Mass Air Flow MAF
2-45
Test C - Air Flow Meter Position Switch
Warning: Observe all safety precautions (see page ii) if testing sensor on
vehicle.
1) Do all Test Preparation steps.
Refer to page 2-42.
2) Connect test leads.
Connect TEST leads according to diagram C in the compo-
nent drawing.
3) Verify test clips make good contact and do not touch
each other.
Make sure unused clips are not touching anything.
4) Set RANGE switch to HIGH.
5) Set FUNCTION switch to OHMS.
6) Operate sensor - Watch TEST light for results.
Slowly move the sensor element (pivoting “door” or sliding
cone) back and forth from fully closed to fully open position.
Use a pencil, or similar object, to push on the “door”. This will
not harm the sensor.
RANGE
HIGH
LOW
POWER OFF
FUNCTION
VOLTS
OHMS
FREQUENCY
TEST TEST
Good Switch
- TEST light switches between being
ON at top of column and OFF
Bad Switch
- TEST light always ON at top of
column or always OFF.
7) Test C is complete.
Set RANGE switch to POWER OFF and remove all
test leads. Reconnect sensor to vehicle if all testing
is done.
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