July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Crankshaft Position Sensor

Disconnect the ground terminal from battery sensor. Ref. to NOTE>NOTE>BATTERY .
Prepare an oscilloscope.
Remove the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Control Module (ECM)>REMOVAL .
Attach the ST between the ECM and bulkhead wiring harness. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>General Description>CAUTION .
ST 18460AA050 CHECK BOARD

Connect the probe to ST.

Fig 1: Attaching ST Between ECM And Bulkhead Wiring Harness

G11263341

Courtesy of SUBARU OF AMERICA, INC.

Terminal No.	Probe
40	+
27	-

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 (DIAGNOSTICS) (H4DO)>Engine Control Module (ECM) I/O Signal>ELECTRICAL SPECIFICATION .
After inspection, install the related parts in the reverse order of removal.