HEAT PUMP CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]

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1. Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.)

2. Remove the heat pump control unit with the connector connected.

3. Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.)

4. Connect the negative lead of the tester to the body ground.

5. Insert the positive lead into the heat pump control unit and measure the voltage of each terminal following the terminal voltage table.

• If the voltage is not as specified in the Terminal Voltage Table (Reference), inspect the parts under “Inspection item(s)” and related wiring harnesses.

― If the system does not work properly even though the inspection items or related wiring harnesses do not have any malfunction, replace the heat pump control unit. (See HEAT PUMP CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

Terminal voltage table (reference)

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Terminal

Signal name

Connection

Measurement condition

Voltage (V)

Inspection items

A

IG

A/C relay

Main power is switched to ACC or ON (READY off)

V_B

•  Lead-acid battery

•  F11 7.5A fuse

•  A/C relay

•  Related wiring harness

Main power is switched OFF

1.0 or less

B

BATT

F11 7.5A fuse

Continuous

V_B

•  Lead-acid battery

•  F11 7.5A fuse

C

CAN_H

CAN related module

Because this terminal is for communication, examination using terminal voltage inspection is not possible. Perform inspection using the DTC inspection.

•  Related wiring harness

D

—

—

—

—

—

E

CAN_L

CAN related module

Because this terminal is for communication, examination using terminal voltage inspection is not possible. Perform inspection using the DTC inspection.

•  Related wiring harness

F

GND1

Body ground

Continuous

Approx. 0

•  GND point

•  Related wiring harness

G

—

—

—

—

—

H

—

—

—

—

—

I

CL_MGVLV_2WAY

2way valve for refrigerant

Connect the M-MDS and turn on the [2_WAY_VLV] using the heat pump control unit simulation function.

1.0 or less

•  2way valve for refrigerant

•  Related wiring harness

Connect the M-MDS and turn off the [2_WAY_VLV] using the heat pump control unit simulation function.

V_B

J

—

—

—

—

—

K

HT_MGVLV_3WAY

3way valve for refrigerant

Connect the M-MDS and turn on the [3_WAY_VLV] using the heat pump control unit simulation function.

1.0 or less

•  3way valve for refrigerant

•  Related wiring harness

Connect the M-MDS and turn off the [3_WAY_VLV] using the heat pump control unit simulation function.

V_B

L

—

—

—

—

—

M

—

—

—

—

—

N

—

—

—

—

—

O

—

—

—

—

—

P

—

—

—

—

—

Q

—

—

—

—

—

R

—

—

—

—

—

S

SUCS_TEMP_SSR

Temperature sensor of refrigerant line for condenser outlet

—

Voltage cannot be measured.

•  Temperature sensor of refrigerant line for condenser outlet

•  Related wiring harness

T

—

—

—

—

—

U

EVA_OUT_TEMP_SSR

temperature sensor of refrigerant line for evaporator outlet

—

Voltage cannot be measured.

•  Temperature sensor of refrigerant line for evaporator outlet

•  Related wiring harness

V

GND_SSR

•  Temperature sensor of refrigerant line for condenser outlet

•  Temperature sensor of refrigerant line for evaporator outlet

Continuous

1.0 or less

•  Temperature sensor of refrigerant line for condenser outlet

•  Temperature sensor of refrigerant line for evaporator outlet

•  Related wiring harness

W

—

—

—

—

—

X

GND2

Body ground

Continuous

Approx. 0

•  GND point

•  Related wiring harness

Y

—

—

—

—

—

Z

CL_ExpVLV_B2

Electric expansion valve

—

Voltage cannot be measured.

•  Electric expansion valve

•  Related wiring harness

AA

—

—

—

—

—

AB

CL_ExpVLV_B1

Electric expansion valve

—

Voltage cannot be measured.

•  Electric expansion valve

•  Related wiring harness

AC

—

—

—

—

—

AD

CL_ExpVLV_A2

Electric expansion valve

—

Voltage cannot be measured.

•  Electric expansion valve

•  Related wiring harness

AE

—

—

—

—

—

AF

CL_ExpVLV_A1

Electric expansion valve

—

Voltage cannot be measured.

•  Electric expansion valve

•  Related wiring harness

Terminal	Signal name	Connection	Measurement condition	Voltage (V)	Inspection items
A	IG	A/C relay	Main power is switched to ACC or ON (READY off)	V_B	• Lead-acid battery • F11 7.5A fuse • A/C relay • Related wiring harness
A	IG	A/C relay	Main power is switched OFF	1.0 or less
B	BATT	F11 7.5A fuse	Continuous	V_B	• Lead-acid battery • F11 7.5A fuse
C	CAN_H	CAN related module	Because this terminal is for communication, examination using terminal voltage inspection is not possible. Perform inspection using the DTC inspection.		• Related wiring harness
D	—	—	—	—	—
E	CAN_L	CAN related module	Because this terminal is for communication, examination using terminal voltage inspection is not possible. Perform inspection using the DTC inspection.		• Related wiring harness
F	GND1	Body ground	Continuous	Approx. 0	• GND point • Related wiring harness
G	—	—	—	—	—
H	—	—	—	—	—
I	CL_MGVLV_2WAY	2way valve for refrigerant	Connect the M-MDS and turn on the [2_WAY_VLV] using the heat pump control unit simulation function.	1.0 or less	• 2way valve for refrigerant • Related wiring harness
I	CL_MGVLV_2WAY	2way valve for refrigerant	Connect the M-MDS and turn off the [2_WAY_VLV] using the heat pump control unit simulation function.	V_B	• 2way valve for refrigerant • Related wiring harness
J	—	—	—	—	—
K	HT_MGVLV_3WAY	3way valve for refrigerant	Connect the M-MDS and turn on the [3_WAY_VLV] using the heat pump control unit simulation function.	1.0 or less	• 3way valve for refrigerant • Related wiring harness
K	HT_MGVLV_3WAY	3way valve for refrigerant	Connect the M-MDS and turn off the [3_WAY_VLV] using the heat pump control unit simulation function.	V_B	• 3way valve for refrigerant • Related wiring harness
L	—	—	—	—	—
M	—	—	—	—	—
N	—	—	—	—	—
O	—	—	—	—	—
P	—	—	—	—	—
Q	—	—	—	—	—
R	—	—	—	—	—
S	SUCS_TEMP_SSR	Temperature sensor of refrigerant line for condenser outlet	—	Voltage cannot be measured.	• Temperature sensor of refrigerant line for condenser outlet • Related wiring harness
T	—	—	—	—	—
U	EVA_OUT_TEMP_SSR	temperature sensor of refrigerant line for evaporator outlet	—	Voltage cannot be measured.	• Temperature sensor of refrigerant line for evaporator outlet • Related wiring harness
V	GND_SSR	• Temperature sensor of refrigerant line for condenser outlet • Temperature sensor of refrigerant line for evaporator outlet	Continuous	1.0 or less	• Temperature sensor of refrigerant line for condenser outlet • Temperature sensor of refrigerant line for evaporator outlet • Related wiring harness
W	—	—	—	—	—
X	GND2	Body ground	Continuous	Approx. 0	• GND point • Related wiring harness
Y	—	—	—	—	—
Z	CL_ExpVLV_B2	Electric expansion valve	—	Voltage cannot be measured.	• Electric expansion valve • Related wiring harness
AA	—	—	—	—	—
AB	CL_ExpVLV_B1	Electric expansion valve	—	Voltage cannot be measured.	• Electric expansion valve • Related wiring harness
AC	—	—	—	—	—
AD	CL_ExpVLV_A2	Electric expansion valve	—	Voltage cannot be measured.	• Electric expansion valve • Related wiring harness
AE	—	—	—	—	—
AF	CL_ExpVLV_A1	Electric expansion valve	—	Voltage cannot be measured.	• Electric expansion valve • Related wiring harness