Nissan Leaf. Manual — part 772
B2578, B2579 IN-VEHICLE SENSOR
HAC-91
< 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
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:0000000010121800
1.
CHECK IN-VEHICLE SENSOR
1. Remove in-vehicle sensor. Refer to
HAC-190, "Removal and Installation"
2. Check resistance between in-vehicle sensor terminals. Refer to applicable table for the normal value.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace in-vehicle sensor. Refer to
HAC-190, "Removal and Installation"
.
Terminal
Condition
Resistance: k
Ω
Temperature:
°C (°F)
1
2
−20 (−4)
16.43
−10 (14)
9.90
0 (32)
6.19
10 (50)
4.01
20 (68)
2.67
25 (77)
2.20
30 (86)
1.83
40 (104)
1.28
HAC-92
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
B257B, B257C AMBIENT SENSOR
B257B, B257C AMBIENT SENSOR
DTC Logic
INFOID:0000000010121801
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 ON.
2. Select “Self Diagnostic Result” of “HVAC” using CONSULT.
3. Check DTC.
Is DTC detected?
YES
>> Refer to
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010121802
Regarding Wiring Diagram information, refer to
1.
CHECK AMBIENT SENSOR VOLTAGE SIGNAL
1. Turn power switch ON.
2. Operate the automatic air conditioning system.
3. Check voltage signal between A/C auto amp. harness connector terminals.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 2.
2.
CHECK AMBIENT SENSOR POWER SUPPLY
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible cause
B257B
AMBIENT SENSOR
The ambient sensor recognition temperature is
too high [more than 100
°C (212°F)].
• Ambient sensor
• A/C auto amp.
• Harness or connectors
(The sensor circuit is open or short-
ed.)
B257C
The ambient sensor recognition temperature is
too low [less than
−42°C (−44°F)].
A/C auto amp.
Test condition
Voltage signal
Connector
+
−
Terminal
M55
36
10
• Power switch ON
• When air conditioner is op-
erating
JSIIA1665ZZ
B257B, B257C AMBIENT SENSOR
HAC-93
< 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 ambient sensor connector.
3. Turn power switch ON.
4. Check voltage between ambient sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 5.
3.
CHECK AMBIENT SENSOR GROUND CIRCUIT FOR OPEN
1. Turn power switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between ambient sensor 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 AMBIENT SENSOR
Check ambient sensor. Refer to
HAC-94, "Component Inspection"
.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-187, "Removal and Installation"
.
NO
>> Replace ambient sensor. Refer to
HAC-189, "Removal and Installation"
5.
CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn power switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between ambient sensor 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 AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR SHORT
Check continuity between ambient 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.
+
−
Voltage
(Approx.)
Ambient sensor
Connector
Terminal
E53
1
Ground
5 V
Ambient sensor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
E53
2
M55
30
Yes
Ambient sensor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
E53
1
M55
36
Yes
Ambient sensor
—
Continuity
Connector
Terminal
E53
1
Ground
No
HAC-94
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITH HEAT PUMP)]
B257B, B257C AMBIENT SENSOR
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:0000000010121803
1.
CHECK AMBIENT SENSOR
1. Remove ambient sensor. Refer to
HAC-189, "Removal and Installation"
.
2. Check resistance between ambient sensor terminals. Refer to applicable table for the normal value.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace ambient sensor. Refer to
HAC-189, "Removal and Installation"
Terminal
Condition
Resistance: k
Ω
Temperature:
°C (°F)
1
2
−20 (−4)
16.50
−10 (14)
9.92
0 (32)
6.19
10 (50)
3.99
20 (68)
2.65
25 (77)
2.19
30 (86)
1.81
40 (104)
1.27
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