HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for Gasoline Model)  Ambient Temperature Display System  

The ambient temp. sensor (thermistor assembly) is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the air conditioning system.

The ambient temp. sensor (thermistor assembly) detects fluctuations in the ambient temperature and sends it as a signal to the air conditioning amplifier assembly.

This data is used for controlling the cabin temperature.

The resistance of the ambient temp. sensor (thermistor assembly) changes in accordance with the ambient temperature.

As the temperature decreases, the resistance increases.

As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage to the ambient temp. sensor (thermistor assembly) and detects voltage changes due to changes in the resistance of the ambient temp. sensor (thermistor assembly).

NOTICE:

The ambient temp. sensor (thermistor assembly) detects the ambient temperature in its vicinity, not the ambient temperature around the vehicle.

Depending on factors such as radiant heat from the engine room and the vehicle speed, the ambient temperature detected by the ambient temp. sensor (thermistor assembly) may differ from the ambient temperature displayed on the multi-information display in the combination meter assembly.

For example:

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When the vehicle is stopped or being driven at low speeds, the displayed ambient temperature will not be updated to a higher temperature to adjust for and minimize the influence of radiant heat from the engine room on the air conditioning system control.

When the vehicle is not being driven at low speeds, the adjustment is performed, but updating of the displayed ambient temperature to a higher temperature is delayed.

The displayed ambient temperature will be updated to a lower temperature regardless of the vehicle speed.

·

When the ambient temperature around the ambient temp. sensor (thermistor assembly) suddenly changes due to any reason other than radiant heat from the engine room, such as when the vehicle enters or exits a garage or tunnel, the actual ambient temperature of the vehicle and the displayed ambient temperature may differ or changing of the displayed value may be delayed.

NOTICE:

·

Before starting the inspection, it is necessary to release the residual heat from the engine room (engine unit and coolant hoses, etc.) after stopping the engine and electric motor (when the vehicle is parked after being driven). Therefore, move and park the vehicle in the following type of temperature measurement location.

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A location within the vehicle service area which has a relatively low amount of environmental temperature changes in the area surrounding the vehicle.

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A location with a level surface made of a material such as concrete which transmits a relatively low amount of heat from the ground, such as concrete.

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A location with no heat influences around the vehicle to be inspected such as other vehicles with a running engine and electric motors, exhaust gas ducts installed on the exhaust pipes, stoves, etc.

·

The air conditioning system uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the air conditioning system after confirming that the communication systems are functioning properly.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM (for Gasoline Model)>HOW TO PROCEED WITH TROUBLESHOOTING202303,999999,_57,_111829,_0499998,RM10000000291N8,

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Ignition switch operation during parked vehicle inspection:

Turn the ignition switch to ON. (Do not start the engine and electric motor.)