Nissan Leaf. Manual — part 819
U1010 CONTROL UNIT (CAN)
HAC-279
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITHOUT HEAT PUMP)]
C
D
E
F
G
H
J
K
L
M
A
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HAC
N
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U1010 CONTROL UNIT (CAN)
Description
INFOID:0000000010121982
Initial diagnosis of A/C auto amp.
DTC Logic
INFOID:0000000010121983
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Turn power switch ON.
2. Select “Self Diagnostic Result” of “HVAC” using CONSULT.
3. Check DTC.
Is DTC detected?
YES
>> Refer to
HAC-279, "Diagnosis Procedure"
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010121984
1.
REPLACE A/C AUTO AMP.
Replace A/C auto amp. Refer to
HAC-347, "Removal and Installation"
.
>> Inspection End.
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible cause
U1010
CONTROL UNIT (CAN)
When detecting error during the initial diagnosis of CAN
controller of A/C auto amp.
A/C auto amp.
HAC-280
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITHOUT HEAT PUMP)]
B2578, B2579 IN-VEHICLE SENSOR
B2578, B2579 IN-VEHICLE SENSOR
DTC Logic
INFOID:0000000010121985
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
1. Turn power switch ON.
2. Select “Self Diagnostic Result” of “HVAC” using CONSULT.
3. Check DTC.
Is DTC detected?
YES
>> Refer to
HAC-280, "Diagnosis Procedure"
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010121986
Regarding Wiring Diagram information, refer to
1.
CHECK IN-VEHICLE SENSOR VOLTAGE SIGNAL
1. Turn power switch ON.
2. Operate the automatic air conditioning system.
3. Check voltage signal between A/C auto amp. harness connector terminals.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 2.
2.
CHECK IN-VEHICLE SENSOR POWER SUPPLY
DTC
Items
(CONSULT screen terms)
DTC detection condition
Possible cause
B2578
IN-VEHICLE SENSOR
The in-vehicle sensor recognition temperature
is too high [more than 100
°C (212°F)].
• In-vehicle sensor
• A/C auto amp.
• Harness or connectors
(The sensor circuit is open or short-
ed.)
B2579
The in-vehicle sensor recognition temperature
is too low [less than
−42°C (−44°F)].
A/C auto amp.
Test condition
Voltage signal
Connector
+
−
Terminal
M55
33
10
• Power switch ON
• When air conditioner is op-
erating
JSIIA1662ZZ
B2578, B2579 IN-VEHICLE SENSOR
HAC-281
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITHOUT HEAT PUMP)]
C
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HAC
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1. Turn power switch OFF.
2. Disconnect in-vehicle sensor connector.
3. Turn power switch ON.
4. Check voltage between in-vehicle sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 5.
3.
CHECK IN-VEHICLE SENSOR GROUND CIRCUIT FOR OPEN
1. Turn power switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between in-vehicle sensor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair harness or connector.
4.
CHECK IN-VEHICLE SENSOR
Check in-vehicle sensor. Refer to
HAC-282, "Component Inspection"
.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-347, "Removal and Installation"
.
NO
>> Replace in-vehicle sensor. Refer to
HAC-349, "Removal and Installation"
.
5.
CHECK IN-VEHICLE SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn power switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between in-vehicle sensor harness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair harness or connector.
6.
CHECK IN-VEHICLE SENSOR POWER SUPPLY CIRCUIT FOR SHORT
Check continuity between in-vehicle sensor harness connector and ground.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-347, "Removal and Installation"
.
NO
>> Repair harness or connector.
+
−
Voltage
(Approx.)
In-vehicle sensor
Connector
Terminal
M42
1
Ground
5 V
In-vehicle sensor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M42
2
M55
30
Yes
In-vehicle sensor
A/C auto amp.
Continuity
Connector
Terminal
Connector
Terminal
M42
1
M55
33
Yes
In-vehicle sensor
—
Continuity
Connector
Terminal
M42
1
Ground
No
HAC-282
< DTC/CIRCUIT DIAGNOSIS >
[AUTO A/C (WITHOUT HEAT PUMP)]
B2578, B2579 IN-VEHICLE SENSOR
7.
CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to
GI-53, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace A/C auto amp. Refer to
HAC-347, "Removal and Installation"
.
NO
>> Repair or replace malfunctioning components.
Component Inspection
INFOID:0000000010121987
1.
CHECK IN-VEHICLE SENSOR
1. Remove in-vehicle sensor. Refer to
HAC-349, "Removal and Installation"
2. Check resistance between in-vehicle sensor terminals. Refer to applicable table for the normal value.
Is the inspection result normal?
YES
>> Inspection End.
NO
>> Replace in-vehicle sensor. Refer to
HAC-349, "Removal and Installation"
.
Terminal
Condition
Resistance: k
Ω
Temperature:
°C (°F)
1
2
−20 (−4)
16.43
−10 (14)
9.90
0 (32)
6.19
10 (50)
4.01
20 (68)
2.67
25 (77)
2.20
30 (86)
1.83
40 (104)
1.28
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