Ignition "OFF"
Disconnect Incar temp.sensor and Connect A/C control unit main harness connector.
Measure resistance between Signal(+) terminal of Incar temp.sensor harness connector and Sensor ground harness connector .(Component side)
Specification : Refer the specifications in fig.1)
Temperature(℃/℉) | Resistance(㏀) | Temperature(℃/℉) | Resistance(㏀) |
-20/-4 | 285.6 | 20/68 | 37.4 |
-10/14 | 164 | 30/86 | 24.1 |
0/32 | 97.7 | 40/104 | 15.9 |
10/50 | 59.67 | 50/122 | 10.8 |
Fig.1) ※ Specifications : Resistance value of incar sensor as a function of temperature.
※ The actual value may differ from it according to various engine condition.
Is "resistance" display near the specified value?
 | ▶ Go to "Check A/C-ECU" procedure. |
 | ▶ Substitute with a known-good Incar temp.sensor and check for proper operation. If the problem is corrected, replace Incar temp.sensor and then go to "Verification of Vehicle Repair" procedure. |
Ignition "OFF"
Disconnect Incar temp.sensor and Connect A/C control unit main harness connector.
Ignition "ON"(ENGINE "OFF").
Measure voltage between Signal(+) terminal of Incar temp.sensor harness connector and chassis ground .(Component side)
Specification : Approx. 5V
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. |
