Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1.6L Engine
On the 1.6L engine, a high pressure fuel pump draws fuel from tank and delivers it to fuel charging manifold assembly. Power to pump is supplied through the fuel pump relay (located on a bracket above the ECA) and inertia switch. Operation of the fuel pump relay is controlled by the ECA module which regulates power to the pump, based on changing engine operating conditions.
The fuel pump relay is activated by the ECA with ignition switch in "START" or "RUN" positions. When ignition switch is turned to either position, the relay is activated to supply initial line pressure to system. If engine stalls or is not started within 1 second, the ECA shuts off power to the pump.
The inertia switch is located behind left rear kick panel. It is designed to open the fuel pump power circuit in the event of a collision. This switch must be manually reset by pushing the button on top of the switch. The inertia switch should not be reset until fuel system has been inspected for damage or leaks.
Fuel is pumped through fuel lines to fuel injectors and pressure regulator, mounted on fuel rail. The injectors are fitted into the air intake manifold just above intake valves. Fuel pressure at injectors is maintained at a constant value by pressure regulator. Fuel supplied by fuel pump in excess of that required for engine operation is by-passed by the regulator and returned to fuel tank via fuel return line.
All injectors are energized, simultaneously, once every crankshaft revolution. Engine fuel requirements are satisfied by varying amount of time that injectors are left open (injector "on" time). This injector "on" time is determined and controlled by the ECA.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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