Infiniti QX56 (Z62). Manual — part 797
B257B, B257C AMBIENT SENSOR
HAC-79
< 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
>> INSPECTION END
NO
>> Replace ambient sensor. Refer to
HAC-147, "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-80
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
B2581, B2582 INTAKE SENSOR
B2581, B2582 INTAKE SENSOR
DTC Logic
INFOID:0000000006275915
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-III
1.
Turn ignition switch ON.
2.
Select “Self Diagnostic Result” mode of “HVAC” using CONSULT-III.
3.
Check DTC.
Is DTC detected?
YES
>> Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006275916
1.
CHECK INTAKE SENSOR POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect intake sensor connector.
3.
Turn ignition switch ON.
4.
Check voltage between intake sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 4.
2.
CHECK INTAKE SENSOR GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect A/C auto amp. connector.
3.
Check continuity between intake sensor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
DTC
Items
(CONSULT-III screen terms)
DTC detection condition
Possible cause
B2581
INTAKE SENSOR
The intake sensor recognition temperature is
too high.
• Intake sensor
• A/C auto amp.
• Harness or connectors
(The sensor circuit is open or short-
ed.)
B2582
The intake sensor recognition temperature is
too low.
+
−
Voltage
(Approx.)
Intake sensor
Connector
Terminal
M257
1
Ground
5 V
Intake sensor
—
Continuity
Connector
Terminal
M257
2
Ground
Existed
B2581, B2582 INTAKE SENSOR
HAC-81
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK INTAKE SENSOR
Check intake sensor. Refer to
HAC-81, "Component Inspection"
.
Is the inspection result normal?
YES
>> Replace A/C auto amp.. Refer to
HAC-146, "Removal and Installation"
NO
>> Replace intake sensor. Refer to
HAC-150, "Removal and Installation"
4.
CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1.
Turn ignition switch OFF.
2.
Disconnect A/C auto amp. connector.
3.
Check continuity between intake 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 INTAKE SENSOR POWER SUPPLY CIRCUIT FOR GROUND SHORT
Check continuity between intake sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR POWER SHORT
1.
Turn ignition switch ON.
2.
Check voltage between intake sensor harness connector and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp.. Refer to
HAC-146, "Removal and Installation"
NO
>> Repair harness or connector.
Component Inspection
INFOID:0000000006275917
1.
CHECK INTAKE SENSOR
1.
Turn ignition switch OFF.
2.
Disconnect intake sensor connector.
3.
Check resistance between intake sensor terminals.
Intake sensor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M257
1
M50
28
Existed
Intake sensor
—
Continuity
Connector
Terminal
M257
1
Ground
Not existed
+
−
Voltage
(Approx.)
Intake sensor
Connector
Terminal
M257
1
Ground
0 V
HAC-82
< DTC/CIRCUIT DIAGNOSIS >
[AUTOMATIC AIR CONDITIONING]
B2581, B2582 INTAKE SENSOR
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace intake sensor. Refer to
HAC-150, "Removal and Installation"
Terminal
Condition
Resistance: k
Ω
Temperature:
°
C (
°
F)
1
2
−
15 (5)
17.73
−
10 (14)
13.46
−
5 (23)
10.33
0 (32)
8.00
5 (41)
6.25
10 (50)
4.93
15 (59)
3.92
20 (68)
3.14
25 (77)
2.54
30 (86)
2.06
35 (95)
1.69
40 (104)
1.39
45 (113)
1.15
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