2011 INFINITI QX56 check engine

HAC-40
< SYSTEM DESCRIPTION >[AUTOMATIC AIR CONDITIONING]
DIAGNOSIS SYSTEM (HVAC)
ACTIVE TEST
Check each output device
COMP REQ SIG [On/Off] Displays A/C switch ON/OFF status transmitted to other units via CAN communication
FAN REQ SIG [On/Off]Displays front blower motor ON/OFF status transmitted to other units via CAN commu-
nication
FAN DUTY Duty ratio of front blower motor judged by A/C auto amp.
XM Target discharge front air temperature (driver side) judged by A/C auto amp. depending
on the temperature setting and the value from each sensor
PASS SUNL CAL [w/m
2]Sunload value (passenger side) calculated by A/C auto amp.
PASS SUNLOAD SEN [w/m
2]Sunload sensor value converted from sunload sensor signal (passenger side) received
from sunload sensor
PA TARGET A/TEMP Target discharge front air temperature (passenger side) judged by A/C auto amp. de-
pending on the temperature setting and the value from each sensor
RRIN TEMP SEN [ °C ( °F)] Rear in-vehicle sensor value converted from rear in-vehicle sensor signal received from
rear in-vehicle sensor.
RRIN TEMP CAL [ °C ( °F)] In-vehicle temperature (rear side) value calculated by A/C auto amp.
RR INT TMP CL [ °C ( °F)] Rear evaporator fin temperature value calculated by A/C auto amp.
RRFAN REQ SIG [On/Off] Displays rear blower motor ON/OFF status transmitted to other units via CAN communi-
cation
RR FAN DUTY Duty ratio of rear blower motor judged by A/C auto amp.
RR XM Target discharge rear air temperature (driver side) judged by A/C auto amp. depending
on the temperature setting and the value from each sensor
ENG COOL TEMP [ °C ( °F)] Engine coolant temperature signal value received from ECM via CAN communication
VEHICLE SPEED [km/h
(mph)] Vehicle speed signal value received from combination meter via CAN communication
Monitor item [Unit] Description
Te s t i t e m D e s c r i p t i o n
HVAC TEST The operation check of air conditioning system can be performed by selecting the mode.
Refer to the following table for the conditions of each mode.
Te s t i t e m
MODE 1 MODE 2 MODE 3 MODE 4 MODE 5 MODE 6 MODE 7
Front mode door motor posi-
tion VENT VENT B/L B/L FOOT D/F DEF
Intake door motor position REC REC 20% FRE 20% FRE FRE FRE FRE
Front air mix door motor (driver
side) position FULL COLD FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
Front air mix door motor (pas-
senger side) position FULL COLD FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
Front blower motor control sig-
nal duty ratio 35% 35% 59% 59% 89% 89% 35%
Magnet clutch ON ON ON ON OFF OFF ON
Upper ventilator door motor
position OPEN CLOSE OPEN CLOSE CLOSE CLOSE CLOSE
Rear mode door motor posi-
tion VENT VENT B/L B/L FOOT FOOT FOOT
Rear air mix door motor posi-
tion FULL COLD FULL COLD FULL COLD FULL HOT FULL HOT FULL HOT FULL HOT
Rear blower motor control sig-
nal duty ratio 35% 35% 59% 59% 89% 89% 35%
Revision: 2010 May2011 QX56

HAC-62
< BASIC INSPECTION >[AUTOMATIC AIR CONDITIONING]
OPERATION INSPECTION
OPERATION INSPECTION
FRONT AUTOMATIC AIR CONDITIONING SYSTEM
FRONT AUTOMATIC AIR CONDITIONIN
G SYSTEM : Work ProcedureINFOID:0000000006275892
DESCRIPTION
The purpose of the operational check is to che ck that the individual system operates normally.
OPERATION INSPECTION
1.CHECK MEMORY FUNCTION
1. Set temperature control dial (driver side) to 32.0 °C (90 °F).
2. Press OFF switch.
3. Turn ignition switch OFF.
4. Turn ignition switch ON.
5. Press AUTO switch.
6. Check that set temperature is maintained.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 12.
2.CHECK FRONT BLOWER MOTOR
1. Start engine.
2. Operate fan switch.
3. Check that fan speed changes. C heck operation for all fan speeds.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 12.
3.CHECK DISCHARGE AIR (MOD E SWITCH AND DEF SWITCH)
1. Operate fan switch to set the fan speed to maximum speed.
2. Operate MODE switch and DEF switch.
3. Check that air outlets change according to each indica ted air outlet by placing a hand in front of the out-
lets. Refer to VTL-6, "
VENTILATION SYSTEM (FRONT AIR CO NDITIONING) : System Description".
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 12.
4.CHECK DISCHRGE AIR (UPPER VENTILATOR SWITCH)
1. Press MODE switch to set the air outlet to other than D/F or DEF.
2. Press upper ventilator switch. The upper ventilator switch indicator is turns ON.
3. Check that air flow blows from upper ventilator.
4. Press upper ventilator switch again. The upper ventilator switch indicator is turns OFF.
5. Check that air flow from upper ventilator stops.
Is the inspection result normal?
YES-1 >> With ACCS (advanced climate control system): GO TO 5.
YES-2 >> Without ACCS (advanced clim ate control system): GO TO 6.
NO >> GO TO 12.
5.CHECK INTAKE AIR [WITH ACCS (A DVANCED CLIMATE CONTROL SYSTEM)]
1. Press intake switch to set the air inlet to recirculation. The intake switch indicator turns ON.
2. Listen to intake sound and confirm air inlets change.
3. Press intake switch again to set the air inlet to fresh air intake. The intake switch indicator turns OFF.
4. Listen to intake sound and confirm air inlets change.
Is the inspection result normal?
Check condition : Engine running at normal operating temperature.
Revision: 2010 May2011 QX56

HAC-64
< BASIC INSPECTION >[AUTOMATIC AIR CONDITIONING]
OPERATION INSPECTION
12.CHECK SELF-DIAGNOSIS WITH CONSULT-III
1. Perform self-diagnosis with CONSULT-III.
2. Check that any DTC is detected.
Is any DTC detected?
YES >> Refer to HAC-45, "DTC Index" and perform the appropriate diagnosis.
NO >> GO TO 13.
13.CHECK FAIL-SAFE ACTIVATION
Check that symptom is applied to the fail-safe activation. Refer to HAC-45, "
Fail-safe".
>> Refer to HAC-133, "
Diagnosis Chart By Symptom" and perform the appropriate diagnosis.
REAR AUTOMATIC AIR CONDITIONING SYSTEM
REAR AUTOMATIC AIR CONDITION ING SYSTEM : Work ProcedureINFOID:0000000006275893
DESCRIPTION
The purpose of the operational check is to che ck that the individual system operates normally.
NOTE:
Check that front automatic air conditioning system operates normally. Refer to HAC-133, "
Diagnosis Chart By
Symptom".
OPERATION INSPECTION
Front A/C Control Operation
1.CHECK REAR CONTROL MODE FUNCTION
1. Press REAR switch. The REAR switch indicator turns ON.
2. Check that front display changes to state indication di splay (rear control mode) and that rear automatic air
conditioning system starts.
3. Press REAR switch again. The REAR switch indicator turns OFF.
4. Check that rear control mode released. (rear aut omatic air conditioning system operates continuously)
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 8.
2.CHECK REAR BLOWER MOTOR
1. Press REAR switch.
2. Operate fan switch.
3. Check that fan speed changes. C heck operation for all fan speeds.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 8.
3.CHECK DISCHARGE AIR
1. Operate fan switch to set the fan speed to maximum speed.
2. Operate MODE switch.
3. Check that air outlets change according to each indica ted air outlet by placing a hand in front of the out-
lets. Refer to VTL-7, "
VENTILATION SYSTEM (REAR AIR CO NDITIONING) : System Description".
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 8.
4.CHECK DISCHARGE AIR TEMPERATURE
1. Operate temperature control dial (driver side). Check condition
: Engine running at normal operating temperature.
: Front air conditioning system operate.
Revision: 2010 May2011 QX56

HAC-66
< BASIC INSPECTION >[AUTOMATIC AIR CONDITIONING]
OPERATION INSPECTION
YES >> GO TO 4.
NO >> GO TO 7.
4.CHECK WITH TEMPERATURE SETTING LOWERED
1. Operate temperature control switch and lower the set temperature to 18°C.
2. Check that cool air blows from the air outlets.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 7.
5.CHECK TEMPERATURE INCREASE
1. Operate temperature control switch and raise the set temperature to 32°C.
2. Check that warm air bl ows from the air outlets.
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 7.
6.CHECK AUTO MODE
1. Press AUTO switch.
2. Operate temperature control switch to check that fan speed or air outlet changes (the air outlet or fan
speed varies depending on the ambient temperature, in-v ehicle temperature (rear side), set temperature,
and etc.).
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 7.
7.CHECK SELF-DIAGNOSIS WITH CONSULT-III
1. Perform self-diagnosis with CONSULT-III.
2. Check that any DTC is detected.
Is any DTC detected?
YES >> Refer to HAC-45, "DTC Index" and perform the appropriate diagnosis.
NO >> Refer to HAC-135, "
Diagnosis Chart By Symptom" and perform the appropriate diagnosis.
ACCS (ADVANCED CLIM ATE CONTROL SYSTEM)
ACCS (ADVANCED CLIMATE CONT ROL SYSTEM) : Work ProcedureINFOID:0000000006275894
DESCRIPTION
The purpose of the operational check is to che ck that the individual system operates normally.
NOTE:
Check that front automatic air conditi oning system operates normally. Refer to HAC-62, "
FRONT AUTOMATIC
AIR CONDITIONING SYSTEM : Work Procedure".
OPERATION INSPECTION
1.CHECK PLASMACLUSTER™ CONTROL
Check the ionizer operation sound (whirring sound) in the duc t by putting an ear to the center ventilator grille
(driver side) outlet while pressing fan switch and OFF switch alternately.
NOTE:
 Plasmacluster
™ ion technology developed by Sharp Corporation is installed in this item.
 Plasmacluster
™ is a trademark of Sharp Corporation.
Is the inspection result normal?
YES >> GO TO 2.
NO >> GO TO 4.
2.CHECK PLASMACLUSTER™ CONTROL OPERATION STATUS
Check condition : Engine running
Revision: 2010 May2011 QX56

HAC-140
< SYMPTOM DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
INSUFFICIENT HEATING
INSUFFICIENT HEATING
FRONT AIR CONDITIONER
FRONT AIR CONDITIONER : DescriptionINFOID:0000000006275990
Symptom Insufficient heating
 No warm air comes out. (Air flow volume is normal.)
FRONT AIR CONDITIONER
: Diagnosis ProcedureINFOID:0000000006275991
NOTE:
Perform self-diagnoses with on board diagnosis and CO NSULT-III before performing symptom diagnosis. If
DTC is detected, perform the corresponding diagnosis.
1.CHECK COOLING SYSTEM
1. Check engine coolant level and check leakage. Refer to CO-8, "
Inspection".
2. Check reservoir tank cap. Refer to CO-11, "
RESERVOIR TANK CAP : Inspection".
3. Check water flow sounds of the engine coolant. Refer to CO-9, "
Refilling".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Refill engine coolant and repair or repl ace parts depending on the inspection results.
2.CHECK HEATER HOSE
Check installation of heater hose by visually or touching.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace parts depending on the inspection results.
3.CHECK FRONT HEATER CORE
1. Check temperature of inlet hose and outlet hose of front heater core.
2. Check that inlet side of front heater core is hot and t he outlet side is slightly lower than/almost equal to the
inlet side.
CAUTION:
Always perform the temperature in spection in a short period of time because the engine coolant
temperature is very hot.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace front heater core. Refer to HA-44, "
HEATER CORE : Removal and Installation".
4.CHECK AIR LEAKAGE FROM EACH DUCT
Check duct and nozzle, etc. of front air conditioning system for air leakage.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace parts depending on the inspection results.
5.CHECK SETTING OF TEMPERATURE SETTING TRIMMER (FRONT)
1. Check setting value of temperature setting trimmer (front). Refer to HAC-68, "
FRONT AUTOMATIC AIR
CONDITIONING SYSTEM : Temperature Setting Trimmer (Front)".
2. Check that temperature setting trimmer (front) is set to “ − direction”.
NOTE:
The control temperature can be set by t he temperature setting trimmer (front).
3. Set difference between the set temperature and control temperature to “0”.
Are the symptoms solved?
YES >> INSPECTION END
NO >> Replace A/C auto amp.. Refer to HAC-146, "
Removal and Installation".
REAR AIR CONDITIONER
Revision: 2010 May2011 QX56

INSUFFICIENT HEATINGHAC-141
< SYMPTOM DIAGNOSIS > [AUTOMATIC AIR CONDITIONING]
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REAR AIR CONDITIONER : DescriptionINFOID:0000000006275992
Symptom
 Insufficient heating
 No warm air comes out. (Air flow volume is normal.)
REAR AIR CONDITIONER : Diagnosis ProcedureINFOID:0000000006275993
CAUTION:
Perform the self-diagnoses with on board diagnosi s and CONSULT-III before performing symptom
diagnosis. If any malfunction result or DTC is detected, perform the corresponding diagnosis.
1.CHECK COOLING SYSTEM
1. Check engine coolant level and check leakage. Refer to CO-8, "
Inspection".
2. Check reservoir tank cap. Refer to CO-11, "
RESERVOIR TANK CAP : Inspection".
3. Check water flow sounds of the engine coolant. Refer to CO-9, "
Refilling".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Refill the engine coolant and repair or replace the parts depending on the inspection results.
2.CHECK HEATER HOSE
Check installation of heater hose by visually or touching.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace parts depending on the inspection results.
3.CHECK REAR HEATER CORE
1. Check temperature of inlet hose and outlet hose of rear heater core.
2. Check that the inlet side of rear heater core is hot and the outlet side is slightly lower than/almost equal to
the inlet side.
CAUTION:
Always perform the temperature inspection in a sh ort period of time because the engine coolant
temperature is very hot.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace rear heater core. Refer to HA-48, "
HEATER CORE : Removal and Installation".
4.CHECK AIR LEAKAGE FROM EACH DUCT
Check duct and nozzle, etc. of the rear air conditioning system for air leakage.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace parts depending on the inspection results.
5.CHECK SETTING OF TEMPERATURE SETTING TRIMMER (REAR)
1. Check setting value of temperature setting trimmer (rear). Refer to HAC-69, "
REAR AUTOMATIC AIR
CONDITIONING SYSTEM : Temperature Setting Trimmer (Rear)".
2. Check that the temperature setting trimmer is set to “ − direction”.
NOTE:
The control temperature can be set by the temperature setting trimmer (rear).
3. Set the difference between the set temperature (rear) and control temperature to “0”.
Are the symptoms solved?
YES >> INSPECTION END
NO >> Replace A/C auto amp.. Refer to HAC-146, "
Removal and Installation".
Revision: 2010 May2011 QX56

HAC-142
< SYMPTOM DIAGNOSIS >[AUTOMATIC AIR CONDITIONING]
COMPRESSOR DOSE DOT OPERATE
COMPRESSOR DOSE DOT OPERATE
DescriptionINFOID:0000000006275994
Symptom: Compressor dose not operate.
Diagnosis ProcedureINFOID:0000000006275995
NOTE:
 Perform self-diagnoses with CONSULT-III before perfo
rming symptom diagnosis. If DTC is detected, per-
form the corresponding diagnosis.
 Check that refrigerant is enclosed in cooler cycle normally. If refrigerant amount is shortage from proper
amount, perform inspection of refrigerant leakage.
1.CHECK MAGNET CLUTCH OPERATION
Check magnet clutch. Refer to HAC-126, "
Component Function Check".
Does it operate normally?
YES >> GO TO 2.
NO >> Repair or replace malfunctioning parts.
2.CHECK REFRIGERANT PRESSURE SENSOR
Check refrigerant pressure sensor. Refer to EC-520, "
Component Function Check".
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace malfunctioning parts.
3.CHECK A/C AUTO AMP. OUTPUT SIGNAL
With CONSULT-III
Check “COMP REQ SIG” and “FAN REQ SIG” in “DAT A MONITOR” mode of “HVAC” using CONSULT-III.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace A/C auto amp.. Refer to HAC-146, "
Removal and Installation".
4.CHECK ECM INPUT SIGNAL
With CONSULT-III
Check “AIR COND SIG” and “HEATER FAN SW” in “D ATA MONITOR” mode of “ECM” using CONSULT-III.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Check CAN communication system. Refer to LAN-18, "
Trouble Diagnosis Flow Chart".
5.CHECK IPDM E/R INPUT SIGNAL
With CONSULT-III
1. Start engine.
Monitor item Condition Status
COMP REQ SIG A/C switch ON On
OFF Off
FAN REQ SIG Front blower motor ON On
OFF Off
Monitor item Condition Status
COMP REQ SIG A/C switch ON On
OFF Off
HEATER FAN SW Front blower motor ON On
OFF Off
Revision: 2010 May2011 QX56

PUSH-BUTTON IGNITION SWITCH ILLUMINATION CIRCUIT
INL-65
< DTC/CIRCUIT DIAGNOSIS >
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PUSH-BUTTON IGNITION SWIT CH ILLUMINATION CIRCUIT
Component Function CheckINFOID:0000000006265016
1.CHECK PUSH-BUTTON IGNITION SWITCH ILLUMINATION OPERATION
CONSULT-III ACTIVE TEST
1. Turn the ignition switch ON.
2. Select “ENGINE SW ILLUMI” of BCM (I NTELLIGENT KEY) active test item.
3. With operating the test items, check that the pus h-button ignition switch illumination turns ON/OFF.
Does the push-button ignition switch illumination turn ON/OFF?
YES >> Push-button ignition switch illumination circuit is normal.
NO >> Refer to INL-65, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006265017
1.CHECK PUSH-BUTTON IGNITION SWITCH ILLUMINATION POWER SUPPLY OUTPUT
1. Turn ignition switch OFF.
2. Lighting switch OFF.
3. Disconnect push-button ignition switch connector.
4. Check voltage between push-button ignition switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 2.
2.CHECK PUSH-BUTTON IGNITION SWITCH ILLU MINATION POWER SUPPLY OPEN CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect BCM connector.
3. Check continuity between BCM harness connector and the push-button ignition switch harness connector.
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace harnesses.
3.CHECK PUSH-BUTTON IGNITION SWITCH ILLU MINATION POWER SUPPLY SHORT CIRCUIT
Check continuity between BCM harness connector and ground.
Is the inspection result normal?
YES >> Replace BCM. Refer to BCS-81, "Removal and Installation".
On : Push-button ignition
switch illumination ON
Off : Push-button ignition switch illumination OFF
(+)
(–) Condition Vo l ta g e
(Approx.)
Push-button ignition switch
Connector Terminal
M101 3 Ground Push-button ignition
switch illuminationON Condition 12 V
OFF Condition 0 V
BCM Push-button ignition switch Continuity
Connector Terminal Connector Terminal
M71 90 M101 3 Existed
BCM GroundContinuity
Connector Terminal
M71 90 Not existed
Revision: 2010 May2011 QX56