Nissan Murano Z51. Instruction — part 847
U1000 CAN COMM CIRCUIT
HAC-43
< DTC/CIRCUIT DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
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HAC
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DTC/CIRCUIT DIAGNOSIS
U1000 CAN COMM CIRCUIT
Description
INFOID:0000000005514596
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with two
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Signal Chart. Refer to
LAN-16, "How to Use CAN Communication Signal Chart"
.
DTC Logic
INFOID:0000000005514597
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000005514598
1.
CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III
1.
Turn ignition switch ON and wait for 2 or more seconds.
2.
Using CONSULT-III, perform “SFLF-DIAGNOSIS RESULTS” of HVAC.
Is “CAN COMM CIRCUIT” displayed?
YES
>> Perform trouble diagnosis for the CAN communication system. Refer to
.
NO
>> Perform the intermittent malfunction diagnosis. Refer to
GI-39, "Intermittent Incident"
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
U1000
CAN COMM CIRCUIT
When A/C auto amp. is not transmitting
or receiving CAN communication signal
for 2 or more seconds.
CAN communication system
HAC-44
< DTC/CIRCUIT DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
U1010 CONTROL UNIT (CAN)
U1010 CONTROL UNIT (CAN)
Description
INFOID:0000000005514599
Initial diagnosis of A/C auto amp.
DTC Logic
INFOID:0000000005514600
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000005514601
1.
CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III
Using CONSULT-III, perform “SELF-DIAGNOSIS RESULTS” of HVAC.
Is DTC No.“U1010” displayed?
YES
>> Replace A/C auto amp.
NO
>> INSPECTION END
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
U1010
CONTROL UNIT (CAN)
When detecting error during the initial diag-
nosis of CAN controller of A/C auto amp.
A/C auto amp.
B257B, B257C AMBIENT SENSOR
HAC-45
< DTC/CIRCUIT DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
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B257B, B257C AMBIENT SENSOR
Description
INFOID:0000000005514602
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:0000000005514603
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 [
−
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-46
< DTC/CIRCUIT DIAGNOSIS >
[WITHOUT 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
.
• 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
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005514604
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-47, "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
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