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

A14-1 (IG+) - A14-12 (GND)

P - W-B

Power source (IG)

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

A14-2 (BLRH) - A14-12 (GND)

SB - W-B

Blower switch signal

Below 1 V

11 to 14 V

A14-3 (MC) - A14-12 (GND)

BE - W-B

Air mix select switch signal

1 to 14 V

Below 1 V

A14-4 (LOCK) - A14-12 (GND)

G - W-B

A/C lock sensor signal

Pulse generation

(See waveform 1)

A14-5 (PRE) - A14-12 (GND)

V - W-B

Air conditioner pressure sensor signal

4.71 V or higher

Below 0.74 V

0.74 to 4.71 V

A14-6 (TE) - A14-32 (SG-2)

B - GR

Evaporator temperature sensor signal

1.7 to 2.1 V

0.9 to 1.3 V

A14-7 (TAM) - A14-33 (SG-1)

W - LG

Ambient temperature sensor signal

1.35 to 1.75 V

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

Ignition switch ON

4.5 to 5.5 V

A14-9 (ACT) - A14-12 (GND)

R - W-B

Compressor operation signal

Below 1 V

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

11 to 14 V

Below 1 V

A14-14 (PTC2) - A14-12 (GND)*1

W - W-B

Quick heater operation signal

11 to 14 V

Below 1 V

A14-15 (PTC1) - A14-12 (GND)*1

V - W-B

Quick heater operation signal

11 to 14 V

Below 1 V

A14-18 (MGC) - A14-12 (GND)

G - W-B

Magnetic clutch operation signal

11 to 14 V

Below 1 V

A14-20 (REC) - A14-12 (GND)

R - W-B

Recirculation/Fresh switch signal

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

1 to 14 V

Below 1 V

A14-26 (MR/F) - A14-12 (GND)

SB - W-B

REC switch operation signal

4 to 5 V

Below 1 V

A14-27 (A/C) - A14-12 (GND)

GR - W-B

A/C switch operation signal

4 to 5 V

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

11 to 14 V

Below 3 V

A14-37 (AC1) - A14-12 (GND)

BE - W-B

Compressor operation signal

11 to 14 V

Below 1 V

A14-40 (FRS) - A14-12 (GND)

V - W-B

Recirculation/Fresh switch signal

11 to 14 V

Servo motor operating)

Terminal No.

A14-4 (LOCK) - A14-12 (GND)

Tool Setting

200 mV/DIV., 10 ms./DIV.

Vehicle Condition