1991 LEXUS SC400 Service Repair Manual

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Page 2025 of 4087

LEXUS SC400 1991 Service Repair Manual 8. Care is required when pulling out and inserting wiring connectors. (a) Release the lock and pull out the connector, pulling on the connectors. (b) Fully insert the connector and check that it i

Page 2026 of 4087

LEXUS SC400 1991 Service Repair Manual FUEL SYSTEM 1. When disconnecting the high fuel pressure line, a largeamount of gasoline will spill out, so observe the following procedures: (a) Put a container under the connection. (b) Slowly l

Page 2027 of 4087

LEXUS SC400 1991 Service Repair Manual 5. Check that there are no fuel leaks after performing anymaintenance on the fuel system. (a) Using SST, connect terminals +B and FP of the check(ºDIAGNOSISº) connector. SST 09843±18020 (b) Wi

Page 2028 of 4087

LEXUS SC400 1991 Service Repair Manual FUEL SYSTEM Fuel Pump ON±VEHICLE INSPECTION 1. CHECK FUEL PUMP OPERATION(a) Using SST, connect terminals +B and FP of the check (ºDIAGNOSISº) connector. SST 09843±18020 (b) Turn the ignition s

Page 2029 of 4087

LEXUS SC400 1991 Service Repair Manual If there is no pressure, check the following parts: wFuses w EFI main relay w Fuel pump ECU w Fuel pump w Engine (& ECT) ECU w Wiring connections 2. CHECK FUEL PRESSURE (a) Check the battery voltag

Page 2030 of 4087

LEXUS SC400 1991 Service Repair Manual (h) Turn the ignition switch ON. (i) Measure the fuel pressure. Fuel pressure: 265±304 kPa (2.7±3.1 kgf/cm, 38±44 psi) If pressure is high, replace the fuel pressure regula

Page 2031 of 4087

LEXUS SC400 1991 Service Repair Manual COMPONENTS FOR REMOVAL AND INSTALLATION ± EFI SYSTEM Fuel System (Fuel Pump)FI±19 WhereEverybodyKnowsYourName

Page 2032 of 4087

LEXUS SC400 1991 Service Repair Manual REMOVAL OF FUEL PUMP (See Components on page FI±19) CAUTION: Do not smoke or work near an open flame when working on the fuel pump. 1. DISCONNECT CABLE FROM NEGATIVE TERMINAL OF BATTERY CAUTION: Tu
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