Cooling INFINITI QX56 2011 Factory Service Manual

DIAGNOSIS SYSTEM (IPDM E/R)SEC-29
< SYSTEM DESCRIPTION > [WITH INTELLIGENT KEY SYSTEM]
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ACTIVE TEST
Te s t i t e m
*: Operates while the engine is running. DETENT SW
[Off/On]
Displays the status of the A/T shift selector (detention switch) judged by IPDM E/
R.
S/L RLY -REQ
[Off/On] Displays the status of the steering lock relay signal received from BCM via CAN
communication.
S/L STATE
[LOCK/UNLK/UNKWN] Displays the status of the steering lock judged by IPDM E/R.
OIL P SW
[Open/Close] Displays the status of the oil pressure switch judged by IPDM E/R.
HOOD SW
[Off/On] Displays the status of the hood switch judged by IPDM E/R.
HL WASHER REQ
[Off/On] Displays the status of the headlamp washer request signal received from BCM via
CAN communication.
THFT HRN REQ
[Off/On] Displays the status of the theft warning horn request signal received from BCM
via CAN communication.
HORN CHIRP
[Off/On] Displays the status of the horn reminder signal received from BCM via CAN com-
munication.
Monitor Item
[Unit] MAIN SIG-
NALS Description
Test item Operation Description
CORNERING LAMP LH
NOTE:
This item is indicated, but cannot be tested.
RH
HORN On Operates horn relay for 20 ms.
REAR DEFOGGER Off OFF
On Operates the rear window defogger relay.
FRONT WIPER Off OFF
Lo Operates the front wiper relay.
Hi Operates the front wiper relay and front wiper high relay.
MOTOR FAN* 1OFF
2 Transmits 50% pulse duty signal (PWM signal) to the cooling fan control module.
3 Transmits 75% pulse duty signal (PWM signal) to the cooling fan control module.
4
Transmits 100% pulse duty signal (PWM signal) to the cooling fan control mod-
ule.
HEAD LAMP WASHER On Operates the headlamp washer relay for 1 second.
EXTERNAL LAMPS Off OFF
TAIL Operates the tail lamp relay.
Lo Operates the headlamp low relay.
Hi
Operates the headlamp low relay and ON/OFF the headlamp high relay at 1 sec-
ond intervals.
Fog Operates the front fog lamp relay.
Revision: 2010 May2011 QX56

PRECAUTIONSTM-7
< PRECAUTION > [7AT: RE7R01B]
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 Disassembly should be done in a clean work area.
 Use lint-free paper or towels for wiping parts clean. Common shop rags can leave fibers that could interfere
with the operation of the transmission.
 Place disassembled parts in order for easier and proper assembly.
 All parts should be carefully cleaned with a general purpose, non-flammable solvent before inspection or
reassembly.
 Gaskets, seals and O-rings should be repl aced any time the A/T is disassembled.
 It is very important to perform func tional tests whenever they are indicated.
 The valve body contains precision parts and requires extreme care when parts are removed and serviced.
Place disassembled valve body parts in order for easier and proper assembly. Care will also prevent springs
and small parts from becoming scattered or lost.
 Properly installed valves, sleeves, plugs, etc. will slide along bores in valve body under their own weight.
 Before assembly, apply a coat of recommended ATF to all parts. Apply petroleum jelly to protect O-rings and
seals, or hold bearings and washers in place during assembly. Never use grease.
 Extreme care should be taken to avoid damage to O-rings, seals and gaskets when assembling.
 When the A/T drain plug is removed, only some of the ATF is drained. Old ATF will remain in torque con- verter and ATF cooling system.
Always follow the procedures under “Changing” when changing ATF. Refer to TM-94, "
Changing".
 Occasionally, the parking gear may be locked with the to rque insufficiently released, when stopping the vehi-
cle by shifting the selector lever from “D” or “R” to “P” position with the brake pedal depressed.
In this case, the shock with a thud caused by the abrupt release of torque may occur when shifting the selec-
tor lever from “P” posit ion to other positions.
However, this symptom is not a malfunction which results in the damage of parts.
Service Notice or PrecautionINFOID:0000000006274263
ATF COOLER SERVICE
If ATF contains frictional material (clutches, bands, etc. ), or if an A/T is repaired, overhauled, or replaced,
inspect and clean the A/T fluid cooler mounted in the radiat or or replace the radiator. Flush cooler lines using
cleaning solvent and compressed air after repair. For A/T fluid cooler cleaning procedure, refer to TM-97,
"Cleaning". For radiator replacement, refer to CO-13, "Exploded View".
Revision: 2010 May2011 QX56

TM-42
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
STRUCTURE AND OPERATION
A/T FLUID COOLER SCHEMATIC
COMPONENT DESCRIPTION
A/T fluid warmer
 The A/T fluid warmer (1) is installed on the front part of cylinder
block of engine.
 When engine is started while engine and A/T are cold, engine cool-
ant temperature rises more quickly than A/T fluid temperature. A/T
fluid warmer is provided with two circuits for ATF and engine cool-
ant respectively so that warmed engine coolant warms ATF
quickly. This helps shorten A/T warming up time, improving fuel
economy.
 A cooling effect is obtained when A/T fluid temperature is high.
A/T fluid cooler (with bypass valve)
 A/T fluid cooler (1) is installed in the front of radiator (2) and con- denser (3).
 A/T fluid cooler is provided with a bypass valve that controls ATF
flow. Bypass valve operates by thermo wax and a return spring.
Bypass valve fully opens when A/T fluid temperature is approxi-
mately 90 °C (194 °F) and fully closes when A/T fluid temperature is
approximately 100 °C (212 °F).
 When A/T fluid temperature is low, the bypass valve is open. Most of ATF therefore returns to the transmission without flowing into the
cooler core that has larger flow resistance.
JSDIA1803GB
JSDIA1811ZZ
JSDIA1814ZZ
JSDIA1815GB
Revision: 2010 May2011 QX56

SYSTEMTM-53
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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Input/Output Signal Chart
*: This signal is transmitted via communication line.
The TCM activates low brake solenoid valve and controls t he low brake oil pressure to the low pressure level
if the driver does not intend to start the vehicle while the vehicle is being stopped in the “D” position. Therefore,
the low brake is in the release (slip) status and the pow er transmission route of A/T is the same status as the
“N” position. This can decrease the engine load and im proves the fuel economy because the drive force of
engine is not transmitted to the output shaft of A/T.
Idle Neutral Contro l Start Condition
Idle neutral control starts when all of the following c onditions are satisfied. However, the control ends when
any one of the following conditions becomes insufficient during idle neutral control.
NOTE:
The idle neutral control is terminated or prohibited when the TCM and ECM detect that the vehicle is in any of
the conditions as per the following.
 Engine cooling water temperature and A/T fluid temperature are below or above a prescribed temperature.
 A/T malfunction occurs.
 DTC is detected.
 Fail-safe mode activates.
 Idle neutral control is performed continuously for a certain period of time.
Idle Neutral Contro l Resume Condition
Idle neutral control can be resumed when its start condition is fulfilled after any of the following operations is
performed (unless a malfunction occurs in the vehicle).
 After driving at more than a prescribed speed.
 When idle neutral control start conditions are fulfilled for a certain period of time.
SHIFT PATTERN CONTROL
Item Signal
TCM function Actuator
Each sensor, switch and
control unit ⇒ TCM TCM
⇒ ECM ECM ⇒ TCM
Input speed sensor 1, 2 Input speed
N idle instruction
signal (Standby sig- nal)* N idle instruction
signal (Start signal)* Idle neutral con-
trol Low brake sole-
noid valve
Output speed sensor Output shaft revolution
A/T fluid temperature
sensor
ATF temperature
Transmission range
switch Selector lever position
ECM Engine speed signal*
Accelerator pedal posi-
tion signal*
Throttle position signal*
BCM Stop lamp switch signal*
Turn indicator signal*
ABS actuator electric
unit (control unit) Pressure sensor signal*
Decel G sensor signal*
Combination meter Vehicle speed signal*
Driving location : Level road and gentle slope
Selector lever position : “D” position
Vehicle speed : 0 km/h (0 MPH)
Accelerator pedal opening : 0.0 / 8
Brake pedal : Depress
Engine speed : Idle speed
Snow mode switch : OFF
Turn signal lamp and ha zard warning lamp : OFF
Revision: 2010 May2011 QX56

VENTILATION SYSTEMVTL-7
< SYSTEM DESCRIPTION >
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VENTILATION SYSTEM (R EAR AIR CONDITIONING)
VENTILATION SYSTEM (REAR AIR CONDI TIONING) : System Description
INFOID:0000000006276285
OUTLINE
Rear cooling system is controlled by rear blower switch. Refer to HAC-23, "REAR AUTOMATIC AIR CONDI-
TIONING SYSTEM : System Description".
AIR FLOW
AIR DISTRIBUTION
Rear A/C Unit
JMIIA0649ZZ
Discharge air flow
Mode position Air outlet/distribution
VENT (1) FOOT (2)
× —
××
— ×
Revision: 2010 May2011 QX56

VTL-12
< REMOVAL AND INSTALLATION >
DUCT AND GRILLE
Install in the reverse order of removal.
REAR FLOOR GRILLE
REAR FLOOR GRILLE : Removal and InstallationINFOID:0000000006276298
REMOVAL
Disengage fixing metal clips, and then remove rear floor grille.
INSTALLATION
Install in the reverse order of removal.
FOOT DUCT
FOOT DUCT : Removal and InstallationINFOID:0000000006276299
REMOVAL
1. Remove steering member. Refer to HA-42, "HEATER & COOLING UNIT ASSEMBLY : Removal and
Installation".
2. Remove fixing screws, and then remove foot duct.
INSTALLATION
Install in the reverse order of removal.
FOOT GRILLE
FOOT GRILLE : Removal and InstallationINFOID:0000000006276300
REMOVAL
Driver side
1. Remove instrument lower panel RH. Refer to IP-14, "Removal and Installation".
2. Remove fixing screws, and then remove foot grille.
Passenger side
1. Remove instrument lower cover. Refer to IP-14, "Removal and Installation".
2. Remove fixing screws and clip, and then remove foot grille.
INSTALLATION
Install in the reverse order of removal.
REAR VENTILATOR DUCT LOWER
REAR VENTILATOR DUCT LOWER : Removal and InstallationINFOID:0000000006276301
REMOVAL
1. Remove luggage side lower finisher RH. Refer to INT-36, "LUGGAGE SIDE LOWER FINISHER :
Removal and Installation".
2. Remove mounting bolts, and then remove rear ventilator duct lower.
INSTALLATION
Install in the reverse order of removal.
REAR VENTILATOR DUCT UPPER
REAR VENTILATOR DUCT UPPER : Removal and InstallationINFOID:0000000006276302
REMOVAL
1. Remove back pillar garnish RH. Refer to INT-37, "BACK PILLAR GARNISH : Removal and Installation".
2. Remove mounting bolt, and then remove rear ventilator grille upper.
INSTALLATION
Install in the reverse order of removal.
Revision: 2010 May2011 QX56

VTL-14
< REMOVAL AND INSTALLATION >
BLOWER UNIT
BLOWER UNIT
Exploded ViewINFOID:0000000006276305
REMOVAL
DISASSEMBLY
1. Heater & cooling unit assembly 2. Steering member 3. Instrument stay LH
4. Instrument stay RH 5. Blower unit assembly
Refer to GI-4, "
Components" for symbols in the figure.
JMIIA0628GB
Revision: 2010 May2011 QX56

BLOWER UNITVTL-15
< REMOVAL AND INSTALLATION >
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Removal and InstallationINFOID:0000000006276306
REMOVAL
1. Remove A/C unit assembly. Refer to HA-42, "HEATER & COOLING UNIT ASSEMBLY : Removal and
Installation".
2. Remove mounting bolts, and then disconnect heater & cooling unit assembly and blower unit assembly.
INSTALLATION
Install in the reverse order of removal.
1. Shutter box case RH 2. Shutter box upper case 3. Packing
4. Bellmouth ring 5. Blower unit bracket 6. Intake upper case
7. Intake lower case 8. Blower motor assembly 9. Packing
10. Shutter box case LH 11. Intake door motor 12. Intake door
13. In-cabin microfilter 14. Filter cover
JMIIA0642ZZ
Revision: 2010 May2011 QX56

WW-20
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (IPDM E/R)
CONSULT-III Function (IPDM E/R)
INFOID:0000000006349815
APPLICATION ITEM
CONSULT-III performs the following functions via CAN communication with IPDM E/R.
SELF DIAGNOSTIC RESULT
Refer to PCS-22, "DTCIndex".
DATA MONITOR
Monitor item
Oil pressure warning lamp does not operate Perform auto active test.
Does the oil pressure warning
lamp blink?YES
 Harness or connector be-
tween IPDM E/R and oil
pressure switch
 Oil pressure switch
IPDM E/R
NO  CAN communication signal
between IPDM E/R and
BCM
 CAN communication signal
between BCM and combi-
nation meter
 Combination meter
Symptom Inspection contents Possible cause
Diagnosis mode Description
Ecu Identification Allows confirmation of IPDM E/R part number.
Self Diagnostic Result Displays the diagnosis results judged by IPDM E/R.
Data Monitor Displays the real-time input/output data from IPDM E/R input/output data.
Active Test IPDM E/R can provide a drive signal to electronic components to check their operations.
CAN Diag Support Monitor The results of transmit/receive diagnosis of CAN communication can be read.
Monitor Item [Unit] MAIN SIG-
NALS Description
RAD FAN REQ
[1/2/3/4] ×Displays the value of the cooling fan speed request signal received from ECM via
CAN communication.
AC COMP REQ
[Off/On] ×Displays the status of the A/C compressor request signal received from ECM via
CAN communication.
TA I L & C L R R E Q
[Off/On] ×
Displays the status of the position light request signal received from BCM via CAN
communication.
HL LO REQ
[Off/On] ×Displays the status of the low beam request signal received from BCM via CAN
communication.
HL HI REQ
[Off/On] ×Displays the status of the high beam request signal received from BCM via CAN
communication.
FR FOG REQ
[Off/On] ×Displays the status of the front fog light request signal received from BCM via
CAN communication.
FR WIP REQ
[Stop/1LOW/Low/Hi] ×
Displays the status of the front wiper request signal received from BCM via CAN
communication.
WIP AUTO STOP
[STOP P/ACT P] ×
Displays the status of the front wiper auto stop signal judged by IPDM E/R.
WIP PROT
[Off/BLOCK] ×
Displays the status of the front wiper fail-safe operation judged by IPDM E/R.
IGN RLY1 -REQ
[Off/On] Displays the status of the ignition switch ON signal received from BCM via CAN
communication.
IGN RLY
[Off/On] ×
Displays the status of the ignition relay judged by IPDM E/R.
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (IPDM E/R)WW-21
< SYSTEM DESCRIPTION >
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ACTIVE TEST
Te s t i t e m
PUSH SW
[Off/On] Displays the status of the push-button ignition switch judged by IPDM E/R.
INTER/NP SW
[Off/On] Displays the status of the shift position judged by IPDM E/R.
ST RLY CONT
[Off/On] Displays the status of the starter relay status signal received from BCM via CAN
communication.
IHBT RLY -REQ
[Off/On] Displays the status of the starter control relay signal received from BCM via CAN
communication.
ST/INHI RLY
[Off/ ST ON/INHI ON/UNKWN] Displays the status of the starter relay and starter control relay judged by IPDM
E/R.
DETENT SW
[Off/On] Displays the status of the A/T shift selector (detention switch) judged by IPDM E/
R.
S/L RLY -REQ
[Off/On] Displays the status of the steering lock relay signal received from BCM via CAN
communication.
S/L STATE
[LOCK/UNLK/UNKWN] Displays the status of the steering lock judged by IPDM E/R.
OIL P SW
[Open/Close] Displays the status of the oil pressure switch judged by IPDM E/R.
HOOD SW
[Off/On] Displays the status of the hood switch judged by IPDM E/R.
HL WASHER REQ
[Off/On] Displays the status of the headlamp washer request signal received from BCM via
CAN communication.
THFT HRN REQ
[Off/On] Displays the status of the theft warning horn request signal received from BCM
via CAN communication.
HORN CHIRP
[Off/On] Displays the status of the horn reminder signal received from BCM via CAN com-
munication.
Monitor Item
[Unit] MAIN SIG-
NALS Description
Test item Operation Description
CORNERING LAMP LH
NOTE:
This item is indicated, but cannot be tested.
RH
HORN On Operates horn relay for 20 ms.
REAR DEFOGGER Off OFF
On Operates the rear window defogger relay.
FRONT WIPER Off OFF
Lo Operates the front wiper relay.
Hi Operates the front wiper relay and front wiper high relay.
MOTOR FAN* 1OFF
2 Transmits 50% pulse duty signal (PWM signal) to the cooling fan control module.
3 Transmits 75% pulse duty signal (PWM signal) to the cooling fan control module.
4
Transmits 100% pulse duty signal (PWM signal) to the cooling fan control mod-
ule.
HEAD LAMP WASHER On Operates the headlamp washer relay for 1 second.
Revision: 2010 May2011 QX56