Nissan Leaf. Instruction — part 789
B27F1 REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE
HAC-159
< 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 heat pump control unit connector and A/C auto amp. connector.
3. Check continuity between heat pump control unit harness connector and A/C auto amp. harness connec-
tor.
NOTE:
Check for any adhering foreign substances, cracking, or damage on the heat pump control unit terminal
and A/C auto amp. harness connector terminal.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK HEAT PUMP CONTROL UNIT COMMUNICATION LINE FOR SHORT
Check continuity between heat pump control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair harness or connector.
8.
CHECK REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE
Check refrigerant channel switching 2 way type valve. Refer to
HAC-156, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Replace high-pressure cooler pipe assembly. Refer to
HA-47, "2-WAY VALVE AND 3-WAY VALVE
ASSEMBLY : Removal and Installation"
.
9.
PERFORM DTC CONFIRMATION PROCEDURE
Perform DTC confirmation procedure. Refer to
.
Is DTC B27F1 detected?
YES
>> Replace heat pump control unit. Refer to
HAC-188, "Removal and Installation"
NO
>> Check intermittent incident. Refer to
GI-53, "Intermittent Incident"
.
Heat pump control unit
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M102
1
M55
40
Yes
Heat pump control unit
—
Continuity
Connector
Terminal
M102
1
Ground
No
HAC-160
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
B27F2 REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE
B27F2 REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE
DTC Logic
INFOID:0000000010121867
DTC DETECTION LOGIC
NOTE:
• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010.
.
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 5 seconds.
5. Select “Self Diagnostic Result” of “HVAC” using CONSULT.
6. Check DTC.
Is DTC detected?
YES
>> Refer to
HAC-160, "Diagnosis Procedure"
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010121868
Regarding Wiring Diagram information, refer to
NOTE:
After diagnosis is completed, reconnect all harness connectors. Then, use CONSULT to enter “Active Test” of
“HVAC”, and perform “MODE2” (cooling operation) and “MODE5” (heating operation) of “HVAC TEST” for the
maximum of 10 minutes. (Refer to
.) Check that cool air blows during cooling
operation, and that warm air blows during heating operation.
1.
CHECK REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE CONTROL CIRCUIT FOR OPEN
1. Turn power switch OFF.
2. Disconnect refrigerant channel switching 2 way type valve connector and heat pump control unit connec-
tor.
3. Check continuity between refrigerant channel switching 2 way type valve harness connector and heat
pump control unit harness connector.
NOTE:
Check for any adhering foreign substances, cracking, or damage on the refrigerant channel switching 2
way type valve terminal and heat pump control unit harness connector terminal.
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible cause
B27F2
2-WAY TYPE VALVE CIRC
When the heat pump control unit detects a mal-
function of the refrigerant channel switching 2
way type valve control signal status, compared
to the valve status of the control that is being
judged.
• Refrigerant channel switching 2
way type valve
• Heat pump control unit
• Harness or connectors
(The heat pump control unit circuit
or refrigerant channel switching 2
way type valve circuit is open or
shorted.)
B27F2 REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE
HAC-161
< 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
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair harness or connector.
2.
CHECK REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE CONTROL CIRCUIT FOR SHORT
(BATTERY)
1. Turn power switch ON.
2. Check continuity between heat pump control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE CONTROL CIRCUIT FOR SHORT
(GROUND)
1. Turn power switch OFF.
2. Check continuity between heat pump control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE POWER SUPPLY
1. Turn power switch ON.
2. Check continuity between refrigerant channel switching 2 way type valve harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
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 refrigerant channel switching 2 way type
valve.
NO
>> Repair or replace malfunctioning components.
6.
CHECK HEAT PUMP CONTROL UNIT COMMUNICATION LINE FOR OPEN
Refrigerant channel switching 2 way type valve
Heat pump control unit
Continuity
Connector
Terminal
Connector
Terminal
E90
2
M102
6
Yes
+
−
Voltage
(Approx.)
Heat pump control unit
Connector
Terminal
M102
6
Ground
0 V
Heat pump control unit
—
Continuity
Connector
Terminal
M102
6
Ground
No
+
−
Voltage
(Approx.)
Refrigerant channel switching 2 way type valve
Connector
Terminal
E90
1
Ground
Battery voltage
HAC-162
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
B27F2 REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE
1. Turn power switch OFF.
2. Disconnect heat pump control unit connector and A/C auto amp. connector.
3. Check continuity between heat pump control unit harness connector and A/C auto amp. harness connec-
tor.
NOTE:
Check for any adhering foreign substances, cracking, or damage on the heat pump control unit terminal
and A/C auto amp. harness connector terminal.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair harness or connector.
7.
CHECK HEAT PUMP CONTROL UNIT COMMUNICATION LINE FOR SHORT
Check continuity between heat pump control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair harness or connector.
8.
CHECK REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE
Check refrigerant channel switching 2 way type valve. Refer to
HAC-156, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Replace high-pressure cooler pipe assembly. Refer to
HA-47, "2-WAY VALVE AND 3-WAY VALVE
ASSEMBLY : Removal and Installation"
.
9.
PERFORM DTC CONFIRMATION PROCEDURE
Perform DTC confirmation procedure. Refer to
.
Is DTC B27F2 detected?
YES
>> Replace heat pump control unit. Refer to
HAC-188, "Removal and Installation"
NO
>> Check intermittent incident. Refer to
GI-53, "Intermittent Incident"
.
Heat pump control unit
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M102
1
M55
40
Yes
Heat pump control unit
—
Continuity
Connector
Terminal
M102
1
Ground
No
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