Ignition "OFF"
Disconnect Ambient temperature Sensor and Connect A/C control module main harness connector.
Measure resistance between Signal(+) terminal of Ambient temperature Sensor harness connector and Sensor ground harness connector. (Component side)
Specification : Refer the specifications in Fig.1)
Temperature(℃/℉) | Resistance(㏀) | Temperature(℃/℉) | Resistance(㏀) |
-20/-4 | 271.4 | 50/122 | 11 |
0/32 | 95.1 | 60/140 | 7.58 |
25/77 | 30 |
Fig.1) Resistance value of Ambient temperature Sensor as a function of temperature.
Is measured value within specification?
 | ▶ Perform following procedures. |
 | ▶ Substitute with a known-good Ambient temperature Sensor and check for proper operation. If the problem is corrected, replace Ambient temperature Sensor and then go to "Verification of Vehicle Repair" procedure. |
Ignition "OFF"
Disconnect Ambient temperature Sensor(+) and Connect A/C control module main harness connector.
Ignition "ON", Engine "OFF"
Measure voltage between Signal(+) terminal of Ambient temperature Sensor(+) harness connector and chassis ground. (Component side).
Specification : Approx. 5V
Is measured value 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. |
