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Oxygen sensor
The oxygen sensor measures the oxygen levels in the exhaust gases and feeds this
information to the engine ECM. Based on this information, adjustments to air/fuel ratio
are made.
Primary throttle position sensor
Sensor for the primary (lower) throttle position.
Purge valve duty cycle (if fitted)
The time the purge valve is open in an open/close cycle, expressed as a percentage of
the cycle time.
Road speed sensor
The rear wheel speed sensor is used to supply road speed data to the engine ECM.
Secondary air injection (if fitted)
A small amount of air injected into the exhaust port to reduce the levels of pollutants in
the exhaust gases.
Sensor supply Voltage
Supply voltage to the system sensors (nominally 5 volts).
Short circuit
A short cut in an electrical circuit - current bypasses the intended circuit (usually to
ground).
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