Nissan Leaf. Manual — part 786
B27C4, B27C5 A/C UNIT CASE TEMPERATURE SENSOR
HAC-147
< 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
Check continuity between PTC heater outlet air and A/C unit case temperature sensor assembly harness con-
nector 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:0000000010121855
1.
CHECK A/C CASE UNIT TEMPERATURE SENSOR
1. Remove PTC heater outlet air and A/C unit case temperature sensor assembly. Refer to
2. Check resistance between PTC heater outlet air and A/C unit case temperature sensor assembly termi-
nals. Refer to applicable table for the normal value.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace PTC heater outlet air and A/C unit case temperature sensor assembly. Refer to
198, "Removal and Installation"
PTC heater outlet air and A/C unit case temperature sensor as-
sembly
—
Continuity
Connector
Terminal
M138
4
Ground
No
Terminal
Condition
Resistance: k
Ω
Temperature:
°C (°F)
3
4
0 (32)
6.00
10 (50)
3.87
20 (68)
2.57
30 (86)
1.76
40 (104)
1.23
60 (140)
0.64
80 (176)
0.36
100 (212)
0.22
HAC-148
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
B27C6, B27C7 COMPRESSOR DISCHARGE REFRIGERANT TEMPERATURE
SENSOR
B27C6, B27C7 COMPRESSOR DISCHARGE REFRIGERANT TEMPERA-
TURE SENSOR
DTC Logic
INFOID:0000000010121856
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-148, "Diagnosis Procedure"
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010121857
Regarding Wiring Diagram information, refer to
1.
CHECK COMPRESSOR DISCHARGE 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
B27C6
COMP DISCHG TEMP
SENS
The compressor discharge refrigerant tempera-
ture sensor recognition temperature is too low
[less than -6.9
°C (19.6°F)].
• Compressor discharge refrigerant
temperature sensor
• A/C auto amp.
• Harness or connectors
(The sensor circuit is open or short-
ed.)
B27C7
The compressor discharge refrigerant tempera-
ture sensor recognition temperature is too high
[more than 283.4
°C (542.1°F)].
Heat pump control unit
Test condition
Voltage signal
connector
+
−
Terminal
M102
2
16
• Power switch ON
• When air conditioner is op-
erating
JSIIA1779ZZ
B27C6, B27C7 COMPRESSOR DISCHARGE REFRIGERANT TEMPERATURE
SENSOR
HAC-149
< 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 7.
NO
>> GO TO 2.
2.
CHECK COMPRESSOR DISCHARGE REFRIGERANT TEMPERATURE SENSOR POWER SUPPLY
1. Turn power switch OFF.
2. Disconnect compressor discharge refrigerant temperature sensor connector.
3. Turn power switch ON.
4. Check voltage between compressor discharge refrigerant temperature sensor harness connector and
ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 5.
3.
CHECK COMPRESSOR DISCHARGE REFRIGERANT TEMPERATURE SENSOR GROUND CIRCUIT
FOR OPEN
1. Turn power switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between compressor discharge 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 DISCHARGE REFRIGERANT TEMPERATURE SENSOR
Check compressor discharge refrigerant temperature sensor. Refer to
HAC-150, "Component Inspection"
.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-187, "Removal and Installation"
.
NO
>> Replace compressor discharge refrigerant temperature sensor. Refer to
5.
CHECK COMPRESSOR DISCHARGE 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 discharge 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 DISCHARGE REFRIGERANT TEMPERATURE SENSOR POWER SUPPLY CIR-
+
−
Voltage
(Approx.)
Compressor discharge refrigerant temperature sensor
Connector
Terminal
M137
1
Ground
5 V
Compressor discharge refrigerant temperature sensor
Heat pump control unit
Continuity
Connector
Terminal
Connector
Terminal
M137
2
M102
8
Yes
Compressor discharge refrigerant temperature sensor
Heat pump control unit
Continuity
Connector
Terminal
Connector
Terminal
M137
1
M102
2
Yes
HAC-150
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
B27C6, B27C7 COMPRESSOR DISCHARGE REFRIGERANT TEMPERATURE
SENSOR
CUIT FOR SHORT
Check continuity between compressor discharge 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:0000000010121858
1.
CHECK COMPRESSOR DISCHARGE REFRIGERANT TEMPERATURE SENSOR
1. Remove compressor discharge refrigerant temperature sensor. Refer to
HAC-195, "Removal and Installa-
2. Check resistance between compressor discharge refrigerant temperature sensor terminals. Refer to appli-
cable table for the normal value.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace compressor discharge refrigerant temperature sensor. Refer to
Compressor discharge refrigerant temperature sensor
—
Continuity
Connector
Terminal
M137
1
Ground
No
Terminal
Condition
Resistance: k
Ω
Temperature:
°C (°F)
1
2
0 (32)
16.43
10 (50)
9.90
20 (68)
6.19
30 (86)
4.01
40 (104)
2.67
60 (140)
2.20
80 (176)
1.83
100 (212)
1.28
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