Nissan Leaf. Manual - part 826

B278A, B278B ELECTRIC COMPRESSOR

HAC-307

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITHOUT HEAT PUMP)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

B278A, B278B ELECTRIC COMPRESSOR

DTC Logic

INFOID:0000000010122020

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 cold 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-307, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010122021

DANGER:

Since hybrid vehicles and electric vehicles contain a high voltage battery, there is the risk of

electric shock, electric leakage, or similar accidents if the high voltage component and vehicle are

handled incorrectly. Be sure to follow the correct work procedures when performing inspection and

maintenance.

WARNING:

• Be sure to remove the service plug in order to disconnect the high voltage circuits before perform-

ing inspection or maintenance of high voltage system harnesses and parts.

• The removed service plug must always be carried in a pocket of the responsible worker or placed in

the tool box during the procedure to prevent the plug from being connected by mistake.

• Be sure to wear insulating protective equipment consisting of glove, shoes, face shield and glasses

before beginning work on the high voltage system.

• Never allow workers other than the responsible person to touch the vehicle containing high voltage

parts. To keep others from touching the high voltage parts, these parts must be covered with an insu-

lating sheet except when using them.

• Refer to 

GI-34, "High Voltage Precautions"

.

CAUTION:

Never bring the vehicle into the READY status with the service plug removed unless otherwise

instructed in the Service Manual. A malfunction may occur if this is not observed.

Regarding Wiring Diagram information, refer to 

HAC-253, "Wiring Diagram"

.

DIAGNOSIS PROCEDURE

CAUTION:

Erase DTC after the work is completed.

1.

PRECONDITIONING

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B278A

COMP LOW VOLTAGE

When the high voltage system input voltage is 
less than 230 V.

• Electric compressor
• Li-ion battery
• PDM
• High voltage harness or connectors

(Electric compressor high voltage 
circuit is open or shorted.)

B278B

COMP HIGH VOLTAGE

When the high voltage system input voltage is 
more than 420 V.

HAC-308

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITHOUT HEAT PUMP)]

B278A, B278B ELECTRIC COMPRESSOR

WARNING:

Disconnect the high voltage. Refer to 

GI-33, "How to Disconnect High Voltage"

.

Check voltage in high voltage circuit. (Check that condenser are discharged.)

1. Lift up the vehicle and remove the Li-ion battery under covers. Refer to 

EVB-181, "Exploded View"

.

2. Disconnect high voltage harness connector and PTC heater harness connector from front side of Li-ion

battery. Refer to 

EVB-181, "Removal and Installation"

.

3. Measure voltage between high voltage harness connector terminals and PTC heater harness connector

terminals.

DANGER:

 

 Touching high voltage components without using the appropriate protective equipment will

cause electrocution.

CAUTION:

For voltage measurements, use a tester which can measure to 500 V or higher.

>> GO TO 2.

2.

CHECK LI-ION BATTERY

1. Connect 12V battery negative terminal.

2. Check Li-ion battery. Refer to 

EVB-69, "Work Flow"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace malfunctioning components.

3.

CHECK PDM (POWER DELIVERY MODULE)

Check PDM (power delivery module). Refer to 

EVC-125, "Work Flow"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace malfunctioning components.

4.

CHECK ELECTRIC COMPRESSOR HIGH VOLTAGE HARNESS POWER SUPPLY CIRCUIT FOR OPEN

1. Disconnect electric compressor and Li-ion battery connector.

2. Check continuity between electric compressor high voltage harness connector and Li-ion battery high volt-

age harness connector.

Is the inspection result normal?

YES

>> GO TO 5.

Standard

: 5 V or less 

JPCIA0296ZZ

Electric compressor

Li-ion battery

Continuity

Connector

Terminal

Connector

Terminal

H1

1

H3

37

Yes

B278A, B278B ELECTRIC COMPRESSOR

HAC-309

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITHOUT HEAT PUMP)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

NO

>> Replace high voltage harness between electric compressor and PDM (power delivery module),

and between PDM (power delivery module) and Li-ion battery.

5.

CHECK ELECTRIC COMPRESSOR HIGH VOLTAGE HARNESS GROUND CIRCUIT

Check continuity between electric compressor high voltage harness connector and Li-ion battery high voltage

harness connector.

Is the inspection result normal?

YES

>> Replace electric compressor. Refer to 

HA-95, "Removal and Installation"

.

NO

>> Replace high voltage harness between electric compressor and PDM (power delivery module),

and between PDM (power delivery module) and Li-ion battery.

Electric compressor

Li-ion battery

Continuity

Connector

Terminal

Connector

Terminal

H1

2

H3

38

Yes

HAC-310

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITHOUT HEAT PUMP)]

B278C, B278D ELECTRIC COMPRESSOR

B278C, B278D ELECTRIC COMPRESSOR

DTC Logic

INFOID:0000000010122022

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

4. Check DTC.
Is DTC detected?

YES

>> Refer to 

HAC-310, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010122023

DANGER:

Since hybrid vehicles and electric vehicles contain a high voltage battery, there is the risk of

electric shock, electric leakage, or similar accidents if the high voltage component and vehicle are

handled incorrectly. Be sure to follow the correct work procedures when performing inspection and

maintenance.

WARNING:

• Be sure to remove the service plug in order to disconnect the high voltage circuits before perform-

ing inspection or maintenance of high voltage system harnesses and parts.

• The removed service plug must always be carried in a pocket of the responsible worker or placed in

the tool box during the procedure to prevent the plug from being connected by mistake.

• Be sure to wear insulating protective equipment consisting of glove, shoes, face shield and glasses

before beginning work on the high voltage system.

• Never allow workers other than the responsible person to touch the vehicle containing high voltage

parts. To keep others from touching the high voltage parts, these parts must be covered with an insu-

lating sheet except when using them.

• Refer to 

GI-34, "High Voltage Precautions"

.

CAUTION:

Never bring the vehicle into the READY status with the service plug removed unless otherwise

instructed in the Service Manual. A malfunction may occur if this is not observed.

Regarding Wiring Diagram information, refer to 

HAC-253, "Wiring Diagram"

.

DIAGNOSIS PROCEDURE

CAUTION:

Erase DTC after the work is completed.

1.

PRECONDITIONING

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B278C

COMP COMM ERROR 
HVAC

→COMP

When the electric compressor cannot receive 
the signal sent from the A/C auto amp.

• Electric compressor
• A/C auto amp.
• Harness or connectors

(Electric compressor circuit is open 
or shorted.)

• High voltage harness or connectors

(Electric compressor high voltage 
circuit is open or shorted.)

B278D

COMP COMM ERROE 
COMP

→HVAC

When the A/C auto amp. cannot receive the sig-
nal sent from the electric compressor.