October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Camshaft 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, Notes

Connect the probe to ST.

Intake camshaft position sensor

Fig 1: Connecting Ground Terminal To Battery Sensor - Intake Camshaft Position Sensor
Courtesy of SUBARU OF AMERICA, INC.

Exhaust camshaft position sensor

Fig 2: Connecting Ground Terminal To Battery Sensor - Exhaust Camshaft Position Sensor

Courtesy of SUBARU OF AMERICA, INC.

Camshaft position sensor		Terminal No.	Probe
Intake	RH	20	+
Intake	LH	21	+
Exhaust	RH	32	+
Exhaust	LH	33	+
RH and LH		34	-

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.