1991 LEXUS SC400 Service Repair Manual

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Page 3529 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG OKNG 4Check EGR system (See page EC±12). Repair EGR system. 5Check resistance of EGR gas temp. sensor. C OK PRemove EGR gas temp. sensor. Measure resistance between terminals of EGR gas te

Page 3530 of 4087

LEXUS SC400 1991 Service Repair Manual Diag. Code 71 EGR System Malfunction (Only for USA spec.) CIRCUIT DESCRIPTION The EGR system recirculates exhaust gas, which is controlled to the proper quantity to suit the driv\ ing condi- tions,

Page 3531 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 3532 of 4087

LEXUS SC400 1991 Service Repair Manual DIAGNOSTIC CHART WIRING DIAGRAM Check voltage of terminal EGR 1 ~ 4. Check voltage of EGR Step motor power source. Check resistance of EGR step motor. Check for open and short in harness and connecto

Page 3533 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK OKNG INSPECTION PROCEDURE 1Check voltage between terminals EGR 1 ~ 4 of engine & ECT ECU connector and b\ ody ground. C OK P(2) Connect the Check Harness A.(See page TR±30). (2) Turn ignition

Page 3534 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG OKNG 3Check resistance of EGR step motor. C OK PDisconnect EGR step motor connector. Measure resistance between terminals shown below. Replace EGR step motor. 4Check for open and short in h

Page 3535 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG OKNG 6Check resistance of EGR gas temp. sensor. C OK PDisconnect EGR gas temp. sensor connector (See page FI±103). Measure resistance between terminals of EGR gas temp. sensor connector. Resist

Page 3536 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM Diag. Code 78Fuel Pump Control Circuit CIRCUIT DESCRIPTION The fuel pump speed is controlled at two steps (high speed, low speed) by\ the condition of the engine (starting, light load
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