air condition INFINITI QX56 2011 Factory Service Manual

CCS-154
< DTC/CIRCUIT DIAGNOSIS >[ICC]
U1514 STRG SEN CAN 3
U1514 STRG SEN CAN 3
DTC LogicINFOID:0000000006224430
DTC DETECTION LOGIC
NOTE:
If DTC “U1514” is detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to
CCS-145,
"ADAS CONTROL UNIT : DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the MAIN switch of ICC system ON.
3. Perform “All DTC Reading” with CONSULT-III.
4. Check if the “U1514” is detected as the current ma lfunction in “Self Diagnostic Result” of “ICC/ADAS”.
Is
“U1514” detected as the current malfunction?
YES >> Refer to CCS-154, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006224431
1.CHECK SELF-DIAGNOSIS RESULTS
Check if “U1000” is detected ot her than “U1514” 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 CCS-145, "
ADAS CONTROL UNIT : DTC Logic".
NO >> GO TO 2.
2.CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 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
U1514 (165) STRG SEN CAN CIRC 3 ADAS control unit detects an error signal that is
received from steering angle sensor via CAN
communication
Steering angle sensor
Revision: 2010 May2011 QX56

CCS
U1515 ICC SENSOR CAN 3CCS-155
< DTC/CIRCUIT DIAGNOSIS > [ICC]
C
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G H
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K L
M B
N P A
U1515 ICC SENSOR CAN 3
DTC LogicINFOID:0000000006224432
DTC DETECTION LOGIC
NOTE:
If DTC “U1515” is detected along with DTC “U 1000”, first diagnose the DTC “U1000”. Refer to CCS-145,
"ADAS CONTROL UNIT : DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the MAIN switch of ICC system ON.
3. Perform “All DTC Readi ng” with CONSULT-III.
4. Check if the “U1515” is detected as the current ma lfunction in “Self Diagnostic Result” of “ICC/ADAS”.
Is
“U1515” detected as the current malfunction?
YES >> Refer to CCS-155, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006224433
1.CHECK SELF-DIAGNOSIS RESULTS
Check if “U1000” is detected other than “U1515” 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 CCS-145, "
ADAS CONTROL UNIT : DTC Logic".
NO >> GO TO 2.
2.CHECK ICC SENSOR SELF-DIAGNOSIS RESULTS
Check if any DTC is detected in “Self Diagnostic Result” of “LASER”.
Is any DTC detected?
YES >> Perform diagnosis on the detected DTC and repair or replace the malfunctioning parts. Refer to
CCS-55, "
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
U1515 (165) ICC SENSOR CAN
CIRC 3 ADAS control unit detects an error signal that is
received from ICC sensor via CAN communi-
cation
ICC sensor
Revision: 2010 May2011 QX56

CCS-156
< DTC/CIRCUIT DIAGNOSIS >[ICC]
U1517 ACCELERATOR PEDAL ACTUATOR CAN 3
U1517 ACCELERATOR PEDAL ACTUATOR CAN 3
DTC LogicINFOID:0000000006224434
DTC DETECTION LOGIC
NOTE:
If DTC “U1517” is detected along with DTC “U1000”, first diagnose the DTC “U1000”. Refer to
CCS-145,
"ADAS CONTROL UNIT : DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the MAIN switch of ICC system ON.
3. Perform “All DTC Reading” with CONSULT-III.
4. Check if the “U1517” is detected as the current ma lfunction in “Self Diagnostic Result” of “ICC/ADAS”.
Is
“U1517” detected as the current malfunction?
YES >> Refer to CCS-156, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006224435
1.CHECK SELF-DIAGNOSIS RESULTS
Check if “U1000” is detected ot her than “U1517” 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 CCS-145, "
ADAS CONTROL UNIT : DTC Logic".
NO >> GO TO 2.
2.CHECK ACCELERATOR PEDAL ACTUAT OR SELF-DIAGNOSIS RESULTS
Check if any 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
U1517 (167) APA CAN CIRC 3 ADAS control unit detects an error signal that is
received from accelerator pedal actuator via
CAN communication
Accelerator pedal actuator
Revision: 2010 May2011 QX56

CCS
U1520 4WD CAN 3CCS-157
< DTC/CIRCUIT DIAGNOSIS > [ICC]
C
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M B
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U1520 4WD CAN 3
DTC LogicINFOID:0000000006224436
DTC DETECTION LOGIC
NOTE:
If DTC “U1520” is detected along with DTC “U 1000”, first diagnose the DTC “U1000”. Refer to CCS-145,
"ADAS CONTROL UNIT : DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine.
2. Turn the MAIN switch of ICC system ON.
3. Perform “All DTC Readi ng” with CONSULT-III.
4. Check if the “U1520” is detected as the current ma lfunction in “Self Diagnostic Result” of “ICC/ADAS”.
Is
“U1520” detected as the current malfunction?
YES >> Refer to CCS-157, "Diagnosis Procedure".
NO >> Refer to GI-40, "
Intermittent Incident".
Diagnosis ProcedureINFOID:0000000006224437
1.CHECK SELF-DIAGNOSIS RESULTS
Check if “U1000” is detected other than “U1520” 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 CCS-145, "
ADAS CONTROL UNIT : DTC Logic".
NO >> GO TO 2.
2.CHECK TRANSFER CONTROL UNIT SELF-DIAGNOSIS RESULTS
Check if any DTC is detected in “Self Diagnostic Result” of “ALL MODE AWD/4WD”.
Is any DTC detected?
YES >> Perform diagnosis on the detected DTC and repair or replace the malfunctioning parts. Refer to
DLN-29, "
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
U1520 (176) 4WD CAN CIRC 3 ADAS control unit detects an error signal that is
received from transfer control unit via CAN
communication
Transfer control unit
Revision: 2010 May2011 QX56

CCS-158
< DTC/CIRCUIT DIAGNOSIS >[ICC]
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
ADAS CONTROL UNIT
ADAS CONTROL UNIT : Diagnosis ProcedureINFOID:0000000006228002
1.CHECK ADAS CONTROL UNIT POWER SUPPLY CIRCUIT
Check voltage between ADAS control unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair the ADAS control unit power supply circuit.
2.CHECK ADAS CONTROL UNIT GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect the ADAS control unit connector.
3. Check for continuity between ADAS control unit harness connector and ground.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Repair the ADAS control unit ground circuit.
ICC SENSOR
ICC SENSOR : Diagnosis ProcedureINFOID:0000000006224439
1.CHECK ICC SENSOR POWER SUPPLY CIRCUIT
Check voltage between ICC sensor harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair the ICC sensor power supply circuit.
2.CHECK ICC SENSOR GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect the ICC sensor connector.
Te r m i n a l Condition
Voltag e
(Approx.)
(+) (–)
ADAS control unit
GroundIgnition
switch
Connector Terminal
B61 16 OFF 0 V
ON Battery volt-
age
ADAS control unit
GroundContinuity
Connector Terminal
B61 6 Existed
Te r m i n a l Condition
Voltag e
(Approx.)
(+) (–)
ICC sensor
GroundIgnition
switch
Connector Terminal
E65 1 OFF 0 V
ON Battery volt-
age
Revision: 2010 May2011 QX56

CCS-164
< SYMPTOM DIAGNOSIS >[ICC]
ICC STEERING SWITCH (OTHER THAN
MAIN SWITCH) DOES NOT FUNCTION
ICC STEERING SWITCH (OTHER THAN MAIN SWITCH) DOES NOT
FUNCTION
DescriptionINFOID:0000000006224445
MAIN switch can be turned ON/OFF, but the operati on of RESUME/ACCELERATE switch, CANCEL switch,
and DISTANCE switch cannot be performed during ICC system operation.
NOTE:
Resume is not accepted when the following condition is met.
 When the MAIN switch is turned OFF once.
The set distance change is not accepted when any of the following condition is met.
 When the DCA system is turned ON.
Diagnosis ProcedureINFOID:0000000006224446
1.CHECK EACH SWITCH
1. Start the engine.
2. Check that each switch operates normally on “DAT A MONITOR” of “ICC/ADAS” with CONSULT-III.
- “RESUME/ACC SW”
- “CANCEL SW”
- “DISTANCE SW”
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 2.
2.PERFORM ALL OF THE SELF-DIAGNOSIS ITEMS
1. Perform “All DTC Reading”.
2. Check if the “U1000” is detected in “Self Diagnostic Result” of “ICC/ADAS”.
Is
“U1000” detected?
YES >> GO TO 3.
NO >> GO TO 4.
3.CAN COMMUNICATIONS INSPECTION
Check the CAN communication and repair or replace malfunctioning parts. Refer to CCS-145, "
ADAS CON-
TROL UNIT : DTC Logic".
>> INSPECTION END
4.CHECK ICC STEERING SWITCH
Check the ICC steering switch. Refer to CCS-95, "
Component Inspection".
>> GO TO 6.
5.REPLACE ADAS CONTROL UNIT
Replace the ADAS control unit. Refer to DAS-63, "
Removal and Installation".
>> GO TO 6.
6.CHECK ICC SYSTEM
1. Erase the self-diagnosis results, and then perfo rm “All DTC Reading” again after performing the action
test. (Refer to CCS-77, "
Description" for action test.)
2. Check that the ICC system is normal.
>> INSPECTION END
Revision: 2010 May2011 QX56

CCS-166
< SYMPTOM DIAGNOSIS >[ICC]
CHIME DOES NOT SOUND
CHIME DOES NOT SOUND
DescriptionINFOID:0000000006224449
Symptom check: In the following conditions, the warni
ng chime may not sound even if the vehicle distance is
short.
 When the vehicles are traveling at the same s peed and the distance between vehicles is not changing.
 When the vehicle ahead is traveling faster and t he distance between vehicles is increasing.
 The warning chime will not sound when the accelera tor pedal is depressed, overriding the system.
 The warning chime will not sound when own vehicle approaches vehicles that are parked or moving slowly.
 The warning chime does not sound when the system does not detect any vehicle ahead. (Diagnose the con-
ditions under which the system is detecting the vehicle ahead and when the system is malfunctioning. If
there is any malfunction in detecting the v ehicle ahead, check the system following the CCS-169, "
Descrip-
tion".)
Diagnosis ProcedureINFOID:0000000006224450
1.PERFORM ACTIVE TEST
Check if the warning chime sounds on the active test item “ICC BUZZER” of “ICC/ADAS” with CONSULT-III.
Does the warning chime sound?
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK THE MALFUNCTION SYMPTOM D URING WARNING CHIME OPERATION
Understand the vehicle ahead detecting condition when the malfunction occurred. If the warning chime should
have sounded, replace the ADAS control unit. Refer to DAS-63, "
Removal and Installation".
>> GO TO 8.
3.CHECK ICC WARNING CHIME CIRCUIT
Check the meter buzzer circuit. Refer to WCS-40, "
Component Function Check".
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 6.
4.PERFORM THE SELF-DIAGNOSIS
1. Perform “All DTC Reading” with CONSULT-III.
2. Check if the “U1000” is detected in self-diagnosis results of “ICC/ADAS”.
Is
“U1000” detected?
YES >> GO TO 5.
NO >> GO TO 7.
5.CAN COMMUNICATIONS SYSTEM INSPECTION
Check the CAN communication system and repair or replace malfunctioning parts. Refer to CCS-145, "
ADAS
CONTROL UNIT : DTC Logic".
>> INSPECTION END
6.REPAIR OR REPLACE MALFUNCTIONING PARTS
Repair or replace malfunctioning parts.
>> GO TO 8.
7.REPLACE ADAS CONTROL UNIT
Replace the ADAS control unit. Refer to DAS-63, "
Removal and Installation".
>> GO TO 8.
Revision: 2010 May2011 QX56

CCS-168
< SYMPTOM DIAGNOSIS >[ICC]
DRIVING FORCE IS HUNTING
DRIVING FORCE IS HUNTING
DescriptionINFOID:0000000006224451
The vehicle causes hunting when the ICC system is active.
Diagnosis ProcedureINFOID:0000000006224452
1.PERFORM SELF-DIAGNOSIS OF ECM
1. Perform “All DTC Reading” with CONSULT-III.
2. Check if the DTC is detected in self-diagnosis results of “ENGINE”. Refer to EC-98, "
DTC Index".
Is any DTC detected?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK ICC SENSOR BODY WINDOW
1. Check the vehicle driving conditions. Refer to CCS-169, "
Description".
2. Check the ICC sensor body window for contaminat ion, foreign materials, or cracks. Refer to CCS-169,
"Diagnosis Procedure".
>> INSPECTION END
3.REPAIR OR REPLACE MALFUNCTIONING PARTS
Repair or replace malfunctioning parts identified by the self-diagnosis result.
>> GO TO 4.
4.CHECK ICC SYSTEM
1. Erase the self-diagnosis results, and then perfo rm “All DTC Reading” again after performing the action
test. (Refer to CCS-77, "
Description" for action test.)
2. Check that the ICC system is normal.
>> INSPECTION END
Revision: 2010 May2011 QX56

CHG-4
< PRECAUTION >
PRECAUTIONS
5. When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button igniti on switch is turned to LOCK position.)
6. Perform self-diagnosis check of all control units using CONSULT-III.
Precaution for Power Generation Vo ltage Variable Control SystemINFOID:0000000006274856
CAUTION:
For this model, the battery current sensor that is in stalled to the battery cable at the negative terminal
measures the charging/discharging curre nt of the battery, and performs various controls. If the electri-
cal component or the ground wire is connected direct ly to the battery terminal, the current other than
that being measured with the battery current sensor is charging to or discharging from the battery.
This condition causes the malfunction of the control, and then the battery discharge may occur. Do
not connect the electrical compon ent or the ground wire directly to the battery terminal.
Revision: 2010 May2011 QX56

CHG-20
< DTC/CIRCUIT DIAGNOSIS >
L TERMINAL CIRCUIT (OPEN)
L TERMINAL CIRCUIT (OPEN)
DescriptionINFOID:0000000006274870
The “L” terminal circuit controls the charge warning lamp. The charge warning lamp illuminates when the igni-
tion switch is set to ON or START. When the alternat or is providing sufficient voltage with the engine running,
the charge warning lamp will go off. If the charge warn ing lamp illuminates with the engine running, a malfunc-
tion is indicated.
Diagnosis ProcedureINFOID:0000000006274871
1.CHECK “L” TERMINAL CONNECTION
1. Turn ignition switch OFF.
2. Check that “L” terminal is clean and tight.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair “L” terminal connection. Confirm repair by performing complete Starting/Charging system test. Refer to Technical Service Bulletin.
2.CHECK “L” TERMIN AL CIRCUIT (OPEN)
1. Disconnect alternator connector.
2. Apply ground to alternator harness connector terminal.
3. Check condition of the charge warning lamp with the ignition switch in the ON position.
Does it illuminate?
YES >> “L” terminal circuit is normal. Refer to CHG-13, "Work Flow".
NO >> GO TO 3.
3.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
1. Disconnect the battery cable from the negative terminal.
2. Disconnect the combination meter connector.
3. Check continuity between alternator harness connector and combination meter harness connector.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair the harness or connector.
4.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
Check continuity between combination me ter harness connector and fuse block (J/B).
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair the harness or connector.
5.CHECK POWER SUPPLY CIRCUIT
(+) (–) Condition Charge warning lamp
Alternator
Connector Terminal E205 3 Ground Ignition switch ON ON
Alternator Combination meter Continuity
Connector Terminal Connector Terminal
E205 3 M34 25 Existed
Combination meter Fuse block (J/B) Continuity
Connector Terminal Connector Terminal
M34 2 M1 2A Existed
Revision: 2010 May2011 QX56