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
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
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
.
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
.
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
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.
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