Nissan Maxima. Instruction — part 740
HAC-136
< DTC/CIRCUIT DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
B257B, B257C AMBIENT SENSOR
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
or
.
• 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
HAC-136, "Diagnosis Procedure"
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010051135
Regarding Wiring Diagram information, refer to
HAC-173, "Wiring Diagram - With Monochrome 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-137, "Component Inspection"
.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-203, "Removal and Installation"
.
NO
>> Replace ambient sensor. Refer to
HAC-204, "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
B257B, B257C AMBIENT SENSOR
HAC-137
< DTC/CIRCUIT DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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-203, "Removal and Installation"
.
NO
>> Repair harness or connector.
Component Inspection
INFOID:0000000010051136
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-204, "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
HAC-138
< DTC/CIRCUIT DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
B2578, B2579 IN-VEHICLE SENSOR
B2578, B2579 IN-VEHICLE SENSOR
Description
INFOID:0000000010051137
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:0000000010051138
DTC DETECTION LOGIC
AWIIA1055ZZ
JPIIA0613GB
AWIIA0049ZZ
RJIA1804E
B2578, B2579 IN-VEHICLE SENSOR
HAC-139
< DTC/CIRCUIT DIAGNOSIS >
[WITH MONOCHROME DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
NOTE:
If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to
DTC CONFIRMATION PROCEDURE
1.
CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT
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
Is DTC No.“B2578” or “B2579” displayed?
YES
>> Perform trouble diagnosis for the in-vehicle sensor. Refer to
HAC-139, "Diagnosis Procedure"
.
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010051139
Regarding Wiring Diagram information, refer to
HAC-173, "Wiring Diagram - With Monochrome Display"
1.
CHECK IN-VEHICLE SENSOR POWER SUPPLY
1. Disconnect in-vehicle sensor connector.
2. Turn ignition switch ON.
3. Check voltage between in-vehicle sensor harness connector
M34 terminal 1 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 4.
2.
CHECK CONTINUITY BETWEEN IN-VEHICLE SENSOR AND A/C AUTO AMP.
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between in-vehicle sensor harness connector
M34 (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 IN-VEHICLE SENSOR
Check in-vehicle sensor. Refer to
HAC-140, "Component Inspection"
.
Is the inspection result normal?
DTC
Items
(CONSULT screen terms)
Diagnostic item is detected when...
Possible cause
B2578
IN-CAR SENSOR (OUT OF RANGE
[LOW])
Detected temperature at in-vehicle
sensor 55
°C (131°F) or more
• In-vehicle sensor
• A/C auto amp.
• Harness and connector
(In-vehicle sensor circuit is open,
or there is a short in the circuit)
B2579
IN-CAR SENSOR (OUT OF RANGE
[HI])
Detected temperature at in-vehicle
sensor -30
°C (-22°F) or less
1 - Ground
: Approx. 5V
AWIIA1136ZZ
2 - 37
: Continuity should exist.
AWIIA1137ZZ
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