1991 LEXUS SC400 Service Repair Manual

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Page 3537 of 4087

LEXUS SC400 1991 Service Repair Manual DIAGNOSTIC CHART Check fuel pump operation. Check for open and short in harness and connector between check connector and fuel pump ECU. Repair or replace harness or connector. Check voltage of termi

Page 3538 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG NGOK OKNG INSPECTION PROCEDURE 1Check fuel pump operation. C OK P1. Turn ignition switch ON. 2. Using SST, connect terminals +B and FP of checkconnector. SST 09843±18020 Check that there is pre

Page 3539 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK NGOK OKNG OKNG 4Check for open and short in harness and connector between terminal FP of chec\ k connector, fuel pump and body ground (See page IN±27). Repair or replace fuel pump. Repair or re

Page 3540 of 4087

LEXUS SC400 1991 Service Repair Manual Diag. Code 78Fuel Pump Control Circuit CIRCUIT DESCRIPTION The fuel pump speed is controlled at two steps (high speed, low speed) by\ the condition of the engine (starting, light load, heavy load)

Page 3541 of 4087

LEXUS SC400 1991 Service Repair Manual DIAGNOSTIC CHART DIAGNOSTIC CHART Check for open and short in harness and connector between check connector and fuel pump. Check voltage of terminal FPC.Check for open and short in harness and conne

Page 3542 of 4087

LEXUS SC400 1991 Service Repair Manual OKNG NGOK OKNG INSPECTION PROCEDURE 1Check fuel pump operation. C OK P(2) Turn ignition switch ON. (2) Using SST. connect terminals + B and FP of checkconnector. SST 09843±18020 Check that there is

Page 3543 of 4087

LEXUS SC400 1991 Service Repair Manual NGOK NGOK OKNG OKNG 4Check for open and short in harness and connector between terminal FP of chec\ k connector, fuel pump and body ground (See page IN±27). Repair or replace fuel pump. Repair or re

Page 3544 of 4087

LEXUS SC400 1991 Service Repair Manual Diag. Code 51Switch Condition Signal Circuit CIRCUIT DESCRIPTION Neutral Start Switch Signal The ECU uses the signals from the neutral start switch to determine whether\ the transmission is in park
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