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 MANUALSBMW1987L7 (E23) L6-3430CC 3.4L SOHC (M30)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)DESCRIPTION AND OPERATION
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Description and Operation
There are three devices which send coolant temperature information to the ECU. They are the coolant temperature sensor, coolant temperature switch, and the thermo time switch. All three devises are located in the water jacket of the engine block.
The ECU interprets the signals from these sensors as cold or normal operating temperatures. During cold operating conditions, the air/fuel ratio is enrichened by the cold start valve for starting, and the injectors while warming to normal operating temperature.
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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.