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![INFINITI QX56 2011 Factory Service Manual
B2517 VEHICLE SPEED SIGNALEXL-75
< DTC/CIRCUIT DIAGNOSIS > [XENON TYPE]
C
D
E
F
G H
I
J
K
M A
B
EXL
N
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B2517 VEHICLE SPEED SIGNAL
DTC LogicINFOID:0000000006213938
DTC DETECTION LOGIC
DTC CONFIRMAT INFINITI QX56 2011 Factory Service Manual
B2517 VEHICLE SPEED SIGNALEXL-75
< DTC/CIRCUIT DIAGNOSIS > [XENON TYPE]
C
D
E
F
G H
I
J
K
M A
B
EXL
N
O P
B2517 VEHICLE SPEED SIGNAL
DTC LogicINFOID:0000000006213938
DTC DETECTION LOGIC
DTC CONFIRMAT](/manual-img/42/57033/w960_57033-2784.png)
B2517 VEHICLE SPEED SIGNALEXL-75
< DTC/CIRCUIT DIAGNOSIS > [XENON TYPE]
C
D
E
F
G H
I
J
K
M A
B
EXL
N
O P
B2517 VEHICLE SPEED SIGNAL
DTC LogicINFOID:0000000006213938
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC ERASE
Erase the DTC memory of AFS with CONSULT-III.
>> GO TO 2.
2.DTC CONFIRMATION
1. Turn ignition ON.
2. Select the self-diagnos is with CONSULT-III.
3. Check the self-diagnosis result. Refer to EXL-39, "
DTC Index".
Is DTC
“B2517” detected?
YES >> Refer to EXL-75, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006213939
1.COMBINATION METER SELF-DIAGNOSIS
Check the self-diagnosis result wit h CONSULT-III. Check that the co mbination meter does not detect any
DTCs.
Is any DTC detected?
YES >> Check the combination meter Refer to MWI-43, "DTC Index".
NO >> GO TO 2.
2.DTC ERASE
Erase the DTC memory of AFS with CONSULT-III.
Is the memory erased?
YES >> INSPECTION END.
NO >> Replace AFS control unit. Refer to EXL-135, "
Removal and Installation"
DTC No. Trouble diagnosis name DTC detection condition Possible causes
B2517 Vehicle speed signal The vehicle speed signal is not re-
ceived. Combination meter
AFS control unit
Revision: 2010 May2011 QX56
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EXL-76
< DTC/CIRCUIT DIAGNOSIS >[XENON TYPE]
B2519 LEVELIZER CALIBRATION
B2519 LEVELIZER CALIBRATION
DTC LogicINFOID:0000000006213940
Diagnosis ProcedureINFOID:0000000006213941
1.LEVELIZER ADJUSTMENT
Perform the levelizer adjustment.
>> Refer to EXL-61, "
LEVELIZER ADJUSTMENT : Special Repair Requirement".
DTC No. Trouble diagnosis name DTC detection condition Possible causes
B2519 Levelizer calibration The height sensor adjustment position is not
recognized.AFS control unit
Revision: 2010 May2011 QX56
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![INFINITI QX56 2011 Factory Service Manual
B2521 ECU CIRCUITEXL-77
< DTC/CIRCUIT DIAGNOSIS > [XENON TYPE]
C
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G H
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M A
B
EXL
N
O P
B2521 ECU CIRCUIT
DTC LogicINFOID:0000000006213942
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DT INFINITI QX56 2011 Factory Service Manual
B2521 ECU CIRCUITEXL-77
< DTC/CIRCUIT DIAGNOSIS > [XENON TYPE]
C
D
E
F
G H
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M A
B
EXL
N
O P
B2521 ECU CIRCUIT
DTC LogicINFOID:0000000006213942
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DT](/manual-img/42/57033/w960_57033-2786.png)
B2521 ECU CIRCUITEXL-77
< DTC/CIRCUIT DIAGNOSIS > [XENON TYPE]
C
D
E
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G H
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J
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M A
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EXL
N
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B2521 ECU CIRCUIT
DTC LogicINFOID:0000000006213942
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC ERASE
Erase the DTC memory of AFS with CONSULT-III.
>> GO TO 2.
2.DTC CONFIRMATION PROCEDURE
1. Turn ignition ON.
2. Select the self-diagnos is with CONSULT-III.
3. Check the self-diagnosis result. Refer to EXL-39, "
DTC Index".
Is DTC
“B2521” detected?
YES >> Refer to EXL-77, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006213943
1.CHECK EACH SENSOR POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between AFS cont rol unit harness connector and ground.
Is the measurement value within the standard value?
YES >> GO TO 2.
Less than the standard value >>GO TO 3.
Higher than the standard value>>GO TO 4.
2.CHECK EACH SENSOR SIGNAL
Check voltage between AFS control unit harness connector and ground.
DTC No. Trouble diagnosis name Error detection condition Possible cause
B2512 ECU circuit AFS control unit indicates an applicable
DTC when detecting any of the following
conditions continuously for 2 seconds or
more.
- The swivel position sensor is shorted to
the power supply or the ground.
- The swivel position sensor signal is shorted to the ground.
- The height sensor power supply is short- ed to the power supply or the ground.
- The height sensor signal is shorted to
the ground.
AFS control unit RAM/ROM error Swivel position sensor
Swivel position sensor
Harness and connector
AFS control unit
Height sensor
Height sensor
Harness and connector
AFS control unit
AFS control unit (RAM/
ROM)
AFS control unit
(+)
(− ) Vol tag e
(Approx.)
AFS control unit
Connector Terminal
M135 4
Ground 5 V
5
6
24
Revision: 2010 May2011 QX56
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![INFINITI QX56 2011 Factory Service Manual
EXL-78
< DTC/CIRCUIT DIAGNOSIS >[XENON TYPE]
B2521 ECU CIRCUIT
Is the measurement value within the standard value?
YES >> Replace AFS control unit. Refer to
EXL-135, "Removal and Installation"
Less INFINITI QX56 2011 Factory Service Manual
EXL-78
< DTC/CIRCUIT DIAGNOSIS >[XENON TYPE]
B2521 ECU CIRCUIT
Is the measurement value within the standard value?
YES >> Replace AFS control unit. Refer to
EXL-135, "Removal and Installation"
Less](/manual-img/42/57033/w960_57033-2787.png)
EXL-78
< DTC/CIRCUIT DIAGNOSIS >[XENON TYPE]
B2521 ECU CIRCUIT
Is the measurement value within the standard value?
YES >> Replace AFS control unit. Refer to
EXL-135, "Removal and Installation"
Less than the standard value >>GO TO 5.
Higher than the standard value>>GO TO 6.
3.CHECK EACH SENSOR POWER SUPPLY SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. Check continuity between AFS control unit harness connector and ground.
Is the inspection result normal?
YES >> Replace AFS control unit. Refer to EXL-135, "Removal and Installation"
NO >> Repair or replace harness.
4.CHECK EACH SENSOR POWER SUPPLY SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. Check voltage between AFS control unit harness connector and ground.
Is the inspection result normal?
YES >> Replace AFS control unit. Refer to EXL-135, "Removal and Installation"
NO >> Repair or replace harness.
5.CHECK EACH SENSOR SIGNAL SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. Check continuity between AFS control unit harness connector and ground.
(+)
(− ) Vo l ta g e
(Approx.)
AFS control unit
Connector Terminal
M135 9
Ground 0.25 - 4.75 V
23
28
29
AFS control unit
GroundContinuity
Connector Terminal
M135 4
Not existed
5
6
24
(+) (− ) Vo l ta g e
(Approx.)
AFS control unit
Connector Terminal
M135 4
Ground 0 V
5
6
24
Revision: 2010 May2011 QX56
Page 2789 of 5598
B2521 ECU CIRCUITEXL-79
< DTC/CIRCUIT DIAGNOSIS > [XENON TYPE]
C
D
E
F
G H
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J
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M A
B
EXL
N
O P
Is the inspection result normal?
YES >> Replace AFS control unit. Refer to EXL-135, "Removal and Installation"
NO >> Repair or replace harness.
6.CHECK EACH SENSOR SIGNAL SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. Turn ignition switch ON.
4. Check voltage between AFS cont rol unit harness connector and ground.
Is the inspection result normal?
YES >> Replace AFS control unit. Refer to EXL-135, "Removal and Installation"
NO >> Repair or replace harness.
AFS control unit
GroundContinuity
Connector Terminal
M135 9
Not existed
23
28
29
(+)
(− ) Vol tag e
(Approx.)
AFS control unit
Connector Terminal
M135 9
Ground 0 V
23
28
29
Revision: 2010 May2011 QX56
Page 2790 of 5598
![INFINITI QX56 2011 Factory Service Manual
EXL-80
< DTC/CIRCUIT DIAGNOSIS >[XENON TYPE]
C0126 STEERING ANGLE SENSOR SIGNAL
C0126 STEERING ANGLE SENSOR SIGNAL
DTC LogicINFOID:0000000006213944
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DT INFINITI QX56 2011 Factory Service Manual
EXL-80
< DTC/CIRCUIT DIAGNOSIS >[XENON TYPE]
C0126 STEERING ANGLE SENSOR SIGNAL
C0126 STEERING ANGLE SENSOR SIGNAL
DTC LogicINFOID:0000000006213944
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DT](/manual-img/42/57033/w960_57033-2789.png)
EXL-80
< DTC/CIRCUIT DIAGNOSIS >[XENON TYPE]
C0126 STEERING ANGLE SENSOR SIGNAL
C0126 STEERING ANGLE SENSOR SIGNAL
DTC LogicINFOID:0000000006213944
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC ERASE
Erase the DTC memory of AFS with CONSULT-III.
>> GO TO 2.
2.DTC CONFIRMATION
1. Start the engine.
2. Turn the steering wheel to the maximum right/left.
3. Select the self-diagnosis with CONSULT-III.
4. Check the self-diagnosis result. Refer to EXL-39, "
DTC Index".
Is DTC
“C0126” detected?
YES >> Refer to EXL-80, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006213945
1.ABS ACTUATOR AND ELECTRICAL UNIT (CONTROL UNIT) SELF-DIAGNOSIS
Check the self-diagnosis result with CONSULT-III. C heck that ABS actuator and electrical unit (control unit)
does not detect any DTCs.
Is any DTC detected?
YES >> Check ABS actuator and electrical unit (control unit).Refer to BRC-51, "DTC Index".
NO >> GO TO 2.
2.DTC ERASE
Erase DTC memory of AFS with CONSULT-III.
Is the memory erased?
YES >> Inspection end.
NO >> Replace AFS control unit. Refer to EXL-135, "
Removal and Installation"
DTC No. Trouble diagnosis name DTC detection condition Possible causes
C0126 Steering angle sensor signal In any of the following conditions
The steering angle sensor signal
is not received.
The steering angle sensor signal error is received.
Out-of-standard signal (-900 °-
+900 °) is received. Steering angle sensor
AFS control unit
Revision: 2010 May2011 QX56
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C0428 STEERING ANGLE SENSOR CALIBRATIONEXL-81
< DTC/CIRCUIT DIAGNOSIS > [XENON TYPE]
C
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G H
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M A
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EXL
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C0428 STEERING ANGLE SENSOR CALIBRATION
DTC LogicINFOID:0000000006213946
Diagnosis ProcedureINFOID:0000000006213947
1.STEERING ANGLE SENSOR NEUTRAL POSITION ADJUSTMENT
Perform the steering angle sens or neutral position adjustment.
CAUTION:
Perform the steering angle sensor neutral position adjustment on VDC side. VDC may activate incor-
rectly.
>> Refer to BRC-64, "
Work Procedure".
DTC No. Trouble diagnosis name DTC detection condition Possible causes
C0428 Steering angle sensor calibration The steering angle sensor neutral
position is not recognized.Steering angle sensor
Revision: 2010 May2011 QX56
Page 2792 of 5598
![INFINITI QX56 2011 Factory Service Manual
EXL-82
< DTC/CIRCUIT DIAGNOSIS >[XENON TYPE]
U1000 CAN COMM CIRCUIT
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000006213948
CAN (Controller Area Network) is the serial transmissi
on for real time a INFINITI QX56 2011 Factory Service Manual
EXL-82
< DTC/CIRCUIT DIAGNOSIS >[XENON TYPE]
U1000 CAN COMM CIRCUIT
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000006213948
CAN (Controller Area Network) is the serial transmissi
on for real time a](/manual-img/42/57033/w960_57033-2791.png)
EXL-82
< DTC/CIRCUIT DIAGNOSIS >[XENON TYPE]
U1000 CAN COMM CIRCUIT
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000006213948
CAN (Controller Area Network) is the serial transmissi
on for real time application. CAN is the multiplex com-
munication for the vehicle with superior data transmi ssion speed and error detection ability. Many electronic
control units are equipped on the vehicle. These control units do not operate individually, but associates with
other control units by sharing information. In CA N communication, each control unit is connected with two
communication lines (CAN-H and CAN-L). Much inform ation is transmitted with fewer communication lines
than before. Each control unit transmits/rec eives data and reads the necessary data only.
CAN Communication Signal Chart. Refer to LAN-27, "
CAN COMMUNICATION SYSTEM : CAN System Spec-
ification Chart".
DTC LogicINFOID:0000000006213949
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000006213950
1.PERFORM SELF DIAGNOSTIC
1. Turn ignition switch ON and wait for 2 seconds or more.
2. Check “Self Diagnostic Result”.
Is
“CAN COMM CIRCUIT” displayed?
YES >> Refer to LAN-18, "Trouble Diagnosis Flow Chart".
NO >> Refer to GI-40, "
Intermittent Incident".
DTC No. Trouble diagnosis name DTC detection condition Possible causes
U1000 CAN communication circuit When AFS control unit does not trans-
mit/receive CAN communication signal
continuously for 2 seconds or more
CAN communication system
Revision: 2010 May2011 QX56