Lexus SC300 / Lexus SC400. Manual — part 84
–MEMO–
–
A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
AT–93
DTC
64
No. 3 Solenoid Valve Circuit
(For Lock–up Control Pressure Modulation)
CIRCUIT DESCRIPTION
The No. 3 solenoid valve is provided for lock–up operations.
The lock–up operation pressure is controlled by the linear sole-
noid for smooth engagement.
The amount of current flow to the solenoid is controlled by the
duty ratio (See page AT–82) of ECM output signal. The higher
the duty ration becomes, the higher the lock–up hydraulic pres-
sure becomes during the lock–up operation. If the malfunction
occurs in this circuit and diagnostic trouble code 64 is stored in
memory, the O/D OFF indicator light does not blink.
DTC No.
DTC Detecting Condition
Trouble Area
64
All conditions below are detected for 1 sec. or more.
2 trip detection logic*
(a) ECM outputs duty signal to No. 3 solenoid in 90%
or higher duty ration.
(b) Current to No. 3 solenoid: 450
100 mA or less.
No. 3 solenoid valve
Harness or connector between No. 3 sole-
noid valve and ECM.
ECM
*: See page AT–62
Reference
Waveform between terminals SLU– and E
1
when lock–up function is not operated.
Reference
Waveform between terminals SLU– and E
1
when lock–up function is operated.
AT–94
–
A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
AT–66
IN–33
WIRING DIAGRAM
DIAGNOSTIC CHART
DIAGNOSTIC CHART
–
A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
AT–95
OK
NG
INSPECTION PROCEDURE
1
Check No. 3 solenoid valve.
C
OK
P
C
OK
C
OK
C
OK
Check solenoid resistance
1.
Jack up the vehicle.
2.
Remove oil pan.
3.
Disconnect solenoid connector.
Measure resistance between terminals 1 and 2 of sole-
noid connector.
Resistance:
3.5 – 3.9
Check solenoid operation
Connect positive
lead with an 8 – 10 W bulb to termi-
nal 1 of solenoid connector and negative
lead to ter-
minal 2, then check the movement of the valve.
Reference
Check solenoid operation
1.
Prepare a variable power supply.
2.
Connect positive
lead of the variable power sup-
ply to terminal 1 of solenoid connector and negative
lead to terminal 2.
3.
Check the movement of the valve when the voltage
is gradually increased. (A current greater than 1 A
should not be supplied.)
As the voltage is increased, the valve should move
slowly in the
direction.
4.
Check the movement of the valve when the voltage
is cut off.
The valve should return in the
direction.
Replace No. 3 solenoid valve.
Go to step
.
AT–96
–
A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст