Nissan Murano Z51. Manual - part 878

 

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Nissan Murano Z51. Manual - part 878

 

 

B257B, B257C AMBIENT SENSOR

HAC-167

< DTC/CIRCUIT DIAGNOSIS >

[WITH 7 INCH DISPLAY]

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HAC

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B257B, B257C AMBIENT SENSOR

Description

INFOID:0000000005514706

COMPONENT DESCRIPTION

Ambient Sensor

• The ambient sensor (1) is installed to the front bumper (left back). 
• 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 tem-
perature 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:0000000005514707

DTC DETECTION LOGIC

NOTE:
• If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to 

HAC-

165, "DTC Logic"

 or 

HAC-166, "DTC Logic"

• If there is an open circuit in the ambient sensor, A/C auto amp. registers extreme cold [

44

°

C (

47

°

F)] and

adjusts the temperature control warmer. 

DTC CONFIRMATION PROCEDURE

1.

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III

JSIIA1532JP

JPIIA0612GB

DTC

Items

 (CONSULT-III screen terms)

Diagnostic item is detected when...

Possible cause

B257B

AMB TEMP SEN SHORT

Detected temperature at ambient sensor 

44

°

C (

47

°

F) or less

• 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 
100

°

C (212

°

F) or more

HAC-168

< DTC/CIRCUIT DIAGNOSIS >

[WITH 7 INCH DISPLAY]

B257B, B257C AMBIENT SENSOR

1.

Using CONSULT-III, 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 

HAC-

165, "DTC Logic"

 or 

HAC-166, "DTC Logic"

• If there is an open circuit in the ambient sensor, A/C auto amp. registers extreme cold [

44

°

C (

47

°

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-168, "Diagnosis Procedure"

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005514708

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 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

CHECK CIRCUIT 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 and A/C auto amp. harness connector.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK AMBIENT SENSOR

Check ambient sensor. Refer to 

HAC-169, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp.

NO

>> Replace ambient sensor.

4.

CHECK CIRCUIT 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 and A/C auto amp. harness connector.

4.

Check continuity between ambient sensor harness connector and ground.

(+)

(

)

Voltage

Ambient sensor

Connector

Terminal

E337

1

Ground

Approx. 5 V

Ambient sensor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

E337

2

M50

37

Existed

Ambient sensor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

E337

1

M50

35

Existed

B257B, B257C AMBIENT SENSOR

HAC-169

< DTC/CIRCUIT DIAGNOSIS >

[WITH 7 INCH DISPLAY]

C

D

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F

G

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A

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HAC

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O

P

Is the inspection result normal?

YES

>> Replace A/C auto amp.

NO

>> Repair harness or connector.

Component Inspection

INFOID:0000000005514709

1.

CHECK AMBIENT SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect ambient sensor connector. Refer to 

VTL-88, "Exploded View"

.

3.

Check resistance between ambient sensor terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace ambient sensor.

Ambient sensor

Continuity

Connector

Terminal

E337

1

Ground

Not existed

Terminal

Condition

Resistance k

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-170

< DTC/CIRCUIT DIAGNOSIS >

[WITH 7 INCH DISPLAY]

B2578, B2579 IN-VEHICLE SENSOR

B2578, B2579 IN-VEHICLE SENSOR

Description

INFOID:0000000005514710

In-vehicle Sensor
• The in-vehicle sensor (1) is located on instrument driver lower

panel (2). 

• 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:0000000005514711

DTC DETECTION LOGIC

JPIIA0557ZZ

JPIIA0613GB

JPIIA0517ZZ

RJIA1804E

 

 

 

 

 

 

 

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