Toyota Tacoma (2015-2018) Service Manual: System Description

Toyota Tacoma (2015-2018) Service Manual / Air Conditioning / Air Conditioning System(for Manual Air Conditioning System) / System Description

SYSTEM DESCRIPTION

1. GENERAL

(a) The air conditioning system has the following controls.

Control	Outline
Manual Control	The air conditioner amplifier assembly controls the damper positions (air inlet control damper, air mix control damper and mode control damper) and blower speed in accordance with the positions of the switches (temperature control dial, blower dial, mode select dial and air inlet control switch).
Air Inlet Control	Drives the air inlet servo motor (damper servo sub-assembly) according to the operation of the air inlet control switch and moves the dampers to the fresh or recirculation position.
Compressor Control	Controls the compressor with magnet clutch assembly to turn on or off based on the signals from various sensors.
MAX Air Conditioning Control	When the temperature control dial is turned to the MAX A/C position, the air conditioner amplifier assembly performs the following control to improve cooling efficiency: Turns the compressor with magnet clutch assembly on. Activates the air inlet servo motor (damper servo sub-assembly) to set the air inlet control damper to the recirculation position.*
Diagnosis	A Diagnostic Trouble Code (DTC) is stored in the memory when the air conditioner amplifier assembly detects a problem with the air conditioning system.

*: for Double Cab

2. MODE POSITION AND DAMPER OPERATION

(a) Mode Position and Damper Operation

Functions of Main Dampers

Control Door	Operation Position		Door Position	Operation
Air Inlet Control Door	FRESH		A	Brings in fresh air.
Air Inlet Control Door	RECIRCULATION		B	Recirculates internal air.
Air Mix Control Door	MAX COLD to MAX HOT Temperature Setting		C - D - E (C' - D' - E')	Varies the mixture ratio of warm air and cool air in order to regulate the temperature continuously between hot and cold.
Mode Control Door		FACE	F, J, N	Air blows out of the front center register and side register.
		BI-LEVEL	G, L, N	Air blows out of the front center register, side register and front and rear footwell register ducts*.
		FOOT	H, M, O	Air blows out of the front and rear footwell register ducts. In addition, air blows out slightly from the front and rear center register, side register and defroster.
		FOOT AND DEFROSTER	H, M, P	Defrosts the windshield through the center defroster, side defroster, side register, front and rear center register ducts, while air is also blown out from the front and rear footwell register ducts.
		DEFROSTER	I, J, Q	Defrosts the windshield through the center defroster, side defroster.

*: for Double Cab

3. AIR OUTLETS AND AIRFLOW VOLUME

(a) Air Outlets and Airflow Volume

HINT:

The size of each circle ○ indicates the ratio of airflow volume.

How To Proceed With Troubleshooting

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System Diagram

SYSTEM DIAGRAM ...

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