Infiniti M45 (Y34). Manual — part 61
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
AT-129
D
E
F
G
H
I
J
K
L
M
A
B
AT
WITH GST
Follow the procedure “With CONSULT-II”.
AT-130
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
Wiring Diagram — AT — TCCSIG
ACS0047W
TCWA0114E
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
AT-131
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
ACS0047X
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
AT-132
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
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-133, "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 har-
ness connector
F27
8 (R/B)
Yes
Control valve assem-
bly harness connector
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
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