Terminals Of Ecu

WARNING: This page is about a different car, the 2007 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

CHECK AIR CONDITIONING AMPLIFIER

Fig 1: Identifying Air Conditioning Amplifier ECU Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage and resistance of the connectors.

HINT:

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

AIR CONDITIONING AMPLIFIER ECU TERMINALS VOLTAGE AND RESISTANCE SPECIFICATION

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
S5-3 (E36-7) - GND (E36-24)	B - W-B	Power supply for pressure sensor	Ignition switch ON	4.5 to 5.5 V
CANH (E36-8) - GND (E36-24)	V - W-B	Hi-level CAN bus line	Ignition switch ON	Pulse generation See Fig 2
CANL (E36-9) - GND (E36-24)	W - W-B	Lo-level CAN bus line	Ignition switch ON	Pulse generation See Fig 3
SG-3 (E36-23) - Body ground	B - Body ground	Ground for evaporator temperature sensor	Always	Below 1
PRE (E36-12) - SG-2 (E36-10)	L - G	Air conditioning pressure sensor signal	Refrigerant pressure: normal	0.76 to 4.74 V
PRE (E36-12) - SG-2 (E36-10)	L - G	Air conditioning pressure sensor signal	Refrigerant pressure: Abnormal (less than 0.196 MPa [2.0 kgf/cm² , 28 psi]	Below 0.76 V
PRE (E36-12) - SG-2 (E36-10)	L - G	Air conditioning pressure sensor signal	Refrigerant pressure: Abnormal (more than 3.14 MPa [32 kgf/cm² , 455 psi])	4.74 V or more
SG-2 (E36-10) - Body ground	B - Body ground	Ground for pressure sensor	Always	Below 1
SOL+ (E36-13) - GND (E36-24)	GR - W-B	A/C compressor operation signal	Engine idling	Pulse generation See Fig 4
			Heater control (blower switch): 1
			A/C switch ON
IG+ (E36-14) - GND (E36-24)	Y - W-B	Power source (IG)	Ignition switch ON	10 to 14 V
SBLW (E36-21) - GND (E36-24)	GR - W-B	Blower motor ON signal	Ignition switch ON	10 to 14 V --> Below 1 V
SBLW (E36-21) - GND (E36-24)	GR - W-B	Blower motor ON signal	Heater control (blower switch): 0 --> 1	10 to 14 V --> Below 1 V
TE (E36-22) - SG-3 (E36-23)	W - B	Evaporator temperature sensor signal	Ignition switch ON	1 to 1.3 V
TE (E36-22) - SG-3 (E36-23)	W - B	Evaporator temperature sensor signal	Temperature near evaporator: 15°C (59°F)	1 to 1.3 V
GND (E36-24) - Body ground	W-B - Body ground	Ground for main power supply	Always	Below 1
A/C (E36-27) - GND (E36-24)	P - W-B	A/C switch signal	Ignition switch ON	Below 1 V --> 10 to 14 V
A/C (E36-27) - GND (E36-24)	P - W-B	A/C switch signal	A/C switch OFF --> ON	Below 1 V --> 10 to 14 V
LED (E36-28) - Body ground	GR - Body ground	A/C switch indicator signal	Engine idling	10 to 14 V --> Below 4 V
			A/C switch ON
			Heater control (blower switch): 0 --> 1
LOCK (E36-3)* - SG-2 (E36-10)	W - G	Compressor lock sensor signal	Ignition switch ON A/C switch ON Magnetic clutch ON	Pulse generation See Fig 5
MGC (E36-15)* - GND (E36-24)	V - W-B	Magnetic clutch relay signal	Ignition switch ON Magnetic clutch OFF	10 to 14 V
MGC (E36-15)* - GND (E36-24)	W - B	Magnetic clutch relay signal	Ignition switch ON Magnetic clutch ON	Below 1 V

HINT:

*: for 2GR-FE

Using an oscilloscope, check WAVEFORM 1.

CAN communication signal

ITEM AND CONTENT REFERENCE (WAVEFORM 1)

Item	Content
Symbols (Terminal No.)	CANH (E36-8) - GND (E36-24)
Tool Setting	1 V/DIV., 10 msec./DIV.
Condition	Ignition switch ON

Fig 2: Waveform Graph (Waveform 1)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The waveform varies depending on the CAN communication signal.

Using an oscilloscope, check WAVEFORM 2.

CAN communication signal

ITEM AND CONTENT REFERENCE (WAVEFORM 2)

Item	Content
Symbols (Terminal No.)	CANL (E36-9) - GND (E36-24)
Tool Setting	1 V/DIV., 10 msec./DIV.
Condition	Ignition switch ON

Fig 3: Waveform Graph (Waveform 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The waveform varies depending on the CAN communication signal.

Using an oscilloscope, check WAVEFORM 3.

A/C Compressor* operation signal

ITEM AND CONTENT REFERENCE (WAVEFORM 3)

Item	Content
Symbols (Terminal No.)	SOL+ (E36-13) - GND (E36-24)
Tool Setting	5 V/DIV., 500 msec./DIV.
Condition	Engine idling, Blower switch LO, A/C switch ON

Fig 4: Waveform Graph (Waveform 3)

HINT:

*: Compressor and pulley for 2AZ-FE, compressor and magnetic clutch for 2GR-FE

Using an oscilloscope, check WAVEFORM 4.

Compressor lock sensor signal*

ITEM AND CONTENT REFERENCE (WAVEFORM 4)

Item	Content
Symbols (Terminal No.)	LOCK (E36-3)* - SG-2 (E36-10)
Tool Setting	500 mV/DIV., 20 msec./DIV.
Condition	Ignition switch ON, A/C switch ON, Magnetic clutch ON

Fig 5: Waveform Graph (Waveform 4)

HINT:

*: for 2GR-FE