2006 INFINITI QX56 brake fluid

AT-78
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
48
Others Shift point is low in “
D”
position. ON vehicle1. Vehicle speed sensor A/T and vehicle speed sensor MTR
AT- 111
,
AT- 1 3 2
2. Accelerator pedal position sensor AT- 1 2 4
3. CAN communication line AT- 9 6
4. Control valve with TCMAT- 2 3 0
49Judder occurs during
lock-up. ON vehicle1. Fluid level and state
AT- 5 1
2. Engine speed signalAT- 11 6
3. Turbine revolution sensorAT- 1 0 9
4. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT- 1 3 2
5. Accelerator pedal position sensor AT- 1 2 4
6. CAN communication line AT- 9 6
7. Torque converter clutch solenoid valveAT- 11 8
8. Control valve with TCMAT- 2 3 0
OFF vehicle 9. Torque converter AT- 2 6 4
50Strange noise in “
R”
position. ON vehicle
1. Fluid level and state
AT- 5 1
2. Engine speed signalAT- 11 6
3. CAN communication line AT- 9 6
4. Control valve with TCMAT- 2 3 0
OFF vehicle5. Torque converter
AT- 2 6 4
6. Oil pump assemblyAT- 2 8 2
7. Gear systemAT- 2 5 0
8. High and low reverse clutchAT- 2 9 6
9. Reverse brakeAT- 2 6 4
51Strange noise in “
N”
position. ON vehicle
1. Fluid level and state
AT- 5 1
2. Engine speed signalAT- 11 6
3. CAN communication line AT- 9 6
4. Control valve with TCMAT- 2 3 0
OFF vehicle5. Torque converter
AT- 2 6 46. Oil pump assemblyAT- 2 8 2
7. Gear systemAT- 2 5 0
52Strange noise in “
D”
position. ON vehicle
1. Fluid level and state
AT- 5 1
2. Engine speed signalAT- 11 6
3. CAN communication line AT- 9 6
4. Control valve with TCMAT- 2 3 0
OFF vehicle5. Torque converter
AT- 2 6 4
6. Oil pump assemblyAT- 2 8 2
7. Gear systemAT- 2 5 0
8. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 7
, AT- 1 8
.) AT- 2 6 4
No. Items
Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSISAT-79
DE
F
G H
I
J
K L
M A
B
AT
Revision: November 2009 2006 QX5653
Others Vehicle dose not
decelerate by engine
brake.
Refer to
AT-218,
"Vehicle Does Not
Decelerate By Engine
Brake" . ON vehicle
1. PNP switch
AT-105
2. Fluid level and state AT- 5 1
3. Control cable adjustmentAT-227
4. 1st position switchAT-218
5. ATF pressure switch 5AT-163
6. CAN communication line AT- 9 6
7. Control valve with TCMAT-230
OFF vehicle8. Input clutch
AT-2869. High and low reverse clutchAT-296
10. Direct clutchAT-298
54Engine brake does
not operate in
“2 ”
position. ON vehicle1. PNP switch
AT-105
2. Fluid level and state AT- 5 1
3. Control cable adjustmentAT-227
5. ATF pressure switch 6AT-165
6. CAN communication line AT- 9 6
7. Control valve with TCMAT-230
OFF vehicle8. Front brake (brake band)
AT-2649. Input clutchAT-286
10. High and low reverse clutchAT-296
55Engine brake does
not operate in
“1 ”
position. ON vehicle1. PNP switch
AT-105
2. Fluid level and state AT- 5 1
3. Control cable adjustmentAT-227
4. 1st position switchAT-218
5. ATF pressure switch 5AT-163
6. CAN communication line AT- 9 6
7. Control valve with TCMAT-230
OFF vehicle8. Input clutch
AT-2869. High and low reverse clutchAT-296
10. Direct clutchAT-298
No. ItemsSymptom Condition Diagnostic ItemReference
page

AT-80
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
56
Others Maximum speed low.
ON vehicle
1. Fluid level and state
AT- 5 1
2. Line pressure testAT- 5 2
3. Accelerator pedal position sensorAT- 1 2 4
4. CAN communication line AT- 9 6
5. Direct clutch solenoid valveAT- 1 4 7
6. Control valve with TCMAT- 2 3 0
OFF vehicle7. Torque converter
AT- 2 6 4
8. Oil pump assemblyAT- 2 8 2
9. Input clutchAT- 2 8 6
10. Gear systemAT- 2 5 0
11. High and low reverse clutchAT- 2 9 6
12. Direct clutchAT- 2 9 8
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8 .) AT- 2 6 4
14 Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8
.) AT- 2 6 4
57
Extremely large
creep. ON vehicle1. Engine idle speed
EC-76

2. CAN communication line AT- 9 6
3. ATF pressure switch 5AT- 1 6 3
OFF vehicle 4. Torque converter AT- 2 6 4
58With selector lever in
“
P ” position, vehicle
does not enter parking
condition or, with
selector lever in
another position, park-
ing condition is not
cancelled.
Refer to AT-180, "
In
“P” Position, Vehicle
Moves When Pushed"
. ON vehicle
1. PNP switch
AT- 1 0 5
2. Control cable adjustmentAT- 2 2 7
OFF vehicle 3. Parking pawl components AT- 2 5 0
59Vehicle runs with
transmission in
“P ”
position. ON vehicle1. PNP switch
AT- 1 0 5
2. Fluid level and state AT- 5 1
3. Control cable adjustmentAT- 2 2 7
4. Control valve with TCMAT- 2 3 0
5. Parking pawl componentsAT- 2 5 0
OFF vehicle 6. Gear system AT- 2 5 0
No. ItemsSymptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSISAT-81
DE
F
G H
I
J
K L
M A
B
AT
Revision: November 2009 2006 QX56
60
Others Vehicle runs with
transmission in
“N ”
position.
Refer to AT-181, "In
“N” Position, Vehicle
Moves" . ON vehicle
1. PNP switch
AT-105
2. Fluid level and state AT- 5 1
3. Control cable adjustmentAT-227
4. Control valve with TCMAT-230
OFF vehicle5. Input clutch
AT-286
6. Gear systemAT-250
7. Direct clutchAT-298
8. Reverse brakeAT-264
9. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to
AT- 1 7
, AT- 1 8 .) AT-264
10. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 7
, AT- 1 8
.) AT-264
61Engine does not start
in
“N ” or “P ” position.
Refer to AT-179, "Engine Cannot Be
Started In “P” or “N”
Position" . ON vehicle
1. Ignition switch and starter
PG-4
, SC-
10
2. Control cable adjustment
AT-227
3. PNP switchAT-105
62Engine starts in posi-
tions other than “
N” or
“ P ”. ON vehicle1. Ignition switch and starter
PG-4
, SC-
10
2. Control cable adjustment
AT-227
3. PNP switchAT-105
63Engine stall. ON vehicle1. Fluid level and state
AT- 5 1
2. Engine speed signalAT- 11 6
3. Turbine revolution sensorAT-109
4. Torque converter clutch solenoid valve AT- 11 8
5. CAN communication line AT- 9 6
6. Control valve with TCMAT-230
OFF vehicle 7. Torque converter AT-264
64Engine stalls when
select lever shifted
“N ”
→ “ D ”, “ R”. ON vehicle1. Fluid level and state
AT- 5 1
2. Engine speed signalAT- 11 6
3. Turbine revolution sensorAT-109
4. Torque converter clutch solenoid valve AT- 11 8
5. CAN communication line AT- 9 6
6. Control valve with TCMAT-230
OFF vehicle 7. Torque converter AT-264
No. ItemsSymptom Condition Diagnostic ItemReference
page

AT-82
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
65 OthersEngine speed does
not return to idle.
Refer to
AT-208,
"Engine Speed Does
Not Return to Idle" .ON vehicle 1. Fluid level and state
AT- 5 1
2. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 6 3,
AT- 1 4 7
3. ATF pressure switch 1 and front brake solenoid valve AT- 1 5 9,
AT- 1 4 3
4. Accelerator pedal position sensor AT- 1 2 4
5. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 111,
AT- 1 3 2
6. CAN communication line AT- 9 6
7. Control valve with TCMAT- 2 3 0
OFF vehicle8. Front brake (brake band)
AT- 2 6 49. Direct clutchAT- 2 9 8
No. ItemsSymptom Condition Diagnostic ItemReference
page

AT-138
DTC P1731 A/T 1ST ENGINE BRAKING
Revision: November 20092006 QX56
Diagnostic ProcedureECS00CHG
1. CHECK INPUT SIGNALS
With CONSULT-II
1. Start the engine.
2. Select “SELECTION FROM MENU” in “DATA MONITOR” for
"A/T" with CONSULT-II"
3. Drive vehicle in the “1 ” position (1st gear), and confirm the ON/
OFF actuation of “ATF PRES SW 2 ” and "ON OFF SOL".
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to AT- 1 6 7 , "
MAIN POWER SUPPLY AND GROUND CIR-
CUIT" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. DETECT MALFUNCTIONING ITEM
Check the following items:

The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.
OK or NG
OK >> Replace the control valve with TCM. Refer to AT- 2 3 0 , "Control Valve With TCM and A/T Fluid
Temperature Sensor 2" .
NG >> Repair or replace damaged parts.
4. CHECK DTC
Perform “DTC Confirmation Procedure ”.

Refer to AT- 1 3 7 , "DTC Confirmation Procedure" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
Item name Condition Display value
ON OFF
SOL Low coast brake engaged. Refer to
AT- 2 0
.ON
Low coast brake disengaged. Refer to AT- 2 0
.OFF
ATF PRES
SW 2 Low coast brake engaged. Refer to
AT- 2 0
.ON
Low coast brake disengaged. Refer to AT- 2 0
.OFF
PCIA0067E

AT-144
DTC P1757 FRONT BRAKE SOLENOID VALVE
Revision: November 20092006 QX56
Diagnostic ProcedureECS00CHY
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition switch “ ON”.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T”
with CONSULT-II.
3. Start engine.
4. Read out the value of “FR/B SOLENOID” while driving.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to AT- 1 6 7 , "
MAIN POWER SUPPLY AND GROUND CIR-
CUIT" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. DETECT MALFUNCTIONING ITEM
Check the following items:

The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.
OK or NG
OK >> Replace the control valve with TCM. Refer to AT- 2 3 0 , "Control Valve With TCM and A/T Fluid
Temperature Sensor 2" .
NG >> Repair or replace damaged parts.
4. CHECK DTC
Perform “DTC Confirmation Procedure ”.

Refer to AT- 1 4 3 , "DTC Confirmation Procedure" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
Item name Condition Display value
(Approx.)
FR/B SOLE-
NOID Front brake engaged. Refer to AT- 2 0
. 0.6 - 0.8 A
Front brake disengaged. Refer to AT- 2 0
.0 - 0.05 ASCIA4793E

AT-146
DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION
Revision: November 20092006 QX56
Diagnostic ProcedureECS00CI4
1. CHECK INPUT SIGNALS
With CONSULT-II
1. Start engine.
2. Select “SELECTION FROM MENU ” in “DATA MONITOR” mode
for “A/T ” with CONSULT-II.
3. Drive vehicle in the “D ” position (3rd
4th gear), and confirm
the ON/OFF actuation of the “ATF PRES SW 1 ” and electrical
current value of “FR/B SOLENOID ”.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to AT- 1 6 7 , "
MAIN POWER SUPPLY AND GROUND CIR-
CUIT" .
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3. DETECT MALFUNCTIONING ITEM
Check the following items:

The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.
OK or NG
OK >> Replace the control valve with TCM. Refer to AT- 2 3 0 , "Control Valve With TCM and A/T Fluid
Temperature Sensor 2" .
NG >> Repair or replace damaged parts.
4. CHECK DTC
Perform “DTC Confirmation Procedure ”.

Refer to AT- 1 4 5 , "DTC Confirmation Procedure" .
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
Item name Condition Display value
(Approx.)
FR/B SOLE-
NOID Front brake engaged. Refer to
AT- 2 0
. 0.6 - 0.8 A
Front brake disengaged. Refer to AT- 2 0
. 0 - 0.05 A
ATF PRES
SW 1 Front brake engaged. Refer to
AT- 2 0
.ON
Front brake disengaged. Refer to AT- 2 0
.OFF
SCIA4796E