2011 INFINITI QX56 transmission

TM-64
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
DIAGNOSIS SYSTEM (TCM)
TRG PRE 2346/B
(kPa, kg/cm2 or psi)—— Displays the target oil pressure value of 2346
brake solenoid valve calculated by the oil pres-
sure calculation process of shift change control.
SHIFT PATTERN — — Displays the gear change data using the shift
pattern control.
VEHICLE SPEED (km/h or mph) — — Displays the vehicle speed for control using the
control of TCM.
G SEN SLOPE (%) X — Displays the inclination angle calculated by the
G sensor signal received via CAN communica-
tion.
RANGE SW 4 (ON/OFF) X — Displays the operation status of transmission
range switch 4.
RANGE SW 3 (ON/OFF) X — Displays the operation status of transmission
range switch 3.
RANGE SW 2 (ON/OFF) X — Displays the operation status of transmission
range switch 2.
RANGE SW 1 (ON/OFF) X — Displays the operation status of transmission
range switch 1.
SFT DWN ST SW (ON/OFF) X —  Displays the operation status of paddle
shifter (down switch).
 Not mounted but displayed.
SFT UP ST SW (ON/OFF) X —  Displays the operation status of paddle
shifter (up switch).
 Not mounted but displayed.
DOWN SW LEVER (ON/OFF) X — Displays the operation status of selector lever
(down switch).
UP SW LEVER (ON/OFF) X — Displays the operation status of selector lever
(up switch).
NON M-MODE SW (ON/OFF) X — Displays whether the selector lever is in any po-
sition other than manual shift gate position.
MANU MODE SW (ON/OFF) X — Displays whether the selector lever is in the
manual shift gate position.
TOW MODE SW (ON/OFF) — — Displays the reception status of tow mode
switch signal received via CAN communication.
DS RANGE (ON/OFF) — —  Displays whether it is the DS mode.
 Not mounted but displayed.
1 POSITION SW (ON/OFF) X —  Displays the reception status of 1 position
switch signal received via CAN communica-
tion.
 Not mounted but displayed.
OD CONT SW (ON/OFF) X —  Displays the reception status of overdrive
control switch signal received via CAN com-
munication.
 Not mounted but displayed.
BRAKESW (ON/OFF) X — Displays the reception status of stop lamp
switch signal received via CAN communication.
POWERSHIFT SW (ON/OFF) X —  Displays the reception status of POWER
mode signal received via CAN communica-
tion.
 Not mounted but displayed.
Monitored item (Unit)
Monitor Item Selection
Remarks
ECU IN-
PUT SIG- NALS MAIN SIG-
NALS SELEC-
TION
FROM ITEM
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM (TCM)TM-65
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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ASCD-OD CUT (ON/OFF) X — Displays the reception status of ASCD OD can-
cel request signal received via CAN communi-
cation.
ASCD-CRUISE (ON/OFF) X — Displays the reception status of ASCD opera-
tion signal received via CAN communication.
ABS SIGNAL (ON/OFF) X — Displays the re
ception status of ABS operation
signal received via CAN communication.
TCS GR/P KEEP (ON/OFF) X — Displays the reception status of TCS gear keep
request signal received via CAN communica-
tion.
TCS SIGNAL 2 (ON/OFF) X — Displays whether the reception value of A/T
shift schedule change demand signal received
via CAN communication is “cold”.
TCS SIGNAL 1 (ON/OFF) X — Displays whether the reception value of A/T
shift schedule change demand signal received
via CAN communication is “warm”.
LOW/B PARTS (FAIL/NOTFAIL) — — Displays whether the identified malfunction
point judged by TCM is the related parts of low
brake.
HC/IC/FRB PARTS (FAIL/NOTFAIL) — — Displays whether the identified malfunction
point judged by TCM is the related parts of high
and low reversed clutch, input clutch or front
brake.
IC/FRB PARTS (FAIL/NOTFAIL) — — Displays whether the identified malfunction
point judged by TCM is the related parts of input
clutch or front brake.
HLR/C PARTS (FAIL/NOTFAIL) — — Displays whether the identified malfunction
point judged by TCM is the related parts of high
and low reversed clutch.
W/O THL POS (ON/OFF) X — Displays the kickdown condition signal status
received via CAN communication.
CLSD THL POS (ON/OFF) X — Displays the idling status signal status received
via CAN communication.
DRV CST JUDGE (DRIVE/COAST) — — Displays the judgment results of “driving” or
“coasting” judged by TCM.
SHIFT IND SIGNAL — — Displays the transmission value of shift position
signal transmitted via CAN communication.
STARTER RELAY (ON/OFF) — — Displays the command status from TCM to
starter relay.
F-SAFE IND/L (ON/OFF) — — Displays the transmission status of A/T CHECK
indicator lamp signal transmitted via CAN com-
munication.
ATF WARN LAMP (ON/OFF) — — Displays the transmission status of ATF tem-
perature signal transmitted via CAN communi-
cation.
MANU MODE IND (ON/OFF) — — Displays the transmission status of manual
mode signal transmitted via CAN communica-
tion.
ON OFF SOL MON (ON/OFF) — — Monitors the command value from TCM to the
anti-interlock solenoid, and displays the moni-
tor status.
Monitored item (Unit)
Monitor Item Selection
Remarks
ECU IN-
PUT SIG- NALS MAIN SIG-
NALS SELEC-
TION
FROM ITEM
Revision: 2010 May2011 QX56

TM-66
< SYSTEM DESCRIPTION >[7AT: RE7R01B]
DIAGNOSIS SYSTEM (TCM)
DTC & SRT CONFIRMATION
START RLY MON (ON/OFF) — — Monitors the command value from TCM to the
starter relay, and displays the monitor status.
ON OFF SOL (ON/OFF) — — Displays the command status from TCM to anti-
interlock solenoid.
SLCT LVR POSI — X Displays the shift positions recognized by TCM.
GEAR — X Displays the current transmission gear position
recognized by TCM.
NEXT GR POSI — — Displays the target gear position of gear
change that is calculated based on the vehicle
speed information and throttle information.
SHIFT MODE — — Displays the transmission driving mode recog-
nized by TCM.
D/C PARTS (FAIL/NOTFAIL) — — Displays whether the identified malfunction
point judged by TCM is the related parts of di-
rect clutch.
FR/B PARTS (FAIL/NOTFAIL) — — Displays whether the identified malfunction
point judged by TCM is the related parts of front
brake.
2346/B PARTS (FAIL/NOTFAIL) — — Displays whether the identified malfunction
point judged by TCM is the related parts of 2346
brake.
2346B/DC PARTS (FAIL/NOTFAIL) — — Displays whether the identified malfunction
point judged by TCM is the related parts of 2346
brake or direct clutch.
N IDLE STATUS (ON/OFF) — — Displays the control status of idle neutral con-
trol.
Monitored item (Unit)
Monitor Item Selection
Remarks
ECU IN-
PUT SIG- NALS MAIN SIG-
NALS SELEC-
TION
FROM ITEM
Revision: 2010 May2011 QX56

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]
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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]
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*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

DIAGNOSIS AND REPAIR WORK FLOWTM-89
< BASIC INSPECTION > [7AT: RE7R01B]
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6.IDENTIFY MALFUNCTIONING SYSTEM WI TH “DIAGNOSIS CHART BY SYMPTOM”
Use TM-165, "
Symptom Table" from the symptom inspection result in step 4. Then identify where to start per-
forming the diagnosis based on possible causes and symptoms.
>> GO TO 8.
7.REPAIR OR REPLACE THE MALFUNCTIONING PARTS
Repair or replace the detected malfunctioning parts.
Reconnect parts or connector after repairing or replacing, and then erase DTC if necessary.
>> GO TO 8.
8.FINAL CHECK
Perform “DTC CONFIRMATION PROCEDURE” again to make sure that the repair is correctly performed.
Check that malfunctions are not reproduced when obtai ning the malfunction information from the customer,
referring to the symptom inspection result in step 3 or 4.
Is DTC or malfunction symptom reproduced?
YES-1 >> DTC is reproduced: GO TO 5.
YES-2 >> Malfunction symptom is reproduced: GO TO 6.
NO >> Before delivering the vehicle to the customer, make sure that DTC is erased.
Question sheetINFOID:0000000006226790
DESCRIPTION
There are many operating conditions that may cause a malfunction
of the transmission parts. By understanding those conditions prop-
erly, a quick and exact diagnosis can be achieved.
In general, customers have their own criteria for a problem. There-
fore, it is important to understand the symptom and status well
enough by asking the customer about the concerns carefully. In
order to systemize all the inform ation for the diagnosis, prepare the
question sheet referring to the question points.
WORKSHEET SAMPLE
SEF907L
Question Sheet
Customer name MR/MS Engine # Manuf. Date Incident Date VIN
Model & Year In Service Date
Trans. Mileage km / Mile
Revision: 2010 May2011 QX56