1991 LEXUS SC400 Service Repair Manual

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Page 2689 of 4087

LEXUS SC400 1991 Service Repair Manual
NG
Type ING
Type II
NG
OK
INSPECTION PROCEDURE
1Check voltage between terminals VF1, VF2 and E1 of check connector.
C
P(2) Warm up engine at normal operating temperature.
(2) Connect terminals TE1 a

Page 2690 of 4087

$LEXUS SC400 1991 Service Repair Manual OKNG OKNG OKNG NOYES 3 Check for open and short in harness and connector between engine & ECT ECU an\ d main oxy- gen sensor, engine & ECT ECU and check connector (See page IN±27). Repair or replace$

Page 2691 of 4087

$LEXUS SC400 1991 Service Repair Manual OKNG OKNG NOYES 7Check each item found to be a possible cause of problem. Check each ciruit found to be a possible cause of trouble according to the re\ sults of the check in 1. The numbers in the ta$

Page 2692 of 4087

LEXUS SC400 1991 Service Repair Manual
±MEMO±TR±81
ENGINE TROUBLESHOOTING
WhereEverybodyKnowsYourName

Page 2693 of 4087

$LEXUS SC400 1991 Service Repair Manual Diag. Code 27, 29Sub±Oxygen Sensor Circuit CIRCUIT DESCRIPTION The sub±oxygen sensor is installed on the exhaust pipe. Its construction\ and operation is the same as the main oxygen sensor on pag$

Page 2694 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 2695 of 4087

$LEXUS SC400 1991 Service Repair Manual DIAGNOSTIC CHART DIAGNOSTIC CHART HINT: wWhen other codes are output in addition to 27 and 29 at the same time, check the ci\ rcuits for other codes first. w If diag. code 27 is displayed, check lef$

Page 2696 of 4087

LEXUS SC400 1991 Service Repair Manual
NGOK
OKNG
INSPECTION PROCEDURE
1Disconnect the engine & ECT ECU connector.
C
OK
P(2) Connect the Check Harness A.(See page TR±30)
(2) Disconnect engine & ECT ECU connector.
(2) Turn ignition switch

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