Infiniti F50. Manual — part 60
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
AT-125
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4.
CHECK POWER SOURCE CIRCUIT
1.
Turn ignition switch to “OFF” position.
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 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK DTC
Perform “DTC Confirmation Procedure”. Refer to
AT-117, "DTC Confirmation Procedure"
.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.
6.
PERFORM TCM INSPECTION
1.
Perform TCM input/output signal inspection.
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
ECS00A1L
TORQUE CONVERTER CLUTCH SOLENOID VALVE
Resistance check
1.
Turn ignition switch “OFF”.
2.
Remove oil pan. Refer to
AT-289, "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
.
Item
Connector No.
Terminal No. (Wire color)
Continuity
TCM
F103
20 (Y)
Yes
A/T unit assembly
harness connector
F27
8 (Y)
SCIA1831E
Solenoid Valve
Connector No.
Terminal No.
(Wire color)
Resistance (
Ω
)
(Approx.)
Torque converter clutch
solenoid valve
F301
11 (BR) - Ground
3 - 9
Ω
SCIA3061E
AT-126
DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)
Operation check
●
Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal 11 and ground.
SCIA3105E
DTC P0745 LINE PRESSURE SOLENOID VALVE
AT-127
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DTC P0745 LINE PRESSURE SOLENOID VALVE
PFP:31940
Description
ECS0084S
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in
response to a signal sent from the TCM.
The line pressure duty cycle value is not consistent when the closed throttle position signal is “ON”.
To confirm the line pressure duty cycle at low pressure, the accelerator (throttle) should be open until
the closed throttle position signal is “OFF”.
On Board Diagnosis Logic
ECS0084T
●
This is an OBD-II self-diagnostic item.
●
Diagnostic trouble code “L/PRESS SOL/CIRC” with CONSULT-II or P0745 without 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 Cause
ECS0084U
●
Harness or connectors
(The solenoid circuit is open or shorted.)
●
Line pressure solenoid valve
DTC Confirmation Procedure
ECS0084V
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.
Turn ignition switch to “ON” position and select “DATA MONI-
TOR” mode for “ENGINE” with CONSULT-II.
2.
Engine start and wait at least 5 second.
3.
If DTC is detected, go to “
AT-129, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “With CONSULT-II”.
SAT014K
AT-128
DTC P0745 LINE PRESSURE SOLENOID VALVE
Wiring Diagram — AT — LPSV
ECS0084W
TCM terminal and data are reference value. Measured between each terminal and ground.
TCWM0007E
Terminal
No.
Wire
color
Item
Condition
Data (Approx.)
1
B/Y
Line pressure
solenoid valve
IGN ON
After warming up the engine, release your foot from the
accelerator pedal.
2V
After warming up the engine, press the accelerator pedal
all the way down.
0.7V
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