1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 381Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 381

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DIAGNOSTICS

CIRCUIT DESCRIPTION:
The Engine Coolant Temperature (ECT) Sensor uses thermistor to control the signal voltage to the ECMThe ECM applies voltage on CKT 410 to the sensor