2006 INFINITI M35 Factory Service Manual

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Page 201 of 5621

INFINITI M35 2006 Factory Service Manual AT-122
DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)
Revision: 2006 January2006 M35/M45
Diagnostic ProcedureNCS001LK
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition switch ON. (Do not

Page 202 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)
AT-123
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Revision: 2006 January2006 M35/M45
4. CHECK SUB-HARNESS
1. Remove control valve with TCM. Refer to AT-236, "

Page 203 of 5621

INFINITI M35 2006 Factory Service Manual AT-124
DTC P0725 ENGINE SPEED SIGNAL
Revision: 2006 January2006 M35/M45
DTC P0725 ENGINE SPEED SIGNALPFP:24825
DescriptionNCS001LL
The engine speed signal is sent from the ECM to the TCM.
CONSULT-II R

Page 204 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0725 ENGINE SPEED SIGNAL
AT-125
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Revision: 2006 January2006 M35/M45
Diagnostic ProcedureNCS001LQ
1. CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to AT-

Page 205 of 5621

INFINITI M35 2006 Factory Service Manual AT-126
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Revision: 2006 January2006 M35/M45
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVEPFP:31940
DescriptionNCS001LR
The torque converter clutch sol

AT-126
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Revision: 2006 January2006 M35/M45
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVEPFP:31940
DescriptionNCS001LR
The torque converter clutch solenoid valve is activated, with the gear in D3 , D4 , D5 , M4 and M5 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 ValueNCS001LS
On Board Diagnosis LogicNCS001LT
This is an OBD-II self-diagnostic item.
Diagnostic trouble code “P0740 TCC SOLENOID/CIRC” with CONSULT-II or 3rd judgement flicker with-
out 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 CauseNCS001LU
Torque converter clutch solenoid valve
Harness or connectors
(Solenoid circuit is open or shorted.)
DTC Confirmation ProcedureNCS001LV
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 “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T”
with CONSULT-II.
3. Touch “START”.
4. Start engine and maintain the following conditions for at least 5
consecutive seconds.
VHCL/S SEꞏA/T: 80 km/h (50 MPH) or more
ACCELE POSI: 0.5/8 - 1.0/8
SLCT LVR POSI: “D” position
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
5. If DTC is detected go to AT-127, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II”.
Item name Condition Display value (Approx.)
TCC SOLENOID Lock-up is active 0.4 - 0.6A
BCIA0030E

Page 206 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
AT-127
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Revision: 2006 January2006 M35/M45
Diagnostic ProcedureNCS001LW
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignitio

Page 207 of 5621

INFINITI M35 2006 Factory Service Manual AT-128
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
Revision: 2006 January2006 M35/M45
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)PFP:31940
DescriptionNCS001LX
This malfunction is detected when the A/T does

AT-128
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
Revision: 2006 January2006 M35/M45
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)PFP:31940
DescriptionNCS001LX
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 ValueNCS001LY
On Board Diagnosis LogicNCS001LZ
This is an OBD-II self-diagnostic item.
Diagnostic trouble code “P0744 A/T TCC S/V FNCTN” with CONSULT-II or 3rd judgement flicker without
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 CauseNCS001M0
Harness or connectors
(Solenoid circuit is open or shorted.)
Torque converter clutch solenoid valve
Hydraulic control circuit
DTC Confirmation ProcedureNCS001M1
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 SOL FUNCTN 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 - 0.6A
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 AT-366, "Vehicle Speed at Which Lock-Up Occurs/Releases" .
–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 AT- 1 2 9 , "
Diagnostic Procedure" .
Refer to shift schedule, AT-366, "
Vehicle Speed at Which Lock-Up Occurs/Releases" .
WITH GST
Follow the procedure “WITH CONSULT-II”.
Item name Condition Display value (Approx.)
TCC SOLENOID Lock-up is active 0.4 - 0.6A
BCIA0030E

Page 208 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
AT-129
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Revision: 2006 January2006 M35/M45
Diagnostic ProcedureNCS001M2
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition switch

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