Surtek MUL04 Manual De Usuario Y Garantía página 44

Ford uses frequency type MAP sensors. Refer to relevant manuals for other
automotive manufacturers..
Testing Procedure:
a. Connect the DC voltage type MAP sensor in the DC voltage testing method
and set the rotary switch of the meter to 20 VDC.
b. Connect the frequency type MAP sensor in the RPM x10 testing method and
set the meter to the number of cylinders in the automobile.
c. 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 Fig. 18.
d. 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.).
WARNING
• The reading becomes the actual RPM only after it is multiplied by 10.
• Frequency = RPM/30. (This only applies to 4CYL.)
5. Mass Air Flow (MAF) Sensor (see Fig. 18)
The sensor converts the air flow into a DC voltage, low frequency or high frequency
signal. UT105 can only be used to test a DC voltage or low frequency signal.
Testing Procedure:
a. Connect the DC voltage type MAF sensor in the DC voltage testing method
and set the rotary switch of the meter to 20VDC. Connect the frequency type
MAF sensor in the RPMx10 testing method and set the meter to the number of
cylinders in the automobile. Now take 4 cylinders (4CYL) for example.
b. 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 Fig. 19
c. Turn on the ignition key but do not start the engine.
Displayed Values:
44
Fig. 18