Toyota Tacoma manuals

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

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

A35-1 (TAM) - A36-28 (SG-8)

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

A35-2 (PRE) - A36-10 (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

A35-3 (TPO) - A35-19 (SG-6)

B - L

Mode damper position sensor signal
  • Ignition switch ON
  • Mode switch: DEF

4.43 to 4.53 V
  • Ignition switch ON
  • Mode switch: FACE

0.47 to 0.57 V

A35-4 (TPR) - A35-18 (SG-5)

G - GR

Air mix damper position sensor (for front passenger side) signal
  • Ignition switch ON
  • Set temperature switch (for front passenger side): MAX HOT

4.45 to 4.55 V
  • Ignition switch ON
  • Set temperature switch (for front passenger side): MAX COOL

0.45 to 0.55 V

A35-5 (TPL) - A35-17 (SG-4)

V - R

Air mix damper position sensor (for driver side) signal
  • Ignition switch ON
  • Set temperature switch (for driver side): MAX HOT

4.45 to 4.55 V
  • Ignition switch ON
  • Set temperature switch (for driver side): MAX COOL

0.45 to 0.55 V

A35-6 (TPI) - A35-16 (SG-3)

LG -V

Air inlet damper position sensor signal
  • Ignition switch ON
  • Recirculation/Fresh switch: Fresh

1.63 to 1.73 V
  • Ignition switch ON
  • Recirculation/Fresh switch: Recirculation

3.27 to 3.37 V

A35-7 (LOCK) - A36-10 (GND)

G - W-B

A/C lock sensor signal
  • Engine running
  • Blower switch: LO
  • A/C switch: on

Pulse generation

(See waveform 1)

A35-10 (MGC) - A36-10 (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

A35-11 (AMDH) - A36-10 (GND)

BE - W-B

Air mix damper servo motor (for driver side) operating signal
  • Ignition switch ON
  • Set temperature switch (for driver side): MAX COOL to MAX HOT

11 to 14 V

(Servo motor operating)

A35-12 (AMDC) - A36-10 (GND)

SB - W-B

Air mix damper servo motor (for driver side) operating signal
  • Ignition switch ON
  • Set temperature switch (for driver side): MAX HOT to MAX COOL

11 to 14 V

(Servo motor operating)

A35-13 (AMPH) - A36-10 (GND)

Y - W-B

Air mix damper servo motor (for front passenger side) operating signal
  • Ignition switch ON
  • Set temperature switch (for front passenger side): MAX COOL to MAX HOT

11 to 14 V (Servo motor

(Servo motor operating)

A35-14 (AMPC) - A36-10 (GND)

W - W-B

Air mix damper servo motor (for front passenger side) operating signal
  • Ignition switch ON
  • Set temperature switch (for front passenger side): MAX HOT to MAX COOL

11 to 14 V

(Servo motor operating)

A35-16 (SG-3) - Body ground

V - Body ground

Ground for air inlet damper position sensor

Always

Below 1 Ω

A35-17 (SG-4) - Body ground

R - Body ground

Ground for air mix damper position sensor (for driver side)

Always

Below 1 Ω

A35-18 (SG-5) - Body ground

GR - Body ground

Ground for air mix damper position sensor (for front passenger side)

Always

Below 1 Ω

A35-19 (SG-6) - Body ground

L - Body ground

Ground for mode damper position sensor

Always

Below 1 Ω

A35-22 (AC1) - A36-10 (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

A35-25 (AIF) - A36-10 (GND)

P - W-B

Air inlet damper servo motor operating signal
  • Ignition switch ON
  • Recirculation/Fresh switch: Recirculation to Fresh

11 to 14 V

(Servo motor operating)

A35-26 (AIR) - A36-10 (GND)

B - W-B

Air inlet damper servo motor operating signal
  • Ignition switch ON
  • Recirculation/Fresh switch: Fresh to Recirculation

11 to 14 V

(Servo motor operating)

A35-27 (AOF) - A36-10 (GND)

LG - W-B

Mode damper servo motor operating signal
  • Ignition switch ON
  • Mode switch: DEF to FACE

11 to 14 V

(Servo motor operating)

A35-28 (AOD) - A36-10 (GND)

R - W-B

Mode damper servo motor operating signal
  • Ignition switch ON
  • Mode switch: FACE to DEF

11 to 14 V

(Servo motor operating)

A35-30 (S5-5) - A36-10 (GND)

G - W-B

Power supply for mode damper position sensor

Ignition switch off

Below 1 V

Ignition switch ON

4.75 to 5.25 V

A36-1 (IG+) - A36-10 (GND)

GR - W-B

Power source (IG)

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

A36-4 (ACT) - A36-10 (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

A36-7 (HRLY) - A36-10 (GND)

Y - W-B

HTR relay operation signal
  • Ignition switch ON
  • Blower switch: off

11 to 14 V
  • Ignition switch ON
  • Blower switch: LO

Below 1 V

A36-8 (CANH)

L

CAN communication system

-

-

A36-9 (CANL)

W

CAN communication system

-

-

A36-10 (GND) - Body ground

W-B - Body ground

Ground for main power supply

Always

Below 1 Ω

A36-11 (LIN1) - A36-10 (GND)

SB - W-B

LIN communication signal

Ignition switch ON

Pulse generation

A36-12 (S5-1) - A36-10 (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

A36-13 (S5-2) - A36-10 (GND)

Y - W-B

Power supply for air inlet damper position sensor

Ignition switch off

Below 1 V

Ignition switch ON

4.75 to 5.25 V

A36-14 (S5-3) - A36-10 (GND)

Y - W-B

Power supply for air mix damper position sensor (for driver side)

Ignition switch off

Below 1 V

Ignition switch ON

4.75 to 5.25 V

A36-15 (TE) - A36-27 (SG-7)

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

A36-16 (TR) - A36-26 (SG-1)

R - BR

Room temperature sensor signal
  • Ignition switch ON
  • Cabin temperature: 25°C (77°F)

1.8 to 2.2 V
  • Ignition switch on (IG)
  • Cabin temperature: 40°C (104°F)

1.2 to 1.6 V

A36-17 (B) - A36-10 (GND)

LG - W-B

Power source (Back-up)

Always

11 to 14 V

A36-19 (PTC1) - A36-10 (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

A36-20 (PTC2) - A36-10 (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

A36-21 (PTC3) - A36-10 (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

A36-23 (BLW) - A36-10 (GND)

BE - W-B

Blower motor speed control signal
  • Ignition switch ON
  • Blower switch: LO

Pulse generation

(See waveform 2)

A36-26 (SG-1) - Body ground

BR - Body ground

Ground for room temperature sensor

Always

Below 1 Ω

A36-27 (SG-7) - Body ground

GR - Body ground

Ground for evaporator temperature sensor

Always

Below 1 Ω

A36-28 (SG-8) - Body ground

LG - Body ground

Ground for air conditioner pressure sensor, ambient temperature sensor, A/C lock sensor

Always

Below 1 Ω

A36-29 (S5-4) - A36-10 (GND)

R - W-B

Power supply for air mix damper position sensor (for front passenger side)

Ignition switch off

Below 1 V

Ignition switch ON

4.75 to 5.25 V
  • *1: w/ PTC Heater

(a) Waveform 1:

Item

Content

Terminal No.

A35-7 (LOCK) - A36-10 (GND)

Tool Setting

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

Vehicle Condition
  • Engine running
  • Blower switch: LO
  • A/C switch: on

(b) Waveform 2:

Item

Content

Terminal No.

A36-23 (BLW) - A36-10 (GND)

Tool Setting

1 V/DIV., 500 μs./DIV.

Vehicle Condition
  • Ignition switch ON
  • Blower switch: LO

2. AIR CONDITIONING CONTROL ASSEMBLY

HINT:

HINT:

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

Terminal No.

(Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A33-8 (IG+) - A33-1 (GND)

LG - W-B

Power source (IG)

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

A33-1 (GND) - Body ground

W-B - Body ground

Ground for air conditioning control assembly

Always

Below 1 Ω

A33-2 (STX) - A33-1 (GND)

SB - W-B

LIN communication signal

Ignition switch ON

Pulse generation

3. ECM (See page ) Data List / Active Test )

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are lis ...

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:

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each sy ...

Check Bus 2 Lines for Short Circuit
DESCRIPTION There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is below 54 Ω. Detection Item Trouble Area Resi ...

Meter Illumination is Always Dark
DESCRIPTION In this circuit, the combination meter assembly receives auto dimmer signals from the main body ECU (multiplex network body ECU) using the CAN communication system (CAN V1 Bus). When the meter CPU receives an auto dimmer signal, it dims the meter illumination (warning and indicato ...

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