Nissan Leaf. Manual - part 787

 

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Nissan Leaf. Manual - part 787

 

 

B27C8, B27C9 COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SEN-

SOR

HAC-151

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

B27C8, B27C9 COMPRESSOR SUCTION REFRIGERANT TEMPERATURE
SENSOR

DTC Logic

INFOID:0000000010121859

DTC DETECTION LOGIC 

NOTE:

• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to 

HAC-

87, "DTC Logic"

.

• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. 

HAC-88,

"DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn power switch OFF.

2. Set the vehicle to READY.

3. Operate the automatic air conditioning system.

4. Set the temperature to full cold and wait at least 1 second.

5. Select “Self Diagnostic Result” of “HVAC” using CONSULT.

6. Check DTC.
Is DTC detected?

YES

>> Refer to 

HAC-151, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010121860

Regarding Wiring Diagram information, refer to 

HAC-61, "Wiring Diagram"

.

1.

CHECK COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SENSOR VOLTAGE SIGNAL

1. Turn power switch ON.

2. Operate the automatic air conditioning system.

3. Check voltage between heat pump control unit harness connector terminals.

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B27C8

COMP SUCTION TEMP 
SENS

The compressor suction refrigerant tempera-
ture sensor recognition temperature is too low 
[less than 

−66°C (−86.8°F)].

• Compressor suction refrigerant 

temperature sensor

• A/C auto amp.
• Harness or connectors

(The sensor circuit is open or short-
ed.)

B27C9

The compressor suction refrigerant tempera-
ture sensor recognition temperature is too high 
[more than 138.4

°C (281.1°F)].

Heat pump control unit

Test condition

Voltage signal

connector

+

Terminal

M102

11

16

• Power  switch  ON
• When air conditioner is op-

erating

JSIIA1780ZZ

HAC-152

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

B27C8, B27C9 COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SEN-

SOR

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 2.

2.

CHECK COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SENSOR POWER SUPPLY

1. Turn power switch OFF.

2. Disconnect compressor suction refrigerant temperature sensor connector. 

3. Turn power switch ON.

4. Check voltage between compressor suction refrigerant temperature sensor harness connector and

ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 5.

3.

CHECK COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SENSOR GROUND CIRCUIT FOR

OPEN
1. Turn power switch OFF.

2. Disconnect heat pump control unit connector. 

3. Check continuity between compressor suction refrigerant temperature sensor harness connector and

heat pump control unit harness connector. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SENSOR

Check compressor suction refrigerant temperature sensor. Refer to 

HAC-153, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-187, "Removal and Installation"

.

NO

>> Replace compressor suction refrigerant temperature sensor. Refer to 

HAC-196, "Removal and

Installation"

.

5.

CHECK COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SENSOR POWER SUPPLY CIR-

CUIT FOR OPEN
1. Turn power switch OFF.

2. Disconnect heat pump control unit connector. 

3. Check continuity between compressor suction refrigerant temperature sensor harness connector and

heat pump control unit harness connector.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SENSOR POWER SUPPLY CIR-

+

Voltage

(Approx.)

Compressor suction refrigerant temperature sensor

Connector

Terminal

E89

1

Ground

5 V

Compressor suction refrigerant temperature sensor

Heat pump control unit

Continuity

Connector

Terminal

Connector

Terminal

E89

2

M102

8

Yes

Compressor suction refrigerant temperature sensor

Heat pump control unit

Continuity

Connector

Terminal

Connector

Terminal

E89

1

M102

11

Yes

B27C8, B27C9 COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SEN-

SOR

HAC-153

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

CUIT FOR SHORT

Check continuity between compressor suction refrigerant temperature sensor harness connector and ground. 

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-187, "Removal and Installation"

.

NO

>> Repair harness or connector.

7.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-187, "Removal and Installation"

.

NO

>> Repair or replace malfunctioning components.

Component Inspection

INFOID:0000000010121861

1.

CHECK COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SENSOR

1. Remove compressor suction refrigerant temperature sensor. Refer to 

HAC-196, "Removal and Installa-

tion"

2. Check resistance between compressor suction refrigerant temperature sensor terminals. Refer to applica-

ble table for the normal value. 

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace compressor suction refrigerant temperature sensor. Refer to 

HAC-196, "Removal and

Installation"

.

Compressor suction refrigerant temperature sensor

Continuity

Connector

Terminal

E89

1

Ground

No

Terminal

Condition

Resistance: k

Temperature: 

°C (°F) 

1

2

 

−20 (−4)

15.9

 

−10 (14)

9.6

0 (32) 

6.0

10 (50)

3.9

20 (68)

2.6

40 (104)

1.2

60 (140)

0.7

80 (176)

0.4

HAC-154

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

B27F0 REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE

B27F0 REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE

DTC Logic

INFOID:0000000010121862

DTC DETECTION LOGIC 

NOTE:

• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to 

HAC-

87, "DTC Logic"

.

• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. 

HAC-88,

"DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn power switch OFF.

2. Set the vehicle to READY.

3. Operate the automatic air conditioning system.

4. Set the temperature to full cold and wait at least 5 seconds.

5. Select “Self Diagnostic Result” of “HVAC” using CONSULT.

6. Check DTC.
Is DTC detected?

YES

>> Refer to 

HAC-154, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010121863

Regarding Wiring Diagram information, refer to 

HAC-61, "Wiring Diagram"

.

NOTE:

After diagnosis is completed, reconnect all harness connectors. Then, use CONSULT to enter “Active Test” of

“HVAC”, and perform “MODE2” (cooling operation) and “MODE5” (heating operation) of “HVAC TEST” for the

maximum of 10 minutes. (Refer to 

HAC-47, "CONSULT Function"

.) Check that cool air blows during cooling

operation, and that warm air blows during heating operation.

1.

CHECK REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE CONTROL CIRCUIT FOR OPEN

1. Turn power switch OFF.

2. Disconnect refrigerant channel switching 2 way type valve connector and heat pump control unit connec-

tor.

3. Check continuity between refrigerant channel switching 2 way type valve harness connector and heat

pump control unit harness connector.

NOTE:

Check for any adhering foreign substances, cracking, or damage on the refrigerant channel switching 2

way type valve terminal and heat pump control unit harness connector terminal.

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B27F0

2-WAY TYPE VALVE CIRC

When the heat pump control unit detects a mal-
function of the refrigerant channel switching 2 
way type valve control signal status, compared 
to the valve status of the control that is being 
judged.

• Refrigerant channel switching 2 

way type valve

• Heat pump control unit
• Harness or connectors

(The heat pump control unit circuit 
or refrigerant channel switching 2 
way type valve circuit is open or 
shorted.)

 

 

 

 

 

 

 

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