Mazda CX-9 2007 - Crankshaft Position (Ckp) Sensor Function [Mzi-3.5]; Knock Sensor (Ks) Construction;Operation [Mzi-3.5]; Knock Sensor (Ks) Function [Mzi-3.5]; Mass Air Flow (Maf) Sensor Construction;Operation [Mzi-3.5]

CONTROL SYSTEM [MZI-3.5]
01-40–8
KNOCK SENSOR (KS) FUNCTION [MZI-3.5]
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• Detects abnormal combustion in the engine.
End Of Sie
KNOCK SENSOR (KS) CONSTRUCTION/OPERATION [MZI-3.5]
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• The KS is the sensor on the engine which
converts engine vibration to an electrical signal.
• The PCM uses this signal to determine the
presence of engine knock and to retard spark
timing.
• Two KS have been adopted.
End Of Sie
NG: MASS AIR F LOW SENSOR
MASS AIR FLOW (MAF) SENSOR FUNCTION [MZI-3.5]
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• Detects intake air amount (mass airflow amount).
End Of Sie
MASS AIR FLOW (MAF) SENSOR CONSTRUCTION/OPERATION [MZI-3.5]
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• Incorporates the IAT sensor.
• The MAF sensor uses a hot wire sensing element
to measure the amount of air entering the engine.
• Air passing over the hot wire causes it to cool.
• This hot wire is maintained at 200°C (392°F)
above the ambient temperature as measured by a
constant cold wire.
• The current required to maintain the temperature
of the hot wire is proportional to the mass air flow.
• The MAF sensor then outputs an analog voltage
signal to the PCM proportional to the intake air
mass.
End Of Sie
NG: CRANKSHAFT POSITION SENSOR
CRANKSHAFT POSITION (CKP) SENSOR FUNCTION [MZI-3.5]
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• Detects the pulse wheel rotation pulse as the engine crank angle signal.
End Of Sie
KS
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AIR FLOW
AIR FLOW
COLD WIRE
HOT WIRE
MAF/IAT SENSOR
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MAF/IAT SENSOR
ac9uun00000143
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