lock INFINITI QX56 2007 Factory Owner's Guide

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-83
< SERVICE INFORMATION >
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PCONSULT-II Function (A/T)INFOID:0000000003532259
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II REFERENCE VALUE
NOTICE:
1. The CONSULT-II electrically displays shift timing and lock-up timing (that is, operation timing of each sole-
noid).
Check for time difference between actual shift timing and the CONSULT-II display. If the difference is
noticeable, mechanical parts (except solenoids, sensors, etc.) may be malfunctioning. Check mechanical
parts using applicable diagnostic procedures.
2. Shift schedule (which implies gear position) displayed on CONSULT-II 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-II indicates the point where shifts are completed.
3. Display of solenoid valves on CONSULT-II changes at the start of shifting, while gear position is displayed
upon completion of shifting (which is computed by TCM).
9 B/R Starter relaySelector lever in “N”,“ P” positions. Battery voltage
Selector lever in other positions. 0V
10 B Ground Always 0V Te r m i n a l
No.Wire
colorItem Condition Data (Pyrex.)
TCM diagnostic mode Description
WORK SUPPORTSupports inspections and adjustments. Commands are transmitted to the TCM for setting the status
suitable for required operation, input/output signals are received from the TCM and received data is
displayed.
SELF-DIAG RESULTS Displays TCM self-diagnosis results.
DATA MONITOR Displays TCM input/output data in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read.
ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
FUNCTION TEST Conducted by CONSULT-II instead of a technician to determine whether each system is “OK” or “NG”.
ECU PART NUMBER TCM part number can be read.
Item name Condition Display value (Approx.)
ATF TEMP SE 1
0°C (32° F) - 20°C (68°F) - 80°C (176°F)3.3 - 2.7 - 0.9 V
ATF TEMP SE 23.3 - 2.5 - 0.7 V
TCC SOLENOIDWhen perform slip lock-up 0.2 - 0.4 A
When perform lock-up 0.4 - 0.6 A
SLCT LVR POSISelector 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 drivingApproximately matches the
speedometer reading.
ENGINE SPEED Engine runningClosely matches the tachometer
reading.

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-85
< SERVICE INFORMATION >
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X: Applicable, —: Not applicable
Items (CONSULT-II
screen terms)Malfunction is detected when...TCM self-di-
agnosisOBD-II (DTC)
“A/T” with
CONSULT-IIMIL indicator
lamp*1, “EN-
GINE” with
CONSULT-II or
GST
CAN COMM CIRCUIT • When a malfunction is detected in CAN communications U1000 U1000
STARTER RELAY/
CIRC• If this signal is ON other than in P or N position, this is judged to be a
malfunction.
(And if it is OFF in P or N position, this too is judged to be a malfunction.)P0615 —
TCM • TCM is malfunctioning. P0700 P0700
PNP SW/CIRC• PNP switch 1-4 signals input with impossible pattern
• “P” position is detected from N position without any other position being
detected in between.P0705 P0705
TURBINE REV S/CIRC• TCM does not receive the proper voltage signal from the sensor.
• TCM detects an irregularity only at position of 4th gear for turbine revo-
lution sensor 2.P0717 P0717
VEH SPD SEN/CIR AT
(Revolution sensor)• Signal from vehicle speed sensor A/T (Revolution sensor) not input due
to cut line or the like
• Unexpected signal input during running
• After ignition switch is turned ON, unexpected signal input from vehicle
speed sensor MTR before the vehicle starts movingP0720 P0720
ENGINE SPEED SIG • TCM does not receive the CAN communication signal from the ECM. P0725 —
TCC SOLENOID/CIRC • Normal voltage not applied to solenoid due to cut line, short, or the like P0740 P0740
A/T TCC S/V FNCTN• A/T cannot perform lock-up even if electrical circuit is good.
• TCM detects as irregular by comparing difference value with slip rota-
tion.P0744 P0744*2
L/PRESS SOL/CIRC• Normal voltage not applied to solenoid due to cut line, short, or the like
• TCM detects as irregular by comparing target value with monitor value.P0745 P0745
TP SEN/CIRC A/T• TCM does not receive the proper accelerator pedal position signals (in-
put by CAN communication) from ECM.P1705 P1705
ATF TEMP SEN/CIRC• During running, the ATF temperature sensor signal voltage is exces-
sively high or lowP1710 P0710
VEH SPD SE/CIR·MTR• Signal (CAN communication) from vehicle speed sensor MTR not input
due to cut line or the like
• Unexpected signal input during runningP1721 —
A/T INTERLOCK• Except during shift change, the gear position and ATF pressure switch
states are monitored and comparative judgement made.P1730 P1730
A/T 1ST E/BRAKING• Each ATF pressure switch and solenoid current is monitored and if a
pattern is detected having engine braking 1st gear other than in the "1"
position, a malfunction is detected.P1731 —
I/C SOLENOID/CIRC• Normal voltage not applied to solenoid due to functional malfunction,
cut line, short, or the like
• TCM detects as irregular by comparing target value with monitor value.P1752 P1752
I/C SOLENOID FNCTN • TCM detects that actual gear ratio is irregular, and relation between
gear position and condition of ATF pressure switch 3 is irregular during
depressing accelerator pedal. (Other than during shift change)
• TCM detects that relation between gear position and condition of ATF
pressure switch 3 is irregular during releasing accelerator pedal. (Other
than during shift change)P1754 P1754*2
FR/B SOLENOID/CIRC• Normal voltage not applied to solenoid due to functional malfunction,
cut line, short, or the like
• TCM detects as irregular by comparing target value with monitor value.P1757 P1757

AT-90
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS
*: Do not use, but displayed.LC/B SOL FUNCTN CHECK* — —
TCC SOL FUNCTN CHECKFollowing items for “TCC solenoid function (lock-up) ” can be con-
firmed.
• Self-diagnosis status (whether the diagnosis is being conducted
or not)
• Self-diagnosis result (OK or NG)• TCC solenoid valve
•Hydraulic control circuit DTC work support item Description Check item

DTC P0717 TURBINE REVOLUTION SENSOR
AT-103
< SERVICE INFORMATION >
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DTC P0717 TURBINE REVOLUTION SENSOR
DescriptionINFOID:0000000003532285
The turbine revolution sensor detects input shaft rpm (revolutions per minute). It is located on the input side of
the automatic transmission. Monitors revolution of sensor 1 and sensor 2 for non-standard conditions.
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000003532286
On Board Diagnosis LogicINFOID:0000000003532287
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0717 TURBINE REV S/CIRC” with CONSULT-II is detected under the following
conditions.
- When TCM does not receive the proper voltage signal from the sensor.
- When TCM detects an irregularity only at position of 4th gear for turbine revolution sensor 2.
Possible CauseINFOID:0000000003532288
• Harness or connectors
(The sensor circuit is open or shorted.)
• Turbine revolution sensor 1, 2
DTC Confirmation ProcedureINFOID:0000000003532289
CAUTION:
Always drive vehicle at a safe speed.
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 and maintain the following conditions for at least 5
consecutive seconds.
VHCL SPEED SE: 40 km/h (25 MPH) or more
ENGINE SPEED: 1,500 rpm or more
ACCELE POS: 0.5/8 or more
Selector lever: “D” position
Gear position (Turbine revolution sensor 1): 4th or 5th posi-
tion
Gear position (Turbine revolution sensor 2): All position
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions required for this test.
4. If DTC is detected, go to AT-103, "
Diagnosis Procedure".
WITH GST
Follow the procedure “With CONSULT-II”.
Diagnosis ProcedureINFOID:0000000003532290
1.CHECK INPUT SIGNAL
With CONSULT-II
Item name Condition Display value (rpm)
TURBINE REV During driving (lock-up ON) Approximately matches the engine speed.
BCIA0031E

AT-104
< SERVICE INFORMATION >
DTC P0717 TURBINE REVOLUTION SENSOR
1. Start engine.
2. Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for
“A/T” with CONSULT-II.
3. Vehicle start and read out the value of “TURBINE REV”.
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-158
.
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 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.
4.CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to AT-103, "
DTC Confirmation Procedure".
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
Item name Condition Display value (rpm)
TURBINE REV During driving (lock-up ON)Approximately matches the
engine speed.
PCIA0041E

DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)
AT-105
< SERVICE INFORMATION >
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DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)
DescriptionINFOID:0000000003532291
The revolution sensor detects the revolution of the idler gear parking pawl lock gear and emits a pulse signal.
The pulse signal is sent to the TCM which converts it into vehicle speed.
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000003532292
On Board Diagnosis LogicINFOID:0000000003532293
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0720 VEH SPD SEN/CIR AT” with CONSULT-II is detected under the following
conditions.
- When TCM does not receive the proper voltage signal from the sensor.
- After ignition switch is turned “ON”, irregular signal input from vehicle speed sensor MTR before the vehicle
starts moving.
Possible CauseINFOID:0000000003532294
• Harness or connectors
(The sensor circuit is open or shorted.)
• Revolution sensor
• Vehicle speed sensor MTR
DTC Confirmation ProcedureINFOID:0000000003532295
CAUTION:
• Always drive vehicle at a safe speed.
• Be careful not to rev engine into the red zone on the tachometer.
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. Drive vehicle and check for an increase of “VHCL/S SE·A/T”
value in response to “VHCL/S SE·MTR” value.
If the check result is NG, go to AT-107, "
Diagnosis Procedure".
If the check result is OK, go to following step.
4. Select “DATA MONITOR” mode for “ENGINE” with CONSULT-II.
5. Start engine and maintain the following conditions for at least 5
consecutive seconds.
VHCL SPEED SE: 30 km/h (19 MPH) or more
THRTL POS SEN: More than 1.0/8
Selector lever: “D” position
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
If the check result is NG, go to AT-107, "
Diagnosis Procedure".
If the check result is OK, go to following step.
6. Maintain the following conditions for at least 5 consecutive seconds.
ENGINE SPEED: 3,500 rpm or more
THRTL POS SEN: More than 1.0/8
Selector lever: “D” position
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
Item name Condition Display value (km/h)
VHCL/S SE·A/T During driving Approximately matches the speedometer reading.
BCIA0031E

DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
AT-111
< SERVICE INFORMATION >
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DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
DescriptionINFOID:0000000003532304
• The torque converter clutch solenoid valve is activated, with the gear in D4, D5 by the TCM in response to
signals sent from the vehicle speed sensor and accelerator pedal position sensor (throttle position sensor).
Torque converter clutch piston operation will then be controlled.
• Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
• When the accelerator pedal is depressed (less than 1/8) in lock-up condition, the engine speed should not
change abruptly. If there is a big jump in engine speed, there is no lock-up.
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000003532305
On Board Diagnosis LogicINFOID:0000000003532306
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0740 TCC SOLENOID/CIRC” with CONSULT-II is detected under the following
conditions.
- When TCM detects an improper voltage drop when it tries to operate the solenoid valve.
- When TCM detects as irregular by comparing target value with monitor value.
Possible CauseINFOID:0000000003532307
• Torque converter clutch solenoid valve
• Harness or connectors
(The solenoid circuit is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000003532308
CAUTION:
Always drive vehicle at a safe speed.
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 “ENGINE” with CONSULT-II.
3. Start engine and maintain the following conditions for at least 5
consecutive seconds.
VHCL SPEED SE: 80 km/h (50 MPH) or more
ACCELE POS: 0.5/8 - 1.0/8
SELECTOR LEVER: “D” position
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
4. If DTC is detected go to AT- 111 , "
Diagnosis Procedure".
WITH GST
Follow the procedure “With CONSULT-II”.
Diagnosis ProcedureINFOID:0000000003532309
1.CHECK INPUT SIGNAL
With CONSULT-II
Item name Condition Display value (Approx.)
TCC SOLENOIDWhen performing slip lock-up 0.2 - 0.4 A
When performing lock-up 0.4 - 0.6 A
BCIA0031E

AT-112
< SERVICE INFORMATION >
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
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 “TCC 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-158
.
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 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.
4.CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to AT- 111 , "
DTC Confirmation Procedure".
OK or NG
OK >>INSPECTION END
NG >> GO TO 2.
Item name Condition Display value (Approx.)
TCC SOLENOIDWhen performing slip lock-up 0.2 - 0.4 A
When performing lock-up 0.4 - 0.6 A
SCIA4793E