Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu

TERMINALS OF ECU

1. AIR CONDITIONING AMPLIFIER ASSEMBLY

HINT:

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

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

  • 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

  • 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

  • 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

  • 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

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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

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