1991 LEXUS SC400 Service Repair Manual

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Page 321 of 4087

$LEXUS SC400 1991 Service Repair Manual OKNG OKNG INSPECTION PROCEDURE 1Check operation of speedometer. Drive the vehicle and check if the operation of the speedometer in the c\ ombination meter is normal. The No. 1 vehicle speed sensor is$

Page 322 of 4087

LEXUS SC400 1991 Service Repair Manual
DTC46No. 4 Solenoid Valve Circuit (For Accumula-
tor Back Pressure Modulation)
CIRCUIT DESCRIPTION
The No. 4 solenoid valve controls the hydraulic pressure acting on the
brakes and clutches of the pl

Page 323 of 4087

LEXUS SC400 1991 Service Repair Manual
AT±66
IN±33
WIRING DIAGRAM
DIAGNOSTIC CHARTDIAGNOSTIC CHART
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±83
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Page 324 of 4087

LEXUS SC400 1991 Service Repair Manual
OKNG
INSPECTION PROCEDURE
1Check No. 4 solenoid valve.
C
OK
P
C
OK
C
OK
C
OK
Check solenoid resistance
1. Jack up the Vehicle
2. Remove the oil pan.
3. Disconnect the connector
Measure resistance bet

Page 325 of 4087

$LEXUS SC400 1991 Service Repair Manual OKNG 2Check harness and connector between battery and No. 4 solenoid valve, No. 4 solenoid valve\ and ECM (See page IN±33). Repair or replace harness or connector. Proceed to next circuit inspectio$

Page 326 of 4087

LEXUS SC400 1991 Service Repair Manual
DTC61No.2 Vehicle Speed Sensor Circuit
CIRCUIT DESCRIPTION
The No.2 speed sensor detects the rotation speed of the transmission output shaft and sends signals to the
ECM. The ECM determines the vehic

Page 327 of 4087

LEXUS SC400 1991 Service Repair Manual
IN±33AT±66
WIRING DIAGRAM
DIAGNOSTIC CHARTDIAGNOSTIC CHART
±
A304E (1UZ±FE) AUTOMATIC TRANSMISSION TROUBLESHOOTINGAT±87
WhereEverybodyKnowsYourName

Page 328 of 4087

LEXUS SC400 1991 Service Repair Manual
NGOK
OKNG
INSPECTION PROCEDURE
1Check resistance between terminals SP2+ and SP± of ECM connector.
C
OK
PConnect the check A to the ECM. (See EG section).
Check resistance between terminals SP
+ and

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