15
In general, resistance should be 0.1 (
Ω
) or less. Refer to the Manufacture's
specifications.
[5] Pick-up Coil Resistance (
Ω
Ω
Ω
Ω
)/ Voltage Test (
Ω
Ω
Ω
Ω
)
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 Blue, 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).
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
