Toyota Corolla Cross: Terminals Of Ecu

I48-1 (TAM) - Body ground

Thermistor assembly signal

• Ignition switch ON
• Ambient temperature: 25°C (77°F)

1.05 to 1.45 V

• Ignition switch ON
• Ambient temperature: 40°C (104°F)

0.64 to 0.87 V

I48-3 (SG-1) - Body ground

Ground for cooler thermistor (room temperature sensor)

Always

Below 1 V

I48-5 (TR) - I49-17 (GND)

Cooler thermistor (room temperature sensor) signal

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

1.05 to 1.45 V

• Ignition switch ON
• Cabin temperature: 40°C (104°F)

0.64 to 0.87 V

I48-6 (PRE) - I49-17 (GND)

Air conditioner pressure sensor signal

• Ignition switch ON (READY)
• Air conditioning system operating
• Refrigerant pressure: Abnormal pressure (more than 2812 kPa (28.7 kgf/cm2, 408 psi)

4.61 V or higher*1

• Ignition switch ON (READY)
• Air conditioning system operating
• Refrigerant pressure: Abnormal pressure (less than 196 kPa (2.0 kgf/cm2, 28 psi))

Below 0.74 V*1

• Ignition switch ON (READY)
• Air conditioning system operating
• Refrigerant pressure: Normal pressure (less than 2812 kPa (28.7 kgf/cm2, 408 psi) and more than 196 kPa (2.0 kgf/cm2, 28 psi))

0.74 to 4.61 V*1

I48-11 (S5-3) - I49-17 (GND)

Power supply for air conditioner pressure sensor

Ignition switch ON

4.75 to 5.25 V

Ignition switch off

Below 1 V

I48-14 (SG-2) - Body ground

Ground for thermistor assembly

Always

Below 1 V

I48-15 (SG-4) - Body ground

Ground for air conditioner pressure sensor

Always

Below 1 V

I49-1 (CANL) - I49-2 (CANH)

CAN communication system

CAN communication is performed

Pulse generation

I49-5 (B) - I49-17 (GND)

Power source (Back-up)

Always

11 to 14 V

I49-6 (IG+) - I49-17 (GND)

Power source (IG)

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

I49-7 (LIN1) - I49-17 (GND)

LIN communication signal

Ignition switch ON

Pulse generation

(See waveform 1)

I49-17 (GND) - Body ground

Ground for main power supply

Always

Below 1 V

I49-18 (SOL+) - I49-17 (GND)

Compressor solenoid operation signal

• Engine running
• Blower switch: LO
• A/C switch: On

Pulse generation

(See waveform 2)

I49-21 (BLW) - I49-17 (GND)

Blower motor speed control signal

• Ignition switch ON
• Blower switch: LO

Pulse generation

(See waveform 3)

z1-2 (BUS G) - Body ground

Ground for BUS IC

Always

Below 1 V

z1-3 (BUS) - z1-2 (BUS G)

BUS IC control signal

Ignition switch ON

Pulse generation

(See waveform 4)

z1-4 (B BUS) - z1-2 (BUS G)

Power supply for BUS IC

Always

11 to 14 V

z1-5 (SGA) - Body ground

Ground for No. 1 cooler thermistor

Always

Below 1 V

z1-6 (TEA) - z1-5 (SGA)

No. 1 cooler thermistor 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

Terminal No.

I49-7 (LIN1) - I49-17 (GND)

Tool Setting

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

Condition

Ignition switch ON

Terminal No.

I49-18 (SOL+) - I49-17 (GND)

Tool Setting

5 V/DIV., 500 μs./DIV.

Condition

• Engine running
• Blower switch: LO
• A/C switch: On

Terminal No.

I49-21 (BLW) - I49-17 (GND)

Tool Setting

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

Condition

• Ignition switch ON
• Blower switch: LO

Terminal No.

z1-3 (BUS) - z1-2 (BUS G)

Tool Setting

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

Condition

Ignition switch ON

I37-7 (LIN1) - Body ground

LIN communication signal

Ignition switch ON

Pulse generation

(See waveform)

I37-8 (ILL+) - Body ground

Illumination signal

Taillight off

Below 1 V

Taillight on

11 to 14 V

I37-9 (IG+) - I37-13 (GND)

Power source (IG)

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

I37-13 (GND) - Body ground

Ground for air conditioning control assembly

Always

Below 1 V

I37-14 (ILL-) - Body ground

Illumination signal

Always

Below 1 V

Terminal No.

I37-7 (LIN1) - Body ground

Tool Setting

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

Condition

Ignition switch ON