Infiniti I35 (A33). Manual — part 40
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SAT820K
Description
NHAT0058
The torque converter clutch solenoid valve is activated, with the
gear in D
4
, by the TCM in response to signals sent from the vehicle
speed and throttle position sensors. Lock-up piston operation will
then be controlled.
Lock-up operation, however, is prohibited when A/T fluid tempera-
ture is too low.
When the accelerator pedal is depressed (less than 2.0/8) 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 VALUE IN DATA MONITOR
MODE
NHAT0058S01
Remarks: Specification data are reference values.
Monitor item
Condition
Specification
Torque converter clutch
solenoid valve duty
Lock-up OFF
"
Lock-up ON
Approximately 4%
"
Approximately 94%
TCM TERMINALS AND REFERENCE VALUE
NHAT0058S02
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
3
G/B
Torque converter
clutch solenoid
valve
When A/T performs lock-up.
8 - 15V
When A/T does not perform lock-up.
0V
On Board Diagnosis Logic
NHAT0225
Diagnostic trouble code TCC SOLENOID/CIRC with CONSULT-II
or P0740 without CONSULT-II is detected when TCM detects an
improper voltage drop when it tries to operate the solenoid valve.
Possible Cause
NHAT0226
Check the following items.
I
Torque converter clutch solenoid valve
I
Harness or connectors
(The solenoid circuit is open or shorted.)
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Description
AT-157
![](/vehicles/zatt/ltherawowha/yose/zerico.png)
SAT014K
SEF949Y
Diagnostic Trouble Code (DTC) Confirmation
Procedure
NHAT0227
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
NHAT0227S01
1)
Turn ignition switch ON. (Do not start engine.)
2)
Select “DATA MONITOR” mode for “ENGINE” with CON-
SULT-II and wait at least 1 second.
3)
Start engine and maintain the following conditions for at least
5 consecutive seconds.
VHCL SPEED SE: 80 km/h (50 MPH) or more
THROTTLE POSI: 0.5/8 - 1.0/8
Selector lever: D position (O/D ON)
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
WITH GST
NHAT0227S02
Follow the procedure “With CONSULT-II”.
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Diagnostic Trouble Code (DTC) Confirmation Procedure
AT-158
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Wiring Diagram — AT — TCV
NHAT0059
MAT480B
GI
MA
EM
LC
EC
FE
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Wiring Diagram — AT — TCV
AT-159
![](/vehicles/zatt/ltherawowha/yose/itomy.png)
Diagnostic Procedure
NHAT0060
1
CHECK SOLENOID VALVE RESISTANCE
1. Turn ignition switch to OFF position.
2. Disconnect terminal cord assembly connector in engine compartment.
3. Check resistance between terminal 5 (G/B) and ground.
SAT627JE
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
CHECK SOLENOID VALVE OPERATION
1. Remove oil pan. Refer to AT-282.
2. Check the following items:
I
Torque converter clutch solenoid valve
i. Check solenoid valve by listening for its operating sound while applying battery voltage to the terminal and ground.
SAT828K
I
Harness of terminal cord assembly for short or open
OK or NG
OK
©
GO TO 3.
NG
©
Repair or replace damaged parts.
3
CHECK POWER SOURCE CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect TCM harness connector.
3. Check continuity between terminal cord assembly connector terminal 5 (G/B) and TCM harness connector F51 terminal
3 (G/B). Refer to wiring diagram — AT — TCV.
Continuity should exist.
If OK, check harness for short to ground and short to power.
4. 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.
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE
Diagnostic Procedure
AT-160
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