1991 LEXUS SC400 Service Repair Manual

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Page 3497 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 3498 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

Page 3499 of 4087

$LEXUS SC400 1991 Service Repair Manual NGOK 3Check voltage between terminals HTL2, HTR2 of engine & ECT ECU connector and \ body ground. C OK Hint P(2) Connect engine & ECT ECU connector. (2) Warm up engine to normal operating temperatur$

Page 3500 of 4087

LEXUS SC400 1991 Service Repair Manual
±MEMO±
ENGINE TROUBLESHOOTINGTR±87
WhereEverybodyKnowsYourName

Page 3501 of 4087

$LEXUS SC400 1991 Service Repair Manual Diag. Code 35 High Altitude Compensator Sensor (HAC Sensor) Circuit CIRCUIT DESCRIPTION The HAC sensor is built into the ECU. This is a semiconductor pressure sens\ or with properties which cause its$

Page 3502 of 4087

LEXUS SC400 1991 Service Repair Manual
Diag. Code 31Air Flow Meter Circuit
CIRCUIT DESCRIPTION
As shown in the figure at right, when a pillar (Vortex
generating body) is placed in the path of a uniform flow,
vortices called Karman±Vor

Page 3503 of 4087

LEXUS SC400 1991 Service Repair Manual
DIAGNOSTIC CHART
DIAGNOSTIC
CHART
WIRING DIAGRAM
Check and replace ECU.Replace air flow meter. Check and replace ECU.
Check voltage of air flow meter power source. Check voltage terminal KS of ECU.

Page 3504 of 4087

LEXUS SC400 1991 Service Repair Manual
NGOK
OKNG
INSPECTION PROCEDURE
1Check voltage between terminals KS and E1 of engine & ECT ECU connector.
C
OK
PConnect the check harness A.
(See page TR±30)
Measure voltage between terminals KS and

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