Ignition "OFF"
Disconnect ambient sensor and Connect A/C control Module main harness connector.
Measure resistance between Signal(+) terminal of ambient sensor harness connector and Sensor ground harness connector. (Component side)
Specification : Refer the specifications in Fig.1)
Temperature(℃/℉) | Resistance(㏀) | Temperature(℃/℉) | Resistance(㏀) |
-20/-4 | 284 | 20/68 | 37 |
-10/-14 | 164 | 30/86 | 24 |
0/32 | 97 | 40/104 | 16 |
10/50 | 59 | 50/122 | 10 |
Fig.1) Resistance value of ambient sensor as a function of temperature.
Is "resistance" display near the specified value?
 | ▶ Go to Next procedure. |
 | ▶ Substitute with a known-good ambient sensor and check for proper operation. If the problem is corrected, replace ambient sensor and then go to "Verification of Vehicle Repair" procedure. |
Ignition "OFF"
Disconnect Ambient Temp. sensor (+) and Connect A/C control Module main harness connector.
Ignition "ON"(ENGINE "OFF").
Measure voltage between Signal(+) terminal of Ambient 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 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. |
