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 MANUALSSUBARU1990XT-6 4WD L6-2.7L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCRANKSHAFT POSITION SENSORDESCRIPTION AND OPERATION
1990 Subaru XT-6 4WD L6-2.7L SOHC
Crankshaft Position Sensor: Description and Operation
1990 Subaru XT-6 4WD L6-2.7L SOHCSECTION Description and Operation
Crank Angle Sensor:
PURPOSE
The crank angle sensor is a photoelectric sensing mechanism. It provides a crank angle signal and cylinder identification signal to the ECU. This information is used for proper fuel and ignition timing.
LOCATION
The sensor is built into the distributor housing.
CONSTRUCTION
The sensor consists of a slotted rotor plate and two LED/photo diode pairs. On the outer ring of the rotor plate, their are 4 slits positioned 90° apart. This portion of the sensor reports cylinder TDC to the ECU.
Inside the outer sensor ring, are 360 slots spaced at 1° increments. This portion of the sensor is used to determine actual piston position.
OPERATION
A signal is generated by the sensor whenever the engine is rotating. By combining the 90° & 1° signals, the ECU is able to compute the position of each piston.
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.