1991 LEXUS SC400 Service Repair Manual

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Page 2505 of 4087

LEXUS SC400 1991 Service Repair Manual (c) Install the belt hole cover with the two clips. (d) Install the rear side of the scuff. 8. REINSTALL SEAT BACK AND CUSHION 9. RECONNECT CABLE FROM NEGATIVE TERMINAL OF BATTERY FI±125 EFI SYS

Page 2506 of 4087

LEXUS SC400 1991 Service Repair Manual Engine & ECT ECU TERMINALS OF ENGINE & ECT ECU TerminalNo.SymbolConnectionTerminalNo.SymbolConnection E9 ± 1IGSWIgnition SwitchE9 ± 31+ BEFI Main Relay 2SPDNo. 1 Speed Sensor32+ B1EFI Main Relay 3K

Page 2507 of 4087

LEXUS SC400 1991 Service Repair Manual TERMINALS OF ENGINE & ECT ECU (Contd) TerminalNo.SymbolConnectionTerminalNo.SymbolConnection E10± 21NCOT/M Input Speed SensorE10 ± 51± 22±52HTL2LH Sub±Oxygen Sensor Heater 23SP2No.2 Speed Senso

Page 2508 of 4087

LEXUS SC400 1991 Service Repair Manual COMPONENTS FOR REMOVAL AND INSTALLATION INSPECTION OF ENGINE & ECT ECU 1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OFBATTERY CAUTION: Work must be started after approx. 20 se- conds or longer from th

Page 2509 of 4087

LEXUS SC400 1991 Service Repair Manual (b) Take out the front side of the floor carpet. (c) Remove the two nuts and protector. (d) Remove the nut, and disconnect the engine & ECT ECU from the floor panel. 3. INSPECT ENGINE & ECT ECU A.

Page 2510 of 4087

LEXUS SC400 1991 Service Repair Manual B. Inspect voltage of engine & ECT ECUCheck the voltage between each terminal.w Turn the ignition switch ON. w Measure the voltage at each terminal. HINT: w Perform all voltage measurements with the

Page 2511 of 4087

LEXUS SC400 1991 Service Repair Manual Voltage at Engine (& ECT) ECU Wiring Connectors TerminalsConditionSTD voltage (V) BATT (E9 ± 33) ± E1 (E10 ± 69)±10 ± 14 IGSW (E9 ± 1) +B (E9 ± 31) ± E1 (E10 ± 69)IG SW ON10 ± 14 +B1 (E9 ±

Page 2512 of 4087

LEXUS SC400 1991 Service Repair Manual Voltage at Engine (& ECT) ECU Wiring Connectors (Contd) TerminalsConditionSTD voltage (V) ISC1 (E10 ± 35) ISC2 (E10 ± 34)E1 (E10 69)IG SW ON10 14ISC3 (E10 ± 33)± E1 (E10 ± 69)IG SW ON10 ± 14 I
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