Infiniti Q45 (FY33). Manual — part 30
SAT543I
COMPONENT INSPECTION
Torque converter clutch solenoid valve
I
For removal, refer to AT-195.
Resistance check
I
Check resistance between two terminals.
Solenoid valve
Terminal No.
Resistance
(Approx.)
Torque converter
clutch solenoid
valve
q
7
Ground
10 - 20
Ω
SAT544I
Operation check
I
Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal and ground.
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0740
Torque Converter Clutch Solenoid Valve
(Cont’d)
AT-117
A/T TCC S/V Function (Lock-up)
DESCRIPTION
I
This is an OBD-II self-diagnostic item and not available in TCM self-diagnosis.
I
This malfunction will not be detected while the O/D OFF indicator lamp is indicating another self-diagno-
sis malfunction.
I
This malfunction is detected when the A/T does not shift into fourth gear position or the torque converter
clutch does not lock up as instructed by the TCM. This is not caused by electrical malfunction (circuits open
or shorted) but by mechanical malfunction such as control valve sticking, improper solenoid valve
operation, malfunctioning oil pump or torque converter clutch, etc.
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
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
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
1
G/R
Line pressure
solenoid valve
When releasing accelerator pedal
after warming up engine.
1.5 - 2.5V
When depressing accelerator pedal
fully after warming up engine.
0V
2
W/B
Line pressure
solenoid valve
(with dropping
resistor)
When releasing accelerator pedal
after warming up engine.
5 - 14V
When depressing accelerator pedal
fully after warming up engine.
0V
5
G/B
Torque converter
clutch solenoid
valve
When A/T performs lock-up.
8 - 15V
When A/T does not perform lock-up.
0V
TROUBLE DIAGNOSIS FOR DTC P0744
AT-118
ON BOARD DIAGNOSTIC LOGIC
This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM as
follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is much lower than the position (4th) supposed by TCM, the slip ratio will be much
less than normal. In case the ratio does not reach the specified value, TCM judges this diagnosis malfunction.
This malfunction will be caused when shift solenoid valve B is stuck closed.
Gear position supposed by TCM
1
2
3
4
In case of gear position with no malfunc-
tions
1
2
3
4
In case of gear position with shift solenoid
valve B stuck closed
1
2
2
q
1
q
: P0744 is detected.
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: A/T TCC S/V FNCTN
A/T cannot perform lock-up even if
electrical circuit is good.
I
Torque converter clutch solenoid
valve
I
Line pressure solenoid valve
I
Each clutch
I
Hydraulic control circuit
: P0744
SAT014K
SAT971J
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMA-
TION PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
1)
Start engine and select “DATA MONITOR” mode for
“A/T” with CONSULT-II.
2)
Make sure that output voltage of A/T fluid temperature
sensor is within the range below.
FLUID TEMP SEN: 0.4 - 1.5V
If out of range, drive the vehicle to decrease the voltage
(warm up the fluid) or stop engine to increase the volt-
age (cool down the fluid).
3)
Select “TCC S/V FNCTN P0744” of “DTC WORK SUP-
PORT” mode for “A/T” with CONSULT-II and touch
“START”.
GI
MA
EM
LC
EC
FE
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0744
A/T TCC S/V Function (Lock-up) (Cont’d)
AT-119
SAT021J
4)
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.)
THROTTLE POSI: 1.0/8 - 2.0/8 (at all times during
step 4)
Selector lever: D position (OD “ON”)
TCC S/V DUTY: More than 94%
VHCL/S SE
⋅
A/T: Constant speed of more than 80
km/h (50 MPH)
I
Check that “GEAR” shows “4”.
I
For shift schedule, refer to SDS, AT-276.
I
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”.
5)
Make sure that “OK” is displayed. (If “NG” is displayed,
refer to “DIAGNOSTIC PROCEDURE”.)
Refer to “DIAGNOSTIC PROCEDURE”, AT-121.
Refer to shift schedule, AT-276.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II”.
TROUBLE DIAGNOSIS FOR DTC P0744
A/T TCC S/V Function (Lock-up) (Cont’d)
AT-120
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