Nissan Pathfinder. Manual — part 706
B2578, B2579 IN-VEHICLE SENSOR
HAC-85
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
3. Check resistance between in-vehicle sensor terminals.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace in-vehicle sensor. Refer to
HAC-159, "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
HAC-86
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
B257B, B257C AMBIENT SENSOR
B257B, B257C AMBIENT SENSOR
DTC Logic
INFOID:0000000009176824
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 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:0000000009176825
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
E206
1
Ground
5 V
B257B, B257C AMBIENT SENSOR
HAC-87
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
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 AMBIENT SENSOR
Check ambient sensor. Refer to
HAC-87, "Component Inspection"
.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-157, "Removal and Installation"
.
NO
>> Replace ambient sensor. Refer to
HAC-158, "Removal and Installation"
4.
CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn ignition 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 5.
NO
>> Repair harness or connector.
5.
CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR GROUND SHORT
Check continuity between ambient sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR POWER SHORT
1. Turn ignition switch ON.
2. Check voltage between ambient sensor harness connector and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-157, "Removal and Installation"
.
NO
>> Repair harness or connector.
Component Inspection
INFOID:0000000009176826
1.
CHECK AMBIENT SENSOR
1. Turn ignition switch OFF.
2. Disconnect ambient sensor connector.
Ambient sensor
—
Continuity
Connector
Terminal
E206
2
Ground
Yes
Ambient sensor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
E206
1
M50
7
Yes
Ambient sensor
—
Continuity
Connector
Terminal
E206
1
Ground
No
+
−
Voltage
(Approx.)
Ambient sensor
Connector
Terminal
E206
1
Ground
0 V
HAC-88
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
B257B, B257C AMBIENT SENSOR
3. Check resistance between ambient sensor terminals.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace ambient sensor. Refer to
HAC-158, "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
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