CONTROL SYSTEM
01–40–24
FUEL PUMP CONTROL BLOCK DIAGRAM
CHU014000140S22
• The PCM determines the engine starting condition based on each input signal and controls the fuel pump relay
on/off.
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FUEL PUMP CONTROL OPERATION
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Operation condition
• When the ignition switch is turned from off to on, the fuel pump relay turns on for approx. 1 s.
Note
• When the ignition switch is turned from off to on, the operation sound of the fuel pump unit can be heard,
but this does not indicate an abnormality.
• During cranking (ignition switch: START), the fuel pump relay turns on for approx. 1 s.
• After the engine starts (ignition switch: ON), the fuel pump relay turns on repeatedly each time an input signal
from the eccentric shaft position sensor is input. Due to this, the fuel pump relay remains on.
• When the engine stalls (ignition switch: ON) and the input signal from the eccentric shaft position sensor stops,
the fuel pump relay turns on for approx. 2 s, and then turns off.
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FUEL PUMP SPEED CONTROL OUTLINE
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• The fuel pump speed control turns the fuel pump speed control relay on/off according to the required fuel
amount, switching between two fuel pump speed levels.
• Excess load on the fuel pump is reduced by control of the fuel pump speed. Due to this, reliability has been
improved as well as an assured delivery of the optimum fuel amount according to the engine conditions.
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PCM
IGNITION SWITCH
ECCENTRIC SHAFT
POSITION SENSOR
FUEL PUMP RELAY
CHU0140S020
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