Toyota CH-R Service Manual: 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

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