Ignition "OFF"
Disconnect Water temp.sensor and Connect A/C control unit main harness connector.
Measure resistance between Signal(+) terminal of Water temp.sensor harness connector and Sensor ground harness connector .(Component side)
Specification : Refer the specifications in Fig.1)
Temperature(℃/℉) | Resistance(㏀) | Temperature(℃/℉) | Resistance(㏀) |
-10/14 | 55.8 | 40/104 | 5.3 |
0/32 | 32.9 | 60/140 | 2.4 |
20/68 | 12.5 | 80/176 | 1.2 |
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.
Is "resistance" display within specifications?
 | ▶ 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. |
Ignition "OFF"
Disconnect Water temp.sensor and Connect A/C control unit main harness connector.
Ignition "ON"(ENGINE "OFF").
Measure voltage between Signal(+) terminal of Water temp.sensor harness connector and chassis ground .(Component side)
Specification : approx. 5V
Is "voltage" display within specifications?
| ▶ 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. |
