DR-25A Sensor Calibration Engine Coolant

This test must be performed with engine warm.

1. Connect voltmeter between logic module blue electrical connector terminal No. 23 and ground, then place ignition switch in Run position.
2. If voltmeter reading is between 2 to 3 volts, proceed to Test 25 step B.
3. If reading is not between 2 to 3 volts, replace coolant sensor.
CAUTION: Before replacing the coolant sensor make sure engine coolant is at operating temperature.