2011 INFINITI QX56 ECU

TM-76
< ECU DIAGNOSIS INFORMATION >[7AT: RE7R01B]
TCM
Protection Control
INFOID:0000000006226784
The TCM becomes the protection control status temporar ily to protect the safety when the safety of TCM and
transmission is lost. It automatically returns to the normal status if the safety is secured.
The TCM has the following protection control.
REVERSE INHIBIT CONTROL
Intercepts the torque transmission and shift to the neutral stat us if the selector lever is shifted to “R” position
while the vehicle moves forward at the vehicle speed 10 km/h (7 MPH) or more.
P0730 —  Manual mode is prohibited
Neutral  The shifting between the gears
of 1 - 2 - 3 can be performed
 Manual mode is prohibited  Locks in 1GR
 The shifting between the gears
of 1 - 2 can be performed
 The shifting between the gears
of 1 - 2 - 3 can be performed
 Manual mode is prohibited
P0740 —  Lock-up is prohibited
 Slip lock-up is prohibited — Lock-up is prohibited
 Slip lock-up is prohibited
P0744 —  Lock-up is prohibited
 Slip lock-up is prohibited
— Lock-up is prohibited
 Slip lock-up is prohibited
P0750
P0775
P0795
P2713
P2722
P2731
P2807 —
 Locks in 2GR, 3GR, 4GR, 5GR,
6GR or 7GR
 Manual mode is prohibited — Locks in 1GR
 The shifting between the gears
of 1 - 2 - 3 can be performed
 The shifting between the gears of 3 - 4 - 5 can be performed
 The shifting between the gears
of 4 - 5 - 6 can be performed
 The shifting between the gears of 1 - 2 - 3 - 4 - 5 - 6 can be per-
formed
 Manual mode is prohibited
P0780 —  Manual mode is prohibited
Neutral — The shifting between the gears
of 1 - 2 - 3 can be performed
 Manual mode is prohibited
P1705 —  Downshift when accelerator ped-
al is depressed is prohibited
 Upshift when accelerator pedal
is released is prohibited
 Manual mode is prohibited  Downshift when accelerator ped-
al is depressed is prohibited
 Upshift when accelerator pedal
is released is prohibited
 Manual mode is prohibited  Downshift when accelerator ped-
al is depressed is prohibited
 Upshift when accelerator pedal
is released is prohibited
 Manual mode is prohibited
P1730 — Neutral
 Manual mode is prohibited  The shifting between the gears
of 1 - 2 - 3 can be performed
 Manual mode is prohibited  Locks in 1GR
 The shifting between the gears
of 2 - 3 - 4 can be performed
 The shifting between the gears of 3 - 4 can be performed
 The shifting between the gears of 4 - 5 - 6 can be performed
 Manual mode is prohibited
P1815 — Manual mode is prohibited — Manual mode is prohibited
U0300
U1000 Between
the gears of
1 - 2 - 3  The shifting between the gears
of 1 - 2 - 3 can be performed
 Manual mode is prohibited —
 The shifting between the gears
of 1 - 2 - 3 can be performed
 Line pressure is set to the maxi- mum hydraulic pressure
 Manual mode is prohibited
Between
the gears of 4 - 5 - 6 - 7  Fix the gear at driving
 Manual mode is prohibited
—
P0720 and
P1721 — Locks in 5GR — Locks in 5GR
DTC
Vehicle
condition Vehicle behavior for 1st fail-safe Vehicle behavior for 2nd fail-safe Vehicle behavior for final fail-safe
Revision: 2010 May2011 QX56

TCM
TM-77
< ECU DIAGNOSIS INFORMATION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
1ST ENGINE BRAKE PROTECTION CONTROL
Controls the engine brake so as not to make effective by turning the front brake solenoid output to OFF when
each solenoid becomes the electricity pattern of 1st engine brake during driving at the vehicle speed 25 km/h
or more in any positions other than “R” position and 1GR.
TCM HIGH TEMPERATURE PROTECTION CONTROL
Limit the accelerator opening and forcibly control the vehi cle to the low torque driving when the electronic sub-
strate in TCM reaches the high temperature.
DTC Inspection Priority ChartINFOID:0000000006226785
If some DTCs are displayed at the same time, perfo rm inspections one by one based on the priority as per the
following list.
Malfunction detection condition Vehicle speed: 10 km/h (7 MPH) or more
Control at malfunction Neutral
Normal return condition  Vehicle speed: 8 km/h (5 MPH) or less
and
 Engine speed: 2,200 rpm or less
Vehicle behavior  The torque transmission cannot be performed
 There is a shock just before a vehicle stop
Malfunction detection condition Select lever and gear: Any position other than “R” position and 1GR
and
 Vehicle speed: More than 25 km/h (16 MPH)
Control at malfunction Front brake solenoid output signal; OFF
Normal return condition Other than detection condition of malfunction
Vehicle behavior Does not exist
Malfunction detection condition TCM electronic substrate temperature
145
°C (293 °F) and 120 seconds
or
150 °C (302 °F)
Control at malfunction Accelerator opening: 0.5/8 or less
Normal return condition  TCM electronic substrate temperature: Less than 140
°C (284 °F)
and
 Vehicle speed: 5 km/h (3 MPH) or less
Vehicle behavior Accelerator opening: output torque of approximately 0.5/8
Priority Detected items (DTC) Reference 1 U1000 CAN COMM CIRCUIT TM-103, "
DTC Logic"
Revision: 2010 May2011 QX56

TM-78
< ECU DIAGNOSIS INFORMATION >[7AT: RE7R01B]
TCM
DTC Index
INFOID:0000000006226786
NOTE:
 If some DTCs are displayed at the same time, per form inspections one by one based on the priority as per
the following list. Refer to TM-77, "
DTC Inspection Priority Chart".
 The IGN counter is indicated in Freeze frame data (FFD). Refer to TM-61, "
CONSULT-III Function (TRANS-
MISSION)".
2P0615 STARTER RELAY
TM-104, "
DTC Logic"
P0705 T/M RANGE SWITCH ATM-106, "DTC Logic"
P0710 FLUID TEMP SENSOR ATM-107, "DTC Logic"
P0717 INPUT SPEED SENSOR ATM-109, "DTC Logic"
P0720 OUTPUT SPEED SENSOR TM-110, "DTC Logic"
P0740 TORQUE CONVERTERTM-128, "DTC Logic"
P0745 PC SOLENOID ATM-131, "DTC Logic"
P0750 SHIFT SOLENOID ATM-132, "DTC Logic"
P0775 PC SOLENOID BTM-133, "DTC Logic"
P0795 PC SOLENOID CTM-136, "DTC Logic"
P2713 PC SOLENOID DTM-147, "DTC Logic"
P2722 PC SOLENOID ETM-148, "DTC Logic"
P2731 PC SOLENOID FTM-149, "DTC Logic"
P2807 PC SOLENOID GTM-150, "DTC Logic"
3P0729 6GR INCORRECT RATIO
TM-114, "
DTC Logic"
P0730 INCORRECT GR RATIOTM-116, "DTC Logic"
P0731 1GR INCORRECT RATIOTM-118, "DTC Logic"
P0732 2GR INCORRECT RATIOTM-120, "DTC Logic"
P0733 3GR INCORRECT RATIOTM-122, "DTC Logic"
P0734 4GR INCORRECT RATIOTM-124, "DTC Logic"
P0735 5GR INCORRECT RATIOTM-126, "DTC Logic"
P0744 TORQUE CONVERTERTM-129, "DTC Logic"
P0780 SHIFTTM-134, "DTC Logic"
P1730 INTERLOCKTM-140, "DTC Logic"
P1734 7GR INCORRECT RATIOTM-142, "DTC Logic"
4U0300 CAN COMM DATA
TM-102, "
DTC Logic"
P0725 ENGINE SPEED TM-112, "DTC Logic"
P1705 TP SENSORTM-137, "DTC Logic"
P1721 VEHICLE SPEED SIGNALTM-138, "DTC Logic"
P1815 M-MODE SWITCHTM-144, "DTC Logic"
Priority Detected items (DTC) Reference
DTC*1
Items
(CONSULT-III screen terms) Reference
MIL*2, “ENGINE” with
CONSULT-III or GST CONSULT-III only
“TRANSMISSION”
— P0615 STARTER RELAY TM-104
P0705 P0705 T/M RANGE SWITCH A TM-106
P0710 P0710 FLUID TEMP SENSOR ATM-107
P0717 P0717 INPUT SPEED SENSOR ATM-109
P0720 P0720 OUTPUT SPEED SENSOR TM-110
Revision: 2010 May2011 QX56

TCM
TM-79
< ECU DIAGNOSIS INFORMATION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
*1: These numbers are prescribed by SAE J2012.
*2: Refer to TM-60, "
Diagnosis Description".
— P0725 ENGINE SPEED
TM-112
P0729 P0729 6GR INCORRECT RATIO TM-114
P0730 P0730 INCORRECT GR RATIOTM-116
P0731 P0731 1GR INCORRECT RATIOTM-118
P0732 P0732 2GR INCORRECT RATIOTM-120
P0733 P0733 3GR INCORRECT RATIOTM-122
P0734 P0734 4GR INCORRECT RATIOTM-124
P0735 P0735 5GR INCORRECT RATIOTM-126
P0740 P0740 TORQUE CONVERTERTM-128
P0744 P0744 TORQUE CONVERTERTM-129
P0745 P0745 PC SOLENOID ATM-131
P0750 P0750 SHIFT SOLENOID ATM-132
P0775 P0775 PC SOLENOID BTM-133
P0780 P0780 SHIFTTM-134
P0795 P0795 PC SOLENOID CTM-136
— P1705 TP SENSORTM-137
— P1721 VEHICLE SPEED SIGNALTM-138
P1730 P1730 INTERLOCK TM-140
P1734 P1734 7GR INCORRECT RATIOTM-142
— P1815 M-MODE SWITCHTM-144
P2713 P2713 PC SOLENOID D TM-147
P2722 P2722 PC SOLENOID ETM-148
P2731 P2731 PC SOLENOID FTM-149
P2807 P2807 PC SOLENOID GTM-150
— U0300 CAN COMM DATATM-102
U1000 U1000 CAN COMM CIRCUIT TM-103
DTC*1
Items
(CONSULT-III screen terms) Reference
MIL*2, “ENGINE” with
CONSULT-III or GST CONSULT-III only
“TRANSMISSION”
Revision: 2010 May2011 QX56

TM-100
< BASIC INSPECTION >[7AT: RE7R01B]
STALL TEST
STALL TEST
Inspection and JudgmentINFOID:0000000006226793
INSPECTION
1. Inspect the amount of engine oil. Replenish the engine oil if necessary.
2. Drive for about 10 minutes to warm up the vehicle
so that the A/T fluid temperature is 50 to 80°C (122 to
176 °F). Inspect the amount of AT F. Replenish if necessary.
3. Securely engage the parking brake so that the tires do not turn.
4. Start the engine, apply foot brake, and place selector lever in “D” position.
5. Gradually press down the accelerator pedal while holding down the foot brake.
6. Quickly read off the stall speed, and quickly release the accelerator pedal. CAUTION:
Never hold down the accelerator pedal for more than 5 seconds during this test.
7. Shift the selector lever to “N” position.
8. Cool down the ATF. CAUTION:
Run the engine at idle for at least 1 minute.
9. Repeat steps 5 through 8 with selector lever in “R” position.
JUDGMENT OF STALL TEST
O: Stall speed within standard value position
H: Stall speed higher than standard value
L: Stall speed lower than standard value
Stall test standard value position
Stall speed : Refer to TM-297, "Stall Speed".
Selector lever position
Possible location of malfunction
“D” and “M” “R”
Stal l s pe ed HO
 Low brake
 1st one-way clutch
 2nd one-way clutch
OH  Reverse brake
 1st one-way clutch
 2nd one-way clutch
L L  Engine and torque converter one-way clutch
H H  Line pressure low
Does not shift-up “D” or “M” position 1 → 2 Slipping in 2GR, 3GR, 4GR or 6GR 2346 brake slippage
Does not shift-up “D” or “M” position 2 → 3 Slipping in 3GR, 4GR or 5GR Direct clutch slippage
Does not shift-up “D” or “M” position 3 → 4 Slipping in 4GR, 5GR, 6GR or 7GR High and low reverse clutch slippage
Does not shift-up “D” or “M” position 4 → 5 Slipping in 5GR, 6GR or 7GR Input clutch slippage
Does not shift-up “D” or “M” position 5 → 6 Slipping in 2GR, 3GR, 4GR or 6GR 2346 brake slippage
Does not shift-up “D” or “M” position 6 → 7 Slipping in 7GR Front brake slippage
Revision: 2010 May2011 QX56

U1000 CAN COMM CIRCUITTM-103
< DTC/CIRCUIT DIAGNOSIS > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000006226798
CAN (Controller Area Network) is a serial communication line for real-time application. It is an on-vehicle mul-
tiplex communication line with high data communica tion speed and excellent malfunction detection ability.
Many electronic control units are equipped onto a vehicl e, and each control unit shares information and links
with other control units during operation (not independently ). In CAN communication, control units are con-
nected with 2 communication lines (CAN-H line, CAN-L li ne) allowing a high rate of information transmission
with less wiring. Each control unit transmits/recei ves data but selectively reads required data only.
DTC LogicINFOID:0000000006226799
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” is previously c onducted, always turn ignition switch OFF and wait at
least 10 seconds before performing the next test.
>> GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Start the engine.
2. Run engine for at least 2 cons ecutive seconds at idle speed.
3. Perform “Self Diagnostic Resu lts” in “TRANSMISSION”.
With GST
Follow the procedure “With CONSULT-III”
Is
“U1000” detected?
YES >> Go to TM-103, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006226800
Go to LAN-18, "Trouble Diagnosis Flow Chart".
DTC Trouble diagnosis name DTC is detected if... Possible cause
U1000 CAN Communication Line TCM is not transmitting or re-
ceiving CAN communication
signal for 2 seconds or more. Harness or connectors
(CAN communication line is
open or shorted.)
TCM
Revision: 2010 May2011 QX56

CONTROL VALVE & TCMTM-185
< REMOVAL AND INSTALLATION > [7AT: RE7R01B]
C
EF
G H
I
J
K L
M A
B
TM
N
O P
CAUTION:
 Make sure that turbine revolution sensor securely installs input speed sensor holes (A).
 Hang down output speed senso r harness toward outside so
as not to disturb installation of the control valve & TCM.
 Adjust A/T assembly harness connector of the control valve
& TCM to terminal hole of transmission case.
 Assemble it so that manual valve (1) cutout is engaged with manual plate (2) projection.
- Install bolts and clip (1) to the control valve & TCM. Tighten bolt (E) to the specified torque before tightening the other than bolts.
*: Reamer bolt
 Refer to the following when installing oil pan to transmission case.CAUTION:
 Clean foreign materials (gear wear particles) that adhere on the inside of the oil pan and on the
magnet, and then assembly.
 Completely remove all moisture, oil and old gasket, etc. from oil pan gasket mounting surface of
transmission case and oil pan.
 Never reuse oil pan gasket and oil pan mounting bolts.
 Install oil pan gasket in the di rection to align hole position.
- Tighten the oil pan mounting bolts to the specified torque in the numerical order as shown in the figure after temporarily tightening
them.
JPDIA1106ZZ
JPDIA0012ZZ
: Vehicle front
Bolt symbol Length mm (in) Number of bolts A 43 (1.69) 3
B 40 (1.57) 2
C 54 (2.13) 6
D 50 (1.97) 2
E* 50 (1.97) 1
: Vehicle front
JPDIA1105ZZ
JSDIA1592GB
Revision: 2010 May2011 QX56

TM-206
< UNIT REMOVAL AND INSTALLATION >[7AT: RE7R01B]
TRANSMISSION ASSEMBLY
8. Remove exhaust front tube (RH and LH) and main muffler. Refer to
EX-5, "Exploded View".
9. Separate propeller shaft assembly. Refer to DLN-144, "
Removal and Installation".
NOTE:
Cap or plug opening to prevent fluid from spilling.
10. Remove front under cover with a power tool. Refer to EXT-25, "
Removal and Installation".
11. Remove protector A and B. Refer to SCS-32, "
FRONT TUBE ASSEMBLY : Exploded View".
12. Remove front suspension rear cross member.
13. Remove crankshaft position sensor (POS) from A/T assembly. Refer to EM-106, "
Exploded View".
CAUTION:
 Never subject it to impact by dropping or hitting it.
 Never disassemble.
 Never allow metal filings, etc. to ge t on the sensor's front edge magnetic area.
 Never place in an area affected by magnetism.
14. Remove rear plate cover. Refer to EM-54, "
Exploded View".
15. Turn crankshaft, and remove the four tight ening bolts for drive plate and torque converter.
CAUTION:
When turning the crankshaft, turn it clockw ise as viewed from the front of the engine.
16. Remove A/T fluid cooler tube A and D. Refer to TM-202, "
Exploded View".
NOTE:
Cap or plug openings to prevent fluid from spilling.
17. Remove bolts fixing A/T assembly to engine with a power tool.
18. Disconnect connector from A/T assembly.
19. Remove harness and brackets from A/T assembly.
20. Remove A/T assembly from the vehicle. CAUTION:
 Secure torque converter to prevent it from dropping.
 Secure A/T assembly to a transmission jack.
21. Remove air breather hose and bracket. Refer to TM-199, "
2WD
: Exploded View".
22. Remove manual lever from A/T assembly. Refer to TM-178,
"Exploded View".
INSTALLATION
Note the following, and Install in the reverse order of removal.
 Check fitting of dowel pin ( ).
ATA0025D
JSDIA1597ZZ
Revision: 2010 May2011 QX56