Toyota Tacoma (2015-2018) Service Manual: Terminals Of Ecu

Toyota Tacoma (2015-2018) Service Manual / Air Conditioning / Air Conditioning System(for Manual Air Conditioning System) / Terminals Of Ecu

TERMINALS OF ECU

1. AIR CONDITIONING AMPLIFIER ASSEMBLY

HINT:

Check from the rear of the connector while it is connected to the air conditioning amplifier assembly.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A14-1 (IG+) - A14-12 (GND)	P - W-B	Power source (IG)	Ignition switch ON	11 to 14 V
A14-1 (IG+) - A14-12 (GND)	P - W-B	Power source (IG)	Ignition switch off	Below 1 V
A14-2 (BLRH) - A14-12 (GND)	SB - W-B	Blower switch signal	Ignition switch: ON Blower switch: off	Below 1 V
A14-2 (BLRH) - A14-12 (GND)	SB - W-B	Blower switch signal	Ignition switch: ON Blower switch: on	11 to 14 V
A14-3 (MC) - A14-12 (GND)	BE - W-B	Air mix select switch signal	Ignition switch: ON Air mix switch: except MAX A/C	1 to 14 V
A14-3 (MC) - A14-12 (GND)	BE - W-B	Air mix select switch signal	Ignition switch: ON Air mix switch: MAX A/C	Below 1 V
A14-4 (LOCK) - A14-12 (GND)	G - W-B	A/C lock sensor signal	Engine running Blower switch: LO A/C switch: on	Pulse generation (See waveform 1)
A14-5 (PRE) - A14-12 (GND)	V - W-B	Air conditioner pressure sensor signal	Engine running Air conditioning system operating Refrigerant pressure: Abnormal pressure (more than 3025 kPa (30.8 kgf/cm2, 439 psi))	4.71 V or higher
			Engine running Air conditioning system operating Refrigerant pressure: Abnormal pressure (less than 176 kPa (1.8 kgf/cm2, 26 psi))	Below 0.74 V
			Engine running Air conditioning system operating Refrigerant pressure: Normal pressure (less than 3025 kPa (30.8 kgf/cm2, 439 psi) and more than 176 kPa (1.8 kgf/cm2, 26 psi))	0.74 to 4.71 V
A14-6 (TE) - A14-32 (SG-2)	B - GR	Evaporator temperature sensor signal	Ignition switch ON Evaporator temperature: 0°C (32°F)	1.7 to 2.1 V
A14-6 (TE) - A14-32 (SG-2)	B - GR	Evaporator temperature sensor signal	Ignition switch ON Evaporator temperature: 15°C (59°F)	0.9 to 1.3 V
A14-7 (TAM) - A14-33 (SG-1)	W - LG	Ambient temperature sensor signal	Ignition switch ON Ambient temperature: 25°C (77°F)	1.35 to 1.75 V
A14-7 (TAM) - A14-33 (SG-1)	W - LG	Ambient temperature sensor signal	Ignition switch ON Ambient temperature: 40°C (104°F)	0.9 to 1.2 V
A14-8 (S5-1) - A14-12 (GND)	SB - W-B	Power supply for air conditioner pressure sensor	Ignition switch off	Below 1 V
A14-8 (S5-1) - A14-12 (GND)	SB - W-B	Power supply for air conditioner pressure sensor	Ignition switch ON	4.5 to 5.5 V
A14-9 (ACT) - A14-12 (GND)	R - W-B	Compressor operation signal	Ignition switch ON A/C switch: off	Below 1 V
A14-9 (ACT) - A14-12 (GND)	R - W-B	Compressor operation signal	Ignition switch ON A/C switch: on	4.75 to 5.25 V
A14-10 (CANH)	L	CAN communication system	-	-
A14-11 (CANL)	W	CAN communication system	-	-
A14-12 (GND) - Body ground	W-B - Body ground	Ground for main power supply	Always	Below 1 Ω
A14-13 (PTC3) - A14-12 (GND)*1	P - W-B	Quick heater operation signal	Engine running Blower switch off Temperature settings: MAX HOT Engine coolant temperature 65°C or lower Ambient temperature 10°C or lower	11 to 14 V
A14-13 (PTC3) - A14-12 (GND)*1	P - W-B	Quick heater operation signal	Engine running Blower switch on Temperature settings: MAX HOT Engine coolant temperature 65°C or lower Ambient temperature 10°C or lower	Below 1 V
A14-14 (PTC2) - A14-12 (GND)*1	W - W-B	Quick heater operation signal	Engine running Blower switch off Temperature settings: MAX HOT Engine coolant temperature 65°C or lower Ambient temperature 10°C or lower	11 to 14 V
A14-14 (PTC2) - A14-12 (GND)*1	W - W-B	Quick heater operation signal	Engine running Blower switch on Temperature settings: MAX HOT Engine coolant temperature 65°C or lower Ambient temperature 10°C or lower	Below 1 V
A14-15 (PTC1) - A14-12 (GND)*1	V - W-B	Quick heater operation signal	Engine running Blower switch off Temperature settings: MAX HOT Engine coolant temperature 65°C or lower Ambient temperature 10°C or lower	11 to 14 V
A14-15 (PTC1) - A14-12 (GND)*1	V - W-B	Quick heater operation signal	Engine running Blower switch on Temperature settings: MAX HOT Engine coolant temperature 65°C or lower Ambient temperature 10°C or lower	Below 1 V
A14-18 (MGC) - A14-12 (GND)	G - W-B	Magnetic clutch operation signal	Engine running Blower switch: LO A/C switch: off	11 to 14 V
A14-18 (MGC) - A14-12 (GND)	G - W-B	Magnetic clutch operation signal	Engine running Blower switch: LO A/C switch: on	Below 1 V
A14-20 (REC) - A14-12 (GND)	R - W-B	Recirculation/Fresh switch signal	Ignition switch: ON Recirculation/Fresh switch switch: FRESH to RECIRCULATION	11 to 14 V (Servo motor operating)
A14-21 (B) - A14-12 (GND)	LG - W-B	Power source (Back-up)	Always	11 to 14 V
A14-22 (DEF) - A14-12 (GND)	R - W-B	Mode switch signal	Ignition switch: ON Mode switch: except DEF	1 to 14 V
A14-22 (DEF) - A14-12 (GND)	R - W-B	Mode switch signal	Ignition switch: ON Mode switch: DEF	Below 1 V
A14-26 (MR/F) - A14-12 (GND)	SB - W-B	REC switch operation signal	Ignition switch: ON REC switch: off	4 to 5 V
A14-26 (MR/F) - A14-12 (GND)	SB - W-B	REC switch operation signal	Ignition switch: ON REC switch: on	Below 1 V
A14-27 (A/C) - A14-12 (GND)	GR - W-B	A/C switch operation signal	Ignition switch: ON A/C switch: off	4 to 5 V
A14-27 (A/C) - A14-12 (GND)	GR - W-B	A/C switch operation signal	Ignition switch: ON A/C switch: on	Below 1 V
A14-32 (SG-2) - Body ground	GR - Body ground	Ground for evaporator temperature sensor	Always	Below 1 Ω
A14-33 (SG-1) - Body ground	LG - Body ground	Ground for air conditioner pressure sensor, ambient temperature sensor, A/C lock sensor	Always	Below 1 Ω
A14-35 (ACID) - A14-12 (GND)	B - W-B	A/C switch LED signal	Ignition switch: ON Blower switch: on A/C switch: off	11 to 14 V
A14-35 (ACID) - A14-12 (GND)	B - W-B	A/C switch LED signal	Ignition switch: ON Blower switch: on A/C switch: on	Below 3 V
A14-37 (AC1) - A14-12 (GND)	BE - W-B	Compressor operation signal	Ignition switch ON A/C switch: off	11 to 14 V
A14-37 (AC1) - A14-12 (GND)	BE - W-B	Compressor operation signal	Ignition switch ON A/C switch: on	Below 1 V
A14-40 (FRS) - A14-12 (GND)	V - W-B	Recirculation/Fresh switch signal	Ignition switch: ON Recirculation/Fresh switch switch: RECIRCULATION to FRESH	11 to 14 V Servo motor operating)

*1: w/ PTC Heater

(a) Waveform 1:

Item	Content
Terminal No.	A14-4 (LOCK) - A14-12 (GND)
Tool Setting	200 mV/DIV., 10 ms./DIV.
Vehicle Condition	Engine running Blower switch: LO A/C switch: on

2. ECM (2TR-FE) (See page 3. ECM (2GR-FKS) (See page )

3. ECM (2GR-FKS) (See page Data List / Active Test )

Dtc Check / Clear

DTC CHECK / CLEAR 1. DTC CHECK USING TECHSTREAM (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON. (c) Turn the Techstream on. (d) Enter the following menus: Body Electri ...

DATA LIST / ACTIVE TEST 1. DATA LIST Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. T ...

Other materials:

Inspection
INSPECTION PROCEDURE 1. INSPECT CLUTCH DISC ASSEMBLY NOTICE: When replacing the clutch disc assembly, make sure to perform an inspection of the flywheel sub-assembly and clutch cover assembly. (a) Using a vernier caliper, measure the rivet depth. Minimum rivet depth: 0.3 mm ...

Lost Communication with ECM / PCM "A" (U0100,U0104,U0122,U0125,U0126,U0129)
DESCRIPTION The millimeter wave radar sensor assembly and ECM communicate with each sensor and ECU via CAN communication. If any malfunction is detected in a CAN communication circuit, one or more CAN communication system DTCs are stored. DTC No. Detection Item ...

Precaution
PRECAUTION 1. PRECAUTIONS FOR REFRIGERANT HFO-1234yf (R1234yf) (a) Compatibility (1) The parts used in the refrigerant cycle, the compressor oil, etc. of the HFO-1234yf (R1234yf) system are not compatible with the conventional HFC-134a (R134a) system. (b) HFO-1234yf (R1234yf) Refrigerant (1 ...