air condition INFINITI QX56 2011 Factory Service Manual

DAS-162
< DTC/CIRCUIT DIAGNOSIS >[DCA]
C1A36 ACCELERATOR PEDAL ACTUATOR CAN COMM
C1A36 ACCELERATOR PEDAL ACTUATOR CAN COMM
DTC LogicINFOID:0000000006228106
DTC DETECTION LOGIC
NOTE:
If DTC “C1A36” is detected along with DTC “U
1000”, first diagnose the DTC “U1000”. Refer to DAS-182,
"ADAS CONTROL UNIT : DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the DCA system ON.
3. Perform “All DTC Reading” with CONSULT-III.
4. Check if the “C1A36” is detected as the current malfunction in self-diagnosis results of “ICC/ADAS”.
Is
“C1A36” detected as the current malfunction?
YES >> Refer to DAS-162, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006228107
1.CHECK ADAS CONTROL UNIT SE LF-DIAGNOSIS RESULTS
Check if “U1000” is detected ot her than “C1A36” in “Self Diagnostic Result” of “ICC/ADAS”.
Is
“U1000” detected?
YES >> Perform the CAN communication system inspecti on. Repair or replace the malfunctioning parts.
Refer to DAS-182, "
ADAS CONTROL UNIT : DTC Logic".
NO >> GO TO 2.
2.CHECK ACCELERATOR PEDAL ACTUAT OR SELF-DIAGNOSIS RESULTS
Check if the DTC is detected in “Self Diagnostic Result” of “ACCELE PEDAL ACT”.
Is any DTC detected?
YES >> Perform diagnosis on the detected DTC and repair or replace the malfunctioning parts. Refer to
DAS-108, "
DTC Index".
NO >> Replace the ADAS control unit. Refer to DAS-63, "
Removal and Installation".
DTC
(On board dis-
play) Trouble diagnosis name DTC detecting condition Possible causes
C1A36 (36) APA CAN COMM CIR If an error occurs in the signal that the accel-
erator pedal actuator transmits via ITS com-
munication  ADAS control unit
 Accelerator pedal actuator
 ITS communication system
Revision: 2010 May2011 QX56

DAS
C1A37 ACCELERATOR PEDAL ACTUATOR CAN 2DAS-163
< DTC/CIRCUIT DIAGNOSIS > [DCA]
C
D
E
F
G H
I
J
K L
M B
N P A
C1A37 ACCELERATOR PEDAL ACTUATOR CAN 2
DTC LogicINFOID:0000000006228113
DTC DETECTION LOGIC
NOTE:
If DTC “C1A37” is detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to DAS-182,
"ADAS CONTROL UNIT : DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the DCA system ON.
3. Perform “All DTC Readi ng” with CONSULT-III.
4. Check if the “C1A37” is detected as the current malfunction in self-diagnosis results of “ICC/ADAS”.
Is
“C1A37” detected as the current malfunction?
YES >> Refer to DAS-163, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006228114
1.CHECK ADAS CONTROL UNIT SELF-DIAGNOSIS RESULTS
Check if “U1000” is detected other than “C1A37” in “Self Diagnostic Result” of “ICC/ADAS”.
Is
“U1000” detected?
YES >> Perform the CAN communicati on system inspection. Repair or replace the malfunctioning parts.
Refer to DAS-182, "
ADAS CONTROL UNIT : DTC Logic".
NO >> GO TO 2.
2.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Turn the ignition switch OFF.
2. Replace the accelerator pedal assembly.
3. Turn the ignition switch ON.
4. Erases all self-diagnosis results.
5. Perform “All DTC Reading” again.
6. Check if the DTC “C1A37” is detected in self-diagnosis results of “ICC/ADAS”.
Is
“C1A37” detected?
YES >> Replace the ADAS control unit. Refer to DAS-63, "Removal and Installation".
NO >> INSPECTION END
DTC
(On board dis-
play) Trouble diagnosis name DTC detecting condition Possible causes
C1A37 (133) APA CAN CIR2 If ADAS control unit detects an error signal
that is received from accelerator pedal actu-
ator via ITS communication
Accelerator pedal actuator malfunction
Revision: 2010 May2011 QX56

DAS-164
< DTC/CIRCUIT DIAGNOSIS >[DCA]
C1A38 ACCELERATOR PEDAL ACTUATOR CAN 1
C1A38 ACCELERATOR PEDAL ACTUATOR CAN 1
DTC LogicINFOID:0000000006228115
DTC DETECTION LOGIC
NOTE:
If DTC “C1A38” is detected along with DTC “U
1000”, first diagnose the DTC “U1000”. Refer to DAS-182,
"ADAS CONTROL UNIT : DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the DCA system ON.
3. Perform “All DTC Reading” with CONSULT-III.
4. Check if the “C1A38” is detected as the current malfunction in self-diagnosis results of “ICC/ADAS”.
Is
“C1A38” detected as the current malfunction?
YES >> Refer to DAS-164, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006228116
1.CHECK ADAS CONTROL UNIT SE LF-DIAGNOSIS RESULTS
Check if “U1000” is detected ot her than “C1A38” in “Self Diagnostic Result” of “ICC/ADAS”.
Is
“U1000” detected?
YES >> Perform the CAN communication system inspecti on. Repair or replace the malfunctioning parts.
Refer to DAS-182, "
ADAS CONTROL UNIT : DTC Logic".
NO >> GO TO 2.
2.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Turn the ignition switch OFF.
2. Replace the accelerator pedal assembly.
3. Erases All self-diagnosis results.
4. Perform “All DTC Reading” again.
5. Check if the “C1A38” is detected in self-diagnosis results of “ICC/ADAS”.
Is
“C1A38” detected?
YES >> Replace the ADAS control unit. Refer to DAS-63, "Removal and Installation".
NO >> INSPECTION END
DTC
(On board dis-
play) Trouble diagnosis name DTC detecting condition Possible causes
C1A38 (132) APA CAN CIR1 If ADAS control unit detects an error signal
that is received from accelerator pedal actu-
ator via ITS communication
Accelerator pedal actuator malfunction
Revision: 2010 May2011 QX56

DAS
C1A39 STEERING ANGLE SENSORDAS-165
< DTC/CIRCUIT DIAGNOSIS > [DCA]
C
D
E
F
G H
I
J
K L
M B
N P A
C1A39 STEERING ANGLE SENSOR
DTC LogicINFOID:0000000006228117
DTC DETECTION LOGIC
NOTE:
If DTC “C1A39” is detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to DAS-182,
"ADAS CONTROL UNIT : DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the DCA system ON.
3. Perform “All DTC Readi ng” with CONSULT-III.
4. Check if the “C1A39” is detected as the current malfunction in self-diagnosis results of “ICC/ADAS”.
Is
“C1A39” detected as the current malfunction?
YES >> Refer to DAS-165, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006228118
1.CHECK SELF-DIAGNOSIS RESULTS
Check if “U1000” is detected other than “C1A39” in “Self Diagnostic Result” of “ICC/ADAS”.
Is
“U1000” detected?
YES >> Perform the CAN communicati on system inspection. Repair or replace the malfunctioning parts.
Refer to DAS-182, "
ADAS CONTROL UNIT : DTC Logic".
NO >> GO TO 2.
2.CHECK ABS ACTUATOR AND ELECTRIC UNIT (C ONTROL UNIT) SELF-DIAGNOSIS RESULTS
Check if any DTC is detected in “Self Diagnostic Result” of “ABS”.
Is any DTC detected?
YES >> Perform diagnosis on the detected DTC and repair or replace the malfunctioning parts. Refer to
BRC-51, "
DTC Index".
NO >> Replace the ADAS control unit. Refer to DAS-63, "
Removal and Installation".
DTC
(On board dis-
play) Trouble diagnosis name DTC detecting condition Possible causes
C1A39 (39) STRG SEN CIR If the steering angle sensor is malfunction Steering angle sensor
Revision: 2010 May2011 QX56

DAS-166
< DTC/CIRCUIT DIAGNOSIS >[DCA]
C1F01 ACCELERATOR PEDAL ACTUATOR
C1F01 ACCELERATOR PEDAL ACTUATOR
ADAS CONTROL UNIT
ADAS CONTROL UNIT : DTC LogicINFOID:0000000006228122
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn the ignition switch OFF.
2. Turn the ignition switch ON.
3. Slowly depress the accelerator pedal completely, and then release it.
4. Repeat step 3 several times.
5. Perform “All DTC Reading” with CONSULT-III.
6. Check if the DTC “C1F01” is detected as the curr ent malfunction on the self-diagnosis results of “ICC/
ADAS”.
Is
“C1F01” detected as the current malfunction?
YES >> Refer to DAS-166, "ADAS CONTROL UNIT : Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
ADAS CONTROL UNIT : Diagnosis ProcedureINFOID:0000000006228123
1.CHECK ADAS CONTROL UNIT SE LF-DIAGNOSIS RESULTS
Check if “U1000” is detected ot her than “C1F01” in “Self Diagnos tic Result” of “ICC/ADAS”.
Is
“U1000” detected?
YES >> Perform the CAN communication system inspecti on. Repair or replace the malfunctioning parts.
Refer to DAS-182, "
ADAS CONTROL UNIT : DTC Logic".
NO >> GO TO 2.
2.CHECK ACCELERATOR PEDAL ACTUAT OR SELF-DIAGNOSIS RESULTS
Check if “C1F01” is detected in “Self Diagnostic Result” of “ACCELE PEDAL ACT”.
Is
“C1F01” detected?
YES >> Refer to DAS-166, "ACCELERATOR PEDAL ACTUATOR : DTC Logic".
NO >> Replace the ADAS control unit. Refer to DAS-63, "
Removal and Installation".
ACCELERATOR PEDAL ACTUATOR
ACCELERATOR PEDAL ACTUATOR : DTC LogicINFOID:0000000006223586
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn the ignition switch OFF.
2. Turn the ignition switch ON.
3. Slowly depress the accelerator pedal completely, and then release it.
DTC
(On board dis- play) Trouble diagnosis name DTC detecting condition Possible causes
C1F01 (91) APA MOTOR MALF If the accelerator pedal actuator motor error
is detected Accelerator pedal actuator integrated
motor malfunction
DTC Trouble diagnosis name DTC detecting condition Possible causes
C1F01 APA MOTOR MALF If the accelerator pedal actuator motor error
is detected Accelerator pedal actuator integrated
motor malfunction
Revision: 2010 May2011 QX56

DAS-168
< DTC/CIRCUIT DIAGNOSIS >[DCA]
C1F02 ACCELERATOR PEDAL ACTUATOR
C1F02 ACCELERATOR PEDAL ACTUATOR
ADAS CONTROL UNIT
ADAS CONTROL UNIT : DTC LogicINFOID:0000000006228127
DTC DETECTION LOGIC
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the DCA system ON.
3. Perform “All DTC Reading” with CONSULT-III.
4. Check if the “C1F02” is detected as the current ma lfunction on the self-diagnosis results of “ICC/ADAS”.
Is
“C1F02” detected as the current malfunction?
YES >> Refer to DAS-168, "ADAS CONTROL UNIT : Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
ADAS CONTROL UNIT : Diagnosis ProcedureINFOID:0000000006228128
1.CHECK ADAS CONTROL UNIT SE LF-DIAGNOSIS RESULTS
Check if “U1000” is detected ot her than “C1F02” in “Self Diagnos tic Result” of “ICC/ADAS”.
Is
“U1000” detected?
YES >> Perform the CAN communication system inspecti on. Repair or replace the malfunctioning parts.
Refer to DAS-182, "
ADAS CONTROL UNIT : DTC Logic".
NO >> GO TO 2.
2.CHECK ACCELERATOR PEDAL ACTUAT OR SELF-DIAGNOSIS RESULTS
Check if “C1F02” is detected in “Self Diagnostic Result” of “ACCELE PEDAL ACT”.
Is
“C1F02” detected?
YES >> Refer to DAS-168, "ACCELERATOR PEDAL ACTUATOR : DTC Logic".
NO >> Replace the ADAS control unit. Refer to DAS-63, "
Removal and Installation".
ACCELERATOR PEDAL ACTUATOR
ACCELERATOR PEDAL ACTUATOR : DTC LogicINFOID:0000000006223590
DTC DETECTION LOGIC
ACCELERATOR PEDAL ACTUATOR : Diagnosis ProcedureINFOID:0000000006223591
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the DCA system ON.
3. Perform “All DTC Reading” with CONSULT-III.
4. Check if the “C1F02” is detected as the current malfunction on the self-diagnosis results of “ACCELE
PEDAL ACT” or “ICC/ADAS”
Is
“C1F02” detected as the current malfunction?
DTC
(On board dis- play) Trouble diagnosis name DTC detecting condition Possible causes
C1F02 (92) APA C/U MALF If the accelerator pedal actuator integrated
control unit error is detected Accelerator pedal actuator integrated
control unit malfunction
DTC Trouble diagnosis name DTC detecting condition Possible causes
C1F02 APA C/U MALF If the accelerator pedal actuator integrated
control unit error is detected Accelerator pedal actuator integrated
control unit malfunction
Revision: 2010 May2011 QX56

DAS
C1F05 ACCELERATOR PEDAL ACTUATOR POWER SUPPLY CIRCUIT
DAS-171
< DTC/CIRCUIT DIAGNOSIS > [DCA]
C
D
E
F
G H
I
J
K L
M B
N P A
C1F05 ACCELERATOR PEDAL ACTU ATOR POWER SUPPLY CIRCUIT
ADAS CONTROL UNIT
ADAS CONTROL UNIT : DTC LogicINFOID:0000000006228129
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the DCA system ON.
3. Perform “All DTC Readi ng” with CONSULT-III.
4. Check if the “C1F05” is detected as the current malfunction on the self-diagnosis results of “ICC/ADAS”.
Is
“C1F05” detected as the current malfunction?
YES >> Refer to DAS-171, "ADAS CONTROL UNIT : Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
ADAS CONTROL UNIT : Diagnosis ProcedureINFOID:0000000006228130
1.CHECK ADAS CONTROL UNIT SELF-DIAGNOSIS RESULTS
Check if “U1000” is detected other than “C1F05” in “Self Diagnostic Result” of “ICC/ADAS”.
Is
“U1000” detected?
YES >> Perform the CAN communicati on system inspection. Repair or replace the malfunctioning parts.
Refer to DAS-182, "
ADAS CONTROL UNIT : DTC Logic".
NO >> GO TO 2.
2.CHECK ACCELERATOR PEDAL ACTU ATOR SELF-DIAGNOSIS RESULTS
Check if “C1F05” is detected in “Self Diagnostic Result” of “ACCELE PEDAL ACT”.
Is
“C1F05” detected?
YES >> Refer to DAS-171, "ACCELERATOR PEDAL ACTUATOR : DTC Logic".
NO >> Replace the ADAS control unit. Refer to DAS-63, "
Removal and Installation".
ACCELERATOR PEDAL ACTUATOR
ACCELERATOR PEDAL ACTUATOR : DTC LogicINFOID:0000000006223596
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the DCA system ON.
3. Perform “All DTC Readi ng” with CONSULT-III.
DTC
(On board display) Trouble diagnosis name DTC detecting condition Possible causes
C1F05 (95) APA PWR SUPLY CIR The battery voltage sent to accelerator pedal
actuator remains less than 7.9 V or more than
19.3 V for 5 seconds  Harness, connector, or fuse
 Accelerator pedal actuator
DTC Trouble diagnosis name DTC detecting condition Possible causes
C1F05 APA PWR SUPLY CIR The battery voltage sent to accelerator pedal
actuator remains less than 7.9 V or more than
19.3 V for 5 seconds  Harness, connector, or fuse
 Accelerator pedal actuator
Revision: 2010 May2011 QX56

DAS
C1F06 CAN CIRCUIT2DAS-173
< DTC/CIRCUIT DIAGNOSIS > [DCA]
C
D
E
F
G H
I
J
K L
M B
N P A
C1F06 CAN CIRCUIT2
DTC LogicINFOID:0000000006223598
DTC DETECTION LOGIC
NOTE:
If DTC “C1F06” is detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to DAS-182,
"ACCELERATOR PEDAL ACTUATOR : DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the DCA system ON.
3. Perform “All DTC Readi ng” with CONSULT-III.
4. Check if the “C1F06” is detected as the current malfunction in “Self Diagnostic Result” of “ACCELE
PEDAL ACT”.
Is
“C1F06” detected as the current malfunction?
YES >> Refer to DAS-173, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006223599
1.CHECK SELF-DIAGNOSIS RESULTS
Check if “U1000” is detected other than “C1F06” in “Self Diagnostic Result” of “ACCELE PEDAL ACT”.
Is
“U1000” detected?
YES >> Perform the CAN communicati on system inspection. Repair or replace the malfunctioning parts.
Refer to DAS-182, "
ACCELERATOR PEDAL ACTUATOR : DTC Logic".
NO >> GO TO 2.
2.REPLACE ADAS CONTROL UNIT
1. Turn the ignition switch OFF.
2. Replace the ADAS control unit. Refer to DAS-63, "
Removal and Installation".
3. Erases All self-diagnosis results.
4. Perform “All DTC Reading” again.
5. Check if the “C1F06” is detected in self -diagnosis results of “ACCELE PEDAL ACT”.
Is
“C1F06” detected?
YES >> Replace the accelerator pedal assembly. Refer to DAS-213, "Exploded View".
NO >> INSPECTION END
DTC Trouble diagnosis name DTC detecting condition Possible causes
C1F06 CAN CIR 2 If accelerator pedal actuator detects an error
signal that is received from ADAS control unit
via ITS communication ADAS control unit
Revision: 2010 May2011 QX56

DAS-174
< DTC/CIRCUIT DIAGNOSIS >[DCA]
C1F07 CAN CIRCUIT1
C1F07 CAN CIRCUIT1
DTC LogicINFOID:0000000006223600
DTC DETECTION LOGIC
NOTE:
If DTC “C1F07” is detected along with DTC “U
1000”, first diagnose the DTC “U1000”. Refer to DAS-182,
"ADAS CONTROL UNIT : DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the DCA system ON.
3. Perform “All DTC Reading” with CONSULT-III.
4. Check if the “C1F07” is detected as the current malfunction in “Self Diagnostic Result” of “ACCELE
PEDAL ACT”.
Is
“C1F07” detected as the current malfunction?
YES >> Refer to DAS-173, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006223601
1.CHECK SELF-DIAGNOSIS RESULTS
Check if “U1000” is detected other than “C1F07” in “Self Diagnostic Result” of “ACCELE PEDAL ACT”.
Is
“U1000” detected?
YES >> Perform the CAN communication system inspecti on. Repair or replace the malfunctioning parts.
Refer to DAS-182, "
ACCELERATOR PEDAL ACTUATOR : DTC Logic".
NO >> GO TO 2.
2.REPLACE ADAS CONTROL UNIT
1. Turn the ignition switch OFF.
2. Replace the ADAS control unit. Refer to DAS-63, "
Removal and Installation".
3. Erases All self-diagnosis results.
4. Perform “All DTC Reading” again.
5. Check if the “C1F07” is detected in self-diagnosis results of “ACCELE PEDAL ACT”.
Is
“C1F07” detected?
YES >> Replace the accelerator pedal assembly. Refer to DAS-213, "Exploded View".
NO >> INSPECTION END
DTC Trouble diagnosis name DTC detecting condition Possible causes
C1F07 CAN CIR 1 If accelerator pedal actuator detects an error
signal that is received from ADAS control unit
via ITS communication ADAS control unit
Revision: 2010 May2011 QX56

DAS
U0121 VDC CAN 2DAS-175
< DTC/CIRCUIT DIAGNOSIS > [DCA]
C
D
E
F
G H
I
J
K L
M B
N P A
U0121 VDC CAN 2
DTC LogicINFOID:0000000006228131
DTC DETECTION LOGIC
NOTE:
If DTC “U0121” is detected along with DTC “U 1000”, first diagnose the DTC “U1000”. Refer to DAS-182,
"ADAS CONTROL UNIT : DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the DCA system ON.
3. Perform “All DTC Readi ng” with CONSULT-III.
4. Check if the “U0121” is detected as the current ma lfunction in “Self Diagnostic Result” of “ICC/ADAS”.
Is
“U0121” detected as the current malfunction?
YES >> Refer to DAS-175, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006228132
1.CHECK SELF-DIAGNOSIS RESULTS
Check if “U1000” is detected other than “U0121” in “Self Diagnostic Result” of “ICC/ADAS”.
Is
“U1000” detected?
YES >> Perform the CAN communicati on system inspection. Repair or replace the malfunctioning parts.
Refer to DAS-182, "
ADAS CONTROL UNIT : DTC Logic".
NO >> GO TO 2.
2.CHECK ABS ACTUATOR AND ELECTRIC UNIT (C ONTROL UNIT) SELF-DIAGNOSIS RESULTS
Check if any DTC is detected in “Self Diagnostic Result” of “ABS”.
Is any DTC detected?
YES >> Perform diagnosis on the detected DTC and repair or replace the malfunctioning parts. Refer to
BRC-51, "
DTC Index".
NO >> Replace the ADAS control unit. Refer to DAS-63, "
Removal and Installation".
DTC
(On board dis-
play) Trouble diagnosis name DTC detecting condition Possible causes
U0121 (127) VDC CAN CIR2 If ADAS control unit detects an error signal
that is received from
ABS actuator and electric
unit (control unit) via CAN communication ABS actuator and electric unit (control
unit)
Revision: 2010 May2011 QX56