Mass air flow sensor unit (686), E39
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Mass air flow sensor unit (686), E39
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Mass air flow sensor unit (686), E39
Sends information on air mass flow to the control module and serves as main sensor for fuel injection.
The mass air flow sensor unit (686, E39) contains a mass air flow sensor (205) and temperature sensor (772).
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686 pin no.
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Signal type
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Description
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D
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Signal
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Connected to ECM pin 49(B)
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E
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Signal
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Connected to ECM pin 69(B)
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A
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Signal
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Connected to ECM pin 52(B).
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B
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Ground
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Sensor ground to grounding point G1.
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C
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Power supply, B+
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Sensor power supply.
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Mass air flow sensor pin B grounded to grounding point G1 via crimp connection J212.
When the ignition is turned to the "ON" position, the main relay operates and B+ is supplied to mass air flow sensor pin C via crimp connection J220 from fuse 8 in the petrol engine management system fuse box (727).
