Montero LS 4WD V6-2972cc 3.0L SOHC 24 Valve (1996)
Volume Air Flow Sensor: Testing and Inspection
VOLUME AIR FLOW SENSOR
OPERATION
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The volume air flow sensor is incorporated within the air cleaner, it functions to convert the amount of engine air intake to pulse signals of a
frequency proportional to the amount of engine air intake, and to input those signals to the engine control module. The engine control module
then, based upon those signals, calculates the amount of fuel injection, etc.
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The power for the volume air flow sensor is supplied from the MFI relay to the volume air flow sensor, and is grounded at the engine control
module. The volume air flow sensor, by intermitting the flow of the 5 V voltage applied from the engine control module, produces pulse
signals.
TROUBLESHOOTING HINTS
Hint 1:
If the engine sometimes stalls, try starting the engine and shaking the volume air flow sensor harness. If the engine then stalls, incorrect or
improper contact of the volume air flow sensor connector is the probable cause.
Hint 2:
If the volume air flow sensor output frequency is any value other than zero when the ignition switch is switched ON (but the engine is not started),
a malfunction of the volume air flow sensor or of the engine control module is the probable cause.
Hint 3:
If idling is possible even though the volume air flow sensor output frequency is outside the standard value, the cause is usually a malfunction other
than of the volume air flow sensor.
