Nissan Leaf. Instruction — part 772

B2578, B2579 IN-VEHICLE SENSOR

HAC-91

< 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

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:0000000010121800

1.

CHECK IN-VEHICLE SENSOR

1. Remove in-vehicle sensor. Refer to

HAC-190, "Removal and Installation"

.

2. Check resistance between in-vehicle sensor terminals. Refer to applicable table for the normal value.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace in-vehicle sensor. Refer to

HAC-190, "Removal and Installation"

.

Terminal

Condition

Resistance: k

Ω

Temperature:

°C (°F)

1

2

−20 (−4)

16.43

−10 (14)

9.90

0 (32)

6.19

10 (50)

4.01

20 (68)

2.67

25 (77)

2.20

30 (86)

1.83

40 (104)

1.28

HAC-92

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

B257B, B257C AMBIENT SENSOR

B257B, B257C AMBIENT SENSOR

DTC Logic

INFOID:0000000010121801

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 ON.

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

3. Check DTC.
Is DTC detected?

YES

>> Refer to

HAC-92, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010121802

Regarding Wiring Diagram information, refer to

HAC-61, "Wiring Diagram"

.

1.

CHECK AMBIENT SENSOR VOLTAGE SIGNAL

1. Turn power switch ON.

2. Operate the automatic air conditioning system.

3. Check voltage signal between A/C auto amp. harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 2.

2.

CHECK AMBIENT SENSOR POWER SUPPLY

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B257B

AMBIENT SENSOR

The ambient sensor recognition temperature is
too high [more than 100

°C (212°F)].

• Ambient sensor
• A/C auto amp.
• Harness or connectors

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

B257C

The ambient sensor recognition temperature is
too low [less than

−42°C (−44°F)].

A/C auto amp.

Test condition

Voltage signal

Connector

+

−

Terminal

M55

36

10

• Power switch ON
• When air conditioner is op-

erating

JSIIA1665ZZ

B257B, B257C AMBIENT SENSOR

HAC-93

< 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

1. Turn power switch OFF.

2. Disconnect ambient sensor connector.

3. Turn power switch ON.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 5.

3.

CHECK AMBIENT SENSOR GROUND CIRCUIT FOR OPEN

1. Turn power switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between ambient 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.

CHECK AMBIENT SENSOR

Check ambient sensor. Refer to

HAC-94, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp. Refer to

HAC-187, "Removal and Installation"

.

NO

>> Replace ambient sensor. Refer to

HAC-189, "Removal and Installation"

.

5.

CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR OPEN

1. Turn power switch OFF.

2. Disconnect A/C auto amp. connector.

3. Check continuity between ambient 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 AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR SHORT

Check continuity between ambient 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.

+

−

Voltage

(Approx.)

Ambient sensor

Connector

Terminal

E53

1

Ground

5 V

Ambient sensor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

E53

2

M55

30

Yes

Ambient sensor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

E53

1

M55

36

Yes

Ambient sensor

—

Continuity

Connector

Terminal

E53

1

Ground

No

HAC-94

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

B257B, B257C AMBIENT SENSOR

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:0000000010121803

1.

CHECK AMBIENT SENSOR

1. Remove ambient sensor. Refer to

HAC-189, "Removal and Installation"

.

2. Check resistance between ambient sensor terminals. Refer to applicable table for the normal value.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace ambient sensor. Refer to

HAC-189, "Removal and Installation"

.

Terminal

Condition

Resistance: k

Ω

Temperature:

°C (°F)

1

2

−20 (−4)

16.50

−10 (14)

9.92

0 (32)

6.19

10 (50)

3.99

20 (68)

2.65

25 (77)

2.19

30 (86)

1.81

40 (104)

1.27