Nissan Leaf. Manual — part 784
B27C1 HEAT PUMP CONTROL UNIT
HAC-139
< 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
B27C1 HEAT PUMP CONTROL UNIT
DTC Logic
INFOID:0000000010121848
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. Select “Self Diagnostic Result” of “HVAC” using CONSULT.
4. Check DTC.
Is DTC detected?
YES
>> Refer to
HAC-139, "Diagnosis Procedure"
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010121849
Regarding Wiring Diagram information, refer to
1.
CHECK HEAT PUMP CONTROL UNIT POWER SUPPLY
1. Turn power switch ON
2. Check voltage between heat pump control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 2.
2.
CHECK A/C RELAY
Check A/C relay. Refer to
EVC-385, "Diagnosis Procedure"
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace malfunctioning components.
3.
CHECK HEAT PUMP CONTROL UNIT POWER SUPPLY CIRCUIT FOR OPEN
1. Turn power switch OFF.
2. Disconnect heat pump control unit.
3. Remove A/C relay.
4. Check continuity between heat pump control unit harness connector and A/C relay harness connector.
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible cause
B27C1
A/C AUTO AMP. LIN COMM
When there is a malfunction in the signal trans-
mitted from the heat pump control unit
• Heat pump control unit
• A/C auto amp.
• Harness or connectors
(Heat pump control unit circuit is
open or shorted.)
+
−
Voltage
(Approx.)
Heat pump control unit
Connector
Terminal
M102
9
Ground
Battery voltage
HAC-140
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
B27C1 HEAT PUMP CONTROL UNIT
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK HEAT PUMP CONTROL UNIT POWER SUPPLY CIRCUIT FOR SHORT
Check continuity between heat pump control unit harness connector and ground.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-53, "Intermittent Incident"
.
NO
>> Repair harness or connector.
5.
CHECK HEAT PUMP CONTROL UNIT GROUND CIRCUIT
1. Turn power switch OFF.
2. Disconnect heat pump control unit connector.
3. Check continuity between heat pump control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK HEAT PUMP CONTROL UNIT COMMUNICATION LINE FOR OPEN
1. Disconnect A/C auto amp. connector.
2. 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?
Heat pump control unit
A/C relay
Continuity
Connector
Terminal
Connector
Terminal
M102
9
E52
5
Yes
Heat pump control unit
−
Continuity
Connector
Terminal
M102
9
Ground
No
Heat pump control unit
−
Continuity
Connector
Terminal
M102
16
Ground
Yes
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
B27C1 HEAT PUMP CONTROL UNIT
HAC-141
< 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 8.
NO
>> Repair harness or connector.
8.
PERFORM DTC CONFIRMATION PROCEDURE
Perform DTC confirmation procedure. Refer to
.
Is DTC B27C1 detected?
YES
>> Replace heat pump control unit. Refer to
HAC-188, "Removal and Installation"
NO
>> Inspection End.
HAC-142
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
B27C2, B27C3 PTC HEATER OUTLET AIR TEMPERATURE SENSOR
B27C2, B27C3 PTC HEATER OUTLET AIR TEMPERATURE SENSOR
DTC Logic
INFOID:0000000010121850
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-148, "Diagnosis Procedure"
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010121851
Regarding Wiring Diagram information, refer to
1.
CHECK PTC HEATER OUTLET AIR 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
B27C2
PTC OUT AIR TEMP SENS
The PTC heater outlet air temperature sensor
recognition temperature is too low [less than
−
42
°C (−44°F)].
• PTC heater outlet air temperature
sensor
• A/C auto amp.
• Harness or connectors
(The sensor circuit is open or short-
ed.)
B27C3
The PTC heater outlet air temperature sensor
recognition temperature is too high [more than
200
°C (392°F)].
A/C auto amp.
Test condition
Voltage signal
connector
+
−
Terminal
M55
17
10
• Power switch ON
• When air conditioner is op-
erating
JSIIA1778ZZ
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст