1991 LEXUS SC400 Service Repair Manual

wiring diagram rear entertainment change language technical data fuel reserve inflation pressure

Page 3729 of 4087

LEXUS SC400 1991 Service Repair Manual
NGOK
OKNG
v
INSPECTION PROCEDURE
1Check output condition of diag. code 43.
C
OK
P
OK
C
Setting the test mode.
(2) Turn ignition switch OFF.
(2) Connect terminals TE2 and E1 of TDCL.
(2) Turn ignition

Page 3730 of 4087

$LEXUS SC400 1991 Service Repair Manual Diag. Code 52,53,55Knock Sensor Circuit CIRCUIT DESCRIPTION Knock sensors are fitted one each to the right bank and left bank of the cylinder block to detect\ engine knocking. This sensor contains$

Page 3731 of 4087

LEXUS SC400 1991 Service Repair Manual
CIRCUIT DESCRIPTION (Contd)
DIAGNOSIS CODE DETECTION DRIVING PATTERN
Purpose of the driving pattern.
(a) To simulate diag. code detecting condition after diag. code is recorded.
(b) To check that

Page 3732 of 4087

$LEXUS SC400 1991 Service Repair Manual DIAGNOSTIC CHART HINT: If diag. code 52 is displayed, check No. 1 knock sensor (for left bank)\ circuit.If diag. code 55 is displayed, check No. 2 knock sensor (for right bank\ ) circuit. If diag.$

Page 3733 of 4087

LEXUS SC400 1991 Service Repair Manual
NGOK
OKNG
INSPECTION PROCEDURE
1Check continuity between terminals KNK1, KNK2 of engine & ECT ECU connector and body
ground.
C
OK
P(2) Connect the Check Harness A.(See page TR±30)
(2) Disconnect t

Page 3734 of 4087

$LEXUS SC400 1991 Service Repair Manual OKNG NOYES 3 Check for open and short in harness and connectors between engine & ECT ECU a\ nd knock sensor (See page IN±27) Repair or replace harness or connector. 4Does malfunction disappear when$

Page 3735 of 4087

LEXUS SC400 1991 Service Repair Manual
±MEMO±
ENGINE TROUBLESHOOTINGTR±107
WhereEverybodyKnowsYourName

Page 3736 of 4087

LEXUS SC400 1991 Service Repair Manual
Diag. Code 71
EGR System Malfunction (Only for
USA spec.)
CIRCUIT DESCRIPTION
If even one of the following conditions is ful-
filled, the VSV is turned ON by a signal from
the ECU. This results in at

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