Nissan Leaf. Manual — part 787
B27C8, B27C9 COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SEN-
SOR
HAC-151
< 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
B27C8, B27C9 COMPRESSOR SUCTION REFRIGERANT TEMPERATURE
SENSOR
DTC Logic
INFOID:0000000010121859
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 1 second.
5. Select “Self Diagnostic Result” of “HVAC” using CONSULT.
6. Check DTC.
Is DTC detected?
YES
>> Refer to
HAC-151, "Diagnosis Procedure"
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010121860
Regarding Wiring Diagram information, refer to
1.
CHECK COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SENSOR VOLTAGE SIGNAL
1. Turn power switch ON.
2. Operate the automatic air conditioning system.
3. Check voltage between heat pump control unit harness connector terminals.
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible cause
B27C8
COMP SUCTION TEMP
SENS
The compressor suction refrigerant tempera-
ture sensor recognition temperature is too low
[less than
−66°C (−86.8°F)].
• Compressor suction refrigerant
temperature sensor
• A/C auto amp.
• Harness or connectors
(The sensor circuit is open or short-
ed.)
B27C9
The compressor suction refrigerant tempera-
ture sensor recognition temperature is too high
[more than 138.4
°C (281.1°F)].
Heat pump control unit
Test condition
Voltage signal
connector
+
−
Terminal
M102
11
16
• Power switch ON
• When air conditioner is op-
erating
JSIIA1780ZZ
HAC-152
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
B27C8, B27C9 COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SEN-
SOR
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 2.
2.
CHECK COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SENSOR POWER SUPPLY
1. Turn power switch OFF.
2. Disconnect compressor suction refrigerant temperature sensor connector.
3. Turn power switch ON.
4. Check voltage between compressor suction refrigerant temperature sensor harness connector and
ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 5.
3.
CHECK COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SENSOR GROUND CIRCUIT FOR
OPEN
1. Turn power switch OFF.
2. Disconnect heat pump control unit connector.
3. Check continuity between compressor suction refrigerant temperature sensor harness connector and
heat pump control unit harness connector.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SENSOR
Check compressor suction refrigerant temperature sensor. Refer to
HAC-153, "Component Inspection"
.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-187, "Removal and Installation"
.
NO
>> Replace compressor suction refrigerant temperature sensor. Refer to
5.
CHECK COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SENSOR POWER SUPPLY CIR-
CUIT FOR OPEN
1. Turn power switch OFF.
2. Disconnect heat pump control unit connector.
3. Check continuity between compressor suction refrigerant temperature sensor harness connector and
heat pump control unit harness connector.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SENSOR POWER SUPPLY CIR-
+
−
Voltage
(Approx.)
Compressor suction refrigerant temperature sensor
Connector
Terminal
E89
1
Ground
5 V
Compressor suction refrigerant temperature sensor
Heat pump control unit
Continuity
Connector
Terminal
Connector
Terminal
E89
2
M102
8
Yes
Compressor suction refrigerant temperature sensor
Heat pump control unit
Continuity
Connector
Terminal
Connector
Terminal
E89
1
M102
11
Yes
B27C8, B27C9 COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SEN-
SOR
HAC-153
< 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
CUIT FOR SHORT
Check continuity between compressor suction refrigerant temperature sensor 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.
7.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to
GI-53, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-187, "Removal and Installation"
.
NO
>> Repair or replace malfunctioning components.
Component Inspection
INFOID:0000000010121861
1.
CHECK COMPRESSOR SUCTION REFRIGERANT TEMPERATURE SENSOR
1. Remove compressor suction refrigerant temperature sensor. Refer to
HAC-196, "Removal and Installa-
2. Check resistance between compressor suction refrigerant temperature sensor terminals. Refer to applica-
ble table for the normal value.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace compressor suction refrigerant temperature sensor. Refer to
Compressor suction refrigerant temperature sensor
—
Continuity
Connector
Terminal
E89
1
Ground
No
Terminal
Condition
Resistance: k
Ω
Temperature:
°C (°F)
1
2
−20 (−4)
15.9
−10 (14)
9.6
0 (32)
6.0
10 (50)
3.9
20 (68)
2.6
40 (104)
1.2
60 (140)
0.7
80 (176)
0.4
HAC-154
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
B27F0 REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE
B27F0 REFRIGERANT CHANNEL SWITCHING 2 WAY TYPE VALVE
DTC Logic
INFOID:0000000010121862
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-154, "Diagnosis Procedure"
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010121863
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
B27F0
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.)
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