2010 INFINITI QX56 lock

TM-106
< ECU DIAGNOSIS >
TCM
ECU DIAGNOSIS
TCM
Reference ValueINFOID:0000000005148688
REFERENCE VALUES
NOTICE:
1. The CONSULT-III electrically displays shift timing and lock-up timing (that is, operation timing of eachsolenoid).
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 using applicable diagnostic procedures.
2. Shift schedule (which implies gear position) display ed on CONSULT-III and that indicated in Service Man-
ual may differ slightly. This occurs because of the following reasons:
- Actual shift schedule has more or less tolerance or allowance,
- Shift schedule indicated in Service Manual refers to the point where shifts start, and
- Gear position displayed on CONSULT-III indicates the point where shifts are completed.
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).
Item name Condition Display value (Approx.)
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
TCC SOLENOID When perform slip lock-up.
0.2 - 0.4 A
When perform lock-up. 0.4 - 0.6 A
SLCT LVR POSI Selector lever in “N”,“P” position.
N/P
Selector lever in “R” position. R
Selector lever in “D” position. D
Selector lever in “4” position. 4
Selector lever in “3” position. 3
Selector lever in “2” position. 2
Selector lever in “1” position. 1
VHCL/S SE-A/T During driving Approximately matches the
speedometer reading.
ENGINE SPEED Engine running Closely matches the tachometer
reading.
LINE PRES SOL During driving 0.2 - 0.6 A
INPUT SPEED During driving (lock-up ON) Approximately matches the en-
gine speed.
VHCL/S SE-MTR During driving Approximately matches the
speedometer reading.
ATF PRES SW 2 Low coast brake engaged. Refer to
TM-9
.ON
Low coast brake disengaged. Refer to TM-9
.OFF
I/C SOLENOID Input clutch disengaged. Refer to
TM-9
.0.6 - 0 .8 A
Input clutch engaged. Refer to TM-9
.0 - 0 .0 5 A
FR/B SOLENOID Front brake engaged. Refer to
TM-9
.0 .6 - 0 .8 A
Front brake disengaged. Refer to TM-9
.0 - 0 .0 5 A
D/C SOLENOID Direct clutch disengaged. Refer to
TM-9
.0.6 - 0 .8 A
Direct clutch engaged. Refer to TM-9
.0 - 0 .0 5 A
HLR/C SOL High and low reverse clutch disengaged. Refer to
TM-9
.0.6 - 0 .8 A
High and low reverse clutch engaged. Refer to TM-9
.0 - 0 .0 5 A
Revision: April 20092010 QX56

TM-118
< ECU DIAGNOSIS >
TCM
Even when the electronic circuits are normal, under special conditions (for example, when slamming on the
brake with the wheels spinning drastically and stopping the tire rotation), the transmission can go into fail-safe
mode. If this happens, switch “OFF” the ignition switch for 10 seconds, then switch it “ON” again to return to
the normal shift pattern. Therefore, the customer's v ehicle has returned to normal, so handle according to the
“diagnostics flow” (Refer to TM-5, "
Work Flow").
FAIL-SAFE FUNCTION
If any malfunction occurs in a sensor or solenoid, th is function controls the A/T to mark driving possible.
Output Speed Sensor
• Signals are input from two systems - from output speed sensor installed on the transmission and from com-
bination meter so normal driving is possible even if there is a malfunction in one of the systems. And if output
speed sensor has unusual cases, 5GR is prohibited.
Accelerator Peda l Position Sensor
• If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM according
to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow sys-
tems, the engine speed is fixed by ECM to a pre-determined engine speed to make driving possible.
Throttle Position Sensor
• If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM according
to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow sys-
tems, the accelerator opening angle is controlled by the idle signal sent from the ECM which is based on
input indicating either idle condition or off-idle condition (pre-determined accelerator opening) in order to
make driving possible.
Transmission Range Switch
• In the unlikely event that a malfunction signal enters t he TCM, the position indicator is switched “OFF”, the
starter relay is switched “OFF” (starter starting is disabled), the back-up lamp relay switched “OFF” (back-up
lamp is OFF) and the position is fixed to the “D” position to make driving possible.
Starter Relay
• The starter relay is switched “OFF”. (Starter starting is disabled.)
Interlock
• If there is an interlock judgment malfunction, the trans mission is fixed in 2GR to make driving possible.
NOTE:
When the vehicle is driven fixed in 2GR, a input speed sensor malfunction is displayed, but this is
not a input speed sensor malfunction.
• When the interlock is detected at the 3GR or more, it is locked at the 2GR.
1st Engine Braking
• When there is an 1st engine brake judgment malfunction, the low coast brake solenoid is switched “OFF” to
avoid the engine brake operation.
Line Pressure Solenoid
• The solenoid is switched “OFF” and the line pressure is set to the maximum hydraulic pressure to make driv- ing possible.
Torque Converter Clutch Solenoid
• The solenoid is switched “OFF” to release the lock-up.
Low Coast Brake Solenoid
• When a (electrical or functional) malfunction occurs, in order to make driving possible, the engine brake isnot applied in 1GR and 2GR.
Input Clutch Solenoid
• If a (electrical or functional) malfunction occurs with the solenoid either “ON” or “OFF”, the transmission is
held in 4GR to make driving possible.
Direct Clutch Solenoid
• If a (electrical or functional) malfunction occurs with the solenoid either “ON” or “OFF”, the transmission is
held in 4GR to make driving possible.
Front Brake Solenoid
• If a (electrical or functional) malfunction occurs with the solenoid “ON”, in order to make driving possible, the
A/T is held in 5GR; if the solenoid is OFF, 4GR.
Revision: April 20092010 QX56

TCM
TM-119
< ECU DIAGNOSIS >
C EF
G H
I
J
K L
M A
B
TM
N
O P
High and Low Revers
e Clutch Solenoid
• If a (electrical or functional) malfunction occurs with the solenoid either “ON” or “OFF”, the transmission is
held in 4GR to make driving possible.
Input Speed Sensor 1 or 2
• The control is the same as if there were no input speed sensors, 5GR is prohibited.
DTC Inspection Priority ChartINFOID:0000000005148691
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC U1000 is displayed with other DTCs, first pe rform the trouble diagnosis for DTC U1000. Refer to
TM-40, "
Diagnosis Procedure".
DTC No. IndexINFOID:0000000005148692
NOTE:
If DTC U1000 is displayed with other DTC, first pe rform the trouble diagnosis for DTC U1000. Refer to
TM-40, "
Diagnosis Procedure".
Priority Detected items (DTC)
1 U1000 CAN COMM CIRCUIT
2 Except above
DTC
Items
(CONSULT- III screen terms) Reference
OBD- II
Except OBD- II
CONSULT- III GST (*1) CONSULT- III only
“TRANSMISSION”
— P0615STARTER RELAY TM-41
P0700P0700TRANSMISSION CONTROL TM-44
P0705P0705T/M RANGE SWITCH A TM-45
P0710P1710FLUID TEMP SENSOR TM-73
P0717P0717INPUT SPEED SENSOR A TM-48
P0720P0720OUTPUT SPEED SENSOR TM-51
—P0725ENGINE SPEED TM-53
P0731P07311GR INCORRECT RATIO TM-56
P0732P07322GR INCORRECT RATIO TM-58
P0733P07333GR INCORRECT RATIO TM-60
P0734P07344GR INCORRECT RATIO TM-62
P0735P07355GR INCORRECT RATIO TM-64
P0740P0740TORQUE CONVERTER TM-65
P0744 P0744 TORQUE CONVERTER TM-68
P0745P0745PC SOLENOID A TM-69
—P1705TP SENSOR TM-71
—P1721VEHICLE SPEED SIGNAL TM-76
P1730P1730INTERLOCK TM-78
—P17311GR E/BRAKING TM-80
P1752P1752INPUT CLUTCH SOLENOID TM-82
P1757P1757FR BRAKE SOLENOID TM-84
P1762P1762DRCT CLUTCH SOLENOID TM-86
P1767P1767HLR CLUTCH SOLENOID TM-88
Revision: April 20092010 QX56

TM-120
< ECU DIAGNOSIS >
TCM
*1: These numbers are prescribed by SAE J2012.
*2: These malfunctions cannot be displayed MIL if another malfunction is assigned to MIL.
DTC Alphabetical IndexINFOID:0000000005148693
NOTE:
If DTC U1000 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000. Refer to
TM-40, "
Diagnosis Procedure".
*1: These numbers are prescribed by SAE J2012.
*2: These malfunctions cannot be displayed MIL if another malfunction is assigned to MIL. P1772
P1772L C BRAKE SOLENOID TM-90
P1774 (2*) P1774 L C BRAKE SOLENOID TM-93
U1000U1000CAN COMM CIRCUIT TM-40
DTC
Items
(CONSULT- III screen terms) Reference
OBD- II
Except OBD- II
CONSULT- III GST (*1) CONSULT- III only
“TRANSMISSION”
Items
(CONSULT- III screen terms) DTC
Reference
OBD- II
Except OBD- II
CONSULT- III GST (*1) CONSULT- III only “TRANS-
MISSION”
1ST E/BRAKING —P1731TM-80
1GR INCORRECT RATIO P0731P0731TM-56
2GR INCORRECT RATIO P0732P0732TM-58
3GR INCORRECT RATIO P0733P0733TM-60
4GR INCORRECT RATIO P0734P0734TM-62
5GR INCORRECT RATIO P0735P0735TM-64
INTERLOCK P1730P1730TM-78
TORQUE CONVERTER P0744 P0744 TM-68
FLUID TEMP SENSOR P0710P1710TM-73
CAN COMM CIRCUIT U1000U1000TM-40
DRCT CLUTCH SOLENOID P1762P1762 TM-86
ENGINE SPEED —P0725TM-53
FR BRAKE SOLENOID P1757P1757TM-84
HLR CLUTCH SOLENOID P1767P1767TM-88
INPUT CLUTCH SOLENOID P1752P1752TM-82
PC SOLENOID A P0745P0745TM-69
L C BRAKE SOLENOID P1772P1772TM-90
L C BRAKE SOLENOID P1774 P1774 TM-93
T/M RANGE SWITCH A P0705P0705TM-45
STARTER RELAY —P0615TM-41
TORQUE CONVERTER P0740P0740TM-65
TRANSMISSION CONTROL P0700P0700TM-44
TP SENSOR —P1705TM-71
INPUT SPEED SENSOR A P0717P0717TM-48
VEHICLE SPEED SIGNAL —P1721TM-76
OUTPUT SPEED SENSOR P0720P0720TM-51
Revision: April 20092010 QX56

SYSTEM SYMPTOMTM-123
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
7
Shift
Shock Shock is too large for
upshift when accelera-
tor pedal is released.
ON vehicle1. Accelerator pedal position sensor
TM-71
2. Control cable adjustmentTM-164
3. Engine speed signal TM-53
4. CAN communication line LAN-4
5. Input speed sensorInput speed sensorTM-48
6. Output speed sensor and vehicle speed signalTM-50,
TM-76
7. Fluid level and state TM-148
8. Control valve with TCMTM-172
OFF vehicle9. Front brake (brake band)
TM-19210. Input clutchTM-227
11. High and low reverse clutchTM-237
12. Direct clutchTM-239
8Shock is too large for
lock-up. ON vehicle1. Accelerator pedal position sensor
TM-71
2. Control cable adjustmentTM-164
3. Engine speed signal TM-53
4. CAN communication line LAN-4
5. Input speed sensorTM-48
6. Output speed sensor and vehicle speed signalTM-50,
TM-76
7. Torque converter clutch solenoid valve TM-65
8. Fluid level and stateTM-148
9. Control valve with TCMTM-172
OFF vehicle 10. Torque converter TM-172
9Shock is too large dur-
ing engine brake. ON vehicle
1. Accelerator pedal position sensor
TM-71
2. Control cable adjustmentTM-164
3. CAN communication line LAN-4
4. Fluid level and stateTM-148
5. Control valve with TCMTM-172
OFF vehicle6. Front brake (brake band)
TM-1727. Input clutchTM-172
8. High and low reverse clutchTM-172
9. Direct clutchTM-172
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: April 20092010 QX56

TM-128
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
22Slips/Will
Not En-
gage When “D” position, re-
mains in 5GR.
ON vehicle1. Fluid level and state
TM-148
2. Output speed sensor and vehicle speed signal TM-50,
TM-76
3. Front brake solenoid valve TM-84
4. Line pressure testTM-157
5. CAN communication line LAN-4
6. Control valve with TCMTM-172
OFF vehicle7. Front brake (brake band)
TM-1728. Input clutchTM-172
9. Gear systemTM-172
10. High and low reverse clutchTM-172
23Vehicle cannot be
started from D1.ON vehicle
1. Fluid level and state
TM-148
2. Accelerator pedal position sensor TM-71
3. Line pressure testTM-157
4. CAN communication line LAN-4
5. Control valve with TCMTM-172
OFF vehicle6. Torque converter
TM-172
7. Oil pump assemblyTM-223
8. 3rd one-way clutchTM-172
9. 1st one-way clutchTM-232
10. Gear systemTM-172
11. Reverse brakeTM-172
12. Forward one-way clutch (Parts behind drum support is im-
possible to perform inspection by disassembly. Refer to TM-
8, TM-9. TM-172
13. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
TM-8
, TM-9. TM-172
24
Does not lock-up. ON vehicle1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Engine speed signal TM-53
4. Input speed sensorTM-48
5. Torque converter clutch solenoid valveTM-65
6. CAN communication line LAN-4
7. Control valve with TCMTM-172
OFF vehicle8. Torque converter
TM-1729. Oil pump assemblyTM-172
No. ItemsSymptom Condition Diagnostic ItemReference
page
Revision: April 20092010 QX56

SYSTEM SYMPTOMTM-129
< SYMPTOM DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
25
Slips/Will
Not en-
gage Does not hold lock-up
condition.
ON vehicle1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Engine speed signal TM-53
4. Input speed sensorTM-48
5. Torque converter clutch solenoid valveTM-65
6. CAN communication line LAN-4
7. Control valve with TCMTM-172
OFF vehicle8. Torque converter
TM-1729. Oil pump assemblyTM-172
26Lock-up is not re-
leased. ON vehicle1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Engine speed signal TM-53
4. Input speed sensorTM-48
5. Torque converter clutch solenoid valveTM-65
6. CAN communication line LAN-4
7. Control valve with TCMTM-172
OFF vehicle8. Torque converter
TM-1729. Oil pump assemblyTM-172
27No shock at all or the
clutch slips when vehi-
cle changes speed D1
→
D2. ON vehicle
1. Fluid level and state
TM-148
2. Output speed sensor and vehicle speed signal TM-50,
TM-76
3. Direct clutch solenoid valve TM-86
4. CAN communication line LAN-4
5. Line pressure testTM-157
6. Control valve with TCMTM-172
OFF vehicle7. Torque converter
TM-172
8. Oil pump assemblyTM-172
9. 3rd one-way clutchTM-172
10. Gear systemTM-172
11. Direct clutchTM-172
12. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to TM-8
, TM-9. TM-172
No. Items
Symptom Condition Diagnostic ItemReference
page
Revision: April 20092010 QX56

TM-136
< SYMPTOM DIAGNOSIS >
SYSTEM SYMPTOM
41Slips/Will
Not En-
gage While accelerating in
5th, engine races or
slippage occurs.
ON vehicle
1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Accelerator pedal position sensor TM-71
4. CAN communication line LAN-4
5. Front brake solenoid valveTM-84
6. Control valve with TCMTM-172
OFF vehicle7. Torque converter
TM-172
8. Oil pump assemblyTM-172
9. Front brake (brake band)TM-172
10. Input clutchTM-172
11. Gear systemTM-172
12. High and low reverse clutchTM-172
42Slips at lock-up. ON vehicle1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Engine speed signal TM-53
4. Input speed sensorTM-48
5. Torque converter clutch solenoid valveTM-65
6. CAN communication line LAN-4
7. Control valve with TCMTM-172
OFF vehicle8. Torque converter
TM-1729. Oil pump assemblyTM-172
43No creep at all. ON vehicle
1. Fluid level and state
TM-148
2. Line pressure testTM-157
3. Accelerator pedal position sensor TM-71
4. Direct clutch solenoid valveTM-86
5. Transmission range switchTM-45
6. CAN communication line LAN-4
7. Control cable adjustmentTM-164
8. Control valve with TCMTM-172
OFF vehicle9. Torque converter
TM-172
10. Oil pump assemblyTM-172
11. 1st one-way clutchTM-172
12. Gear systemTM-172
13. Reverse brakeTM-172
14. Direct clutchTM-172
15. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
TM-8
, TM-9. TM-172
16. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
TM-8
, TM-9. TM-172
No. Items
Symptom Condition Diagnostic ItemReference
page
Revision: April 20092010 QX56