1991 LEXUS SC400 Service Repair Manual

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Page 3745 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 3746 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 3747 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 3748 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

Page 3749 of 4087

LEXUS SC400 1991 Service Repair Manual DIAGNOSTIC CHART Check fuel pump operation. Check for open and short in harness and connector between check connector and fuel pump ECU. Repair or replace harness or connector. Check voltage of termi

Page 3750 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG NGOK OKNG INSPECTION PROCEDURE 1Check fuel pump operation. C OK P1. Turn ignition switch ON. 2. Using SST, connect terminals +B and FP of checkconnector. SST 09843±18020 Check that there is pre

Page 3751 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK NGOK OKNG OKNG 4Check for open and short in harness and connector between terminal FP of chec\ k connector, fuel pump and body ground (See page IN±27). Repair or replace fuel pump. Repair or re

Page 3752 of 4087

LEXUS SC400 1991 Service Repair Manual 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, heavy load)
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