Mass air flow sensor unit (686), E39
| Mass air flow sensor unit (686), E39 |
| Location |
Mass air flow sensor unit (686), E39
| Main task |
Sends information on air mass flow to the control module and serves as main sensor for fuel injection.
| Type |
The mass air flow sensor unit (686, E39) contains a mass air flow sensor (205) and temperature sensor (772).
| Connection |
| 686 pin no. | Signal type | Description |
| D | Signal | Connected to ECM pin 49(B) |
| E | Signal | Connected to ECM pin 69(B) |
| A | Signal | Connected to ECM pin 52(B). |
| B | Ground | Sensor ground to grounding point G1. |
| C | Power supply, B+ | Sensor power supply. |
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).
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