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Model UT107: OPERATING MANUAL
The MAP sensor is used to change a pressure signal
into a DC voltage or frequency one. All GM, Chrysler,
Honda and Toyota use DC voltage type MAP sensors,
while Ford uses frequency type MAP sensors. Refer to
relevant manuals for other automotive manufacturers.
Testing Procedure:
Connect the DC voltage type MAP sensor in the DC
voltage testing method and set the rotary switch to
20 VDC.
Connect the frequency type MAP sensor in the
RPMx10 testing method and set the meter to the
number of cylinders in the automobile.
Taking 4 cylinders (4CYL) for example, connect the
black test lead probe of the meter to the ground
terminal (i.e. ground strap connection) and connect
the red one as illustrated in figure 20.
Turn on the ignition key but do not start the engine.
Displayed Values:
DC Voltage Type Sensor: In a vacuum state, the
displayed value is generally between 3 V and 5 V.
(The details shall be based on the parameters
furnished by the supplier.)
Frequency Type Sensor: In a vacuum state, the
displayed value is generally 4770 RPM 5%. (This
only applies to the MAP sensor produced by Ford
and the other sensors shall be based on the
parameters furnished by the supplier.)
(1)
(2)
(3)
(4)
Warning
The reading becomes the actual RPM only after
it is multiplied by 10.
Frequency = RPM/30. (This only applies to
4CYL.)
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