2011 INFINITI QX56 ignition

HAC-74
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
B2578, B2579 FRONT IN-VEHICLE SENSOR
B2578, B2579 FRONT IN-VEHICLE SENSOR
DTC LogicINFOID:0000000006275909
DTC DETECTION LOGIC
NOTE:
 If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
HAC-
72, "DTC Logic".
 If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to HAC-
73, "DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” m ode of “HVAC” using CONSULT-III.
3. Check DTC.
Is DTC detected?
YES >> Refer to HAC-106, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006275910
1.CHECK FRONT IN-VEHICLE SENSOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect front in-vehicle sensor connector.
3. Turn ignition switch ON.
4. Check voltage between front in-vehicle sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK FRONT IN-VEHCLE SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between front in-vehicle sensor harness connector and A/C auto amp. harness connec-
tor.
Is the inspection result normal?
DTC Items
(CONSULT-III screen terms) DTC detection condition Possible cause
B2578 IN-VEHICLE SENSOR The front in-vehicle sensor recognition temper-
ature is too high.
 Front in-vehicle sensor
 A/C auto amp.
 Harness or connectors
(The sensor circuit is open or short-
ed.)
B2579
The front in-vehicle sensor recognition temper-
ature is too low.
+
−Voltage
(Approx.)
Front in-vehicle sensor
Connector Terminal M73 1 Ground 5 V
Front in-vehicle sensor —Continuity
Connector Terminal
M73 2 Ground Existed
Revision: 2010 May2011 QX56

B2578, B2579 FRONT IN-VEHICLE SENSORHAC-75
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK FRONT IN-VEHICLE SENSOR
Check front in-vehicle sensor. Refer to HAC-107, "
Component Inspection".
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Replace front in-vehicle sensor. Refer to HAC-148, "
FRONT A/C UNIT ASSEMBLY : Removal
and Installation".
4.CHECK FRONT IN-VEHCLE SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between front in-vehicle sens or harness connector and A/C auto amp. harness connec-
tor.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair harness or connector.
5.CHECK FRONT IN-VEHCLE SENSOR POWER SUPPLY CIRCUIT FOR GROUND SHORT
Check continuity between front in-vehicle sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair harness or connector.
6.CHECK FRONT IN-VEHICLE SENSOR PO WER SUPPLY CIRCUIT FOR POWER SHORT
1. Turn ignition switch ON.
2. Check voltage between front in-vehicle sensor harness connector and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Repair harness or connector.
Component InspectionINFOID:0000000006275911
1.CHECK FRONT IN-VEHICLE SENSOR
1. Turn ignition switch OFF.
2. Disconnect front in-vehicle sensor connector.
3. Check resistance between front in-vehicle sensor terminals.
Front in-vehicle sensor A/C auto amp. Continuity
Connector Terminal Connector Terminal
M73 1 M50 27 Existed
Front in-vehicle sensor —Continuity
Connector Terminal
M73 1 Ground Not existed
+ −Vol tag e
(Approx.)
Front in-vehicle sensor
Connector Terminal M73 1 Ground 0 V
Revision: 2010 May2011 QX56

B257B, B257C AMBIENT SENSORHAC-77
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
B257B, B257C AMBIENT SENSOR
DTC LogicINFOID:0000000006275912
DTC DETECTION LOGIC
NOTE:
 If DTC is displayed along with DTC U1000, first per form the trouble diagnosis for DTC U1000. Refer to HAC-
72, "DTC Logic".
 If DTC is displayed along with DTC U1010, fi rst perform the trouble diagnosis for DTC U1010. HAC-73,
"DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” m ode of “HVAC” using CONSULT-III.
3. Check DTC.
Is DTC detected?
YES >> Refer to HAC-77, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006275913
1.CHECK AMBIENT SENSOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect ambient sensor connector.
3. Turn ignition switch ON.
4. Check voltage between ambient sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK AMBIENT SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp.connector.
3. Check continuity between ambient sensor har ness connector and A/C auto amp. harness connector.
Is the inspection result normal?
DTC Items
(CONSULT-III screen terms) DTC detection condition Possible cause
B257B AMBIENT SENSOR The ambient sensor recognition temperature is
too high.
 Ambient sensor
 A/C auto amp.
 Harness or connectors
(The sensor circuit is open or short-
ed.)
B257C
The ambient sensor recognition temperature is
too low.
+
−Vol tag e
(Approx.)
Ambient sensor
Connector Terminal E76 1 Ground 5 V
Ambient sensor —Continuity
Connector Terminal
E76 2 Ground Existed
Revision: 2010 May2011 QX56

HAC-78
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
B257B, B257C AMBIENT SENSOR
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK AMBIENT SENSOR
Check ambient sensor. Refer to HAC-78, "
Component Inspection".
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Replace ambient sensor. Refer to HAC-147, "
Removal and Installation".
4.CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp.connector.
3. Check continuity between ambient sensor har ness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair harness or connector.
5.CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR GROUND SHORT
Check continuity between ambient sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair harness or connector.
6.CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR POWER SHORT
1. Turn ignition switch ON.
2. Check voltage between ambient sensor harness connector and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Repair harness or connector.
Component InspectionINFOID:0000000006275914
1.CHECK AMBIENT SENSOR
1. Turn ignition switch OFF.
2. Disconnect ambient sensor connector.
3. Check resistance between ambient sensor terminals.
Ambient sensor A/C auto amp. Continuity
Connector Terminal Connector Terminal
E76 1 M50 7 Existed
Ambient sensor —Continuity
Connector Terminal
E76 1 Ground Not existed
+ −Voltage
(Approx.)
Ambient sensor
Connector Terminal E76 1 Ground 0 V
Revision: 2010 May2011 QX56

HAC-80
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
B2581, B2582 INTAKE SENSOR
B2581, B2582 INTAKE SENSOR
DTC LogicINFOID:0000000006275915
DTC DETECTION LOGIC
NOTE:
 If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
HAC-
72, "DTC Logic".
 If DTC is displayed along with DTC U1010, fi rst perform the trouble diagnosis for DTC U1010. HAC-73,
"DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” m ode of “HVAC” using CONSULT-III.
3. Check DTC.
Is DTC detected?
YES >> Refer to HAC-80, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006275916
1.CHECK INTAKE SENSOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect intake sensor connector.
3. Turn ignition switch ON.
4. Check voltage between intake sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK INTAKE SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between intake sensor har ness connector and A/C auto amp. harness connector.
Is the inspection result normal?
DTC Items
(CONSULT-III screen terms) DTC detection condition Possible cause
B2581 INTAKE SENSOR The intake sensor recognition temperature is
too high.
 Intake sensor
 A/C auto amp.
 Harness or connectors
(The sensor circuit is open or short-
ed.)
B2582
The intake sensor recognition temperature is
too low.
+
−Voltage
(Approx.)
Intake sensor
Connector Terminal M257 1 Ground 5 V
Intake sensor —Continuity
Connector Terminal
M257 2 Ground Existed
Revision: 2010 May2011 QX56

B2581, B2582 INTAKE SENSORHAC-81
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
YES >> GO TO 3.
NO >> Repair harness or connector.
3.CHECK INTAKE SENSOR
Check intake sensor. Refer to HAC-81, "
Component Inspection".
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Replace intake sensor. Refer to HAC-150, "
Removal and Installation".
4.CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between intake sensor har ness connector and A/C auto amp. harness connector.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair harness or connector.
5.CHECK INTAKE SENSOR POWER SU PPLY CIRCUIT FOR GROUND SHORT
Check continuity between intake sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair harness or connector.
6.CHECK INTAKE SENSOR POWER SU PPLY CIRCUIT FOR POWER SHORT
1. Turn ignition switch ON.
2. Check voltage between intake sensor harness connector and ground.
Is the inspection result normal?
YES >> Replace A/C auto amp.. Refer to HAC-146, "Removal and Installation".
NO >> Repair harness or connector.
Component InspectionINFOID:0000000006275917
1.CHECK INTAKE SENSOR
1. Turn ignition switch OFF.
2. Disconnect intake sensor connector.
3. Check resistance between intake sensor terminals.
Intake sensor A/C auto amp. Continuity
Connector Terminal Connector Terminal
M257 1 M50 28 Existed
Intake sensor —Continuity
Connector Terminal
M257 1 Ground Not existed
+ −Vol tag e
(Approx.)
Intake sensor
Connector Terminal M257 1 Ground 0 V
Revision: 2010 May2011 QX56

B262A, B262B, B2657, B2658 EXHAUST GAS/OUTSIDE ODOR DETECTING
SENSOR
HAC-83
< DTC/CIRCUIT DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
C
D
E
F
G H
J
K L
M A
B
HAC
N
O P
B262A, B262B, B2657, B2658 EXHAU ST GAS/OUTSIDE ODOR DETECT-
ING SENSOR
DTC LogicINFOID:0000000006275918
DTC DETECTION LOGIC
NOTE:
 If DTC is displayed along with DTC U1000, first per form the trouble diagnosis for DTC U1000. Refer to HAC-
72, "DTC Logic".
 If DTC is displayed along with DTC U1010, fi rst perform the trouble diagnosis for DTC U1010. HAC-73,
"DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch ON.
2. Select “Self Diagnostic Result” m ode of “HVAC” using CONSULT-III.
3. Check DTC.
Is DTC detected?
YES >> Refer to HAC-83, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006275919
1.CHECK FUSE
1. Turn ignition switch OFF.
2. Check 10A fuse [No.4, lo cated in fuse block (J/B)]
NOTE:
Refer to PG-140, "
Fuse, Connector and Terminal Arrangement".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.CHECK EXHAUST GAS / OUTSIDE ODOR DETECTING SENSOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect exhaust gas / outside odor detecting sensor connector.
3. Turn ignition switch ON.
4. Check voltage between exhaust gas / outside odor detecting sensor harness and ground.
DTC Items
(CONSULT-III screen terms) DTC detection condition Possible cause
B262A GAS SENSOR Exhaust gas / outside odor detecting sensor
duty ratio 15% or less.
 Exhaust gas / outside odor detect-
ing sensor
 A/C auto amp.
 Harness or connectors (The sensor circuit is open or short-
ed.)
B262B
Exhaust gas / outside odor detecting sensor
duty ratio 85% or more.
B2657 CAS SENSOR CIRCUIT Exhaust gas / outside odor detecting sensor
duty ratio 0%.
B2658 Exhaust gas / outside odor detecting sensor
duty ratio 100%.
+
−Vol tag e
(Approx.)
Exhaust gas / outside odor detect-
ing sensor
Connector Terminal E117 1 Ground Battery voltage
Revision: 2010 May2011 QX56

HAC-84
< DTC/CIRCUIT DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
B262A, B262B, B2657, B2658 EX
HAUST GAS/OUTSIDE ODOR DETECTING
SENSOR
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair harness or connector between exhaust gas / outside odor detecting sensor and fuse block
(J/B).
3.CHECK EXHAUST GAS / OUTSIDE ODOR DETECTING SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between exhaust gas / outsi de odor detecting sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair harness or connector.
4.CHECK EXHAUST GAS / OUTSIDE ODOR DETECTING SENSOR SIGNAL CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between exhaust gas / outside odor detecting sensor harness connector and ground.
Is the inspection result normal?
YES >> Replace exhaust gas / outside odor detecting sensor. Refer to HAC-151, "Removal and Installa-
tion".
NO >> GO TO 5.
5.CHECK EXHAUST GAS / OUTSIDE ODOR DETE CTING SENSOR SIGNAL CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp.connector.
3. Check continuity between exhaust gas / outside odor detecting sensor harness connector and A/C auto
amp. connector.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair harness or connector.
6.CHECK EXHAUST GAS / OUTSIDE ODOR DETE CTING SENSOR SIGNAL CIRCUIT FOR GROUND
SHORT
Check continuity between exhaust gas / outside odor detecting sensor harness connector and ground.
Is the inspection result normal?
Exhaust gas / outside odor detect- ing sensor —Continuity
Connector Terminal
E117 2 Ground Existed
+
−Voltage
(Approx.)
Exhaust gas / outside odor detect-
ing sensor
Connector Terminal E117 3 Ground 5 V
Exhaust gas / outside odor detect- ing sensor A/C auto amp.
Continuity
Connector Terminal Connector Terminal
E117 3 M50 10 Existed
Exhaust gas / outside odor detect- ing sensor —Continuity
Connector Terminal
E117 3 Ground Not existed
Revision: 2010 May2011 QX56