Nissan Leaf. Instruction — part 827
B278C, B278D ELECTRIC COMPRESSOR
HAC-311
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITHOUT HEAT PUMP)]
C
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HAC
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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 ELECTRIC COMPRESSOR COMMUNICATION LINE FOR OPEN
1. Turn power switch OFF.
2. Disconnect electric compressor and A/C auto amp. connector.
3. Check continuity between electric compressor harness connector and A/C auto amp. harness connector.
NOTE:
Check for any adhering foreign substances, cracking, or damage on the electric compressor terminal and
A/C auto amp. harness connector terminal.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK ELECTRIC COMPRESSOR COMMUNICATION LINE FOR SHORT
Check continuity between electric compressor harness connector and ground.
Standard
: 5 V or less
JPCIA0296ZZ
Electric compressor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
F10
7
M55
14
Yes
9
18
Electric compressor
Ground
Continuity
Connector
Terminal
F10
7
No
9
HAC-312
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITHOUT HEAT PUMP)]
B278C, B278D ELECTRIC COMPRESSOR
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK ELECTRIC COMPRESSOR POWER SUPPLY
1. Disconnect electric compressor connector.
2. Turn power switch ON.
3. Check voltage between electric compressor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 6.
5.
CHECK ELECTRIC COMPRESSOR GROUND CIRCUIT
1. Turn power switch OFF.
2. Check continuity between electric compressor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
6.
CHECK A/C RELAY CIRCUIT
Check A/C relay circuit. Refer to
EVC-385, "Diagnosis Procedure"
.
Is the inspection result normal?
YES
>> Repair harness or connector between A/C relay and electric compressor.
NO
>> Repair or replace malfunctioning components.
7.
CHECK PDM (POWER DELIVERY MODULE)
Check PDM (power delivery module). Refer to
.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair or replace malfunctioning components.
8.
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 9.
NO
>> Replace high voltage harness between electric compressor and PDM (power delivery module),
and between PDM (power delivery module) and Li-ion battery.
9.
CHECK ELECTRIC COMPRESSOR HIGH VOLTAGE HARNESS GROUND CIRCUIT
+
−
Voltage
(Approx.)
Electric compressor
Connector
Terminal
F10
10
Ground
Battery voltage
Electric compressor
Ground
Continuity
Connector
Terminal
F10
8
Yes
Electric compressor
Li-ion battery
Continuity
Connector
Terminal
Connector
Terminal
H1
1
H3
37
Yes
B278C, B278D ELECTRIC COMPRESSOR
HAC-313
< 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
Check continuity between electric compressor high voltage harness connector and Li-ion battery high voltage
harness connector.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Replace high voltage harness between electric compressor and PDM (power delivery module),
and between PDM (power delivery module) and Li-ion battery.
10.
CHECK A/C AUTO AMP.
With CONSULT
1. Reconnect all harness connectors disconnected.
2. Set the vehicle to READY.
3. Using CONSULT, perform “MODE1” of “HVAC TEST” in “Active Test” of “HVAC”. Refer to
.
4. Check that the electric compressor operates normally.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace A/C auto amp. Refer to
HAC-347, "Removal and Installation"
. Then GO TO 11.
11.
PERFORM DTC CONFIRMATION PROCEDURE
Perform DTC confirmation procedure. Refer to
.
Is DTC B278C detected?
YES
>> Replace electric compressor. Refer to
HA-95, "Removal and Installation"
.
NO
>> Inspection End.
Electric compressor
Li-ion battery
Continuity
Connector
Terminal
Connector
Terminal
H1
2
H3
38
Yes
HAC-314
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITHOUT HEAT PUMP)]
B2791 ELECTRIC COMPRESSOR
B2791 ELECTRIC COMPRESSOR
DTC Logic
INFOID:0000000010122024
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-314, "Diagnosis Procedure"
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010122025
1.
CHECK REFRIGERANT FOR LEAKAGES
Check refrigerant for leakages. Refer to
HA-84, "Check Refrigerant Leakage"
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace malfunctioning parts.
2.
CHECK COOLING FAN OPERATION
1. Set the vehicle to READY.
2. Operate the automatic air conditioning system.
3. Check that the cooling fan is operating.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Check cooling fan. Refer to
EVC-367, "Component Function Check"
.
3.
CHECK REFRIGERANT CYCLE
Check refrigerant cycle. Refer to
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace malfunctioning parts.
4.
CHECK LI-ION BATTERY
Check Li-ion battery. Refer to
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace malfunctioning parts.
5.
CHECK PDM (POWER DELIVERY MODULE)
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible cause
B2791
COMP LOW SPEED HIGH
LOAD
When the driving load of the electric compres-
sor reaches a maximum value during slow rota-
tion.
• Electric compressor
• Cooling fan
• Li-ion battery
• PDM
• Overfilled refrigerant
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