1991 LEXUS SC400 Service Repair Manual

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Page 1105 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK OKNG INSPECTION PROCEDURE 1Check voltage between terminals PR and E2 of ABS & TRAC ECU connector. C OK P C Notice 1. Remove ABS & TRAC ECU with connectors stillconnected. 2. Operate the engine f

Page 1106 of 4087

LEXUS SC400 1991 Service Repair Manual ±MEMO± ± BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±137 WhereEverybodyKnowsYourName

Page 1107 of 4087

LEXUS SC400 1991 Service Repair Manual WIRING DIAGRAM DTC61TRAC ECU Communication Circuit Malfunc- tion. CIRCUIT DESCRIPTION DTC No.DTC Detecting ConditionTrouble Area 61 Either of the following (1) or (2) continues for more than 8 sec.:

Page 1108 of 4087

LEXUS SC400 1991 Service Repair Manual OKOK OKNG OKNG INSPECTION PROCEDURE 1Check voltage between terminals THFA, TRCO of ABS & TRAC ECU and body ground. C OK PRemove ABS & TRAC ECU with connectors still con- nected. Measure voltage betwe

Page 1109 of 4087

LEXUS SC400 1991 Service Repair Manual DTC62TRAC Vehicle Speed Malfunction CIRCUIT DESCRIPTION DTC No.DTC Detecting ConditionTrouble Area 62 Detection of any of conditions (1) through (3):At vehicle speed of 10 km/h (6 mph) or more, pulse

Page 1110 of 4087

LEXUS SC400 1991 Service Repair Manual ±MEMO± ± BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±141 WhereEverybodyKnowsYourName

Page 1111 of 4087

LEXUS SC400 1991 Service Repair Manual BE±78). BR±74 ). IN±33 ). WIRING DIAGRAM Stop Light Switch Circuit CIRCUIT DESCRIPTION The stop light switch senses whether the brake pedal is depressed or releas\ ed, and sends a signal to the EC

Page 1112 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG NGOK OKNG INSPECTION PROCEDURE 1Check operation of stop light. Check that stop light lights up when brake pedal is depressed and turns off when brake pedal is re- leased.C Repair stop light circ
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