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Testing Sensors
Section
2
On-Car test: Crank engine. STAY AWAY from moving
engine parts. Observe all safety precautions (see
page ii) - engine may start or backfire.
Good sensor
- PULSE light flashes or stays ON
during cranking (varies with sensor type).
Bad sensor
- PULSE light OFF during cranking.
Note: Some computer systems will store a trouble code
in memory (and turn on the “Check Engine” light) if
engine is cranked with sensor disconnected. Ignore or
erase the code after testing. Refer to vehicle service
manual.
Off-Car test: Slide a flat piece of iron or steel in and
out of the sensor slot. Use a scrap piece of sheet
metal, knife blade, steel ruler or similar.
Good sensor
- Single flash on PULSE light whenever
metal is moved in and out of slot. (The flash will
occur either when the metal enters the slot or when
it is removed - depends upon sensor.)
Bad sensor
- PULSE light OFF during testing.
10) Testing is complete.
Set RANGE switch to POWER OFF and remove all test
leads.
PULSE
Chrysler Distributor
Hall Effect
Ford Distributor Hall Effect
(PIP Sensor, TFI-IV Ignition
Red
Black
Yellow
Red
Yellow Black