Infiniti F50. Manual — part 59
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
AT-121
D
E
F
G
H
I
J
K
L
M
A
B
AT
Operation check
●
Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal 11 and ground.
SCIA3105E
AT-122
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
PFP:31940
Description
ECS0084M
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.
On Board Diagnosis Logic
ECS0084N
●
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
ECS0084O
●
Harness or connectors
(The solenoid circuit is open or shorted.)
●
Torque converter clutch solenoid valve
●
Hydraulic control circuit
DTC Confirmation Procedure
ECS0084P
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-357, "Vehicle Speed When Performing and Releasing Complete
–
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-124, "Diagnostic Procedure"
Refer to shift schedule,
AT-357, "Vehicle Speed When Performing and Releasing Complete Lock-up"
WITH GST
Follow the procedure “With CONSULT-II”.
SAT014K
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
AT-123
D
E
F
G
H
I
J
K
L
M
A
B
AT
Wiring Diagram — AT — TCCSIG
ECS0084Q
TCM terminal and data are reference value. Measured between each terminal and ground.
TCWM0006E
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
AT-124
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
Diagnostic Procedure
ECS00A1J
1.
CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE CIRCUIT
1.
Turn ignition switch to “OFF” position.
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
4.
NG
>> GO TO 2.
2.
CHECK TERMINAL CORD ASSEMBLY
1.
Remove oil pan. Refer to
AT-289, "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 3.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
3.
CHECK VALVE RESISTANCE
Check valve resistance
●
Refer to
AT-125, "Component Inspection"
OK or NG
OK >> GO
TO
5.
NG
>> Replace the control valve assembly. Refer to
AT-289, "Control Valve Assembly"
Solenoid valve
Connector No.
Terminal No.
(Wire color)
Resistance (Approx.)
Torque converter clutch
solenoid valve
F27
8 (Y) - Ground
3 - 9
Ω
SCIA1830E
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
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