Discovery I (LJ) V8-4.0L (1996)
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Air Flow Meter/Sensor: Description and Operation
Mass air flow sensor (MAF Sensor)
The "hot wire" type mass air flow sensor is mounted rigidly to the air filter and connected by flexible hose to the plenum chamber inlet. The sensing
element of the MAF Sensor is a hot wire anenometer consisting of two wires, a sensing wire which is heated and a compensating wire which is not
heated. Air flows across the wires cooling the heated one, changing its resistance. The ECM measures this change in resistance and calculates the
amount of air flowing into the engine.
As there is no default strategy, failure will result in the engine starting, and dying when it reaches 550 rev/min, when the ECM detects no MAF Sensor
signal. The fault is indicated by illumination of the malfunction indicator light (MIL) on North American specification vehicles.
