ford Workshop Repair Guides

Ford Workshop Service and Repair Manuals

Lighting and Horns > < Pinpoint Tests|Page 3968
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Engine Coolant Temperature (ECT) Sender: Testing and Inspection

1. Let engine cool, then disconnect water temperature indicator sender unit connector.
2. Measure resistance between water temperature indicator sender unit terminal and ground.
3. Start engine and check resistance as follows:

a. Between 89.7-154.3°F, 189.4-259.6 ohms.
b. Between 206.5-172.5°F, 24.2-28.1 ohms.

4. If resistance is not as specified, replace sender. If resistance is within specifications, return to system pinpoint test.  See: Temperature

Gauge/Testing and Inspection/Pinpoint Tests

Lighting and Horns > < Pinpoint Tests|Page 3968