Nissan Leaf. Manual - part 786

 

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Nissan Leaf. Manual - part 786

 

 

B27C4, B27C5 A/C UNIT CASE TEMPERATURE SENSOR

HAC-147

< 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

Check continuity between PTC heater outlet air and A/C unit case temperature sensor assembly harness con-

nector 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:0000000010121855

1.

CHECK A/C CASE UNIT TEMPERATURE SENSOR

1. Remove PTC heater outlet air and A/C unit case temperature sensor assembly. Refer to 

HAC-198,

"Removal and Installation"

2. Check resistance between PTC heater outlet air and A/C unit case temperature sensor assembly termi-

nals. Refer to applicable table for the normal value. 

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace PTC heater outlet air and A/C unit case temperature sensor assembly. Refer to 

HAC-

198, "Removal and Installation"

.

PTC heater outlet air and A/C unit case temperature sensor as-

sembly

Continuity

Connector

Terminal

M138

4

Ground

No

Terminal

Condition

Resistance: k

Temperature: 

°C (°F) 

3

4

0 (32) 

6.00

10 (50)

3.87

20 (68)

2.57

30 (86)

1.76

40 (104)

1.23

60 (140)

0.64

80 (176)

0.36

100 (212)

0.22

HAC-148

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

B27C6, B27C7 COMPRESSOR DISCHARGE REFRIGERANT TEMPERATURE 

SENSOR

B27C6, B27C7 COMPRESSOR DISCHARGE REFRIGERANT TEMPERA-
TURE SENSOR

DTC Logic

INFOID:0000000010121856

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-148, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010121857

Regarding Wiring Diagram information, refer to 

HAC-61, "Wiring Diagram"

.

1.

CHECK COMPRESSOR DISCHARGE 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

B27C6

COMP DISCHG TEMP 
SENS

The compressor discharge refrigerant tempera-
ture sensor recognition temperature is too low 
[less than -6.9

°C (19.6°F)].

• Compressor discharge refrigerant 

temperature sensor

• A/C auto amp.
• Harness or connectors

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

B27C7

The compressor discharge refrigerant tempera-
ture sensor recognition temperature is too high 
[more than 283.4

°C (542.1°F)].

Heat pump control unit

Test condition

Voltage signal

connector

+

Terminal

M102

2

16

• Power switch ON
• When air conditioner is op-

erating

JSIIA1779ZZ

B27C6, B27C7 COMPRESSOR DISCHARGE REFRIGERANT TEMPERATURE 

SENSOR

HAC-149

< 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

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 2.

2.

CHECK COMPRESSOR DISCHARGE REFRIGERANT TEMPERATURE SENSOR POWER SUPPLY

1. Turn power switch OFF.

2. Disconnect compressor discharge refrigerant temperature sensor connector. 

3. Turn power switch ON.

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

ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 5.

3.

CHECK COMPRESSOR DISCHARGE REFRIGERANT TEMPERATURE SENSOR GROUND CIRCUIT

FOR OPEN

1. Turn power switch OFF.

2. Disconnect A/C auto amp. connector. 

3. Check continuity between compressor discharge 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 DISCHARGE REFRIGERANT TEMPERATURE SENSOR

Check compressor discharge refrigerant temperature sensor. Refer to 

HAC-150, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to 

HAC-187, "Removal and Installation"

.

NO

>> Replace compressor discharge refrigerant temperature sensor. Refer to 

HAC-195, "Removal and

Installation"

.

5.

CHECK COMPRESSOR DISCHARGE 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 discharge 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 DISCHARGE REFRIGERANT TEMPERATURE SENSOR POWER SUPPLY CIR-

+

Voltage

(Approx.)

Compressor discharge refrigerant temperature sensor

Connector

Terminal

M137

1

Ground

5 V

Compressor discharge refrigerant temperature sensor

Heat pump control unit

Continuity

Connector

Terminal

Connector

Terminal

M137

2

M102

8

Yes

Compressor discharge refrigerant temperature sensor

Heat pump control unit

Continuity

Connector

Terminal

Connector

Terminal

M137

1

M102

2

Yes

HAC-150

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

B27C6, B27C7 COMPRESSOR DISCHARGE REFRIGERANT TEMPERATURE 

SENSOR

CUIT FOR SHORT
Check continuity between compressor discharge 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:0000000010121858

1.

CHECK COMPRESSOR DISCHARGE REFRIGERANT TEMPERATURE SENSOR

1. Remove compressor discharge refrigerant temperature sensor. Refer to 

HAC-195, "Removal and Installa-

tion"

2. Check resistance between compressor discharge refrigerant temperature sensor terminals. Refer to appli-

cable table for the normal value. 

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace compressor discharge refrigerant temperature sensor. Refer to 

HAC-195, "Removal and

Installation"

.

Compressor discharge refrigerant temperature sensor

Continuity

Connector

Terminal

M137

1

Ground

No

Terminal

Condition

Resistance: k

Temperature: 

°C (°F) 

1

2

0 (32) 

16.43

10 (50)

9.90

20 (68)

6.19

30 (86)

4.01

40 (104)

2.67

60 (140)

2.20

80 (176)

1.83

100 (212)

1.28

 

 

 

 

 

 

 

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