Fuel System: 1G-8
Control Modes
Before start:
For 3 seconds after the ignition switch is turned “ON”, the fuel pump is controlled to operate at a 100% duty cycle to
initially pressurize the high pressure fuel line.
When cranking:
The fuel pump is controlled to operate at a 50 – 100% duty cycle.
The duty cycle changes depending on cylinder temperature.
When running (normal operation):
The fuel pump is controlled to operate at a 50 – 100% duty cycle based on the current engine speed and battery
voltage.
Air Intake Components Description
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Air, after entering through the silencer case, passes through the throttle body and flows into the surge tank where it is
then distributed to the intake manifold.
Intake manifold pressure, monitored by the MAP sensor, is an indirect measurement of the intake air amount.
When the throttle is fully closed, the main supply of intake manifold air necessary to sustain engine idle passes
through the by-pass air passage.
To maintain engine idle speed at specification, the ECM controlled IAC valve supplies a regulated amount of additional
air through the IAC (Idle Air Control) passage.
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2
3
5
6
7
4
Air flow
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1. Throttle body 3. Intake manifold 5. MAP sensor 7. Air intake silencer
2. IAC valve 4. Throttle position sensor 6. IAT sensor
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