Nissan Leaf. Manual — part 785
B27C2, B27C3 PTC HEATER OUTLET AIR TEMPERATURE SENSOR
HAC-143
< 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
YES
>> GO TO 7.
NO
>> GO TO 2.
2.
CHECK PTC HEATER OUTLET AIR TEMPERATURE SENSOR POWER SUPPLY
1. Turn power switch OFF.
2. Disconnect PTC heater outlet air and A/C unit case temperature sensor assembly connector.
3. Turn power switch ON.
4. Check voltage between PTC heater outlet air and A/C unit case temperature sensor assembly harness
connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 5.
3.
CHECK PTC HEATER OUTLET AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN
1. Turn power switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between PTC heater outlet air and A/C unit case temperature sensor assembly harness
connector and A/C auto amp harness connector.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK PTC HEATER OUTLET AIR TEMPERATURE SENSOR
Check PTC heater outlet air temperature sensor. Refer to
HAC-144, "Component Inspection"
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"
5.
CHECK PTC HEATER OUTLET AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn power switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between PTC heater outlet air and A/C unit case temperature sensor assembly harness
connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK PTC HEATER OUTLET AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT FOR SHORT
+
−
Voltage
(Approx.)
PTC heater outlet air and A/C unit case temperature sensor as-
sembly
Connector
Terminal
M138
2
Ground
5 V
PTC heater outlet air and A/C unit case temperature
sensor assembly
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M138
1
M55
30
Yes
PTC heater outlet air and A/C unit case temperature
sensor assembly
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M138
2
M55
17
Yes
HAC-144
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
B27C2, B27C3 PTC HEATER OUTLET AIR TEMPERATURE SENSOR
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:0000000010121852
1.
CHECK PTC HEATER OUTLET AIR 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
2
Ground
No
Terminal
Condition
Resistance: k
Ω
Temperature:
°C (°F)
1
2
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
B27C4, B27C5 A/C UNIT CASE TEMPERATURE SENSOR
HAC-145
< 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
B27C4, B27C5 A/C UNIT CASE TEMPERATURE SENSOR
DTC Logic
INFOID:0000000010121853
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 hot 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-145, "Diagnosis Procedure"
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010121854
Regarding Wiring Diagram information, refer to
1.
CHECK A/C UNIT CASE TEMPERATURE SENSOR VOLTAGE SIGNAL
1. Turn power switch ON.
2. Operate the automatic air conditioning system.
3. Check voltage between A/C auto amp. harness connector terminals.
Is the inspection result normal?
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible cause
B27C4
A/C UNIT CASE TEMP
SENS
The A/C unit case temperature sensor recogni-
tion temperature is too low [less than
−42°C (−
44
°F)].
• A/C unit case temperature sensor
• A/C auto amp.
• Harness or connectors
(The sensor circuit is open or short-
ed.)
B27C5
The A/C unit case temperature sensor recogni-
tion temperature is too high [more than 200
°C
(392
°F)].
A/C auto amp.
Test condition
Voltage signal
connector
+
−
Terminal
M55
37
10
• Power switch ON
• When air conditioner is op-
erating
JSIIA1778ZZ
HAC-146
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
B27C4, B27C5 A/C UNIT CASE TEMPERATURE SENSOR
YES
>> GO TO 7.
NO
>> GO TO 2.
2.
CHECK A/C UNIT CASE TEMPERATURE SENSOR POWER SUPPLY
1. Turn power switch OFF.
2. Disconnect PTC heater outlet air and A/C unit case temperature sensor assembly connector.
3. Turn power switch ON.
4. Check voltage between PTC heater outlet air and A/C unit case temperature sensor assembly harness
connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 5.
3.
CHECK A/C UNIT CASE TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN
1. Turn power switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between PTC heater outlet air and A/C unit case temperature sensor assembly harness
connector and A/C auto amp harness connector.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK A/C UNIT CASE TEMPERATURE SENSOR
Check A/C unit case 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 PTC heater outlet air and A/C unit case temperature sensor assembly. Refer to
198, "Removal and Installation"
.
5.
CHECK A/C UNIT CASE TEMPERATURE SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn power switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between PTC heater outlet air and A/C unit case temperature sensor assembly harness
connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK A/C UNIT CASE TEMPERATURE SENSOR POWER SUPPLY CIRCUIT FOR SHORT
+
−
Voltage
(Approx.)
PTC heater outlet air and A/C unit case temperature sensor as-
sembly
Connector
Terminal
M138
4
Ground
5 V
PTC heater outlet air and A/C unit case temperature
sensor assembly
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M138
3
M55
30
Yes
PTC heater outlet air and A/C unit case temperature
sensor assembly
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M138
4
M55
37
Yes
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