brake INFINITI QX56 2007 Factory Manual Online

AT-78
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
48
OthersShift point is low in “D”
position.ON vehicle1. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5
,
AT- 1 2 4
2. Accelerator pedal position sensorAT- 11 7
3. CAN communication lineAT- 9 1
4. Control valve with TCMAT- 2 1 0
49Judder occurs during
lock-up.ON vehicle1. Fluid level and stateAT- 5 1
2. Engine speed signalAT- 1 0 9
3. Turbine revolution sensorAT- 1 0 3
4. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT- 1 2 4
5. Accelerator pedal position sensorAT- 11 7
6. CAN communication lineAT- 9 1
7. Torque converter clutch solenoid valveAT- 111
8. Control valve with TCMAT- 2 1 0
OFF vehicle 9. Torque converterAT- 2 4 0
50Strange noise in “R”
position.ON vehicle1. Fluid level and stateAT- 5 1
2. Engine speed signalAT- 1 0 9
3. CAN communication lineAT- 9 1
4. Control valve with TCMAT- 2 1 0
OFF vehicle5. Torque converterAT- 2 4 0
6. Oil pump assemblyAT- 2 5 8
7. Gear systemAT- 2 2 8
8. High and low reverse clutchAT- 2 7 2
9. Reverse brakeAT- 2 4 0
51Strange noise in “N”
position.ON vehicle1. Fluid level and stateAT- 5 1
2. Engine speed signalAT- 1 0 9
3. CAN communication lineAT- 9 1
4. Control valve with TCMAT- 2 1 0
OFF vehicle5. Torque converterAT- 2 4 06. Oil pump assemblyAT- 2 5 8
7. Gear systemAT- 2 2 8
52Strange noise in “D”
position.ON vehicle1. Fluid level and stateAT- 5 1
2. Engine speed signalAT- 1 0 9
3. CAN communication lineAT- 9 1
4. Control valve with TCMAT- 2 1 0
OFF vehicle5. Torque converterAT- 2 4 0
6. Oil pump assemblyAT- 2 5 8
7. Gear systemAT- 2 2 8
8. Forward brake (Parts behind drum support is impossible to
perform inspection by disassembly. Refer to AT- 1 9
, AT- 2 0.)AT- 2 4 0
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-79
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
AT
N
O
P53
OthersVehicle dose not de-
celerate by engine
brake.
Refer to AT- 1 9 9 , "Ve -
hicle Does Not Decel-
erate By Engine
Brake".ON vehicle1. PNP switchAT- 9 9
2. Fluid level and stateAT- 5 1
3. Control cable adjustmentAT-208
4. 1st position switchAT-199
5. ATF pressure switch 5AT-154
6. CAN communication lineAT- 9 1
7. Control valve with TCMAT-210
OFF vehicle8. Input clutchAT-2629. High and low reverse clutchAT-272
10. Direct clutchAT-274
54Engine brake does not
operate in “2” position.ON vehicle1. PNP switchAT- 9 9
2. Fluid level and stateAT- 5 1
3. Control cable adjustmentAT-208
5. ATF pressure switch 6AT-156
6. CAN communication lineAT- 9 1
7. Control valve with TCMAT-210
OFF vehicle8. Front brake (brake band)AT-2409. Input clutchAT-262
10. High and low reverse clutchAT-272
55Engine brake does not
operate in “1” position.ON vehicle1. PNP switchAT- 9 9
2. Fluid level and stateAT- 5 1
3. Control cable adjustmentAT-208
4. 1st position switchAT-199
5. ATF pressure switch 5AT-154
6. CAN communication lineAT- 9 1
7. Control valve with TCMAT-210
OFF vehicle8. Input clutchAT-2629. High and low reverse clutchAT-272
10. Direct clutchAT-274
No. Items Symptom Condition Diagnostic ItemReference
page

AT-80
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
56
OthersMaximum speed low.ON vehicle1. Fluid level and stateAT- 5 1
2. Line pressure testAT- 5 1
3. Accelerator pedal position sensorAT- 11 7
4. CAN communication lineAT- 9 1
5. Direct clutch solenoid valveAT- 1 3 8
6. Control valve with TCMAT- 2 1 0
OFF vehicle7. Torque converterAT- 2 4 0
8. Oil pump assemblyAT- 2 5 8
9. Input clutchAT- 2 6 2
10. Gear systemAT- 2 2 8
11. High and low reverse clutchAT- 2 7 2
12. Direct clutchAT- 2 7 4
13. Forward one- way clutch (Parts behind drum support is
impossible to perform inspection by disassembly. Refer to AT-
19, AT- 2 0.)AT- 2 4 0
14 Forward brake (Parts behind drum support is impossible to
perform inspection by disassembly. Refer to AT- 1 9
, AT- 2 0.)AT- 2 4 0
57 Extremely large creep.ON vehicle1. Engine idle speed EC-75

2. CAN communication lineAT- 9 1
3. ATF pressure switch 5AT- 1 5 4
OFF vehicle 4. Torque converterAT- 2 4 0
58With selector lever in
“P” position, vehicle
does not enter parking
condition or, with se-
lector lever in another
position, parking con-
dition is not cancelled.
Refer to AT-168, "
In
"P" Position, Vehicle
Moves When
Pushed".ON vehicle1. PNP switchAT- 9 9
2. Control cable adjustmentAT- 2 0 8
OFF vehicle 3. Parking pawl componentsAT- 2 2 8
59Vehicle runs with
transmission in “P” po-
sition.ON vehicle1. PNP switchAT- 9 9
2. Fluid level and stateAT- 5 1
3. Control cable adjustmentAT- 2 0 8
4. Control valve with TCMAT- 2 1 0
5. Parking pawl componentsAT- 2 2 8
OFF vehicle 6. Gear systemAT- 2 2 8
No. Items Symptom Condition Diagnostic ItemReference
page

TROUBLE DIAGNOSIS
AT-81
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
AT
N
O
P
60
OthersVehicle runs with
transmission in “N” po-
sition.
Refer to AT- 1 6 9 , "In
"N" Position, Vehicle
Moves".ON vehicle1. PNP switchAT- 9 9
2. Fluid level and stateAT- 5 1
3. Control cable adjustmentAT-208
4. Control valve with TCMAT-210
OFF vehicle5. Input clutchAT-262
6. Gear systemAT-228
7. Direct clutchAT-274
8. Reverse brakeAT-240
9. Forward one- way clutch (Parts behind drum support is im-
possible to perform inspection by disassembly. Refer to AT-
19, AT- 2 0.)AT-240
10. Forward brake (Parts behind drum support is impossible
to perform inspection by disassembly. Refer to AT- 1 9
, AT- 2 0.)AT-240
61Engine does not start
in “N” or “P” position.
Refer to AT- 1 6 8 , "En-
gine Cannot Be Start-
ed in "P" or "N"
Position".ON vehicle1. Ignition switch and starterPG-3
, SC-
9
2. Control cable adjustmentAT-208
3. PNP switchAT- 9 9
62Engine starts in posi-
tions other than “N” or
“P”.ON vehicle1. Ignition switch and starterPG-3
, SC-
9
2. Control cable adjustmentAT-208
3. PNP switchAT- 9 9
63 Engine stall.ON vehicle1. Fluid level and stateAT- 5 1
2. Engine speed signalAT-109
3. Turbine revolution sensorAT-103
4. Torque converter clutch solenoid valveAT- 111
5. CAN communication lineAT- 9 1
6. Control valve with TCMAT-210
OFF vehicle 7. Torque converterAT-240
64Engine stalls when se-
lect lever shifted “N” →
“D”, “R”.ON vehicle1. Fluid level and stateAT- 5 1
2. Engine speed signalAT-109
3. Turbine revolution sensorAT-103
4. Torque converter clutch solenoid valveAT- 111
5. CAN communication lineAT- 9 1
6. Control valve with TCMAT-210
OFF vehicle 7. Torque converterAT-240
No. Items Symptom Condition Diagnostic ItemReference
page

AT-82
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
TCM Input/Output Signal Reference Value
INFOID:0000000003532258
A/T ASSEMBLY HARNESS CONNECTOR TERMINAL LAYOUT
TERMINAL AND REFERENCE VALUES FOR TCM
Data are reference value and are measured between each terminal and ground.
65 OthersEngine speed does
not return to idle.
Refer to AT-191, "En-
gine Speed Does Not
Return to Idle".ON vehicle1. Fluid level and stateAT- 5 1
2. ATF pressure switch 5 and direct clutch solenoid valveAT- 1 5 4,
AT- 1 3 8
3. ATF pressure switch 1 and front brake solenoid valveAT- 1 5 0,
AT- 1 3 4
4. Accelerator pedal position sensorAT- 11 7
5. Vehicle speed sensor A/T and vehicle speed sensor MTRAT- 1 0 5,
AT- 1 2 4
6. CAN communication lineAT- 9 1
7. Control valve with TCMAT- 2 1 0
OFF vehicle8. Front brake (brake band)AT- 2 4 09. Direct clutchAT- 2 7 4
No. Items Symptom Condition Diagnostic ItemReference
page
SCIA1658E
Te r m i n a l
No.Wire
colorItem Condition Data (Pyrex.)
1PPower supply
(Memory back-up)Always Battery voltage
2PPower supply
(Memory back-up)Always Battery voltage
3 L CAN-H – –
4VK-line (CONSULT-
II signal)The terminal is connected to the data link connector for CONSULT-II. –
5 B Ground Always 0V
6Y/RPower supply– Battery voltage
–0V
7RBack-up lamp re-
laySelector lever in “R” position. 0V
Selector lever in other positions. Battery voltage
8 P CAN-L – –

AT-84
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
CONSULT-II START PROCEDURE
Refer to GI-36, "CONSULT-II Start Procedure".
SELF-DIAGNOSTIC RESULT MODE
Operation Procedure
After performing SELF-DIAGNOSTIC RESULT MODE, place check marks for results on the AT-44, "How To
Perform Trouble Diagnosis for Quick and Accurate Repair". Reference pages are provided following the items.
Display Items List
LINE PRES SOL During driving 0.2 - 0.6 A
TURBINE REV During driving (lock-up ON)Approximately matches the en-
gine speed.
VHCL/S SE·MTR During drivingApproximately matches the
speedometer reading.
ATF PRES SW 1Front brake engaged. Refer to AT- 2 0
ON
Front brake disengaged. Refer to AT- 2 0
OFF
ATF PRES SW 2Low coast brake engaged. Refer to AT- 2 0
ON
Low coast brake disengaged. Refer to AT- 2 0
OFF
ATF PRES SW 3Input clutch engaged. Refer to AT- 2 0
ON
Input clutch disengaged. Refer to AT- 2 0
OFF
ATF PRES SW 5Direct clutch engaged. Refer to AT- 2 0
ON
Direct clutch disengaged. Refer to AT- 2 0
OFF
ATF PRES SW 6High and low reverse clutch engaged. Refer to AT- 2 0
ON
High and low reverse clutch disengaged. Refer to AT- 2 0
OFF
I/C SOLENOIDInput clutch disengaged. Refer to AT- 2 0
0.6 - 0.8 A
Input clutch engaged. Refer to AT- 2 0
0 - 0.05 A
FR/B SOLENOIDFront brake engaged. Refer to AT- 2 0
0.6 - 0.8 A
Front brake disengaged. Refer to AT- 2 0
0 - 0.05 A
D/C SOLENOIDDirect clutch disengaged. Refer to AT- 2 0
0.6 - 0.8 A
Direct clutch engaged. Refer to AT- 2 0
0 - 0.05 A
HLR/C SOLHigh and low reverse clutch disengaged. Refer to AT- 2 0
0.6 - 0.8 A
High and low reverse clutch engaged. Refer to AT- 2 0
0 - 0.05 A
ON OFF SOLLow coast brake engaged. Refer to AT- 2 0
ON
Low coast brake disengaged. Refer to AT- 2 0
OFF
STARTER RELAYSelector lever in “N”,“P” position. ON
Selector lever in other position. OFF
ACCELE POSIReleased accelerator pedal. 0.0/8
Fully depressed accelerator pedal. 8/8
CLSD THL POSReleased accelerator pedal. ON
Fully depressed accelerator pedal. OFF
W/O THL POSFully depressed accelerator pedal. ON
Released accelerator pedal. OFF
BRAKE SWDepressed brake pedal. ON
Released brake pedal. OFF Item name Condition Display value (Approx.)

TROUBLE DIAGNOSIS
AT-87
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
AT
N
O
P
X: Standard, —: Not applicable
Monitored item (Unit)Monitor Item Selection
Remarks ECU IN-
PUT SIG-
NALSMAIN SIG-
NALSSELEC-
TION
FROM
MENU
VHCL/S SE·A/T (km/h) X X X Revolution sensor
VHCL/S SE·MTR (km/h) X — X
ACCELE POSI (0.0/8) X — X Accelerator pedal position signal
THROTTLE POSI (0.0/8) X X XDegree of opening for accelerator recognized by
the TCM
For fail-safe operation, the specific value used
for control is displayed.
CLSD THL POS (ON-OFF display) X — X
Signal input with CAN communications
W/O THL POS (ON-OFF display) X — X
BRAKE SW (ON-OFF display) X — X Stop lamp switch
GEAR — X XGear position recognized by the TCM updated
after gear-shifting
ENGINE SPEED (rpm) X X X
TURBINE REV (rpm) X X X
OUTPUT REV (rpm) X X X
GEAR RATIO — X X
TC SLIP SPEED (rpm) — X XDifference between engine speed and torque
converter input shaft speed
F SUN GR REV (rpm) — — X
F CARR GR REV (rpm) — — X
ATF TEMP SE 1 (V) X — X
ATF TEMP SE 2 (V) X — X
ATF TEMP 1 (°C) — X X
ATF TEMP 2 (°C) — X X
BATTERY VOLT (V) X — X
ATF PRES SW 1 (ON-OFF display) X X X (for FR/B solenoid)
ATF PRES SW 2 (ON-OFF display) X X X (for LC/B solenoid)
ATF PRES SW 3 (ON-OFF display) X X X (for I/C solenoid)
ATF PRES SW 5 (ON-OFF display) X X X (for D/C solenoid)
ATF PRES SW 6 (ON-OFF display) X X X (for HLR/C solenoid)
PNP SW 1 (ON-OFF display) X — X
PNP SW 2 (ON-OFF display) X — X
PNP SW 3 (ON-OFF display) X — X
PNP SW 4 (ON-OFF display) X — X
SLCT LVR POSI — X XSelector lever position is recognized by the TCM.
For fail-safe operation, the specific value used
for control is displayed.
1 POSITION SW (ON-OFF display) X — X 1st position switch
OD CONT SW (ON-OFF display) X — X 4th position switch

AT-126
< SERVICE INFORMATION >
DTC P1730 A/T INTERLOCK
DTC P1730 A/T INTERLOCK
DescriptionINFOID:0000000003532342
• Fail-safe function to detect interlock conditions.
On Board Diagnosis LogicINFOID:0000000003532343
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1730 A/T INTERLOCK” with CONSULT-II is detected when TCM does not receive
the proper voltage signal from the sensor and switch.
• TCM monitors and compares gear position and conditions of each ATF pressure switch when gear is steady.
Possible CauseINFOID:0000000003532344
• Harness or connectors
(The solenoid and switch circuit is open or shorted.)
• Low coast brake solenoid valve
• ATF pressure switch 2
DTC Confirmation ProcedureINFOID:0000000003532345
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Start engine.
4. Drive vehicle and maintain the following conditions for at least 2
consecutive seconds.
Selector lever: “D” position
5. If DTC is detected, go to AT-127, "
Diagnosis Procedure".
WITH GST
Follow the procedure “With CONSULT-II”.
Judgement of A/T InterlockINFOID:0000000003532346
When A/T Interlock is judged to be malfunctioning, the vehicle should be fixed in 2nd gear, and should be set
in a condition in which it can travel.
When one of the following fastening patterns is detected, the fail-safe function in correspondence with the indi-
vidual pattern should be performed.
A/T INTERLOCK COUPLING PATTERN TABLE
BCIA0031E

DTC P1730 A/T INTERLOCK
AT-127
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
AT
N
O
P
l: NG, X: OK
Diagnosis ProcedureINFOID:0000000003532347
1.SELF-DIAGNOSIS
With CONSULT-II
1. Drive vehicle.
2. Stop vehicle and turn ignition switch “OFF”.
3. Turn ignition switch “ON”.
4. Select “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II.
OK or NG
OK >> GO TO 2.
NG >> Check low coast brake solenoid valve circuit and func-
tion. Refer to AT-146
, AT-148.
2.CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to AT-126, "
DTC Confirmation Procedure".
OK or NG
OK >>INSPECTION END
NG >> GO TO 3.
3.CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to AT-158
.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4.DETECT MALFUNCTIONING ITEM
Check the following items:
• The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> Replace the control valve with TCM. Refer to AT-210, "Control Valve with TCM and A/T Fluid Tem-
perature Sensor 2".
NG >> Repair or replace damaged parts.
Gear positionATF pressure switch output
Fail-safe
functionClutch pressure output pattern after fail-safe func-
tion
SW3
(I/C)SW6
(HLR/
C)SW5
(D/C)SW1
(FR/B)SW2
(LC/B)I/C HLR/C D/C FR/B LC/B L/U
A/T interlock
coupling pat-
tern3rd – X X –lHeld in
2nd gearOFF OFF ON OFF OFF OFF
4th – X X –lHeld in
2nd gearOFF OFF ON OFF OFF OFF
5th X X – XlHeld in
2nd gearOFF OFF ON OFF OFF OFF
BCIA0031E

AT-128
< SERVICE INFORMATION >
DTC P1731 A/T 1ST ENGINE BRAKING
DTC P1731 A/T 1ST ENGINE BRAKING
DescriptionINFOID:0000000003532348
Fail-safe function to prevent sudden decrease in speed by engine brake other than at "1" position.
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000003532349
On Board Diagnosis LogicINFOID:0000000003532350
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1731 A/T 1ST E/BRAKING” with CONSULT-II is detected under the following con-
ditions.
- When TCM does not receive the proper voltage signal from the sensor.
- When TCM monitors each ATF pressure switch and solenoid monitor value, and detects as irregular when
engine brake of 1st gear acts other than at 1 position.
Possible CauseINFOID:0000000003532351
• Harness or connectors
(The sensor circuit is open or shorted.)
• Low coast brake solenoid valve
• ATF pressure switch 2
DTC Confirmation ProcedureINFOID:0000000003532352
NOTE:
If “DTC Confirmation Procedure” has been previously preformed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Start engine.
4. Drive vehicle and maintain the following conditions for at least 2
consecutive seconds.
ENGINE SPEED: 1,200 rpm
Selector lever: “1” position
Gear position: 1st gear
5. If DTC is detected, go to AT-128, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003532353
1.CHECK INPUT SIGNALS
With CONSULT-II
Item name Condition Display value
ON OFF SOLLow coast brake engaged. Refer to AT- 2 0
.ON
Low coast brake disengaged. Refer to AT- 2 0
.OFF
ATF PRES SW 2Low coast brake engaged. Refer to AT- 2 0
.ON
Low coast brake disengaged. Refer to AT- 2 0
.OFF
BCIA0031E