Lexus SC300 / Lexus SC400. Manual — part 85
OK
NG
2
Check harness and connector between battery and No. 4 solenoid valve, No. 4 solenoid valve
and ECM (See page IN–33).
Repair or replace harness or connector.
Proceed to next circuit inspection shown on ma-
trix chart (See page AT–66). However, when diag.
trouble code 64 is display, check and replace ECM.
–
A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
AT–97
This sensor detects the rotation speed of the O/D input shaft from the
rotation of the O/D direct clutch drum.
Its construction is the same as that of the No. 2 vehicle speed sensor
(See page AT–86).
By comparing the O/D direct clutch speed signal and the No. 2 vehicle
speed sensor signal, ECM detects the shift timing of the gears and ap-
propriately controls the engine torque and hydraulic pressure in re-
sponse to various conditions, thus performing smooth gear shift.
DTC
67
O/D Direct Clutch Speed Sensor Circuit
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
67
All conditions below are detected for 4 secs. or more
2 trip detection logic*
(a) Gear position: 1st, 2nd and 3rd
(b) T/M input shaft rpm: 100 rmp or more
(c) T/M output shaft rpm: less than 300 rpm
(d) PNP: OFF (other than P or N position)
O/D direct clutch speed sensor.
Harness or connector between O/D direct
clutch speed sensor and ECM.
ECM
*: See page AT–62.
Reference
Wave form between terminals NCO
+
and NCO
–
during engine idling.
AT–98
–
A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
AT–66
IN–33
WIRING DIAGRAM
DIAGNOSTIC CHART
DIAGNOSTIC CHART
–
A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
AT–99
NG
NG
OK
NG
INSPECTION PROCEDURE
1
Check resistance between terminals NCO
+
and NCO
–
of ECM connector.
C
OK
P
Connect the check harness A to the ECM (See EG sec-
tion).
Check resistance between terminals NCO
+
and NCO
–
of ECM connector.
Resistance:
560 – 680
Proceed to next circuit inspection shown on matrix chart
(See page AT–66). However, when diag. trouble code 67
is displayed, check and replace ECM.
2
Check O/D direct clutch speed sensor.
C
OK
Hint
P
OK
C
Remove O/D direct clutch speed sensor from transmis-
sion (See page AT–17).
Measure resistance between terminals 1 and 2 of O/D
direct clutch speed sensor.
Resistance:
560 – 680
Reference
Check the speed sensor function
Check voltage between terminals 1 and 2 of the speed
sensor when a magnet is put close to the front end of the
speed sensor then taken away quickly.
Voltage is generated intermittently.
The voltage generated is extremely low.
Replace O/D direct clutch speed sensor.
Check and repair harness and connector between
ECM and O/D direct clutch speed sensor (See
page IN–33).
AT–100
–
A304E (1UZ–FE) AUTOMATIC TRANSMISSION
TROUBLESHOOTING
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