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Crankshaft Position Sensor (Method With Oscilloscope)

Disconnect the ground terminal from battery sensor. < Ref. to BATTERY , NOTE, Note. >
Prepare an oscilloscope.
Remove the engine control module (ECM). < Ref. to REMOVAL , Engine Control Module (ECM). >
Install the ST between the ECM and bulkhead harness and the engine harness. < Ref. to CAUTION , General Descriptions
ST 18460AA030 CHECK BOARD
Connect the ground terminal to battery sensor. < Ref. to BATTERY , NOTE, Note. >

Connect the probe to ST.

Fig 1: Connecting Ground Terminal To Battery Sensor

G10291244

Courtesy of SUBARU OF AMERICA, INC.

Terminal No.	Probe
19	+
31	-

Start the engine and let it idle.
Check the waveforms and voltage.
NOTE: For waveform and voltage, refer to "Engine Control Module (ECM) I/O Signal". < Ref. to ENGINE CONTROL MODULE (ECM) I/O SIGNAL . >
After inspection, install the related parts in the reverse order of removal.