump relay is designed to switch the fuel pump on with a low voltage.  At the same time the relay is a heavy duty switch making it possible to switch on and off without wearing out the switch or preventing arcing in the switch.  A fuel pump relay is designed to switch off if overloaded.

THINGS TO LOOK FOR
When the fuel pump relay seems to be getting warm to hot, this indicates that it is either being ...

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EFI – Fuel pump fuse

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PURPOSE
The fuel pump fuse is designed to operate within a specification of between 10-15 amps and will break when it’s overloaded.  A fuel pump fuse continuing to break is not the fault of the fuse but is designed to protect the wiring looms in the fuel pump circuit.

THINGS TO LOOK FOR
A breaking fuel pump fuse could be an indication that it is being overload.  This may also happen when running out of fuel.  A fuse breaking more than ...

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