Ambient Temperature Sensor Inspection

WARNING: This page is about a different car, the 2016 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
Remove the front under cover. (See FRONT UNDER COVER REMOVAL/INSTALLATION .)
Remove the ambient temperature sensor. (See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION .)
Measure the temperature around the ambient temperature sensor and measure the resistance between the ambient temperature sensor terminals A and B.

Fig 1: Identifying Ambient Temperature Sensor Connector Terminal
Courtesy of MAZDA MOTORS CORP.
- If the characteristics of the ambient temperature sensor are not as shown in the graph, replace the ambient temperature sensor. (See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION .)

Fig 2: Ambient Temperature Sensor Characteristics Graph

Courtesy of MAZDA MOTORS CORP.