Toyota 4A-FE - EFI System; System Description

EFI SYSTEM
Page
SYSTEM DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . Fl-2
PRECAUTIONS . . . . . . .. . .. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .. . . . .. . Fl-8
INSPECTION PRECAUTIONS . . . .. . .. . .. ... .. . .. . .. .. . .. . . Fl-8
TROUBLESHOOTING ...... ... ................. ....... ....... Fl-14
DIAGNOSIS SYSTEM . . . . . . .. .. . .. . .. . . . .. . . . . .. . . . . .. .. . .. . . Fl-25
TROUBLESHOOTING WITH VOLT/OHMMETER .. . Fl-34
FUEL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . Fl-94
Fuel Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fl-94
Cold Start Injector .................................. I...... Fl-105
Fuel Pressure Regulator . . . .. .. .. . .. . .. . . . . .. .. . .. .. . .. .. Fl-109
Injectors ....................................................... Fl-111
AIR INDUCTION SYSTEM .................................. Fl-120
Air Flow Meter (w/ Air Flow Meter) . .. .. ... . .. .. .. . Fl-120
Throttle Body (4A-FE) .. . . . . . . . . .. . . .. .. . .. .. . . .. . . . .. . . . . Fl-122
Auxiliary Air Valve . .. ... .. . .. .. .. . .. .. . .. ... .. .. . . . .... . .. Fl-131
ELECTRONIC CONTROL SYSTEM ...................... Fl-133
Location of Electronic Control Parts .. . .. .. . ......... Fl-133
EFI Main Relay .............................................. Fl-134
Circuit Opening Relay . . . .. .. . . .. . . . . . . . . . . . . . .. . . .. .. . . .. . Fl-135
Start Injector Time Switch . .. . .. . .. .. . .. . . .. .. . . . .. . .. . Fl-137
Water Temperature Sensor ........ .................... Fl-138
Intake Air Temperature Sensor
(w/o Air Flow Meter) ... . . . . . .. . . . ... . . .. .. .. . .. . . .. . .. . . . Fl-139
Vacuum Sensor (w/o Air Flow Meter)
(Manifold Absolute Pressure Sensor) . . . . . . . . . . . . . . . Fl-140
Variable Resistor (w/o TWC) .......................... Fl-142
Oxygen Sensor (w/ TWC) ......................... ...... Fl-145
Engine ECU ................................................... Fl-147
Fuel Cut RPM ..... ........................................... Fl-153
Fuel Pressure Control System (4A-GE Europ .e) .. Fl-154
Idle-up System (w/ Air Flow Meter) ................. Fl-156
Idle Speed Control (ISC) Valve
(4A-FE) . . . . .. . .. . . . .. . . . . . .. . . . .. . . . . . . . . . . .. .. . . . .. .. . . . . . . . . . . Fl-158
Fl-1