Ignition "OFF"
Disconnect Evaporator sensor and Connect A/C control unit main harness connector.
Measure resistance between Signal(+) terminal of Evaporator sensor harness connector and Sensor ground harness connector. (Component side)
Specification : Refer the specifications in Fig.1)
Temperature(℃/℉) | Resistance(㏀) | Temperature(℃/℉) | Resistance(㏀) |
-10/-14 | 18 | 20/68 | 4.8 |
0/32 | 11 | 30/86 | 3.3 |
10/50 | 7.3 | 40/104 | 2.3 |
FIG.1) ※ Specifications : Resistance value of Evaporator 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 Evaporator sensor and check for proper operation. If the problem is corrected, replace Evaporator sensor and then go to "Verification of Vehicle Repair" procedure. |
Ignition "OFF"
Disconnect Evaporator sensor and Connect A/C control unit main harness connector.
Ignition "ON"(ENGINE "OFF").
Measure voltage between Signal(+) terminal of Evaporator 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. |
