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.
Primary Speed Sensor: Inspection
2016 Subaru Legacy 2.5iSECTION Inspection
WARNING: This page is about a different variant/trim than selected.
- Remove the bulkhead harness connector from TCM. < Ref. to REMOVAL , Transmission Control Module (TCM). >
- Set the ST between the TCM and bulkhead harness.
ST 18460AA040 CHECK BOARD
- Set the probe of oscilloscope to the check board connector.
Terminals:
No. 14 (+) - No. 42 (-)
- Start and warm up the engine.
- Check the waveform of primary speed sensor with engine idling.NOTE: The waveform cycle changes as the speed changes.
RENDER: 1.0x
NO RELATED
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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.