Toyota Camry (XV70): Terminals Of Ecu

Toyota Camry Repair Manual XV70 (2018-2024) / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System (for Manual Air Conditioning System) / Terminals Of Ecu

TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

w/o Seat Heater

w/ Seat Heater

HINT:

Check from the rear of the connector while it is connected to the air conditioning amplifier assembly.
Make sure to wait at least 2 minutes after turning the ignition switch off before performing an ECU terminal inspection.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
K55-2 (SG-2) - Body ground	W - Body ground	Ground for thermistor assembly	Always	Below 1 V
K55-3 (SG-4) - Body ground	L - Body ground	Ground for air conditioner pressure sensor	Always	Below 1 V
K55-6 (S5-3) - K55-3 (SG-4)	GR - L	Power supply for air conditioner pressure sensor	Ignition switch ON	4.75 to 5.25 V
K55-6 (S5-3) - K55-3 (SG-4)	GR - L	Power supply for air conditioner pressure sensor	Ignition switch off	Below 1 V
K55-13 (TAM) - K55-2 (SG-2)	R - W	Thermistor assembly signal	Ignition switch ON Ambient temperature: 25°C (77°F)	1.05 to 1.45 V
K55-13 (TAM) - K55-2 (SG-2)	R - W	Thermistor assembly signal	Ignition switch ON Ambient temperature: 40°C (104°F)	0.64 to 0.87 V
K55-24 (PRE) - K55-3 (SG-4)	W - L	Air conditioner pressure sensor signal	Engine running Air conditioning system operating Refrigerant pressure: Abnormal pressure (more than 2812 kPaG (28.7 kgf/cm2, 408 psi))	4.61 V or higher
			Engine running Air conditioning system operating Refrigerant pressure: Abnormal pressure (less than 196 kPaG (2.0 kgf/cm2, 28 psi))	Below 0.74 V
			Engine running Air conditioning system operating Refrigerant pressure: Normal pressure (less than 2812 kPaG (28.7 kgf/cm2, 408 psi) and more than 196 kPaG (2.0 kgf/cm2, 28 psi))	0.74 to 4.61 V
K54-1 (B) - K54-4 (GND)	LA-B - W-B	Power source (Back-up)	Always	11 to 14 V
K54-2 (IG+) - K54-4 (GND)	LA-GR - W-B	Power source (IG)	Ignition switch ON	11 to 14 V
K54-2 (IG+) - K54-4 (GND)	LA-GR - W-B	Power source (IG)	Ignition switch off	Below 1 V
K54-3 (SOL+) - K54-4 (GND)	R - W-B	Compressor solenoid operation signal	Engine running Blower switch: LO A/C switch: On	Pulse generation (See waveform 1)
K54-4 (GND) - Body ground	W-B - Body ground	Ground for main power supply	Always	Below 1 V
K54-6 (BLW) - K54-4 (GND)	LG - W-B	Blower motor speed control signal	Ignition switch ON Blower switch: LO	Pulse generation (See waveform 2)
K54-11 (CANH) - K54-12 (CANL)	SB - W	CAN communication system	CAN communication is performed	Pulse generation
K54-14 (LIN1) - K54-4 (GND)	W - W-B	LIN communication signal	Ignition switch ON	Pulse generation (See waveform 3)
z29-2 (1A) - Body ground	-	Ground for BUS IC	Always	Below 1 V
z29-3 (2A) - z29-2 (1A)	-	BUS IC control signal	Ignition switch ON	Pulse generation (See waveform 4)
z29-4 (3A) - z29-2 (1A)	-	Power supply for BUS IC	Ignition switch off	11 to 14 V
z29-5 (4A) - Body ground	GR - Body ground	Ground for No. 1 cooler thermistor	Always	Below 1 V
z29-6 (5A) - z29-5 (4A)	GR - GR	No. 1 cooler thermistor signal	Ignition switch ON Evaporator temperature: 0°C (32°F)	1.7 to 2.1 V
z29-6 (5A) - z29-5 (4A)	GR - GR	No. 1 cooler thermistor signal	Ignition switch ON Evaporator temperature: 15°C (59°F)	0.9 to 1.3 V

(a) Waveform 1:

Item	Content
Terminal No.	K54-3 (SOL+) - K54-4 (GND)
Tool Setting	5 V/DIV., 500 ?s./DIV.
Condition	Engine running Blower switch: LO A/C switch: On

(b) Waveform 2:

Item	Content
Terminal No.	K54-6 (BLW) - K54-4 (GND)
Tool Setting	2 V/DIV., 1 ms./DIV.
Condition	Ignition switch ON Blower switch: LO

Item	Content
Terminal No.	K54-14 (LIN1) - K54-4 (GND)
Tool Setting	2 V/DIV., 20 ms./DIV.
Condition	Ignition switch ON

(d) Waveform 4:

Item	Content
Terminal No.	z29-3 (2A) - z29-2 (1A)
Tool Setting	2 V/DIV., 2 ms./DIV.
Condition	Ignition switch ON

CHECK 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
K26-2 (IG+) - K26-6 (GND)	GR - W-B	Power source (IG)	Ignition switch off	Below 1 V
K26-2 (IG+) - K26-6 (GND)	GR - W-B	Power source (IG)	Ignition switch ON	11 to 14 V
K26-6 (GND) - Body ground	W-B - Body ground	Ground for air conditioning control assembly	Always	Below 1 V
K26-9 (LIN1) - Body ground	LG - Body ground	LIN communication signal	Ignition switch ON	Pulse generation (See waveform)
K26-11 (ILL+) - Body ground	W - Body ground	Illumination signal	Light control switch in off position	Below 1 V
K26-11 (ILL+) - Body ground	W - Body ground	Illumination signal	Light control switch in tail or head position	11 to 14 V
K26-15 (ILL-) - Body ground	B - Body ground	Illumination signal	Always	Below 1 V

(a) Waveform:

Item	Content
Terminal No.	K26-9 (LIN1) - Body ground
Tool Setting	2 V/DIV., 20 ms./DIV.
Condition	Ignition switch ON

SEE MORE:

Sudden start restraint control (Drive-Start Control [DSC] )

When the following unusual operation is performed with the accelerator pedal depressed, the engine output may be restrained. When the shift lever is shifted to R*. When the shift lever is shifted from P or R to forward drive shift position such as D*. When the system operates, a message

Insufficient Coolant Temperature for Closed Loop Fuel Control (P012500)

DESCRIPTION Refer to DTC P011511. Click here DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note P012500 Insufficient Coolant Temperature for Closed Loop Fuel Control The engine coolant temperature does not reach the closed loop

Toyota Camry (XV70): Terminals Of Ecu

READ NEXT:

Diagnosis System

Dtc Check / Clear

Data List / Active Test

SEE MORE:

Sudden start restraint control (Drive-Start Control [DSC] )

Insufficient Coolant Temperature for Closed Loop Fuel Control (P012500)