service INFINITI QX56 2011 Factory Service Manual

EC-136
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DIAGNOSIS AND REPAIR WORKFLOW
1.GET INFORMATION FOR SYMPTOM
Get the detailed information from the customer about the symptom (the condition and the environment when
the incident/malfunction occurred) using t he “Diagnostic Work Sheet”. (Refer to EC-138, "
Diagnostic Work
Sheet".)
>> GO TO 2.
2.CHECK DTC
1. Check DTC.
2. Perform the following procedure if DTC is displayed.
- Record DTC and freeze frame data. (Print them out with CONSULT-III or GST.)
- Erase DTC. (Refer to “How to Erase DTC and 1st Trip DTC” in EC-63, "
CONSULT-III Function" or
EC-60, "
On Board Diagnosis Function".)
- Study the relationship between the cause detected by DTC and the symptom described by the customer.
(Symptom Matrix Chart is useful. Refer to EC-524, "
Symptom Table".)
3. Check related service bulletins for information.
Are any symptoms described and any DTCs detected?
Symptom is described, DTC is detected>>GO TO 3.
Symptom is described, DTC is not detected>>GO TO 4.
Symptom is not described, DTC is detected>>GO TO 5.
3.CONFIRM THE SYMPTOM
Try to confirm the symptom described by the customer (except MIL ON).
Also study the normal operation and fail-s afe related to the symptom. Refer to EC-529, "
Description" and EC-
93, "Fail-safe".
Diagnosis Work Sheet is useful to verify the incident.
Verify relation between the symptom and the condition when the symptom is detected.
>> GO TO 5.
4.CONFIRM THE SYMPTOM
Try to confirm the symptom described by the customer.
Also study the normal operation and fail-s afe related to the symptom. Refer to EC-529, "
Description" and EC-
93, "Fail-safe".
Diagnosis Work Sheet is useful to verify the incident.
Verify relation between the symptom and the condition when the symptom is detected.
>> GO TO 6.
5.PERFORM DTC CONFIRMATION PROCEDURE
Perform DTC CONFIRMATION PROCEDURE for the disp layed DTC, and then check that DTC is detected
again.
If two or more DTCs are detected, refer to EC-96, "
DTC Inspection Priority Chart" and determine trouble diag-
nosis order.
NOTE:
 Freeze frame data is useful if the DTC is not detected.
 Perform Component Function Check if DTC CONFIR MATION PROCEDURE is not included on Service
Manual. This simplified check procedure is an effect ive alternative though DTC cannot be detected during
this check.
If the result of Component Function Check is NG, it is the same as the detection of DTC by DTC CONFIR-
MATION PROCEDURE.
Is DTC detected?
YES >> GO TO 10.
NO >> Check according to GI-40, "
Intermittent Incident".
6.PERFORM BASIC INSPECTION
Perform EC-139, "
Work Procedure".
Revision: 2010 May2011 QX56

BASIC INSPECTIONEC-139
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BASIC INSPECTION
Work ProcedureINFOID:0000000006217739
1.INSPECTION START
1. Check service records for any recent repairs that ma y indicate a related malfunction, or a current need for
scheduled maintenance.
2. Open engine hood and check the following:
- Harness connectors for improper connections
- Wiring harness for improper connections, pinches and cut
- Vacuum hoses for splits, kinks and improper connections
- Hoses and ducts for leakage
- Air cleaner clogging
- Gasket
3. Check that electrical or mechanical loads are not applied.
- Headlamp switch is OFF.
- Air conditioner switch is OFF.
- Rear window defogger switch is OFF.
- Steering wheel is in the straight-ahead position, etc.
4. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
Check that engine stays below 1,000 rpm.
5. Run engine at approximately 2,000 rpm for approximately 2 min- utes under no load.
6. Check that no DTC is displayed with CONSULT-III or GST.
Are any DTCs detected?
YES >> GO TO 2.
NO >> GO TO 3.
2.REPAIR OR REPLACE
Repair or replace components as necessary according to corresponding Diagnosis Procedure.
>> GO TO 3
3.CHECK IDLE SPEED
1. Run engine at approximately 2,000 rpm for approximately 2 minutes under no load.
SEF983U
SEF976U
SEF977U
Revision: 2010 May2011 QX56

ADDITIONAL SERVICE WHEN REPLACING ECMEC-143
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ADDITIONAL SERVICE WHEN REPLACING ECM
DescriptionINFOID:0000000006217740
When replacing ECM, the following procedure must be performed.
Work ProcedureINFOID:0000000006217741
1.PERFORM INITIALIZATION OF IVIS (NATS) SYSTEM AND REGISTRATION OF ALL IVIS (NATS) IGNI-
TION KEY IDS
Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to SEC-
51, "ECM : Work Procedure".
>> GO TO 2.
2.PERFORM VIN REGISTRATION
Perform VIN registration. Refer to EC-145, "
Work Procedure".
>> GO TO 3.
3.PERFORM ACCELERATOR PEDAL RE LEASED POSITION LEARNING
Perform accelerator pedal released position learning. Refer to EC-146, "
Work Procedure".
>> GO TO 4.
4.PERFORM THROTTLE VALVE CL OSED POSITION LEARNING
Perform throttle valve closed position learning. Refer to EC-147, "
Work Procedure".
>> GO TO 5.
5.PERFORM IDLE AIR VOLUME LEARNING
Perform idle air volume learning. Refer to EC-148, "
Work Procedure".
>> END
Revision: 2010 May2011 QX56

EC-144
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ADDITIONAL SERVICE WHEN REPL
ACING VVEL CONTROL MODULE
ADDITIONAL SERVICE WHEN REPLACING VVEL CONTROL MODULE
DescriptionINFOID:0000000006217742
When replacing VVEL control module, t he following procedure must be performed.
Work ProcedureINFOID:0000000006217743
1.PERFORM IDLE AIR VOLUME LEARNING
Perform idle air volume learning. Refer to EC-148, "
Work Procedure".
>> END
Revision: 2010 May2011 QX56

EC-152
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MIXTURE RATIO SELF-LEARNING VALUE CLEAR
MIXTURE RATIO SELF-LEARNING VALUE CLEAR
DescriptionINFOID:0000000006217754
This describes how to erase the mixture ratio self-learni
ng value. For the actual procedure, follow the instruc-
tions in “Diagnosis Procedure”.
Work ProcedureINFOID:0000000006217755
1.START
WITH CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-III.
3. Clear mixture ratio self-learning value by touching “CLEAR”.
WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF.
3. Disconnect mass air flow sensor harness connector.
4. Restart engine and let it idle for at least 5 seconds.
5. Stop engine and reconnect mass air flow sensor harness connector.
6. Select Service $03 with GST. Check DTC P0102 is detected.
7. Select Service $04 with GST to erase the DTC P0102.
>> END
Revision: 2010 May2011 QX56

EC-156
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HOW TO SET SRT CODE
HOW TO SET SRT CODE
DescriptionINFOID:0000000006265593
OUTLINE
In order to set all SRTs, the self-diagnoses as in
the “SRT ITEM” table must have been performed at least
once. Each diagnosis may require actual driving for a long period of time under various conditions.
SRT ITEM
The table below shows required self-diagnostic items to set the SRT to “CMPLT”.
*1: Though displayed on the CONSULT-III screen, “HO2S HTR” is not SRT item.
SRT SERVICE PROCEDURE
If a vehicle has failed the state emissions inspection due to one or more SRT items indicating “INCMP”, review
the flowchart diagnostic sequence, refe rring to the following flowchart.
SRT item*1
(CONSULT-III indication)Required self-diagnostic items to set the SRT to “CMPLT” Corresponding DTC No.
CATALYST Three way catalyst function P0420, P0430
EVAP SYSTEM EVAP control system purge flow monitoring P0441
EVAP control system P0456
HO2S Air fuel ratio (A/F) sensor 1 P0130, P0133, P0150, P0153 Heated oxygen sensor 2 P0137, P0157
Heated oxygen sensor 2 P0138, P0158
Heated oxygen sensor 2 P0139, P0159
EGR/VVT SYSTEM Intake value timing control function P0011, P0021
Revision: 2010 May2011 QX56

HOW TO SET SRT CODEEC-159
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 Flat road
 Ambient air temperature: 20 - 30
°C (68 - 86 °F)
 Diagnosis is performed as quickly as possible under normal conditions.
Under different conditions [For example: ambient air temperature other than 20 - 30 °C (68 - 86 °F)], diagno-
sis may also be performed.
Work ProcedureINFOID:0000000006265595
1.CHECK DTC
Check DTC.
Is any DTC detected?
YES >> Repair malfunction(s) and erase DTC. Refer to EC-98, "DTC Index".
NO >> GO TO 2.
2.CHECK SRT STATUS
WITH CONSULT-III
Select “SRT STATUS” in “DTC & SRT CONFIRMATION” mode with CONSULT-III.
WITHOUT CONSULT-III
Perform “SRT status” mode with EC-60, "
On Board Diagnosis Function".
WITH GST
Select Service $01 with GST.
Is SRT code(s) set?
YES >> END
NO-1 >> With CONSULT-III: GO TO 3.
NO-2 >> Without CONSULT-III: GO TO 4.
3.DTC CONFIRMATION PROCEDURE
1. Select “SRT WORK SUPPORT” in “DTC & SRT CONFIRMATION” mode with CONSULT-III.
2. For SRT(s) that is not set, perform the corre sponding “DTC CONFIRMATION PROCEDURE” according to
the “Performance Priority” in t he “SRT ITEM” table. Refer to EC-156, "
Description".
3. Check DTC.
Is any DTC detected?
YES >> Repair malfunction(s) and erase DTC. Refer to EC-98, "DTC Index".
NO >> GO TO 10.
4.PERFORM ROAD TEST
 Check the “Performance Priority” in the “SRT ITEM” table. Refer to EC-156, "
Description".
 Perform the most efficient SRT set drivi ng pattern to set the SRT properly. Refer to EC-157, "
SRT Set Driv-
ing Pattern".
In order to set all SRTs, the SRT set driving pattern must be performed at least once.
>> GO TO 5.
5.PATTERN 1
1. Check the vehicle condition;
- Engine coolant temperature is −10 to 35 °C (14 to 95 °F).
- Fuel tank temperature is more than 0 °C (32 °F).
2. Start the engine.
3. Keep engine idling until the engine coolant temperature is greater than 70 °C (158 °F)
NOTE:
ECM terminal voltage is follows;
 Engine coolant temperature
- −10 to 35 °C (14 to 95 °F): 3.0 - 4.3 V
-70 °(158 °F): Less than 1.4 V
 Fuel tank temperature: Less than 4.1 V
Refer to EC-72, "
Reference Value".
>> GO TO 6.
Revision: 2010 May2011 QX56

EC-160
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HOW TO SET SRT CODE
6.PATTERN 2
1. Drive the vehicle. And depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH), then
release the accelerator pedal and keep it released for more than 10 seconds.
2. Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH) again
NOTE:
 Checking the vehicle speed with GST is advised.
 When steady-state driving is performed again even afte r it is interrupted, each diagnosis can be conducted.
In this case, the time required for diagnosis may be extended.
>> GO TO 7.
7.PATTERN 3
 Operate vehicle following the driving pattern shown in the figure.
 Release the accelerator pedal during deceleration of vehicle speed from 90 km/h (56 MPH) to 0 km/h (0 MPH).
>> GO TO 8.
8.PATTERN 4
 The accelerator pedal must be held very steady during steady-state driving.
 If the accelerator pedal is moved, the test must be conducted again.
>> GO TO 9.
9.PATTERN 5
 Cool down the engine so that the engine coolant temperature lowers between 15 - 35 °C (59 - 95 °F).
CAUTION:
Never turn the ignition switch ON while cooling down the engine.
 Engine coolant temperature at engine start is between 15 – 35 °C (59 – 95 °F) and has lowered 45 °C (113 °F)
or more since the latest engine stop.
>> GO TO 10.
10.CHECK SRT STATUS
WITH CONSULT-III
Select “SRT STATUS” in “DTC & SRT CONFIRMATION” mode with CONSULT-III.
WITHOUT CONSULT-III
Perform “SRT status” mode with EC-60, "
On Board Diagnosis Function".
WITH GST
Select Service $01 with GST.
Is SRT(s) set?
YES >> END
NO >> Call TECH LINE or take appropriate action.
PBIB2244E
Revision: 2010 May2011 QX56

EC-174
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U0113, U1003 CAN COMM CIRCUIT
>> Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace.
4.REPLACE VVEL CONTROL MODULE
Replace VVEL control module. Refer to EC-536, "
Removal and Installation".
>> GO TO 5.
5.PERFORM DTC CONFIRMATION PROCEDURE
WITH CONSULT-III
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Select “SELF DIAGNOSTIC RESULT” mode with CONSULT-III.
4. Touch “ERASE”.
5. Perform DTC Confirmation Procedure. See EC-173, "
DTC Logic".
WITH GST
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Select Service $04 with GST.
4. Perform DTC Confirmation Procedure.
See EC-173, "
DTC Logic".
Is the DTC U0113 or U1003 displayed again?
YES >> GO TO 6.
NO >> INSPECTION END
6.REPLACE ECM
Replace ECM. Refer to EC-535, "
Removal and Installation".
>> INSPECTION END
Revision: 2010 May2011 QX56

EC-176
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U1024 CAN COMM CIRCUIT
3.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace.
4.REPLACE VVEL CONTROL MODULE
1. Replace VVEL control module.
2. Perform additional service when replac ing VVEL control module. Refer to EC-144, "
Work Procedure".
>> GO TO 5.
5.PERFORM DTC CONFIRMATION PROCEDURE
WITH CONSULT-III
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Select “SELF DIAGNOSTIC RESULT” mode with CONSULT-III.
4. Touch “ERASE”.
5. Perform DTC Confirmation Procedure.
See EC-175, "
DTC Logic".
WITH GST
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Select Service $04 with GST.
4. Perform DTC Confirmation Procedure.
See EC-175, "
DTC Logic".
Is the DTC U1024 displayed again?
YES >> GO TO 6.
NO >> INSPECTION END
6.REPLACE ECM
1. Replace ECM.
2. Perform additional service when replacing ECM. Refer to EC-143, "
Work Procedure".
>> INSPECTION END
Revision: 2010 May2011 QX56