1991 LEXUS SC400 Service Repair Manual

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Page 1969 of 4087

LEXUS SC400 1991 Service Repair Manual Warm up the oxygen sensors with the engine at 2,500 rpm for approx. 120 seconds. Connect terminals TE1 and E1 of the check connector. And maintain engine at 2,500 rpm. Check the number of times the v

Page 1970 of 4087

LEXUS SC400 1991 Service Repair Manual Disconnect terminals TE1 and E1 of the check connector. And maintain engine at 2,500 rpm. Repair (Over rich) Replace the oxygen sensor.Repair (Over rich) Measure voltage between terminals VF1 (VF2) a

Page 1971 of 4087

LEXUS SC400 1991 Service Repair Manual 3. 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 the ºLOCKº position and the

Page 1972 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 1973 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 1974 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 1975 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 1976 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
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