Toyota CH-R Service Manual: Terminals Of Ecu

Toyota CH-R Service Manual / Heating / Air Conditioning / Air Conditioning System(for Automatic Air Conditioning System With Side-mounted Air Conditioner Pressure Sensor) / Terminals Of Ecu

TERMINALS OF ECU

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

F138-1 (SG-1) - Body ground

LG - Body ground

Ground for cooler thermistor (room temperature sensor)

Always

Below 1 V

F138-2 (SG-2) - Body ground

G - Body ground

Ground for air conditioner pressure sensor

Always

Below 1 V

F138-6 (S5-3) - F138-2 (SG-2)

GR - G

Power supply for air conditioner pressure sensor

Ignition switch ON

4.75 to 5.25 V

Ignition switch off

Below 1 V

F138-14 (TR) - F138-1 (SG-1)

B - LG

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

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

1.2 to 1.6 V

F138-24 (PRE) - F138-2 (SG-2)

V - G

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))

4.61 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 4.61 V

F139-1 (B) - F139-4 (GND)

V - W-B

Power source (Back-up)

Always

11 to 14 V

F139-2 (IG+) - F139-4 (GND)

B - W-B

Power source (IG)

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

F139-3 (SOL+) - F139-4 (GND)

B - W-B

Compressor solenoid operation signal
  • Engine running
  • Blower switch: Lo
  • A/C switch: On

Pulse generation

(See waveform 1)

F139-4 (GND) - Body ground

W-B - Body ground

Ground for main power supply

Always

Below 1 V

F139-6 (BLW) - F139-4 (GND)

Y - W-B

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

Pulse generation

(See waveform 2)

F139-11 (CANH) - F139-12 (CANL)

P - SB

CAN communication signal

CAN communication is performed

Pulse generation

F139-14 (LIN1) - F139-4 (GND)

BE - W-B

LIN communication signal (Air conditioning control assembly)

Ignition switch ON

Pulse generation

(See waveform 3)

m1-2 (BUSG) - Body ground

B - Body ground

Ground for BUS IC

Always

Below 1 V

m1-3 (BUS) - m1-2 (BUSG)

L - B

BUS IC control signal

Ignition switch ON

Pulse generation

(See waveform 4)

m1-4 (BUSB) - m1-2 (BUSG)

R - B

Power supply for BUS IC

Always

11 to 14 V

m1-5 (SG-4) - Body ground

GR - Body ground

Ground for No. 1 cooler thermistor (evaporator temperature sensor)

Always

Below 1 V

m1-6 (TE) - m1-5 (SG-4)

GR - GR

No. 1 cooler thermistor (evaporator temperature sensor)
  • 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

(a) Waveform 1:

Item

Content

Terminal No. (Symbol)

F139-3 (SOL+) - F139-4 (GND)

Tool Setting

5 V/DIV., 500 μs/DIV.

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

(b) Waveform 2:

Item

Content

Terminal No.

F139-6 (BLW) - F139-4 (GND)

Tool Setting

2 V/DIV., 1 ms./DIV.

Vehicle Condition
  • Ignition switch ON
  • Blower switch: Lo

(c) Waveform 3:

Item

Content

Terminal No.

F139-14 (LIN1) - F139-4 (GND)

Tool Setting

2 V/DIV., 20 ms./DIV.

Vehicle Condition

Ignition switch ON

(d) Waveform 4:

Item

Content

Terminal No.

m1-3 (BUS) - m1-2 (BUS G)

Tool Setting

2 V/DIV., 2 ms./DIV.

Vehicle Condition

Ignition switch ON

AIR CONDITIONING CONTROL ASSEMBLY

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

F61-16 (GND) - Body ground

W-B - Body ground

Ground for air conditioning control assembly

Always

Below 1 V

F61-2 (LIN1) - Body ground

BE - Body ground

LIN communication signal

Ignition switch ON

Pulse generation

(See waveform 1)

F61-10 (IG+) - F61-16 (GND)

BE - W-B

Power source (IG)

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

(a) Waveform 1:

Item

Content

Terminal No.

F61-2 (LIN1) - Body ground

Tool Setting

2 V/DIV., 20 ms./DIV.

Vehicle Condition

Ignition switch ON
    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 ...

    Diagnosis System
    DIAGNOSIS SYSTEM DESCRIPTION Air conditioning system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be mal ...

    Other materials:

    Toyota CH-R Service Manual > Blind Spot Monitor System: Blind Spot Monitor Master Module Beam Axis Inspection Incomplete (C1ABB)
    DESCRIPTION This DTC is stored when a beam axis adjustment has not been performed for the blind spot monitor sensor LH (Master). HINT: This DTC is always stored after replacing a blind spot monitor sensor. The purpose of this DTC is to ensure that a beam axis adjustment is performed. Completi ...

    Toyota CH-R Service Manual > Theft Deterrent System: Data List / Active Test
    DATA LIST / ACTIVE TEST DATA LIST HINT: 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. This non-intrusive inspection can be very useful because intermittent conditions or signals may ...

    Toyota C-HR (AX20) 2023-2025 Owner's Manual

    Toyota CH-R Owners Manual

    Toyota CH-R Service Manual

    © 2017-2025 Copyright www.tochr.net
    0.0115