Mazda 2007 CX-9, Service Highlights

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CONTROL SYSTEM [MZI-3.5]
01-40–8
KNOCK SENSOR (KS) FUNCTION [MZI-3.5]
id0140c1174100
•
Detects abnormal combustion in the engine.
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KNOCK SENSOR (KS) CONSTRUCTION/OPERATION [MZI-3.5]
id0140c1174200
•
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.
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NG: MASS AIR FLOW SENSOR
MASS AIR FLOW (MAF) SENSOR FUNCTION [MZI-3.5]
id0140c1176800
•
Detects intake air amount (mass airflow amount).
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MASS AIR FLOW (MAF) SENSOR CONSTRUCTION/OPERATION [MZI-3.5]
id0140c1176700
•
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.
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NG: CRANKSHAFT POSITION SENSOR
CRANKSHAFT POSITION (CKP) SENSOR FUNCTION [MZI-3.5]
id0140c1177400
•
Detects the pulse wheel rotation pulse as the engine crank angle signal.
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KS
ac9uun00000142
AIR FLOW AIR FLOW
COLD WIRE
HOT WIRE
MAF/IAT SENSOR
ac9uun00000177
MAF/IAT SENSOR
ac9uun00000143
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