1991 LEXUS SC400 Service Repair Manual

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Page 3577 of 4087

LEXUS SC400 1991 Service Repair Manual
OKNG
OKNG
OKNG
3Check start injector time switch.
C
OK
PRemove start injector time switch (See page FI±88).
Measure resistance between terminals shown below.
Replace start injector time switch.
4Che

Page 3578 of 4087

LEXUS SC400 1991 Service Repair Manual
ISC Valve Circuit
CIRCUIT DESCRIPTION
The ISC valve is provided on the intake air chamber and in-
take air bypassing the throttle valve is directed to the ISC
valve through a hose.
A step motor is bu

Page 3579 of 4087

LEXUS SC400 1991 Service Repair Manual
OKNG
OKNG
INSPECTION PROCEDURE
1Check ISC value.
C
OK
P
P
OK
C
Disconnect ISC connector.
Measure resistance between terminals shown below.
Remove ISC Valve
(2) Connect the battery positive lead to t

Page 3580 of 4087

LEXUS SC400 1991 Service Repair Manual
Fuel Pressure Control VSV Circuit
CIRCUIT DESCRIPTION
The ECU turns on a VSV (Vacuum Switching Valve)
to draw the air into the diaphragm chamber of the
pressure regulator if it detects that the tempe

Page 3581 of 4087

LEXUS SC400 1991 Service Repair Manual
OKNG
INSPECTION PROCEDURE
1Check fuel pressure control VSV.
C
OK
P
OK
C
(2) Remove fuel pressure control VSV.
(2) Disconnect fuel pressure control VSV connector.
(2) Measure resistance between termin

Page 3582 of 4087

$LEXUS SC400 1991 Service Repair Manual NGOK OKNG 2Check voltage between terminal FPU of engine & ECT ECU connector and body gro\ und. C OK Hint P(2) Connect the Check Harness A.(See page TR±30) (2) Turn ignition switch on. Measure volta$

Page 3583 of 4087

LEXUS SC400 1991 Service Repair Manual
±MEMO±
±
ENGINE TROUBLESHOOTING Circuit InspectionTR±145
WhereEverybodyKnowsYourName

Page 3584 of 4087

$LEXUS SC400 1991 Service Repair Manual TE1, TE2 Terminal Circuit CIRCUIT DESCRIPTION Terminal TE1 is located in the check connector in the engine compartment and terminals T\ E1 and TE2 are lo- cated in the TDCL in the cabin. When these t$

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