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 MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)DESCRIPTION AND OPERATION
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Description and Operation
Engine Coolant Sensor:
PURPOSE
Information concerning engine operating temperature is supplied to the Digital Motor Electronic (DME) control unit by the coolant temperature sensor.
OPERATION
The sensor is a Negative Temperature Co-efficient (NTC) type, in which the resistance value of the sensor decreases as the temperature of the coolant increases. The resistance value produced by the sensor is used by the DME control unit to correct fuel injector opening time during cold starting and warm-up periods. If the sensor becomes defective (open circuit), the engine will run very rich until the DME control unit has time to implement a substitute value and emergency run program.
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.