Nissan Maxima. Manual — part 714
HAC-32
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
B257B, B257C AMBIENT SENSOR
B257B, B257C AMBIENT SENSOR
Description
INFOID:0000000010050970
COMPONENT DESCRIPTION
Ambient Sensor
• The ambient sensor (1) is installed to the front bumper reinforce-
ment.
• It detects ambient temperature and converts it into a resistance
value which is then input into the A/C auto amp.
Ambient Sensor Circuit
AMBIENT TEMPERATURE INPUT PROCESS
The A/C auto amp. equips a processing circuit for the ambient sensor input. However, when the temperature
detected by the ambient sensor increases quickly, the processing circuit retards the A/C auto amp. function. It
only allows the A/C auto amp. to recognize an ambient temperature increase of 0.33
°C (0.6°F) per 100 sec-
onds.
As an example, consider stopping for a few minutes after high-speed driving. Although the actual ambient
temperature has not changed, the temperature detected by the ambient sensor increases. This is because the
heat from the engine compartment can radiate to the front bumper area, the location of the ambient sensor.
DTC Logic
INFOID:0000000010050971
DTC DETECTION LOGIC
NOTE:
• If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to
.
• If there is an open circuit in the ambient sensor, A/C auto amp. registers extreme cold [-30
°C (-22°F)] and
adjusts the temperature control warmer.
DTC CONFIRMATION PROCEDURE
1.
CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT
ALIIA0314ZZ
JPIIA0612GB
DTC
Items
(CONSULT screen terms)
Diagnostic item is detected when...
Possible cause
B257B
AMB TEMP SEN (SHORT)
Detected temperature at ambient sensor
55
°C (131°F) or more
• Ambient sensor
• A/C auto amp.
• Harness and connector
(Ambient sensor circuit is open,
or there is a short in the circuit)
B257C
AMB TEMP SEN (OPEN)
Detected temperature at ambient sensor
-30
°C (-22°F) or less
B257B, B257C AMBIENT SENSOR
HAC-33
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
1. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
2. Check if any DTC No. is displayed in the self-diagnosis results.
NOTE:
• If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to
.
• If there is an open circuit in the ambient sensor, A/C auto amp. registers extreme cold [-30
°C (-22°F)] and
adjusts the temperature control warmer.
Is DTC No.“B257B” or “B257C” displayed?
YES
>> Perform trouble diagnosis for the ambient sensor. Refer to
.
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010050972
Regarding Wiring Diagram information, refer to
HAC-67, "Wiring Diagram - With Color Display"
1.
CHECK VOLTAGE BETWEEN AMBIENT SENSOR AND GROUND
1. Disconnect ambient sensor connector.
2. Turn ignition switch ON.
3. Check voltage between ambient sensor harness connector
E211 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 4.
2.
CHECK CONTINUITY BETWEEN AMBIENT SENSOR AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between ambient sensor harness connector
E211 (A) terminal 2 and A/C auto amp. harness connector
M37(B) terminal 37.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair harness or connector.
3.
CHECK AMBIENT SENSOR
Check ambient sensor. Refer to
HAC-34, "Component Inspection"
.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-100, "Removal and Installation"
.
NO
>> Replace ambient sensor. Refer to
HAC-101, "Removal and Installation"
4.
CHECK CONTINUITY BETWEEN AMBIENT SENSOR AND A/C AUTO AMP.
1 - Ground
: Approx. 5V
AWIIA1133ZZ
2 - 37
: Continuity should exist.
AWIIA1134ZZ
HAC-34
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
B257B, B257C AMBIENT SENSOR
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between ambient sensor harness connector
E211 (A) terminal 1 and A/C auto amp. harness connector M37
(B) terminal 35.
4. Check continuity between ambient sensor harness connector
E211 (A) terminal 1 and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-100, "Removal and Installation"
.
NO
>> Repair harness or connector.
Component Inspection
INFOID:0000000010050973
1.
CHECK AMBIENT SENSOR
1. Turn ignition switch OFF.
2. Disconnect ambient sensor connector.
3. Check resistance between ambient sensor terminals.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace ambient sensor. Refer to
HAC-101, "Removal and Installation"
1 - 35
: Continuity should exist.
1 - Ground
: Continuity should not exist.
AWIIA1135ZZ
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
B2578, B2579 IN-VEHICLE SENSOR
HAC-35
< DTC/CIRCUIT DIAGNOSIS >
[WITH COLOR DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
B2578, B2579 IN-VEHICLE SENSOR
Description
INFOID:0000000010050974
In-vehicle Sensor
• The in-vehicle sensor (1) is located on instrument lower cover
(LH).
• It converts variations in compartment air temperature drawn from
the aspirator into a resistance value. It is then input into the A/C
auto amp.
In-vehicle Sensor Circuit
Aspirator
The aspirator (1) is located on driver side of heater & cooling unit
assembly. It produces vacuum pressure due to air discharged from
the heater & cooling unit assembly, continuously taking compartment
air in the aspirator.
DTC Logic
INFOID:0000000010050975
DTC DETECTION LOGIC
AWIIA1055ZZ
JPIIA0613GB
AWIIA0049ZZ
RJIA1804E
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст