Component Testing

Coolant Temperature Sensor Test:

PROCEDURE
1. Disconnect wire harness connector from Engine Coolant Temperature (ECT) sensor.

2. Test the resistance of the ECT with a high input impedance (digital) volt-ohmmeter.

^ The resistance should be less than 1000 ohms with the engine warm. For actual resistance values, refer to the following ECT/MAT resistance chart. Replace the sensor if it is not within the range of resistance specified in the chart.

3. Test continuity of the wire harness. This is done between engine controller wire harness connector (terminal 2) and the sensor connector terminal. Also check continuity between wire harness (terminal 4) to the sensor connector terminal.

^ Repair the wire harness if an open circuit is indicated.




TEMPERATURE RESISTANCE (OHMS)

°C °F MIN MAX


-40 -4O 291,490 381,710

-20 -4 85,850 108,390

-10 14 49,250 61,430

0 32 29,330 35,990

10 50 17,990 21,810

20 68 11,370 13,610

25 77 9,120 10,880

30 86 7,370 8,750

40 104 4,900 5,750

50 122 3,330 3,880

60 14O 2,310 2,670

70 158 1,630 1,870

80 176 1,170 1,340

90 194 860 970

100 212 640 720

110 230 480 540

120 248 370 410