Sfi (3UZ-FE): Diagnosis Lexus GS III

INSPECTION

1. REMOVE FUEL PUMP ECU
2. INSPECT FUEL PUMP ECU (See «FUEL PUMP CONTROL CIRCUIT»(ref-229176-S13832580422006042000000) )
3. REINSTALL FUEL PUMP ECU

Scheme 87

1. REMOVE ECM
2. INSPECT ECM (See «TERMINALS OF ECM»(ref-229176-S31952948692006042000000) )
3. REINSTALL

Scheme 88

Scheme 89

1. WARM UP ENGINE Allow the engine to warm up to normal operating temperature.
2. CONNECT LEXUS HAND-HELD TESTER OR OBDII SCAN TOOL Remove the fuse cover on the instrument panel. Connect a LEXUS hand-held tester or OBDII scan tool to the DLC3. Refer to the LEXUS hand-held tester or OBDII scan tool operator's manual for further details.
3. INSPECT FUEL CUT RPM OPERATION Increase the engine speed to at least 2,500 RPM. Check for injector operating noise. Check that when the throttle lever is released, injector operation noise stops momentarily and then resumes. HINT: The vehicle should be stopped. Measure with the A/C OFF. Fuel return speed: 1,400 RPM
4. DISCONNECT LEXUS HAND-HELD TESTER OR OBDII SCAN TOOL