Nissan Leaf. Manual - part 774

B2630, B2631 SUNLOAD SENSOR

HAC-99

< 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

NO

>> GO TO 2.

2.

CHECK SUNLOAD SENSOR POWER SUPPLY

1. Turn power switch OFF.

2. Disconnect sunload sensor connector. 

3. Turn power switch ON.

4. Check voltage between sunload sensor harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 5.

3.

CHECK SUNLOAD SENSOR GROUND CIRCUIT FOR OPEN

1. Turn power switch OFF.

2. Disconnect A/C auto amp. connector. 

3. Check continuity between sunload sensor harness connector and A/C auto amp harness connector. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

REPLACE SUNLOAD SENSOR

1. Replace sunload sensor. Refer to 

HAC-191, "Removal and Installation"

.

2. Perform DTC confirmation procedure. Refer to 

HAC-98, "DTC Logic"

.

3. Check DTC.
Is DTC detected?

YES

>> Replace A/C auto amp. Refer to 

HAC-187, "Removal and Installation"

.

NO

>> Inspection End.

5.

CHECK SUNLOAD SENSOR POWER SUPPLY CIRCUIT FOR OPEN

1. Turn power switch OFF.

2. Disconnect A/C auto amp. connector. 

3. Check continuity between sunload sensor harness connector and A/C auto amp. harness connector. 

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK SUNLOAD SENSOR POWER SUPPLY CIRCUIT FOR SHORT

Check continuity between sunload sensor harness connector and ground. 

+

−

Voltage

(Approx.)

Sunload sensor

Connector

Terminal

M74

1

Ground

5 V

Sunload sensor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M74

2

M55

30

Yes

Sunload sensor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M74

1

M55

35

Yes

HAC-100

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

B2630, B2631 SUNLOAD SENSOR

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.

Sunload sensor

—

Continuity

Connector

Terminal

M74

1

Ground

No

B2770, B2773, B2774 PTC HEATER

HAC-101

< 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

B2770, B2773, B2774 PTC HEATER

DTC Logic

INFOID:0000000010121809

DTC DETECTION 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 hot and wait at least 2 seconds.

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

6. Check DTC.
Is DTC detected?

YES

>> Refer to 

HAC-101, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010121810

DIAGNOSIS PROCEDURE

1.

REPLACE PTC HEATER

Replace PTC heater. Refer to 

HAC-201, "Removal and Installation"

.

>> Inspection End.

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B2770

PTC HEATER CIRCUIT

When PTC heater circuit system malfunction is 
detected.

• PTC heater
• High voltage harness or connectors

(PTC heater high voltage circuit is 
open or shorted.)

B2773

PTC HEATER CIRCUIT 1

When PTC heater circuit system (PTC 1) mal-
function is detected.

B2774

PTC HEATER CIRCUIT 2

When PTC heater circuit system (PTC 2) mal-
function is detected.

HAC-102

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

B2771 PTC HEATER

B2771 PTC HEATER

DTC Logic

INFOID:0000000010121811

DTC DETECTION 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 hot and wait at least 2 seconds.

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

6. Check DTC.
Is DTC detected?

YES

>> Refer to 

HAC-102, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010121812

1.

CHECK BLOWER MOTOR SYSTEM

Check the blower motor system. Refer to 

HAC-175, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace malfunctioning components.

2.

CHECK AIR MIX DOOR MOTOR SYSTEM

Check the air mix door motor system. Refer to 

HAC-110, "Diagnosis Procedure"

Is the inspection result normal?

YES

>> Replace PTC heater. Refer to 

HAC-201, "Removal and Installation"

.

NO

>> Repair or replace malfunctioning components.

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B2771

PTC HEATER OVERHEAT 
PROTECT

When the PTC heater circuit board internal tem-
perature is 115

°C (239°F) or more.

• PTC heater
• Blower motor system
• Air mix door motor system