1991 LEXUS SC400 Service Repair Manual

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Page 1985 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 1986 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 1987 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 1988 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 1989 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

Page 1990 of 4087

LEXUS SC400 1991 Service Repair Manual B. Inspect resistance of engine & ECT ECU wiring connectorsNOTICE: Do not touch the ECU terminals. Check the resistance between each terminal of the wiring connectors.w Disconnect the SST (check harn

Page 1991 of 4087

LEXUS SC400 1991 Service Repair Manual Resistance of ECU Wiring Connectors TerminalsConditionSTD voltage (V) #10 (E10 ± 20) #20 (E10 ± 19) #30 (E10 ± 18)+ B (E9 ± 31)13 2 14 2#40 (E10 ± 17)±+ B1 (E9 ± 32) ±13.2 ± 14.2 #50 (E10 ±

Page 1992 of 4087

LEXUS SC400 1991 Service Repair Manual wDisconnect the SST from the wiring connectors. SST 09990±01000 4. REINSTALL ENGINE & ECT ECU TO FLOOR PANEL (a) Connect the two ECU connectors.w Match the male connector correctly with the femal
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