Nissan Sentra. Manual — part 553
HAC-60
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
B2578, B2579 IN-VEHICLE SENSOR
B2578, B2579 IN-VEHICLE SENSOR
DTC Logic
INFOID:0000000009757654
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. Refer to
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Turn ignition switch ON.
2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
3. Check if any DTC No. is displayed in the self-diagnosis results.
Is DTC detected?
YES
>> Refer to
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000009757655
Regarding Wiring Diagram information, refer to
1.
CHECK IN-VEHICLE SENSOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect in-vehicle sensor connector.
3. Turn ignition switch ON.
4. Check voltage between in-vehicle sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 4.
2.
CHECK IN-VEHICLE SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between front in-vehicle sensor harness connector and ground.
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible cause
B2578
IN-VEHICLE SENSOR
The in-vehicle sensor recognition temperature
is too high.
• In-vehicle sensor
• A/C auto amp.
• Harness or connectors
(The sensor circuit is open or short-
ed.)
B2579
The in-vehicle sensor recognition temperature
is too low.
+
−
Voltage
(Approx.)
In-vehicle sensor
Connector
Terminal
M69
1
Ground
5 V
B2578, B2579 IN-VEHICLE SENSOR
HAC-61
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK IN-VEHICLE SENSOR
Check in-vehicle sensor. Refer to
HAC-61, "Component Inspection"
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-105, "Removal and Installation"
.
NO
>> Replace in-vehicle sensor. Refer to
HAC-107, "Removal and Installation"
.
4.
CHECK IN-VEHCILE SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between in-vehicle sensor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair harness or connector.
5.
CHECK IN-VEHICLE SENSOR POWER SUPPLY CIRCUIT FOR GROUND SHORT
Check continuity between in-vehicle sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK IN-VEHICLE SENSOR POWER SUPPLY CIRCUIT FOR POWER SHORT
1. Turn ignition switch ON.
2. Check voltage between in-vehicle sensor harness connector and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-105, "Removal and Installation"
.
NO
>> Repair harness or connector.
Component Inspection
INFOID:0000000009757656
1.
CHECK IN-VEHICLE SENSOR
1. Turn ignition switch OFF.
2. Disconnect in-vehicle sensor connector.
In-vehicle sensor
—
Continuity
Connector
Terminal
M69
2
Ground
Yes
In-vehicle sensor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M69
1
M34
2
Yes
In-vehicle sensor
—
Continuity
Connector
Terminal
M69
1
Ground
No
+
−
Voltage
(Approx.)
In-vehicle sensor
Connector
Terminal
M69
1
Ground
0 V
HAC-62
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
B2578, B2579 IN-VEHICLE SENSOR
3. Check resistance between in-vehicle sensor terminals.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace in-vehicle sensor. Refer to
HAC-107, "Removal and Installation"
.
Terminal
Condition
Resistance: k
Ω
Temperature:
°C (°F)
1
2
−15 (5)
12.73
−10 (14)
9.92
−5 (23)
7.80
0 (32)
6.19
5 (41)
4.95
10 (50)
3.99
15 (59)
3.24
20 (68)
2.65
25 (77)
2.19
30 (86)
1.81
35 (95)
1.51
40 (104)
1.27
45 (113)
1.07
B257B, B257C AMBIENT SENSOR
HAC-63
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
B257B, B257C AMBIENT SENSOR
DTC Logic
INFOID:0000000009757657
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. Refer to
.
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Turn ignition switch ON.
2. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
3. Check if any DTC No. is displayed in the self-diagnosis results.
Is DTC detected?
YES
>> Refer to
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000009757658
Regarding Wiring Diagram information, refer to
1.
CHECK AMBIENT SENSOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect ambient sensor connector.
3. Turn ignition switch ON.
4. Check voltage between ambient sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 4.
2.
CHECK AMBIENT SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between ambient sensor harness connector and ground.
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible cause
B257B
AMBIENT SENSOR
The ambient sensor recognition temperature is
too high.
• 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.
+
−
Voltage
(Approx.)
Ambient sensor
Connector
Terminal
E67
1
Ground
5 V
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