2006 INFINITI QX56 Factory Service Manual

power steering oil pressure change language oil maintenance reset warning lights

Page 193 of 3383

INFINITI QX56 2006 Factory Service Manual AT-118
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Revision: November 20092006 QX56
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVEPFP:31940
DescriptionECS00CFN
The torque converter clutch sole

AT-118
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Revision: November 20092006 QX56
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVEPFP:31940
DescriptionECS00CFN
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 sen-
sor). 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 ValueECS00CFO
On Board Diagnosis LogicECS00CFP
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 CauseECS00CFQ
Torque converter clutch solenoid valve
Harness or connectors
(The solenoid circuit is open or shorted.)
DTC Confirmation ProcedureECS00CFR
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- 11 9 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “With CONSULT-II”.
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
BCIA0030E

Page 194 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVEAT-119
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Revision: November 2009 2006 QX56
Diagnostic ProcedureECS00CFS
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition

Page 195 of 3383

INFINITI QX56 2006 Factory Service Manual AT-120
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
Revision: November 20092006 QX56
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)PFP:31940
DescriptionECS00CFT
This malfunction is detected when the A/T does no

AT-120
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
Revision: November 20092006 QX56
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)PFP:31940
DescriptionECS00CFT
This malfunction is detected when the A/T does not shift into 5th gear position or the torque converter clutch
does not lock-up as instructed by the TCM. This is not only caused by electrical malfunction (circuits open or
shorted) but also by mechanical malfunction such as control valve sticking, improper solenoid valve operation,
etc.
CONSULT-II Reference ValueECS00CFU
On Board Diagnosis LogicECS00CFV
This is an OBD-II self-diagnostic item.
Diagnostic trouble code “P0744 A/T TCC S/V FNCTN ” with CONSULT-II 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 CauseECS00CFW
Harness or connectors
(The solenoid circuit is open or shorted.)
Torque converter clutch solenoid valve
Hydraulic control circuit
DTC Confirmation ProcedureECS00CFX
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. Start engine and Select “TCC S/V FNCTN CHECK” of “DTC
WORK SUPPORT ” mode for “A/T” with CONSULT-II 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
Selector lever: “D” position
[Reference speed: Constant speed of more than 80 km/h (50
MPH)]
–Make sure “GEAR” shows “5”.
–For shift schedule, refer to AT- 3 2 4 , "Vehicle Speed When Performing and Releasing Complete
Lock-up" .
–If “TESTING” does not appear on CONSULT-II for a long time, 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 AT- 1 2 1 , "
Diagnostic Procedure" .
Refer to shift schedule, AT- 3 2 4 , "
Vehicle Speed When Performing and Releasing Complete Lock-up" .
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
BCIA0030E

Page 196 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)AT-121
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Revision: November 2009 2006 QX56
WITH GST
Follow the procedure “With CONSULT-II”.
Diagnostic ProcedureECS00CFY
1. CHECK I

Page 197 of 3383

INFINITI QX56 2006 Factory Service Manual AT-122
DTC P0745 LINE PRESSURE SOLENOID VALVE
Revision: November 20092006 QX56
DTC P0745 LINE PRESSURE SOLENOID VALVEPFP:31940
DescriptionECS00CFZ
The line pressure solenoid valve regulates the oil pu

Page 198 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0745 LINE PRESSURE SOLENOID VALVEAT-123
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Revision: November 2009 2006 QX56
Diagnostic ProcedureECS00CG4
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition switch �

Page 199 of 3383

INFINITI QX56 2006 Factory Service Manual AT-124
DTC P1705 THROTTLE POSITION SENSOR
Revision: November 20092006 QX56
DTC P1705 THROTTLE POSITION SENSORPFP:22620
DescriptionECS00CGF
Electric throttle control actuator consists of throttle contr

Page 200 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P1705 THROTTLE POSITION SENSORAT-125
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Revision: November 2009 2006 QX56
2. CHECK DTC WITH TCM
With CONSULT-II
1. Turn ignition switch “ON”. (Do not start engine.)

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