Component Inspection
■ Check Water temp.sensor
1.

Ignition "OFF"

2.

Disconnect Water temp.sensor and Connect A/C control unit main harness connector.

3.

Measure resistance between Signal(+) terminal of Water temp.sensor harness connector and Sensor ground harness connector.

Specification : Refer the specifications in fig.1)

note
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Fig.1)

Temperature(℃/℉)

Resistance(㏀)

Temperature(℃/℉)

Resistance(㏀)

-10/14

45.9

40/104

3.27

0/32

25

60/140

1.4

20/68

8.43

80/176

0.7

Fig.1) ※ Specifications : Resistance value of Water sensor as a function of temperature.

※ The actual value may differ from it according to various engine condition.

4.

Is "resistance" display near the specified value?

▶ Go to "Check A/C-ECU" procedure.

▶ Substitute with a known-good Water temp.sensor and check for proper operation. If the problem is corrected, replace Water temp.sensor and then go to "Verification of Vehicle Repair" procedure.

■ Check A/C-ECU
5.

Ignition "OFF"

6.

Disconnect Water temp.sensor and Connect A/C control unit main harness connector.

7.

Ignition "ON"(ENGINE "OFF").

8.

Measure voltage between Signal(+) terminal of Water temp.sensor harness connector and chassis ground.

Specification : approx. 5V

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9.

Is "voltage" display near the specified value?

▶ Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

▶ Substitute with a known-good A/C-ECU and check for proper operation. If the problem is corrected, replace A/C-ECU and then go to "Verification of Vehicle Repair" procedure.

Яндекс.Метрика