2009 INFINITI QX56 check engine

MA-26
< ON-VEHICLE MAINTENANCE >
CHASSIS AND BODY MAINTENANCE
Changing Transfer Fluid
INFOID:0000000004215546
CAUTION:
If using the vehicle for towing, the transfer fluid must be replaced as specified. Refer to MA-8, "
Intro-
duction of Periodic Maintenance".
DRAINING
1. Stop engine.
2. Remove the drain plug and gasket and drain the fluid.
3. Install the drain plug with a new gasket to the transfer. Tighten to
the specified torque. Refer to DLN-142, "
Disassembly and
Assembly".
CAUTION:
Do not reuse gasket.
FILLING
1. Remove the filler plug and gasket.
2. Fill the transfer with new fluid until the fluid level reaches the specified limit near the filler plug hole.
CAUTION:
Carefully fill fluid. (Fil l up for approx. 3 minutes.)
3. Leave the vehicle for 3 minutes, and check fluid level again.
4. Install the filler plug with a new gasket to the transfer. Tighten to the specified torque. Refer to DLN-142, "
Disassembly and
Assembly".
CAUTION:
Do not reuse gasket.
Checking Propeller ShaftINFOID:0000000003777001
Check the front and rear propeller shafts for damage, dents, and cracks. Check the joints for looseness and
any damage. Repair or replace as necessary.
Checking Front Final Drive OilINFOID:0000000004215541
DIFFERENTIAL GEAR OIL LEAKAGE AND LEVEL
1. Make sure that differential gear oil is not leaki ng from the front final drive assembly or around it.
2. Check the differential gear oil level from the filler plug hole as shown.
CAUTION:
Do not start engine while checki ng differential gear oil level.
3. Install the filler plug with sealant applied on the threads to the front final drive assembly. Tighten to the specified torque. Refer
to DLN-217, "
Disassembly and Assembly".
• Use High Performance Thread Sealant or equivalent. Refer to GI-15, "
Recommended Chemical Products and Sealants".
SDIA3208E
Fluid grade and capacity : Refer to MA-12, "Fluids and
Lubricants".
SDIA3209E
LDIA0176E
Revision: December 20092009 QX56

CHASSIS AND BODY MAINTENANCEMA-27
< ON-VEHICLE MAINTENANCE >
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Changing Front Final Drive OilINFOID:0000000004215542
DRAINING
1. Stop the engine.
2. Remove the drain plug from the front final drive assembly to drain the differential gear oil.
3. Install the drain plug with sealant applied on the thr
eads to the front final drive assembly. Tighten to the
specified torque. Refer to DLN-217, "
Disassembly and Assembly".
• Use High Performance Thread Sealant or equivalent. Refer to GI-15, "
Recommended Chemical Prod-
ucts and Sealants".
FILLING
1. Remove the filler plug from the front final drive assembly.
2. Fill the front final drive assembly with new differential gear oil
until the level reaches the specified level near the filler plug hole.
3. Install the filler plug with sealant applied on the threads to the front final drive assembly. Tighten to the specified torque. Refer
to DLN-217, "
Disassembly and Assembly".
• Use High Performance Thread Sealant or equivalent. Refer to
GI-15, "
Recommended Chemical Products and Sealants".
Checking Rear Final Drive OilINFOID:0000000004215543
OIL LEAKAGE AND OIL LEVEL
1. Make sure that differential gear oil is not leaking from the rear final drive assembly or around it.
2. Check the differential gear oil level from the filler plug hole as shown.
CAUTION:
Do not start engine while checki ng differential gear oil level.
3. Install the filler plug with a new gasket on it to the rear final drive assembly. Tighten to the specified torque. Refer to DLN-253,
"Disassembly and Assembly".
CAUTION:
Do not reuse gasket.
Changing Rear Final Drive OilINFOID:0000000004215544
DRAINING
1. Stop the engine.
2. Remove the drain plug and gasket from the rear final drive assembly to drain the differential gear oil.
3. Install the drain plug with a new gasket to the rear final drive assembly. Tighten to the specified torque. Refer to DLN-253,
"Disassembly and Assembly".
CAUTION:
Do not reuse gasket.
FILLING
Differential gear oil
grade and capacity : Refer to
MA-12, "Fluids
and Lubricants".
LDIA0176E
LLIA0068E
LLIA0068E
Revision: December 20092009 QX56

MA-30
< ON-VEHICLE MAINTENANCE >
CHASSIS AND BODY MAINTENANCE
Checking Brake Fluid Level and Leaks
INFOID:0000000003777006
• Check the brake fluid level in the reservoir tank. It should be between the “MAX” and “MIN” lines on the reservoir tank.
• If the fluid level is extremely low, check the brake system.
• If the brake warning lamp comes on when the fluid is at the correct level, check the brake fluid level switch and the parking brake
switch.
• Visually check around reservoir tank for fluid leaks.
Checking Brake Line and CablesINFOID:0000000003777007
1. Check the brake lines and hoses for cracks, deterioration, and other damage. Replace any damaged parts.
CAUTION:
If brake fluid leaks are visible around the brake line joints,
retighten the joint, or replace damaged parts as necessary.
2. Check for brake fluid leaks by fully depressing brake pedal while engine is running.
Checking Disc BrakeINFOID:0000000003777008
ROTOR
Check the rotor condition for wear or damage. Refer to BR-7, "DISC
ROTOR : Inspection" , BR-9, "DISC ROTOR : Inspection" .
CALIPER
Check the caliper for any l eaks, repair as necessary.
Wheel nut tightening
torque
: 133 N·m (14 kg-m, 98 ft-lb)
LFIA0225E
SBR389C
SMA260A
SMA922A
Revision: December 20092009 QX56

CHASSIS AND BODY MAINTENANCEMA-31
< ON-VEHICLE MAINTENANCE >
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PA D
Check the pads for wear or damage. Refer to
BR-7, "BRAKE PAD :
Inspection" , BR-9, "BRAKE PAD : Inspection" .
Checking Steering Ge ar and LinkageINFOID:0000000003777009
STEERING GEAR
• Check the steering gear housing for looseness, damage and oil
leakage as shown.
• Check the steering column connections for looseness.
STEERING LINKAGE
• Check the ball joint, dust cover and other component parts for looseness, wear, damage, and grease leak-
age.
Checking Power Steering Fluid and LineINFOID:0000000003777010
CHECKING FLUID LEVEL
• Check the power steering fluid level with the engine off.
• Check fluid level on reservoir. Use “HOT” range at fluid tempera- tures of 50 ° to 80° C (122° to 176° F). Use “COLD” range at fluid
temperatures of 0 ° to 30° C (32° to 86° F).
CAUTION:
• Do not overfill.
• Refer to MA-12, "
Fluids and Lubricants" .
CHECKING LINES
• Check lines for improper attachment, leaks, cracks, damage, loose
connections, chafing, and deterioration.
LMA051
SGIA0506E
LGIA0021E
SGIA0506E
Revision: December 20092009 QX56

MWI-2
INFORMATION DISPLAY .........................................19
INFORMATION DISPLAY : System Diagram .........20
INFORMATION DISPLAY : System Description ....20
INFORMATION DISPLAY : Component Parts Lo-
cation ................................................................... ...
21
INFORMATION DISPLAY : Component Descrip-
tion ....................................................................... ...
21
COMPASS .........................................................22
Description (Early Production) ............................. ...22
DIAGNOSIS SYSTEM (METER) .......................24
Diagnosis Description .......................................... ...24
CONSULT-III Function (METER/M&A) ................ ...25
COMPONENT DIAGNOSIS ........................28
DTC U1000 CAN COMMUNICATION ............ ...28
DTC Logic ............................................................ ...28
Diagnosis Procedure .............................................28
DTC B2205 VEHICLE SPEED CIRCUIT ...........29
Description ........................................................... ...29
DTC Logic ...............................................................29
Diagnosis Procedure .............................................29
POWER SUPPLY AND GROUND CIRCUIT .....30
COMBINATION METER ........................................ ...30
COMBINATION METER : Diagnosis Procedure ....30
BCM (BODY CONTROL MODULE) ...................... ...30
BCM (BODY CONTROL MODULE) : Diagnosis
Procedure ...............................................................
31
IPDM E/R (INTELLIGENT POWER DISTRIBU-
TION MODULE ENGINE ROOM) .......................... ...
31
IPDM E/R (INTELLIGENT POWER DISTRIBU-
TION MODULE ENGINE ROOM) : Diagnosis Pro-
cedure .....................................................................
31
FUEL LEVEL SENSOR SIGNAL CIRCUIT .......33
Description ........................................................... ...33
Component Function Check ...................................33
Diagnosis Procedure .............................................33
Component Inspection ............................................34
OIL PRESSURE SWITCH SIGNAL CIRCUIT ...35
Description ..............................................................35
Component Function Check ...................................35
Diagnosis Procedure ..............................................35
Component Inspection ............................................35
PARKING BRAKE SWITCH SIGNAL CIR-
CUIT ...................................................................
36
Description ........................................................... ...36
Component Function Check ...................................36
Diagnosis Procedure ..............................................36
Component Inspection ............................................36
WASHER LEVEL SWITCH SIGNAL CIRCUIT ...37
Description ........................................................... ...37
Diagnosis Procedure ............................................ ...37
Component Inspection ............................................37
COMPASS .........................................................38
Wiring Diagram (Early Production) ...................... ...38
CLOCK ..............................................................40
Wiring Diagram .................................................... ...40
ECU DIAGNOSIS .......................................42
COMBINATION METER ................................. ...42
Reference Value .................................................. ...42
Wiring Diagram .......................................................44
Fail Safe ..................................................................61
DTC Index ...............................................................62
BCM (BODY CONTROL MODULE) ..................64
Reference Value .................................................. ...64
Terminal Layout ......................................................66
Physical Values .......................................................66
Wiring Diagram .......................................................72
Fail Safe .................................................................76
DTC Inspection Priority Chart ...............................77
DTC Index ..............................................................77
IPDM E/R (INTELLIGENT POWER DISTRI-
BUTION MODULE ENGINE ROOM) .................
79
Reference Value .................................................. ...79
Terminal Layout ......................................................81
Physical Values .......................................................81
Wiring Diagram .......................................................86
Fail Safe .................................................................89
DTC Index ..............................................................91
SYMPTOM DIAGNOSIS ............................92
THE FUEL GAUGE POINTER DOES NOT
MOVE .............................................................. ...
92
Description ........................................................... ...92
Diagnosis Procedure ...............................................92
THE FUEL GAUGE POINTER DOES NOT
MOVE TO "F" WHEN REFUELING ..................
93
Description ........................................................... ...93
Diagnosis Procedure ...............................................93
THE OIL PRESSURE WARNING LAMP
DOES NOT TURN ON .................................... ...
94
Description ........................................................... ...94
Diagnosis Procedure ...............................................94
THE OIL PRESSURE WARNING LAMP
DOES NOT TURN OFF .................................. ...
95
Description ........................................................... ...95
Diagnosis Procedure ...............................................95
THE PARKING BRAKE RELEASE WARNING
CONTINUES DISPLAYING, OR DOES NOT
DISPLAY ............................................................
96
Description ........................................................... ...96
Revision: December 20092009 QX56

MWI
METER SYSTEMMWI-5
< FUNCTION DIAGNOSIS >
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FUNCTION DIAGNOSIS
METER SYSTEM
METER SYSTEM
METER SYSTEM : System DiagramINFOID:0000000003776580
METER SYSTEM : System DescriptionINFOID:0000000003776581
COMBINATION METER
• Speedometer, odo/trip meter, tachometer, fuel gauge, engine coolant temperature gauge, engine oil pres-
sure gauge, voltage gauge and information display are controlled by the unified meter control unit, which is
built into the combination meter.
• Warning and indicator lamps are controlled by the unified meter control unit and by components connected directly to the combination meter.
• Digital meter is adopted for odo/trip meter.* *The record of the odometer is kept even if the battery cable is disconnected. The record of the trip meter is
erased when the battery cable is disconnected.
• Odo/trip meter segments can be checked in diagnosis mode.
• Meter/gauge can be checked in diagnosis mode.
AWNIA0274GB
Revision: December 20092009 QX56

MWI-26
< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (METER)
X: Applicable
Display item [Unit]MAIN
SIGNALS SELECTION
FROM MENU Description
SPEED METER [km/h] or [mph] X X Displays the value of vehicle speed signal.
SPEED OUTPUT [km/h] or [mph] X XDisplays the value of vehicle speed signal, which is transmitted to
each unit with
CAN communication.
TACHO METER [rpm] XX Displays the value of engine speed signal, which is input from ECM.
FUEL METER [lit.] XXDisplays the value, which processes a resistance signal from fuel
gauge.
W TEMP METER [ °C] or [° F] X XDisplays the value of engine coolant temperature signal, which is in-
put from ECM.
ABS W/L [ON/OFF] X Displays [ON/OFF] condition of ABS warning lamp.
VDC/TCS IND [ON/OFF] X Displays [ON/OFF] condition of VDC OFF indicator lamp.
SLIP IND [ON/OFF] X Displays [ON/OFF] condition of SLIP indicator lamp.
BRAKE W/L [ON/OFF] X Displays [ON/OFF] condition of brake warning lamp.*
DOOR W/L [ON/OFF] X Displays [ON/OFF] condition of door warning lamp.
TRUNK W/L [ON/OFF] X Displays [ON/OFF] condition of glass hatch warning lamp.
HI-BEAM IND [ON/OFF] X Displays [ON/OFF] condition of high beam indicator.
TURN IND [ON/OFF] X Displays [ON/OFF] conditio n of turn indicator.
OIL W/L [ON/OFF] X Displays [ON/OFF] condition of oil pressure warning lamp.
C-ENG W/L [ON/OFF] X Displays [ON/OFF] condition of malfunction indicator lamp.
CRUISE IND [ON/OFF] X Displays [ON/OFF] condition of CRUISE indicator.
SET IND [ON/OFF] X Displays [ON/OFF] condition of SET indicator.
AT CHECK W/L [ON/OFF] X Displays [ON/OFF] condition of AT CHECK warning lamp.
FUEL W/L [ON/OFF] XX Displays [ON/OFF] condition of low-fuel warning lamp.
AIR PRES W/L [ON/OFF] X Displays [ON/OFF] condition of tire pressure warning lamp.
KEY G/Y W/L [ON/OFF] X Displays [ON/OFF] condition of key green warning lamp.
KEY R W/L [ON/OFF] X Displays [ON/OFF] condition of key red warning lamp.
KEY KNOB W/L [ON/OFF] X Displays [ON/OFF] condition of key knob warning lamp.
M RANGE SW [ON/OFF] XX Displays [ON/OFF] condition of manual mode range switch.
NM RANGE SW [ON/OFF] XXDisplays [ON/OFF] condition of except for manual mode range
switch.
AT SFT UP SW [ON/OFF] XX Displays [ON/OFF] condition of A/T shift-up switch.
AT SFT DWN SW [ON/OFF] XX Displays [ON/OF F] condition of A/T shift-down switch.
DISTANCE [km] or [mile] XXDisplays the value, which is calculated by vehicle speed signal, fuel
gauge and fuel consumption from ECM.
BUZZER [ON/OFF] XX Displays [ON/ OFF] condition of buzzer.
BRAKE SW [ON/OFF] X Indicates [ON/OFF] condition of parking brake switch.
AT-M GEAR [1, 2, 3, 4, 5] XX Indicates [1, 2, 3, 4, 5] condition of A/T manual mode gear position.
P RANGE IND [ON/OFF] XX Indicates [ON/OFF] condition of A/T shift P range indicator.
R RANGE IND [ON/OFF] XX Indicates [ON/OFF] condition of A/T shift R range indicator.
N RANGE IND [ON/OFF] XX Indicates [ON/OFF] condition of A/T shift N range indicator.
D RANGE IND [ON/OFF] XX Indicates [ON/OFF] condition of A/T shift D range indicator.
4 RANGE IND [ON/OFF] XX Indicates [ON/OFF] condition of A/T shift 4 range indicator.
3 RANGE IND [ON/OFF] XX Indicates [ON/OFF] condition of A/T shift 3 range indicator.
2 RANGE IND [ON/OFF] XX Indicates [ON/OFF] condition of A/T shift 2 range indicator.
1 RANGE IND [ON/OFF] XX Indicates [ON/OFF] condition of A/T shift 1range indicator.
Revision: December 20092009 QX56

MWI
DTC B2205 VEHICLE SPEED CIRCUITMWI-29
< COMPONENT DIAGNOSIS >
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DTC B2205 VEHICLE SPEED CIRCUIT
DescriptionINFOID:0000000003776630
The ABS actuator and electric unit (control unit) provi des a vehicle speed signal to the combination meter via
CAN communication lines.
DTC LogicINFOID:0000000003776631
Diagnosis ProcedureINFOID:0000000003776632
Symptom: Displays “VEHICLE SPEED CIRC [B2205]” as a self-diagnosis result of combination meter.
1.CHECK COMBINATION METER INPUT SIGNAL
1. Start engine and select “M ETER/M&A” on CONSULT-III.
2. Using “SPEED METER” on “DATA MONITOR”, compare the value of DATA MONITOR with speedometer
pointer of combination meter. Speedometer and DATA MONITOR indications should be close.
Is the inspection result normal?
YES >> Perform ABS actuator and electric uni t (control unit) self-diagnosis. Refer to BRC-24, "CONSULT-
III Function (ABS)".
NO >> Replace combination meter. Refer to MWI-102, "
Removal and Installation".
DTC CONSULT-III display Detection condition
B2205 VEHICLE SPEED CIRC
[B2205]
Malfunction is detected when an erroneous speed signal is received for 2 seconds or more.
Revision: December 20092009 QX56