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

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
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:

Components
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Precaution
PRECAUTION CAUTION: The vehicle is equipped with SRS, which consists of a driver airbag, front passenger airbag, side airbags and curtain shield airbags and knee airbags. Failure to carry out service operations in the correct sequence could cause the SRS to unexpectedly deploy ...

Removal
REMOVAL PROCEDURE 1. REMOVE FRONT FENDER SEAL LH (a) Remove the 5 clips and front fender seal LH. 2. REMOVE FRONT FENDER SEAL RH HINT: Use the same procedure as for the LH side. 3. REMOVE FRONT EXHAUST PIPE ASSEMBLY (a) Disengag ...

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