check transmission fluid INFINITI QX56 2008 Factory Owner's Manual

TM-58
< COMPONENT DIAGNOSIS >
P0733 3GR INCORRECT RATIO
Diagnosis Procedure
INFOID:0000000001604064
1.CHECK CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to TM-32, "
CONSULT-III Functi on (TRANSMISSION)".
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to TM-38, "Diagnosis Procedure".
NO >> GO TO 2.
2.CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to TM-92, "
Diagnosis Procedure".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3.DETECT MALFUNCTION ITEM
Check A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4.REPLACE CONTROL VALVE WITH TCM
1. Replace control valve with TCM. Refer to TM-201, "
Control Valve with TCM and A/T Fluid Temperature
Sensor 2".
2. Perform TM-57, "
DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> Confirm malfunction phenomena by “ROAD TEST” to repair malfunctioning part. Refer to TM-189,
"Description".
Revision: March 2010 2008 QX56

TM-60
< COMPONENT DIAGNOSIS >
P0734 4GR INCORRECT RATIO
Diagnosis Procedure
INFOID:0000000001604069
1.CHECK CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to TM-32, "
CONSULT-III Functi on (TRANSMISSION)".
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to TM-38, "Diagnosis Procedure".
NO >> GO TO 2.
2.CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to TM-92, "
Diagnosis Procedure".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3.DETECT MALFUNCTION ITEM
Check A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4.REPLACE CONTROL VALVE WITH TCM
1. Replace control valve with TCM. Refer to TM-201, "
Control Valve with TCM and A/T Fluid Temperature
Sensor 2".
2. Perform TM-59, "
DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> Confirm malfunction phenomena by “ROAD TEST” to repair malfunctioning part. Refer to TM-189,
"Description".
Revision: March 2010 2008 QX56

TM-62
< COMPONENT DIAGNOSIS >
P0735 5GR INCORRECT RATIO
Diagnosis Procedure
INFOID:0000000001604074
1.CHECK CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to TM-32, "
CONSULT-III Functi on (TRANSMISSION)".
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to TM-38, "Diagnosis Procedure".
NO >> GO TO 2.
2.CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to TM-92, "
Diagnosis Procedure".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3.DETECT MALFUNCTION ITEM
Check A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4.REPLACE CONTROL VALVE WITH TCM
1. Replace control valve with TCM. Refer to TM-201, "
Control Valve with TCM and A/T Fluid Temperature
Sensor 2".
2. Perform TM-61, "
DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> Confirm malfunction phenomena by “ROAD TEST” to repair malfunctioning part. Refer to TM-189,
"Description".
Revision: March 2010 2008 QX56

P0740 TORQUE CONVERTERTM-63
< COMPONENT DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
P0740 TORQUE CONVERTER
DescriptionINFOID:0000000001604075
• The torque converter clutch solenoid valve is activated, with the gear in D4, D5 by the TCM in response to
signals sent from the input speed s ensor and accelerator pedal position s ensor (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-III Reference Val ue in Data Monitor ModeINFOID:0000000001604076
On Board Diagnosis LogicINFOID:0000000001604077
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0740” with CONSULT-III 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:0000000001604078
• Torque converter clutch solenoid valve
• Harness or connectors
(The solenoid circuit is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000001604079
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-III
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “ENGINE” with CONSULT-III.
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 vehic le uphill (increased engine load) will help maintain the driving
conditions required for this test.
4. If DTC is detected go to TM-63, "
Diagnosis Procedure".
WITH GST
Follow the procedure “With CONSULT-III”.
Diagnosis ProcedureINFOID:0000000001604080
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch “ON”.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start engine.
Item name Condition Display value (Approx.)
TCC SOLENOID When performing slip lock-up
0.2 - 0.4 A
When performing lock-up 0.4 - 0.6 A
Revision: March 2010 2008 QX56

TM-66
< COMPONENT DIAGNOSIS >
P0744 TORQUE CONVERTER
Diagnosis Procedure
INFOID:0000000001604086
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch “ON”.
2. Select “MAIN SIGNALS” in “DATA MONITO R” mode for “TRANSMISSION” with CONSULT-III.
3. Start the 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 TM-92, "
Diagnosis Procedure".
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 TM-201, "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 TM-65, "
DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
Item name Condition Display value (Approx.)
TCC SOLENOID When performing slip lock-up
0.2 - 0.4 A
When performing lock-up 0.4 - 0.6 A
Revision: March 2010 2008 QX56

TM-70
< COMPONENT DIAGNOSIS >
P1705 TP SENSOR
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3.CHECK DTC WITH ECM
With CONSULT-III
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “ENGINE” with CONSULT-III. Refer to TM-32, "
CONSULT-III
Function (TRANSMISSION)".
OK or NG
OK >> GO TO 4.
NG >> Check the DTC detected item. Refer to TM-116, "
DTC No. Index".
• If CAN communication line is detected, go to TM-38, "
Description".
4.CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to TM-69, "
DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> GO TO 5.
5.CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to TM-92, "
Diagnosis Procedure".
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
6.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 TM-201, "Control Valve with TCM and A/T Fluid
Temperature Sensor 2".
NG >> Repair or replace damaged parts.
Revision: March 2010 2008 QX56

P1710 TRANSMISSION FLUID TEMPERATURE SENSOR
TM-71
< COMPONENT DIAGNOSIS >
C EF
G H
I
J
K L
M A
B
TM
N
O P
P1710 TRANSMISSION FLUI D TEMPERATURE SENSOR
DescriptionINFOID:0000000001604099
The A/T fluid temperature sensor detects the A/ T fluid temperature and sends a signal to the TCM.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001604100
On Board Diagnosis LogicINFOID:0000000001604101
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1710 (A/T), P0710 (ENGINE)” with CONSULT-III is detected when TCM receives
an excessively low or high voltage from the sensor.
Possible CauseINFOID:0000000001604102
• Harness or connectors (The sensor circuit is open or shorted.)
• A/T fluid temperature sensors 1, 2
DTC Confirmation ProcedureINFOID:0000000001604103
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-III
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “ENGINE” with CONSULT-III.
3. Start engine and maintain the following conditions for at least 10 minutes (Total). (It is not necessary to maintain continuously.)
VHCL SPEED SE: 10 km/h (6 MPH) or more
THRTL POS SEN: More than 1.0/8
Selector lever: “D” position
4. If DTC is detected, go to TM-71, "
Diagnosis Procedure".
WITH GST
Follow the procedure “With CONSULT-III”.
Diagnosis ProcedureINFOID:0000000001604104
1.CHECK A/T FLUID TEMPERATURE SENSOR 1 SIGNAL
With CONSULT-III
1. Start engine.
2. Select “ECU INPUT SIGNALS” in “DATA MONITO R” mode for “TRANSMISSION” with CONSULT-III.
3. Read out the value of “ATF TEMP SE 1”.
OK or NG
OK >> GO TO 2.
NG >> GO TO 3.
Item name Condition °C ( °F) Display value (Approx.)
ATF TEMP SE 1 0 (32) - 20 (68) - 80 (176) 3.3 - 2.7 - 0.9 V
ATF TEMP SE 2 3.3 - 2.5 - 0.7 V
Item nameCondition °C ( °F) Display value (Approx.)
ATF TEMP SE 1 0 (32) - 20 (68) - 80 (176) 3.3 - 2.7 - 0.9 V
Revision: March 2010 2008 QX56

TM-72
< COMPONENT DIAGNOSIS >
P1710 TRANSMISSION FLUID TEMPERATURE SENSOR
2.CHECK A/T FLUID TEMPERATURE SENSOR 2 SIGNAL
With CONSULT-III
1. Start engine.
2. Select “ECU INPUT SIGNALS” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III.
3. Read out the value of “ATF TEMP SE 2”.
OK or NG
OK >> GO TO 8.
NG >> GO TO 5.
3.CHECK A/T FLUID TEMPERATURE SENSOR 1
Check A/T fluid temperature sensor 1. Refer to TM-73, "
Component Inspection".
OK or NG
OK >> GO TO 4.
NG >> Replace the control valve with TCM. Refer to TM-201, "
Control Valve with TCM and A/T Fluid
Temperature Sensor 2".
4.CHECK SUB-HARNESS
1. Disconnect transmission range switch connector and TCM connector.
2. Check continuity between transmission range switch connector (A) terminals and TCM connector (B) terminals.
3. If OK, check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> Replace open circuit or short to ground and short to power in harness or connectors.
5.CHECK A/T FLUID TEMPERATURE SENSOR 2
Check A/T fluid temperature sensor 2. Refer to TM-73, "
Component Inspection".
OK or NG
OK >> GO TO 6.
NG >> Replace the A/T fluid temperature sensor 2. Refer to TM-201, "
Control Valve with TCM and A/T
Fluid Temperature Sensor 2".
6.CHECK TERMINAL CORD ASSEMBLY
1. Disconnect A/T fluid temperature sensor 2 connector and TCM connector.
2. Check continuity between A/T fluid temperature sensor 2 con- nector terminals and TCM connector terminals.
Item name Condition °C (°F) Display value (Approx.)
ATF TEMP SE 2 0 (32) - 20 (68) - 80 (176) 3.3 - 2.5 - 0.7 V
Item Connector Terminal Continuity
Transmission range switch con-
nector F505 (A)
6
Ye s
TCM connector F503 (B)19
Transmission range switch con-
nector F505 (A)
7
Ye s
TCM connector F503 (B)18
JSDIA1330ZZ
Item Connector Terminal Continuity
A/T fluid temperature sensor 2
connector F507
1
Ye s
TCM connector F5023
A/T fluid temperature sensor 2
connector F507
2
Ye s
TCM connector F5025
SCIA5462E
Revision: March 2010 2008 QX56

P1710 TRANSMISSION FLUID TEMPERATURE SENSOR
TM-73
< COMPONENT DIAGNOSIS >
C EF
G H
I
J
K L
M A
B
TM
N
O P
3. If OK, check harness for short to ground and short to power.
OK or NG
OK >> GO TO 7.
NG >> Replace open circuit or short to ground and short to power in harness or connectors.
7.CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
1. Check TCM power supply and ground circuit. Refer to TM-92, "
Diagnosis Procedure".
2. Reinstall any part removed.
OK or NG
OK >> Replace the control valve with TCM. Refer to TM-201, "Control Valve with TCM and A/T Fluid
Temperature Sensor 2".
NG >> Repair or replace damaged parts.
8.CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to TM-71, "
DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> GO TO 1.
Component InspectionINFOID:0000000001604105
A/T FLUID TEMPERATURE SENSOR 1
1. Remove control valve with TCM. Refer to TM-201, "Control Valve with TCM and A/T Fluid Temperature
Sensor 2".
2. Check resistance between the transmission range switch con- nector (A) terminals.
3. If NG, replace the control valve with TCM. Refer to TM-201,
"Control Valve with TCM and A/T Fluid Temperature Sensor 2"
A/T FLUID TEMPERATURE SENSOR 2
1. Remove A/T fluid temperature sensor 2. Refer to TM-201, "Control Valve with TCM and A/T Fluid Temper-
ature Sensor 2".
2. Check resistance between terminals.
3. If NG, replace the A/T fluid te mperature sensor 2. Refer to TM-
201, "Control Valve with TCM and A/T Fluid Temperature Sen-
sor 2".
NameTerminalTemperature
°C
(° F) Resistance (Ap-
prox.) (k Ω)
0 (32) 15
A/T fluid temperature sensor 1 6-7 20 (68)6.5
80 (176) 0.9
JSDIA1331ZZ
NameTerminalTemperature
°C
(° F) Resistance (Ap-
prox.) (k Ω)
0 (32) 10
A/T fluid temperature sensor 2 1-2 20 (68) 4
80 (176) 0.5
SCIA5271E
Revision: March 2010 2008 QX56

P1774 LOW COAST BRAKE SOLENOIDTM-91
< COMPONENT DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
With CONSULT-III
1. Start the engine.
2. Select “SELECTION FROM MENU” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III.
3. Drive vehicle in the “1” or “2” position (“1
1” or “22” gear) and confirm the ON/OFF actuation of the “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 TM-92, "
Diagnosis Procedure".
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 TM-201, "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 TM-90, "
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
TM-9
ON
Low coast brake disengaged. Refer to TM-9
OFF
ATF PRES
SW 2 Low coast brake engaged. Refer to
TM-9
ON
Low coast brake disengaged. Refer to TM-9
OFF
Revision: March 2010 2008 QX56