Nissan Leaf. Manual — part 792
B27F5 REFRIGERANT CHANNEL SWITCHING 3 WAY TYPE VALVE
HAC-171
< 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 3 WAY TYPE VALVE
Check refrigerant channel switching 3 way type valve. Refer to
HAC-165, "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 B27F5 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-172
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
B27FF A/C AUTO AMP.
B27FF A/C AUTO AMP.
DTC Logic
INFOID:0000000010121876
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-172, "Diagnosis Procedure"
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010121877
1.
PERFORM A/C AUTO AMP. CONFIGURATION
With CONSULT
1. Turn power switch ON
2. Use CONSULT and perform configuration (control unit setting) of “HVAC”. Refer to
>> Inspection End.
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible cause
B27FF
CONFIG NOT IMPLEM
When A/C auto amp. configuration (control unit
setting) is not performed.
A/C auto amp (Not performed config-
uration)
POWER SUPPLY AND GROUND CIRCUIT
HAC-173
< 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
POWER SUPPLY AND GROUND CIRCUIT
A/C AUTO AMP.
A/C AUTO AMP. : Diagnosis Procedure
INFOID:0000000010121878
Regarding Wiring Diagram information, refer to
1.
CHECK SYMPTOM
Check symptom (A or B).
Which symptom is detected?
A
>> GO TO 2.
B
>> GO TO 4.
2.
CHECK FUSE
1. Turn power switch OFF.
2. Check 10A fuse [No. 3, located in fuse block (J/B)].
NOTE:
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
3.
CHECK A/C AUTO AMP. POWER SWITCH POWER SUPPLY
1. Disconnect A/C auto amp. connector.
2. Turn power switch ON.
3. Check voltage between A/C auto amp. harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector between A/C auto amp. and fuse.
4.
CHECK FUSE
1. Turn power switch OFF.
2. Check 10A fuse [No.13, located in fuse block (J/B)].
NOTE:
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace the blown fuse after repairing the affected circuit.
5.
CHECK A/C AUTO AMP. BATTERY POWER SUPPLY
1. Disconnect A/C auto amp. connector.
Symptom
A
• Air conditioning system does not activate.
• Air conditioning system does cannot be controlled.
• Operation status of air conditioning system is not indicated on display.
B
• Memory function does not operate normally.
• The setting is not maintained. (It returns to the initial condition)
+
−
Voltage
(Approx.)
A/C auto amp.
Connector
Terminal
M55
32
Ground
9 V or more
HAC-174
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
POWER SUPPLY AND GROUND CIRCUIT
2. Check voltage between A/C auto amp. harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector between A/C auto amp. and fuse.
6.
CHECK A/C AUTO AMP. GROUND CIRCUIT FOR OPEN
1. Turn power switch OFF.
2. Check continuity between A/C auto amp. 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.)
A/C auto amp.
Connector
Terminal
M55
31
Ground
Battery voltage
A/C auto amp.
—
Continuity
Connector
Terminal
M55
10
Ground
Yes
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