1991 LEXUS SC400 Service Repair Manual

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Page 2497 of 4087

LEXUS SC400 1991 Service Repair Manual Sub±Oxygen Sensors COMPONENTS FOR REMOVAL AND INSTALLATION FI±117 ± Electronic Control System (Sub±Oxygen\ Sensors)EFI SYSTEM WhereEverybodyKnowsYourName

Page 2498 of 4087

LEXUS SC400 1991 Service Repair Manual INSPECTION OF SUB±OXYGEN SENSORS 1. INSPECT SUB±OXYGEN SENSORS(a) Cancel diagnostic code. (See TR section) (b) A llo w th e en g in e to wa rm up to no rma l op e ra tin gtemperature. (c) Drive

Page 2499 of 4087

LEXUS SC400 1991 Service Repair Manual 4. REMOVE CUP HOLDERUsing a screwdriver, pry out the rear side of the cup holder. Remove the cup holder. 5. REMOVE UPPER REAR CONSOLE PANEL Using a screwdriver, pry out the console panel. 6. REMOV

Page 2500 of 4087

LEXUS SC400 1991 Service Repair Manual 9. INSPECT HEATER RESISTANCE OF SUB±OXYGEN SENSORS Using an ohmmeter, measure the resistance between the ter- minals +B and HT. Resistance: 5.1±6.3  at 20 °C (68 °F) If the resistance is not a

Page 2501 of 4087

LEXUS SC400 1991 Service Repair Manual 13. REINSTALL UPPER CONSOLE PANELFit the console panel to the console box with the four clips. 14. REINSTALL CUP HOLDER Fit the cup holder to the console box. 15. REINSTALL TRANSMISSION SHIFT LEVE

Page 2502 of 4087

LEXUS SC400 1991 Service Repair Manual Fuel pump ECU COMPONENTS FOR REMOVAL AND INSTALLATION FI±122 ± Electronic Contro\ l System (Fuel Pump ECU)EFI SYSTEM WhereEverybodyKnowsYourName

Page 2503 of 4087

LEXUS SC400 1991 Service Repair Manual INSPECTION OF FUEL PUMP ECU 1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OFBATTERY CAUTION: Work must be started after approx. 20 se- conds or longer from the time the ignition switch is turned to th

Page 2504 of 4087

LEXUS SC400 1991 Service Repair Manual 5. INSPECT FUEL PUMP ECU(a) Connect the cable to the negative (±) terminal of thebattery. (b) Check the connector on the wiring harness side as shown in the chart. Check forTester connectionCond
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