2009 INFINITI QX56 Factory Service Manual

tire pressure reset dashboard dead battery steering wheel odometer headlamp

Page 3713 of 4171

INFINITI QX56 2009 Factory Service Manual
P0740 TORQUE CONVERTERTM-65
< COMPONENT DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
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

Page 3714 of 4171

INFINITI QX56 2009 Factory Service Manual
TM-66
< COMPONENT DIAGNOSIS >
P0744 TORQUE CONVERTER
P0744 TORQUE CONVERTER
DescriptionINFOID:0000000003771896
This malfunction is detected when the A/T does not lock-up. This is not only caused by e

TM-66
< COMPONENT DIAGNOSIS >
P0744 TORQUE CONVERTER
P0744 TORQUE CONVERTER
DescriptionINFOID:0000000003771896
This malfunction is detected when the A/T does not lock-up. This is not only caused by electrical malfunction
(circuits open or shorted) but also by mechanical malfunc tion such as control valve sticking, improper solenoid
valve operation, etc.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000003771897
On Board Diagn osis LogicINFOID:0000000003771898
This is an OBD-II self-diagnostic item.
Diagnostic trouble code “P0744” with CONSULT-III is detected under the following conditions.
- When A/T cannot perform lock-up even if electrical circuit is good.
- When TCM detects as irregular by comparing difference value with slip rotation.
Possible CauseINFOID:0000000003771899
Harness or connectors
(The solenoid circuit is open or shorted.)
Torque converter clutch solenoid valve
Hydraulic control circuit
DTC Confirmation ProcedureINFOID:0000000003771900
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 proc edure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Start engine and Select “TCC S/V FNCTN CHECK” of “DTC WORK SUPPORT” mode for “TRANSMIS-
SION” with CONSULT-III and touch “START”.
2. Accelerate vehicle to more than 80 km/h (50 MPH) and maintain the following condition continuously until “TESTING” has turned to “COMPLETE”. (It will take approximately 30 seconds after “TESTING” shows.)
ACCELE POSI: More than 1.0/8 (at all times during step 4)
TCC SOLENOID: 0.4 - 0.6 A
SLCT LVR POSI: “D” position
[Reference speed: Constant speed of more than 80 km/h (50 MPH)]
- Make sure “GEAR” shows “5”.
- For shift schedule, refer to TM-291, "Vehicle Speed at Which Lock-up Occurs/Releases"
.
- If “TESTING” does not ap pear on CONSULT-III for a long ti me, select “SELF-DIAG RESULTS”. In
case a 1st trip DTC other than P0744 is shown, refer to applicable “TROUBLE DIAGNOSIS FOR
DTC”.
3. Make sure that “OK” is displayed. (If “NG” is displayed, refer to “DIAGNOSTIC PROCEDURE”.)
Refer to TM-67, "Diagnosis Procedure"
.
Refer to shift schedule, TM-291, "Vehicle Speed at Which Lock-up Occurs/Releases"
.
WITH GST
Follow the procedure “With CONSULT-III”.
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: December 20092009 QX56

Page 3715 of 4171

INFINITI QX56 2009 Factory Service Manual
P0744 TORQUE CONVERTERTM-67
< COMPONENT DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
Diagnosis ProcedureINFOID:0000000003771901
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch “ON”.

Page 3716 of 4171

INFINITI QX56 2009 Factory Service Manual
TM-68
< COMPONENT DIAGNOSIS >
P0745 PRESSURE CONTROL SOLENOID A
P0745 PRESSURE CONTROL SOLENOID A
DescriptionINFOID:0000000003771902
The line pressure solenoid valve regulates the oil pump discharge

TM-68
< COMPONENT DIAGNOSIS >
P0745 PRESSURE CONTROL SOLENOID A
P0745 PRESSURE CONTROL SOLENOID A
DescriptionINFOID:0000000003771902
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in
response to a signal sent from the TCM.
The line pressure duty cycle value is not consistent when the closed throttle position signal is “ON”.
To confirm the line pressure duty cycle at low pressu re, the accelerator (throttle) should be open until
the closed throttle posi tion signal is “OFF”.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000003771903
On Board Diagnosis LogicINFOID:0000000003771904
This is an OBD-II self-diagnostic item.
Diagnostic trouble code “P0745” 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:0000000003771905
Harness or connectors
(The solenoid circuit is open or shorted.)
Line pressure solenoid valve
DTC Confirmation ProcedureINFOID:0000000003771906
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 proc edure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch “ON” and select “DATA MONITOR” mode for “ENGINE” with CONSULT-III.
2. Engine start and wait at least 5 second.
3. If DTC is detected, go to TM-68, "Diagnosis Procedure"
.
WITH GST
Follow the procedure “With CONSULT-III”.
Diagnosis ProcedureINFOID:0000000003771907
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 “LINE PRES SOL” while driving.
OK or NG
OK >> GO TO 4.
NG >> GO TO 2.
2.CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Item name Condition Display value (Approx.)
LINE PRES SOL During driving 0.2 - 0.6 A
Item name Condition Display value (Approx.)
LINE PRES SOL During driving 0.2 - 0.6 A
Revision: December 20092009 QX56

Page 3717 of 4171

INFINITI QX56 2009 Factory Service Manual
P0745 PRESSURE CONTROL SOLENOID ATM-69
< COMPONENT DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
Check TCM power supply and ground circuit. Refer to TM-92, "Diagnosis Procedure".
OK or NG
OK >> GO TO 3

Page 3718 of 4171

INFINITI QX56 2009 Factory Service Manual
TM-70
< COMPONENT DIAGNOSIS >
P1705 TP SENSOR
P1705 TP SENSOR
DescriptionINFOID:0000000003771908
Electric throttle control actuator consists of throttle control motor, accelerator pedal position sens

TM-70
< COMPONENT DIAGNOSIS >
P1705 TP SENSOR
P1705 TP SENSOR
DescriptionINFOID:0000000003771908
Electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle
position sensor, etc. The actuator sends a signal to the ECM, and ECM sends signals to TCM with CAN com-
munication.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000003771909
On Board Diagn osis LogicINFOID:0000000003771910
This is not an OBD-II self-diagnostic item.
Diagnostic trouble code “P1705” with CONSULT-III is detected when TCM does not receive the proper
accelerator pedal position signals (input by CAN communication) from ECM.
Possible CauseINFOID:0000000003771911
Harness or connectors
(The sensor circuit is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000003771912
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 proc edure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start engine and let it idle for 1 second.
4. If DTC is detected, go to TM-70, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003771913
1.CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to TM-32, "CONSULT-III Function (TRANSMISSION)"
.
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to TM-39.
NO >> GO TO 2.
2.CHECK DTC WITH TCM
With CONSULT-III
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “ECU INPUT SIGNALS” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III.
3. Depress accelerator pedal and read out the value of “ACCELE POSI”.
4. Select “SELF-DIAG RESULTS” mode for “T RANSMISSION” with CONSULT-III. Refer to TM-32, "CON-
SULT-III Function (TRANSMISSION)".
Item name Condition Display value (Approx.)
ACCELE POSIReleased accelerator pedal. 0.0/8
Fully depressed accelerator pedal. 8/8
Item name Condition
Display value
(Approx.)
ACCELE POSI Released accelerator pedal. 0.0/8
Fully depressed accelerator pedal. 8/8
Revision: December 20092009 QX56

Page 3719 of 4171

INFINITI QX56 2009 Factory Service Manual
P1705 TP SENSORTM-71
< COMPONENT DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
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 sta

Page 3720 of 4171

INFINITI QX56 2009 Factory Service Manual
TM-72
< COMPONENT DIAGNOSIS >
P1710 TRANSMISSION FLUID TEMPERATURE SENSOR
P1710 TRANSMISSION FLUID TEMPERATURE SENSOR
DescriptionINFOID:0000000003771914
The A/T fluid temperature sensor detects the A

TM-72
< COMPONENT DIAGNOSIS >
P1710 TRANSMISSION FLUID TEMPERATURE SENSOR
P1710 TRANSMISSION FLUID TEMPERATURE SENSOR
DescriptionINFOID:0000000003771914
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:0000000003771915
On Board Diagnosis LogicINFOID:0000000003771916
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:0000000003771917
Harness or connectors (The sensor circuit is open or shorted.)
A/T fluid temperature sensors 1
DTC Confirmation ProcedureINFOID:0000000003771918
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 proc edure 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/S SE-A/T: 10 km/h (6 MPH) or more
ACCELE POSI: More than 1.0/8
SLCT LVR POSI: “D” position
4. If DTC is detected, go to TM-72, "Diagnosis Procedure"
.
WITH GST
Follow the procedure “With CONSULT-III”.
Diagnosis ProcedureINFOID:0000000003771919
1.CHECK A/T FLUID TEMPERATURE SENSOR 1 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 1”.
OK or NG
OK >> GO TO 5.
NG >> GO TO 2.
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
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
Revision: December 20092009 QX56

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