GM Cadillac 1967-1989 Repair Guide

Engine Temperature Sensor (ETS)

Print

OPERATION



See Figure 1

The engine temperature sensor has two terminals. Twelve volts are applied to one terminal and the wire from the other terminal leads to the fast idle solenoid and Housing Pressure Cold Advance solenoid that is part of the injection pump.

The switch contacts are closed below 125°F (52°C). At the calibration point, the contacts are open which turns off the solenoids.



Click image to see an enlarged view

Fig. Fig. 1: Engine Temperature Sensor (ETS) - diesel engine

ABOVE CALIBRATION
  1. Open circuit.
  2.  

BELOW CALIBRATION
  1. Closed circuit.
  2.  

 
label.common.footer.alt.autozoneLogo