Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSSUBARU2014FORESTER 2.5I, ENG CD FB25BA, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 3 (FUEL INJECTION FUEL SYSTEMS (H4DOTC))CAMSHAFT POSITION SENSORINSPECTIONCAMSHAFT POSITION SENSOR (METHOD WITH OSCILLOSCOPE)

2014 Subaru Forester 2.5i, Eng CD FB25BA, Standard Trans

Camshaft Position Sensor (Method With Oscilloscope)

2014 Subaru Forester 2.5i, Eng CD FB25BA, Standard TransSECTION Camshaft Position Sensor (Method With Oscilloscope)

WARNING: This page is about a different variant/trim than selected.

Disconnect the ground cable from battery.
Prepare an oscilloscope.
While pressing the section (A) shown in the figure, move the lock lever (B) in the direction of the arrow to disconnect the connectors from the ECM in numerical order as shown in the figure.

Fig 1: Identifying ECM Connector Lever Loosening Sequence
Courtesy of SUBARU OF AMERICA, INC.
Install the special tool between the ECM and body harness and the engine harness. < Ref. to CAUTION , General Description. >
ST 18460AA030 CHECK BOARD
Connect the battery ground terminal.

Connect the probe to ST.

Intake camshaft position sensor

Fig 2: Identifying Check Board Connector (Intake Camshaft Position Sensor)
Courtesy of SUBARU OF AMERICA, INC.

Exhaust camshaft position sensor

Fig 3: Identifying Check Board Connector (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 pattern is the same as the waveform and voltage shown below.

Fig 4: Engine Voltage Waveform At Idle
Courtesy of SUBARU OF AMERICA, INC.
After inspection, install the related parts in the reverse order of removal.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.