-
１５
-
specifications.
Rotor Test:
Connect the test probes to opposite ends of the rotor contacts .
In general, resistance should be 0.1(
Ω
) or less. Refer to the Manufacture
’s
specifications.
[5] Pick-up Coil Resistance (
Ω
)/Voltage Test (V)
·
The Resistance test checks for open circuits or high resistance.
·
The Voltage test compares voltage output to resistance.
Test Procedure
·
Set the rotary switch to the
Resistance(
Ω
).
INSERT:
·
Black lead in
COM
terminal.
·
Red lead in
V/
Ω
/RPM
terminal.
·
Connect the test probes to the pick-up coil lead .
Resistance Specifications
The majority of the pick-up coils will test between 500-1500
Ω
’s resistance. See
manufacture
’s specification for required range.
·
Set rotary switch to
volts.
Press the select button , Alternate Function button
to select AC.
·
Crank engine 10-15 seconds at normal speed; measure voltage.
Resistance Test/Voltage Output
Resistance(
Ω
) on a
“
good
”
pickup coil will match AC output voltage (Ex.,950
Ω
’s=950mV output). Resistance can be good but voltage low if the magnet has
lost magnetism or if the reluctor is too far from the stator (Airgap).
[6] Hall Effect Sensor Voltage Test (V)
This test checks for switching action in any hall Effect sensor (Ignition, RPM,
Crankshaft, etc.)
·
Set the rotary switch to the
Voltage (V)
position.
INSERT:
·
Black lead in
COM
terminal.
·
Red lead in
V/
Ω
/RPM
terminal.
·
Connect the Black test probe to the negative (-) post on the battery.
·
Turn the ignition key ON. Touch the Red (+) test probe to the three test point
shown.
·
Ground reading should be the same voltage as the ground (Computer or
battery ).
·
Supply line reading should be the same voltage as the input source (Computer
or battery).
·
Signal line
reading should be 0 or the same voltage as the input source
(Computer or battery). The reading will toggle high and low as the shutter
rotates.
Basic Diagnostic Testing
This chapter describes a computer controlled sensor and actuator system
typically Found on today
’s automobile.
Test procedures are also provided for the basic ground of electrical input and
output components commonly found in a computer controlled automotive
system. The test procedures are, due to the complexity of components, general
theory tests. Be sure to consult the vehicle service manual for component
schematics and test specifications.
Computer Controlled Systems
A need for better fuel economy and lower emissions resulted in today
’s
automobiles Utilizing computer controlled functions that were previously
activated by mechanical, Electrical and vacuum devices.
