3239126 - 1056BF Check efficiency of hot film air flow meter

Make sure that the ignition is in the OFF position, then disconnect the negative battery terminal (refer to op.   5530B10  battery - r+r ). Disconnect the electrical connection from the hot film air flow meter.

	Name	Connector
-	Air flow meter	K41

1, Air temperature sensor 2, 14 Volt supply 3, Earth 4, 5 Volt reference voltage 5, Output voltage (signal) Check the air flow meter curve by measuring the voltage between pins 3 and 5 in accordance with the air flow rate.Check that the nominal resistance of the hot film air flow meter corresponds to the recommended value.

	Measurement		Value
-	Nominal resistance (ohm)	Pin 1-3	2000 +/- 5%
	at 25°C ()	-