2010 INFINITI QX56 check engine

STR-10
< COMPONENT DIAGNOSIS >
B TERMINAL CIRCUIT
COMPONENT DIAGNOSIS
B TERMINAL CIRCUIT
DescriptionINFOID:0000000005149554
Terminal "2" (B) is constantly supplied with battery power.
Diagnosis ProcedureINFOID:0000000005149555
Regarding Wiring Diagram information, refer to STR-14, "Wiring Diagram".
CAUTION:
Perform diagnosis under the condi tion that the engine cannot start by the following procedure.
1. Remove fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is depleted.
1.CHECK TERMINAL 2 POWER SUPPLY VOLTAGE
1. Turn ignition switch OFF.
2. Make sure that starter motor connector F27 terminal 2 connection is clean and tight.
3. Check voltage between starter motor connector F27 terminal 2
and ground.
Is there battery voltage present?
YES >> GO TO 2
NO >> Check harness between battery and starter motor for open circuit.
2.CHECK BATTERY CABLE (VOLTAGE DROP TEST)
1. Shift the transmission into park or neutral.
2. Check voltage between battery positive terminal and starter motor connector F27 terminal 2 while cranking the engine.
Is the voltage drop less than 0.2V?
YES >> GO TO 3
NO >> Check harness between the battery and the starter motor for high resistance.
3.CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)
(+) (-)Condition Voltage
Connector Terminal
F27 2 Ground While cranking the
engine Battery voltage
AWBIA0122GB
(+)
(-)Condition Voltage
Connector Terminal
F27 2 Battery (+)
terminal While cranking the
engine Less than 0.2V
AWBIA0123GB
Revision: April 20092010 QX56

B TERMINAL CIRCUITSTR-11
< COMPONENT DIAGNOSIS >
C
DE
F
G H
I
J
K L
M A
STR
NP
O
Check voltage between starter motor case and battery negative ter-
minal while cranking the engine.
Is the voltage drop less than 0.2V?
YES >> Terminal 2 circuit is OK. Further inspection necessary.
Refer to STR-5, "
Work Flow".
NO >> Check the starter motor case to engine mounting for
high resistance.
(+) (-)Condition Voltage
Starter motor case Battery (-) terminal While cranking the
engine Less than 0.2V
AWBIA0124GB
Revision: April 20092010 QX56

STR-12
< COMPONENT DIAGNOSIS >
S CONNECTOR CIRCUIT
S CONNECTOR CIRCUIT
DescriptionINFOID:0000000005149556
Terminal "1" (S) is the power supply for the starter motor magnetic switch. Terminal 1 is supplied with power
when the ignition switch is turned to the START position while the selector lever is in the P or N position.
Diagnosis ProcedureINFOID:0000000005149557
Regarding Wiring Diagram information, refer to STR-14, "Wiring Diagram".
CAUTION:
Perform diagnosis under the condi tion that engine cannot start by the following procedure.
1. Remove fuel pump fuse.
2. Crank or start the engine (where possi ble) until the fuel pressure is released.
1.CHECK STARTER MOTOR MAGNETIC SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect starter motor connector F28.
3. Shift transmission into park or neutral.
4. Check voltage between starter motor harness connector F28 terminal 1 and ground with the ignition in START.
Is battery voltage present?
YES >> Magnetic switch circuit is OK. Further inspection necessary. Refer to STR-5, "Work Flow".
NO >> GO TO 2
2.CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Check the IPDM E/R harness connector E120 and st arter motor harness connector F28 for damage, bent
pins and loose connections.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair the terminal and connector.
3.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
1. Disconnect IPDM E/R connector E120 and starter motor con- nector F28.
2. Check continuity between starter motor harness connector F28
(A) terminal 1 and IPDM E/R harness connector E120 (B) termi-
nal 19.
3. Check continuity between starter motor harness connector F28 (A) terminal 1 and ground.
(+) (-)Condition Voltage
Connector Terminal
F28 1 Ground Ignition in START Battery voltage
AWBIA0125GB
AB Continuity
Connector Terminal Connector Terminal
F28 1E120 19 Yes
A —Contin u it y
Connector Terminal
F28 1Ground No
AWBIA0126GB
Revision: April 20092010 QX56

TM-3
CEF
G H
I
J
K L
M A
B
TM
N
O P
Diagnosis Procedure ...........................................
....
80
P1752 INPUT CLUTCH SOLENOID ..................82
Description .......................................................... ....82
CONSULT-III Reference Value in Data Monitor
Mode ................................................................... ....
82
On Board Diagnosis Logic ......................................82
Possible Cause .......................................................82
DTC Confirmation Procedure ..................................82
Diagnosis Procedure ...............................................82
P1757 FRONT BRAKE SOLENOID ...................84
Description .......................................................... ....84
CONSULT-III Reference Value in Data Monitor
Mode ................................................................... ....
84
On Board Diagnosis Logic ......................................84
Possible Cause .......................................................84
DTC Confirmation Procedure ..................................84
Diagnosis Procedure ...............................................84
P1762 DIRECT CLUTCH SOLENOID ................86
Description .......................................................... ....86
CONSULT-III Reference Value in Data Monitor
Mode ................................................................... ....
86
On Board Diagnosis Logic ......................................86
Possible Cause .......................................................86
DTC Confirmation Procedure ..................................86
Diagnosis Procedure ...............................................86
P1767 HIGH AND LOW REVERSE CLUTCH
SOLENOID .........................................................
88
Description .......................................................... ....88
CONSULT-III Reference Value in Data Monitor
Mode ................................................................... ....
88
On Board Diagnosis Logic ......................................88
Possible Cause .......................................................88
DTC Confirmation Procedure ..................................88
Diagnosis Procedure ...............................................88
P1772 LOW COAST BRAKE SOLENOID .........90
Description .......................................................... ....90
CONSULT-III Reference Value in Data Monitor
Mode ................................................................... ....
90
On Board Diagnosis Logic ......................................90
Possible Cause .......................................................90
DTC Confirmation Procedure ..................................90
Diagnosis Procedure ...............................................90
P1774 LOW COAST BRAKE SOLENOID .........92
Description .......................................................... ....92
CONSULT-III Reference Value in Data Monitor
Mode ................................................................... ....
92
On Board Diagnosis Logic ......................................92
Possible Cause .......................................................92
DTC Confirmation Procedure ..................................92
Diagnosis Procedure ...............................................93
MAIN POWER SUPPLY AND GROUND CIR-
CUIT ....................................................................
94
Diagnosis Procedure ........................................... ....94
CLOSED THROTTLE POSITION AND WIDE
OPEN THROTTLE POSITION CIRCUIT ...........
96
CONSULT-III Reference Value in Data Monitor
Mode .................................................................... ....
96
Diagnosis Procedure ...............................................96
BRAKE SIGNAL CIRCUIT ................................97
CONSULT-III Reference Va lue in Data Monitor
Mode .................................................................... ....
97
Diagnosis Procedure ...............................................97
TOW MODE SWITCH .......................................98
Description ...............................................................98
Diagnosis Procedure ...............................................98
A/T SHIFT LOCK SYSTEM ...............................99
Description ...............................................................99
Terminals And Reference Values ............................99
Wiring Diagram - A/T SH IFT LOCK SYSTEM - .....100
Component Inspection ......................................... ..103
ECU DIAGNOSIS .......................................106
TCM .................................................................106
Reference Value .................................................. ..106
Wiring Diagram — A/T CONTROL SYSTEM — .. ..108
Fail-Safe .............................................................. ..117
DTC Inspection Priority Chart ................................119
DTC No. Index .......................................................119
DTC Alphabetical Index .........................................120
SYMPTOM DIAGNOSIS ............................121
SYSTEM SYMPTOM .......................................121
Symptom Table ................................................... ..121
PRECAUTION ............................................143
PRECAUTIONS ...............................................143
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ..
143
Precaution for On Board Diagnosis (OBD) System
of A/T and Engine ................................................ ..
143
Precaution .............................................................143
Service Notice or Precaution .................................144
PREPARATION .........................................146
PREPARATION ...............................................146
Special Service Tool ............................................ ..146
Commercial Service Tool ......................................147
ON-VEHICLE MAINTENANCE ..................148
A/T FLUID .......................................................148
Checking the A/T Fluid (ATF) .............................. ..148
Changing the A/T Fluid (ATF) ................................150
A/T FLUID COOLER .......................................152
A/T Fluid Cooler Cleaning .....................................152
Inspection ..............................................................154
Revision: April 20092010 QX56

TM-4
STALL TEST ....................................................155
Inspection and Judgment .................................... ..155
LINE PRESSURE TEST ..................................157
Inspection and Judgment .................................... ..157
ROAD TEST .....................................................159
Description ........................................................... ..159
Check Before Engine Is Started ............................159
Check At Idle ....................................................... ..159
Cruise Test - Part 1 ...............................................160
Cruise Test - Part 2 ...............................................162
Cruise Test - Part 3 ...............................................162
Vehicle Speed When Shifting Gears .....................163
Vehicle Speed When Performing and Releasing
Complete Lock-up .................................................
163
A/T POSITION .................................................164
Adjustment of A/T Position .................................. ..164
Checking of A/T Position .......................................164
ON-VEHICLE REPAIR ...............................165
SHIFT CONTROL SYSTEM ........................... .165
A/T Shift Selector Removal and Installation ..........165
AIR BREATHER HOSE .................................. .166
Removal and Installation ..................................... ..166
OIL PAN ...........................................................170
Oil Pan ................................................................. ..170
CONTROL VALVE WITH TCM ........................172
Control Valve with TCM and A/T Fluid Tempera-
ture Sensor 2 and Plug ........................................ ..
172
REAR OIL SEAL ..............................................184
Rear Oil Seal ....................................................... ..184
FLUID COOLER SYSTEM ...............................185
Exploded View ..................................................... ..185
Removal and Installation .......................................185
REMOVAL AND INSTALLATION ..............186
TRANSMISSION ASSEMBLY ........................ .186
Removal and Installation (2WD) .......................... .186
Removal and Installation (4WD) ...........................188
DISASSEMBLY AND ASSEMBLY ...........192
OVERHAUL ......................................................192
Component .......................................................... .192
Oil Channel ...........................................................199
Location of Adjusting Shims, Needle Bearings,
Thrust Washers and Snap Rings ......................... .
201
DISASSEMBLY .............................................. ..204
Disassembly ......................................................... .204
REPAIR FOR COMPONENT PARTS ..............223
Oil Pump .............................................................. .223
Front Sun Gear, 3rd One-Way Clutch ...................225
Front Carrier, Input Clutch, Rear Internal Gear .....227
Mid Sun Gear, Rear Sun Gear, High and Low Re-
verse Clutch Hub ................................................. .
232
High and Low Reverse Clutch ..............................237
Direct Clutch .........................................................239
ASSEMBLY .................................................... ..242
Assembly (1) ........................................................ .242
Adjustment ............................................................255
Assembly (2) .........................................................257
SERVICE DATA AND SPECIFICATIONS
(SDS) ........ .................................................
265
SERVICE DATA AND SPECIFICATIONS
(SDS) .............................................................. ..
265
General Specification ........................................... .265
Vehicle Speed at Which Gear Shifting Occurs .....265
Vehicle Speed at Which Lock-up Occurs/Releas-
es ......................................................................... .
266
Stall Speed ............................................................266
Line Pressure ........................................................266
Input Speed Sensor ..............................................266
Output Speed Sensor ...........................................266
Reverse Brake ......................................................266
Total End Play .......................................................267
Torque Converter ..................................................267
Revision: April 20092010 QX56

DIAGNOSIS AND REPAIR WORKFLOWTM-5
< BASIC INSPECTION >
CEF
G H
I
J
K L
M A
B
TM
N
O P
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work FlowINFOID:0000000005148505
INTRODUCTION
The TCM receives a signal from the output speed sensor, accelera-
tor pedal position sensor or transmission range switch. Then pro-
vides shift control or lock-up control via A/T solenoid valves.
The TCM also communicates with the ECM by means of a signal
sent from sensing elements used wit h the OBD-related parts of the
A/T system for malfunction-diagnostic purposes. The TCM is capa-
ble of diagnosing malfunctioning parts while the ECM can store mal-
functions in its memory.
Input and output signals must always be correct and stable in the
operation of the A/T system. T he A/T system must be in good oper-
ating condition and be free of valve seizure, solenoid valve malfunc-
tion, etc.
It is much more difficult to diagnose an error that occurs intermit-
tently rather than continuously. Most intermittent errors are caused
by poor electric connections or impr oper wiring. In this case, careful
checking of suspected circuits may help prevent the replacement of
good parts.
A visual check only may not find t he cause of the errors. A road test
with CONSULT-III (or GST) or a circuit tester connected should be
performed. Follow the “DETAILED FLOW”.
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such errors, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A “Diagnostic work sheet” as shown on
the example (Refer to TM-6
) should be used.
Start your diagnosis by looking for “conventional” errors first. This will
help troubleshoot driveability errors on an electronically controlled
engine vehicle.
Also check related Service bulletins.
DETAILED FLOW
1.COLLECT THE INFORMATION FROM THE CUSTOMER
Get the detailed information from the customer about the symptom (the condition and the environment when
the incident/malfunction occurred) us ing diagnosis worksheet. Refer to TM-6, "
Diagnostic Work Sheet".
>> GO TO 2.
2.CHECK SYMPTOM 1
Check the following items based on the in formation obtained from the customer.
• Fail-safe. Refer to TM-117, "
Fail-Safe".
• A/T fluid inspection. Refer to TM-148, "
Checking the A/T Fluid (ATF)".
• Stall test. Refer to TM-155, "
Inspection and Judgment".
• Line pressure test. Refer to TM-157, "
Inspection and Judgment".
SAT631IB
SAT632I
SEF234G
Revision: April 20092010 QX56

TM-6
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
>> GO TO 3.
3.CHECK DTC
1. Check DTC.
2. Perform the following procedure if DTC is detected.
• Record DTC.
• Erase DTC. Refer to TM-30, "
OBD-II Diagnostic Trouble Code (DTC)".
Is any DTC detected?
YES >> GO TO 4.
NO >> GO TO 6.
4.PERFORM DIAGNOSTIC PROCEDURE
Perform “Diagnosis Procedure” for the displayed DTC.
>> GO TO 5.
5.PERFORM DTC CONFIRMATION PROCEDURE
Perform “DTC CONFIRMATION PROCEDURE”.
Is DTC detected?
YES >> GO TO 4.
NO >> GO TO 6.
6.CHECK SYMPTOM 2
Try to confirm the symptom described by the customer.
Is any malfunction present?
YES >> GO TO 7.
NO >> INSPECTION END
7.ROAD TEST
Perform “ROAD TEST”. Refer to TM-159, "
Description".
>> GO TO 8.
8.CHECK SYMPTOM 3
Try to confirm the symptom described by the customer.
Is any malfunction present?
YES >> GO TO 2.
NO >> INSPECTION END
Diagnostic Work SheetINFOID:0000000005148506
INFORMATION FROM CUSTOMER
KEY POINTS• WHAT ..... Vehicle and A/T model
• WHEN ..... Date, Frequencies
• WHERE ..... Road conditions
• HOW ..... Operating conditions, Symptoms
Customer name MR/MS Model and Year VIN
Trans. Model EngineMileage
Malfunction Date Manuf. DateIn Service Date
Frequency † Continuous † Intermittent ( times a day)
Revision: April 20092010 QX56

DIAGNOSIS AND REPAIR WORKFLOWTM-7
< BASIC INSPECTION >
CEF
G H
I
J
K L
M A
B
TM
N
O P
DIAGNOSTIC WORK SHEET
Symptoms † Vehicle does not move. ( † Any position † Particular position)
† No up-shift ( † 1st → 2nd † 2nd → 3rd † 3rd → 4th † 4th → 5th)
† No down-shift ( † 5th → 4th † 4th → 3rd † 3rd → 2nd † 2nd → 1st)
† Lock-up malfunction
† Shift point too high or too low.
† Shift shock or slip ( † N → D † N → R † Lock-up † Any drive position)
† Noise or vibration
† No kick down
† No pattern select
† Others
()
A/T CHECK indicator lamp † Continuously lit † Not lit
Malfunction indicator lamp (MIL) † Continuously lit † Not lit
1 †
Read the item on cautions concerning fail-safe and understand the customer's com-
plaint. TM-117
2†
A/T fluid inspection, stall test and line pressure test
† A/T fluid inspection
TM-148
† Leak (Repair leak location.)
† Sta te
† Amount
† Stall test
TM-155
† Torque converter one-way clutch
† Front brake
† High and low reverse clutch
† Low coast brake
† Forward brake
† Reverse brake
† Forward one-way clutch †
1st one-way
clutch
† 3rd one-way
clutch
† Engine
† Line pressure low
† Except for input
clutch and direct
clutch, clutches and
brakes OK
† Line pressure test - Suspected part: TM-157
3†
Perform self-diagnosis. — Check detected items to repair or replace malfunctioning
part. TM-32
4†
Perform road test.
5-1 † Check before engine is started TM-159
5-2† Check at idle TM-159
5-3Cruise test †
Part 1 TM-160† Part 2 TM-162
† Part 3 TM-162
† Check malfunction phenomena to repair or replace malfunctioning part after completing all road test.
Refer to TM-121, "
Symptom Table".
5 † Drive vehicle to check that the malfunction phenomenon has been resolved.
6 † Erase the results of the self-diagnosis from the TCM and the ECM. TM-30
Revision: April 20092010 QX56