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 MANUALSSUBARU1991XT 4WD F4-1781CC 1.8L SOHCREPAIR AND DIAGNOSISSPECIFICATIONSELECTRICAL SPECIFICATIONSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)
1991 Subaru XT 4WD F4-1781cc 1.8L SOHC
Coolant Temperature Sensor/Switch (For Computer)
1991 Subaru XT 4WD F4-1781cc 1.8L SOHCSECTION Coolant Temperature Sensor/Switch (For Computer)
IGNITION TIMING SPECIFICATIONS
Manual transmission 20° /700 rpm
Automatic transmission 20° /800 rpm
Firing order 1-3-2-4
RESISTANCE SPECIFICATIONS
Air flow meter:
Between terminals B and BR and ground 10 ohms max.
Between power terminal R and ground 10V min.
Voltage across terminals W and BR 1-2V
Auxiliary air valve Resistance other than 0 or infinity
Canister purge solenoid 32.7-39.9 ohms
Coolant temperature sensor:
20° C (68° F) 2-3K ohms
50° C (122° F) 700-1000 ohms
Fuel injectors 2-3 ohms
Throttle sensor:
Between terminals 3 and 2 6-18K ohms
Between terminals 3 and 1 5.8-17.8K ohms (throttle closed)
Between terminals 3 and 1 1.5-5.1K ohms (throttle open)
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.