INFINITI QX56 2011 Factory Service Manual

DIAGNOSIS SYSTEM (TCM)TM-63
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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FR/B SOL MON (A) — — Monitors the command current from TCM to the
front brake solenoid, and displays the monitor
value.
HLR/C SOL MON (A) — — Monitors the command current from TCM to the
high and low reverse clutch solenoid, and dis-
plays the monitor value.
I/C SOL MON (A) — — Monitors the command current from TCM to the
input clutch solenoid, and displays the monitor
value.
D/C SOL MON (A) — — Monitors the command current from TCM to the
direct clutch solenoid, and displays the monitor
value.
2346/B SOL MON (A) — — Monitors the command current from TCM to the
2346 brake solenoid, and displays the monitor
value.
GEAR RATIO — X Displays the gear ratio calculated from input
speed and output speed.
ENGINE TORQUE (Nm) — — Displays the engine torque estimated value re-
ceived via CAN communication.
ENG TORQUE D (Nm) — — Displays the engine torque estimated value re-
flected the requested torque of each control unit
received via CAN communication.
INPUT TRQ S (Nm) — — Displays the input torque using for the oil pres-
sure calculation process of shift change control.
INPUT TRQ L/P (Nm) — — Displays the input torque using for the oil pres-
sure calculation process of line pressure con-
trol.
TRGT PRES L/P (kPa, kg/cm
2 or psi)—— Displays the target oil pressure value of torque
converter clutch solenoid valve calculated by
the oil pressure calculation process of lock-up
control.
TRGT PRES TCC (kPa, kg/cm
2 or psi)—— Displays the target oil pressure value of torque
converter clutch solenoid valve calculated by
the oil pressure calculation process of shift
change control.
TRGT PRES L/B (kPa, kg/cm
2 or psi)—— Displays the target oil pressure value of low
brake solenoid valve calculated by the oil pres-
sure calculation process of shift change control.
TRGT PRE FR/B (kPa, kg/cm
2 or psi)—— Displays the target oil pressure value of front
brake solenoid valve calculated by the oil pres-
sure calculation process of shift change control.
TRG PRE HLR/C (kPa, kg/cm
2 or psi)—— Displays the target oil pressure value of high
and low reverse clutch solenoid valve calculat-
ed by the oil pressure calculation process of
shift change control.
TRGT PRES I/C (kPa, kg/cm
2 or psi)—— Displays the target oil pressure value of input
clutch solenoid valve calculated by the oil pres-
sure calculation process of shift change control.
TRGT PRES D/C (kPa, kg/cm
2 or psi)—— Displays the target oil pressure value of direct
clutch solenoid valve calculated by the oil pres-
sure calculation process of shift change control.
Monitored item (Unit)
Monitor Item Selection
Remarks
ECU IN-
PUT SIG- NALS MAIN SIG-
NALS SELEC-
TION
FROM ITEM
Revision: 2010 May2011 QX56

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

DIAGNOSIS SYSTEM (TCM)TM-67
< SYSTEM DESCRIPTION > [7AT: RE7R01B]
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Item name Description Check item
1ST GR FNCTN P0731 Following items for “1GR incorrect ratio” can be confirmed.
 Self-diagnosis status (whether the diagnosis is being performed or not)
 Self-diagnostic results (OK or NG)
 Input clutch solenoid
valve
 Front brake solenoid
valve
 Direct clutch solenoid valve
 High and low reverse clutch solenoid valve
 Low brake solenoid
valve
 2346 brake solenoid valve
 Anti-interlock sole- noid valve
 Each clutch and brake
 Output speed sensor
 Input speed sensor 1, 2
 Hydraulic control cir- cuit
2ND GR FNCTN P0732
Following items for “2GR incorrect ratio” can be confirmed.
 Self-diagnosis status (whether the diagnosis is being performed or not)
 Self-diagnostic results (OK or NG)
3RD GR FNCTN P0733 Following items for “3GR incorrect ratio” can be confirmed.
 Self-diagnosis status (whether the diagnosis is being performed or not)
 Self-diagnostic results (OK or NG)
4TH GR FNCTN P0734 Following items for “4GR incorrect ratio” can be confirmed.
 Self-diagnosis status (whether the diagnosis is being performed or not)
 Self-diagnostic results (OK or NG)
5TH GR FNCTN P0735 Following items for “5GR incorrect ratio” can be confirmed.
 Self-diagnosis status (whether the diagnosis is being performed or not)
 Self-diagnostic results (OK or NG)
6TH GR FNCTN P0729 Following items for “6GR incorrect ratio” can be confirmed.
 Self-diagnosis status (whether the diagnosis is being performed or not)
 Self-diagnostic results (OK or NG)
7TH GR FNCTN P1734 Following items for “7GR incorrect ratio” can be confirmed.
 Self-diagnosis status (whether the diagnosis is being performed or not)
 Self-diagnostic results (OK or NG)
TCC SOL FUNCTN CHECK Following items for “TCC solenoid function” can be confirmed.
 Self-diagnosis status (whether the diagnosis is being performed or not)
 Self-diagnostic results (OK or NG)  Harness or connec-
tors
 Torque converter
clutch solenoid valve
 Torque converter
 Input speed sensor 1, 2
 Hydraulic control cir- cuit
Revision: 2010 May2011 QX56

TM-68
< ECU DIAGNOSIS INFORMATION >[7AT: RE7R01B]
TCM
ECU DIAGNOSIS INFORMATION
TCM
Reference ValueINFOID:0000000006226782
VALUES ON DIAGNOSIS TOOL
NOTE:
1. The CONSULT-III electrically displays shift timi
ng and lock-up timing (that is, operation timing of each
solenoid).
Check for time difference between actual shift timi ng and the CONSULT-III display. If the difference is
noticeable, mechanical parts (except solenoids, sens ors, etc.) may be malfunctioning. Check mechanical
parts in accordance with the specified diagnostic procedures.
2. Shift schedule (that implies gear position) on CONSULT-III may slightly differ from that is described in Ser-
vice Manual. This occurs because of the reasons as per the following:
- Actual shift schedule has more or less tolerance or allowance
- Shift schedule in Service Manual refers to the point where shifting starts
- Gear position on CONSULT-III indicates the point where shifting completes
3. Display of solenoid valves on CONSULT-III changes at t he start of shifting, while gear position is displayed
upon completion of shifting (which is computed by TCM).
CONSULT-III MONITOR ITEM
Item name Condition Value / Status (Approx.)
VHCL/S SE-A/T During driving Approximately equals the speed-
ometer reading.
ESTM VSP SIG During driving Approximately equals the speed-
ometer reading.
OUTPUT REV During driving (lock-up ON) Tachometer / Gear ratio
INPUT SPEED During driving (lock-up ON) Approximately equals the engine
speed.
F SUN GR REV During driving Revolution of front sun gear is indi-
cated.
F CARR GR REV During driving Revolution of front carrier is indi-
cated.
ENGINE SPEED Eng ine running Closely equals the tachometer
reading.
TC SLIP SPEED During driving Engine speed − Input speed
ACCELE POSI Accelerator pedal is released 0.0/8
Accelerator pedal is fully depressed 8.0/8
THROTTLE POSI Accelerator pedal is released 0.0/8
Accelerator pedal is fully depressed 8.0/8
ATF TEMP 1 Ignition switch ON Temperature of ATF in the oil pan is
indicated.
ATF TEMP 2 Ignition switch ON Temperature of ATF at the exit of
torque converter.
AT F T E M P S E 1 0 °C (32 ° F) – 20 °C (68 °F) – 80 °C (176 °F) 3.3 – 2.7 – 0.9 V
BATTERY VOLT Ignition switch ON Battery voltage (11 V – 14 V)
LINE PRES SOL During driving 0.2 – 0.6 A
TCC SOLENOID Slip lock-up is active 0.2 – 0.8 A
Lock-up is active 0.8 A
Other than the above 0 A
L/B SOLENOID Low brake is engaged 0.6 – 0.8 A
Low brake is disengaged 0 – 0.05 A
Revision: 2010 May2011 QX56

TCM
TM-69
< ECU DIAGNOSIS INFORMATION > [7AT: RE7R01B]
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FR/B SOLENOID Front brake is engaged 0.6 – 0.8 A
Front brake is disengaged 0 – 0.05 A
HLR/C SOL High and low reverse clutch is disengaged 0.6 – 0.8 A
High and low reverse clutch is engaged 0 – 0.05 A
I/C SOLENOID Input clutch is disengaged 0.6 – 0.8 A
Input clutch is engaged 0 – 0.05 A
D/C SOLENOID Direct clutch is disengaged 0.6 – 0.8 A
Direct clutch is engaged 0 – 0.05 A
2346/B SOL 2346 brake is engaged 0.6 – 0.8 A
2346 brake is disengaged 0 – 0.05 A
L/P SOL MON During driving 0.2 – 0.6 A
TCC SOL MON Slip lock-up is active 0.2 – 0.8 A
Lock-up is active 0.8 A
Other than the above 0 A
L/B SOL MON Low brake is engaged 0.6 – 0.8 A
Low brake is disengaged 0 – 0.05 A
FR/B SOL MON Front brake is engaged 0.6 – 0.8 A
Front brake is disengaged 0 – 0.05 A
HLR/C SOL MON High and low reverse clutch is disengaged 0.6 – 0.8 A
High and low reverse clutch is engaged 0 – 0.05 A
I/C SOL MON Input clutch is disengaged 0.6 – 0.8 A
Input clutch is engaged 0 – 0.05 A
D/C SOL MON Direct clutch is disengaged 0.6 – 0.8 A
Direct clutch is engaged 0 – 0.05 A
2346/B SOL MON 2346 brake is engaged 0.6 – 0.8 A
2346 brake is disengaged 0 – 0.05 A
GEAR RATIO Driving with 1GR 4.887
Driving with 2GR 3.170
Driving with 3GR 2.027
Driving with 4GR 1.412
Driving with 5GR 1.000
Driving with 6GR 0.864
Driving with 7GR 0.775
ENGINE TORQUE During driving Changes the value according to
the acceleration or deceleration.
ENG TORQUE D During driving Changes the value according to
the acceleration or deceleration.
INPUT TRQ S During driving Changes the value according to
the acceleration or deceleration.
INPUT TRQ L/P During driving Changes the value according to
the acceleration or deceleration.
TRGT PRES L/P Selector lever in “P” an
d “N” positions 490 kPa
Other than the above 490 – 1370 kPa
TRGT PRES TCC Slip lock-up is active 0 – 600 kPa
Lock-up is active 600 kPa
Other than the above 0 kPa
Item name Condition Value / Status (Approx.)
Revision: 2010 May2011 QX56

TM-70
< ECU DIAGNOSIS INFORMATION >[7AT: RE7R01B]
TCM
TRGT PRES L/BLow brake is engaged 1370 kPa
Low brake is disengaged 0 kPa
TRGT PRES FR/B Front brake is engaged 1370 kPa
Front brake is disengaged 0 kPa
TRG PRE HLR/C High and low reverse clutch is disengaged 1370 kPa
High and low reverse clutch is engaged 0 kPa
TRGT PRES I/C Input clutch is disengaged 1370 kPa
Input clutch is engaged 0 kPa
TRGT PRES D/C Direct clutch is disengaged 1370 kPa
Direct clutch is engaged 0 kPa
TRG PRE 2346/B 2346 brake is engaged 1370 kPa
2346 brake is disengaged 0 kPa
SHIFT PATTERN During normal driving (without shift changes) FF
VEHICLE SPEED During driving Approximately equals the speed-
ometer reading.
G SEN SLOPE Level road 0%
Uphill slope Positive value (maximum 40.45%)
Downhill slope
Negative value (minimum
−
40.45%)
RANGE SW 4 Selector lever in “P
” and “N” positions OFF
Other than the above ON
RANGE SW 3 Selector lever in “P”,
“R” and “N” positions OFF
Other than the above ON
RANGE SW 2 Selector lever in “P
” and “R” positions OFF
Other than the above ON
RANGE SW 1 Selector lever in “P” position OFF
Other than the above ON
SFT DWN ST SW* Paddle shifter (shift-down) is pulled ON
Other than the above OFF
SFT UP ST SW* Paddle shifter (shift-up) is pulled ON
Other than the above OFF
DOWN SW LEVER Selector lever is shifted to
− side ON
Other than the above OFF
UP SW LEVER Selector lever is shifted to + side ON
Other than the above OFF
NON M-MODE SW Selector lever is shifted to manual shift gate side OFF
Other than the above ON
MANU MODE SW Selector lever is shifted to manual shift gate side ON
Other than the above OFF
TOW MODE SW To w m o d e O N
Other than the above OFF
DS RANGE* Driving with DS mode ON
Other than the above OFF
1 POSITION SW* Selector lever in “1” position ON
Other than the above OFF
Item name Condition Value / Status (Approx.)
Revision: 2010 May2011 QX56

TCM
TM-71
< ECU DIAGNOSIS INFORMATION > [7AT: RE7R01B]
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OD CONT SW* When overdrive control switch is depressed ON
When overdrive control switch is released OFF
BRAKESW Brake pedal is depressed ON
Brake pedal is released OFF
POWERSHIFT SW* Power mode ON
Other than the above OFF
ASCD-OD CUT When TCM receives ASCD OD cancel request signal ON
Other than the above OFF
ASCD-CRUISE ASCD operate ON
Other than the above OFF
ABS SIGNAL ABS operate ON
Other than the above OFF
TCS GR/P KEEP When TCM receives TCS gear keep request signal ON
Other than the above OFF
TCS SIGNAL 2 When the reception value of A/T shift schedule change
demand signal is “cold”
ON
Other than the above OFF
TCS SIGNAL 1 When the reception value of A/T shift schedule change
demand signal is “warm”
ON
Other than the above OFF
LOW/B PARTS At 4GR - 5GR - 6GR
shift control FAIL
Other than the above NOTFAIL
HC/IC/FRB PARTS At 1GR - 2GR - 3GR
shift control FAIL
Other than the above NOTFAIL
IC/FRB PARTS At 4GR - 5GR - 6GR
shift control FAIL
Other than the above NOTFAIL
HLR/C PARTS At 4GR - 5GR - 6GR
shift control FAIL
Other than the above NOTFAIL
W/O THL POS Accelerator pedal is fully depressed ON
Accelerator pedal is released OFF
CLSD THL POS Accelerator pedal is released ON
Accelerator pedal is fully depressed OFF
DRV CST JUDGE Accelerator pedal is depressed DRIVE
Accelerator pedal is released COAST
Item name Condition Value / Status (Approx.)
Revision: 2010 May2011 QX56

TM-72
< ECU DIAGNOSIS INFORMATION >[7AT: RE7R01B]
TCM
SHIFT IND SIGNALWhen the selector lever is positioned in between each po-
sition.
OFF
Selector lever in “P” position P
Selector lever in “R” position R
Selector lever in “N” position N
Selector lever in “D” position D
Selector lever in “D” position: 7GR
Selector lever in “D” position: 6GR 6
Selector lever in “D” position: 5GR 5
Selector lever in “D” position: 4GR 4
Selector lever in “D” position: 3GR 3
Selector lever in “D” position: 2GR 2
Selector lever in “D” position: 1GR 1
Selector lever in “M” position: 1GR M1
Selector lever in “M” position: 2GR M2
Selector lever in “M” position: 3GR M3
Selector lever in “M” position: 4GR M4
Selector lever in “M” position: 5GR M5
Selector lever in “M” position: 6GR M6
Selector lever in “M” position: 7GR M7
Driving with DS mode DS
STARTER RELAY Selector lever in “P
” and “N” positions ON
Other than the above OFF
F-SAFE IND/L For 2 seconds after the ignition switch is turned ON ON
Other than the above OFF
ATF WARN LAMP* When TCM transmits the ATF indicator lamp signal ON
Other than the above OFF
MANU MODE IND Driving with manual mode ON
Other than the above OFF
ON OFF SOL MON Selector lever in “P
” and “N” positions
ON
Driving with 1GR to 3GR
Other than the above OFF
START RLY MON Selector lever in “P
” and “N” positions ON
Other than the above OFF
ON OFF SOL Selector lever in “P
” and “N” positions
ON
Driving with 1GR to 3GR
Other than the above OFF
Item name Condition Value / Status (Approx.)
Revision: 2010 May2011 QX56