Ignition "OFF"
Disconnect evaporator sensor and Connect A/C control Module 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(㏀) |
-4/-24.8 | 32.9 | 4/39 | 23 |
-2/28 | 30 | 6/42 | 21 |
0/32 | 27 | 8/46 | 19 |
2/35 | 25 | 10/50 | 18 |
Fig.1) Resistance value of evaporator sensor as a function of temperature.
Is "resistance" display near the specified value?
 | ▶ Go to Next 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 Module 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 the measured voltage within specification?
| ▶ 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 control Module and check for proper operation. If the problem is corrected, replace A/C control Module and then go to "Verification of Vehicle Repair" procedure.. |
