Infiniti M45 (Y34). Manual — part 60
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DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
AT-125
D
E
F
G
H
I
J
K
L
M
A
B
AT
TCM terminal and data are reference value. Measured between each terminal and ground.
Diagnostic Procedure
ACS0047Q
1.
CHECK INPUT SIGNALS
With CONSULT-II
1.
Start engine.
2.
Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T” with CONSULT-II.
3.
Read out the value of “TCC SOLENOID” while driving.
Check the value changes according to driving speed.
Without CONSULT-II
1.
Start engine.
2.
Check voltage between TCM connector and ground.
OK or NG
OK >> GO
TO
6.
NG
>> GO TO 2.
2.
CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect A/T unit assembly harness connector at the trans-
mission right side.
3.
Check the resistance between terminal and ground.
OK or NG
OK >> GO
TO
5.
NG
>> GO TO 3.
Terminal
No.
Wire
color
Item
Condition
Data (Approx.)
20
Y
TCC solenoid
valve
When
vehicle
cruises
When lock-up
More than 2V
When not lock-up
0V
Item name
Condition
Display value (Approx.)
TCC SOLENOID
When perform slip lock-
up
0.2 - 0.4A
When perform lock-up
0.4 - 0.6A
SCIA4462E
Item
Connec-
tor No.
Terminal
No.
Condition
Data
(Approx.)
TCC sole-
noid valve
F103
20 (Y) -
Ground
When lock-up
More than
2V
When not lock-up
0V
SCIA4464E
Solenoid valve
Connector No.
Terminal No.
Resistance (Approx.)
Torque converter clutch
solenoid valve
F27
8 - Ground
3 - 9
Ω
SCIA1830E
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AT-126
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
3.
CHECK TERMINAL CORD ASSEMBLY
1.
Remove oil pan. Refer to
AT-312, "Control Valve Assembly"
2.
Disconnect A/T unit assembly harness connector and control valve assembly harness connector.
3.
Check continuity between A/T unit assembly harness connector
and control valve assembly harness connector.
4.
If OK, check harness for short to ground and short to power.
5.
Reinstall any part removed.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK VALVE RESISTANCE
Check valve resistance
●
Refer to
AT-127, "Component Inspection"
OK or NG
OK >> GO
TO
6.
NG
>> Replace the control valve assembly. Refer to
AT-312, "Control Valve Assembly"
5.
CHECK POWER SOURCE CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect TCM connector.
3.
Check continuity between A/T unit assembly harness connector
and TCM connector.
4.
If OK, check harness for short to ground and short to power.
5.
Reinstall any part removed.
OK or NG
OK
>> GO TO 6.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-123, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.
Item
Connector No.
Terminal No. (Wire color)
Continuity
A/T unit assembly
harness connector
F27
8 (R/B)
Yes
Control valve assem-
bly harness connec-
tor
F301
11 (R/B)
SCIA3060E
Item
Connector No.
Terminal No. (Wire color)
Continuity
TCM
F103
20 (Y)
Yes
A/T unit assembly
harness connector
F27
8 (Y)
SCIA1831E
![](/vehicles/zatt/gestal/lethord/irzama.png)
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
AT-127
D
E
F
G
H
I
J
K
L
M
A
B
AT
7.
CHECK TCM
1.
Check TCM input/output signal. Refer to
AT-86, "TCM Input/Output Signal Reference Values"
2.
If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> INSPECTION END
NG
>> Repair or replace damaged parts.
Component Inspection
ACS0047R
TORQUE CONVERTER CLUTCH SOLENOID VALVE
Resistance Check
1.
Turn ignition switch OFF.
2.
Remove oil pan. Refer to
AT-312, "Control Valve Assembly"
3.
Disconnect control valve assembly harness connector.
4.
Check resistance between terminal and ground.
5.
If NG, replace control valve assembly. Refer to
.
Operation Check
●
Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal 11 and ground.
Solenoid Valve
Connector No.
Terminal No.
(Wire color)
Resistance
(Approx.)
Torque converter clutch
solenoid valve
F301
11 (BR) - Ground
3 - 9
Ω
SCIA3061E
SCIA3105E
![](/vehicles/zatt/gestal/lethord/hong.png)
AT-128
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
PFP:31940
Description
ACS0047S
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 Value
ACS004P3
On Board Diagnosis Logic
ACS0047T
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “A/T TCC S/V FNCTN” with CONSULT-II or P0744 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 Cause
ACS0047U
●
Harness or connectors
(The solenoid circuit is open or shorted.)
●
Torque converter clutch solenoid valve
●
Hydraulic control circuit
DTC Confirmation Procedure
ACS0047V
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting 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)]
–
Check that “GEAR” shows “5”.
–
For shift schedule, refer to
AT-62, "Vehicle Speed When Performing and Releasing Complete Lock-
.
–
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-131, "Diagnostic Procedure"
Refer to shift schedule,
AT-62, "Vehicle Speed When Performing and Releasing Complete Lock-Up"
Item name
Condition
Display value (Approx.)
TCC SOLENOID
When perform slip lock-up
0.2 - 0.4A
When perform lock-up
0.4 - 0.6A
SAT014K
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