Application

Location

2001 ENGINE PERFORMANCE Theory & Operation

Avalon

In Fuse/Relay Box At Driver's Side Front Corner Of Engine

Compartment, Near Battery

Camry & Camry Solara

In Small Fuse/Relay Box At Driver's Side Front Corner Of Engine

Compartment, In Front Of Battery

Highlander

In Fuse/Relay Box At Driver's Side Front Corner Of Engine Compartment, Just In Front Of Strut Tower

RAV4

In Fuse/Relay Box At Driver's Side Front Corner Of Engine

Compartment

Sienna

(1)

(l) Located near ECM behind passenger's side of instrument panel and contains a 4-pin connector. See Fig. 50 .

Circuit Opening Relay (Avalon)

Circuit Opening Relay (Avalon)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied from ignition switch to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table. Circuit opening relay may also be identified by appropriate illustration in appropriate SYSTEM & COMPONENT TESTING article.

Circuit Opening Relay (Camry 2.2L 4-Cyl. CNG Models)

Circuit opening relay controls fuel supply circuit. When EFI main relay is energized, EFI main relay provides battery voltage to both sides of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel tank fuel shutoff valve and fuel pressure regulator fuel shutoff valve. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table. Circuit opening relay may also be identified by appropriate illustration in appropriate SYSTEM & COMPONENT TESTING article.

Circuit Opening Relay (Camry 2.2L 4-Cyl. Gasoline Models, Camry 3.0L V6, Camry Solara & Highlander)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied through IGN fuse to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table. Circuit opening relay may also be identified by appropriate illustration in appropriate SYSTEM & COMPONENT TESTING article.

Circuit Opening Relay (Celica, ECHO & Prius)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to both sides of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then

2001 ENGINE PERFORMANCE Theory & Operation provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table. Circuit opening relay may also be identified by appropriate illustration in appropriate SYSTEM & COMPONENT TESTING article.

Circuit Opening Relay (Corolla)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to both sides of circuit opening relay. EFI main relay may also be referred to as EFI relay or F-HTR relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table. Circuit opening relay may also be identified by appropriate illustration in appropriate SYSTEM & COMPONENT TESTING article.

Circuit Opening Relay (MR2)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied from ignition switch to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table.

Circuit Opening Relay (RAV4)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied to other side of circuit opening relay from IG2 fuse. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table. Circuit opening relay may also be identified by appropriate illustration in appropriate SYSTEM & COMPONENT TESTING article.

Circuit Opening Relay (Sequoia)

Circuit opening relay controls fuel pump circuit by supplying voltage to fuel pump relay. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied through IGN1 fuse to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump relay which supplies voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table. For operation of fuel pump relay, see FUEL PUMP RELAY & FUEL PUMP RESISTOR (SEQUOIA & TUNDRA 4.7L V8) .

Circuit Opening Relay (Sienna)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied through IGN fuse to other

2001 ENGINE PERFORMANCE Theory & Operation side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table. Circuit opening relay may also be identified by appropriate illustration in appropriate SYSTEM & COMPONENT TESTING article.

Circuit Opening Relay (Tacoma & Tundra 3.4L V6)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to both sides of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table. Circuit opening relay may also be identified by appropriate illustration in appropriate SYSTEM & COMPONENT TESTING article

Circuit Opening Relay (Tundra 4.7L V8)

Circuit opening relay controls fuel pump circuit by supplying voltage to fuel pump relay. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied through IGN fuse to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump relay which supplies voltage for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table. Circuit opening relay may also be identified by appropriate illustration in appropriate SYSTEM & COMPONENT TESTING article. For operation of fuel pump relay, see FUEL PUMP RELAY & FUEL PUMP RESISTOR (SEQUOIA & TUNDRA 4.7L V8) .

Circuit Opening Relay (4Runner)

Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, it provides battery voltage to one side of circuit opening relay. When ignition is turned on, voltage is supplied through IGN fuse to other side of circuit opening relay. When proper input signals are delivered to Engine Control Module (ECM), circuit opening relay ground circuit is grounded at ECM terminal FC. Circuit opening relay then provides voltage to fuel pump for fuel pump operation. For circuit opening relay location, see CIRCUIT OPENING RELAY LOCATION table. Circuit opening relay may also be identified by appropriate illustration in appropriate SYSTEM & COMPONENT TESTING article.

CIRCUIT OPENING RELAY LOCATION (1)

Application

Location

Avalon

Top Corner Of Relay Box Behind Driver's Side Kick Panel

Camry CNG & Gasoline Models, & Camry Solara

In Fuse/Relay Box At Driver's Side Front Corner Of Engine

Compartment, Near Battery

Celica

In Fuse/Relay Box At Driver's Side Front Corner Of Engine Compartment, Just In Front Of Strut Tower

Corolla

Center Relay In Relay Box Behind Driver's Side Kick Panel

ECHO

In Fuse/Relay Box Behind Driver's Side Of Instrument Panel

2001 ENGINE PERFORMANCE Theory & Operation

Highlander

In Relay Box Just Above Driver's Side Kick Panel

MR2

In Relay Box On Firewall At Driver's Side Front Corner Of Engine

Compartment

Prius & RAV4

In Fuse/Relay Box At Driver's Side Front Corner Of Engine

Compartment

Sequoia

In Fuse/Relay Box At Driver's Side Front Corner Of Engine

Compartment, Next To Battery

Sienna

In Fuse/Relay Box At Driver's Side Front Corner Of Engine

Compartment, Near Battery

Tacoma

Behind Lower Instrument Panel Cover, Next To Driver's Side Of

Steering Column

Tundra

In Fuse/Relay Box At Driver's Side Front Corner Of Engine

Compartment, Next To Battery

4Runner

Below Right Corner Of Fuse/Relay Box, Behind Lower Instrument Panel Cover At Driver's Side Of Instrument Panel To Left Of Steering Column, Just Above Hood Release Lever

(1) Circuit opening relay may be marked as CIR OPN relay.

EFI Main Relay (Avalon)

EFI Main Relay (Avalon)

EFI main relay may also be referred to as EFI relay. EFI No. 1 fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, EFI No. 2 fuse, +B terminal of ECM, DLC terminal No. 1 and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Camry 2.2L 4-Cyl. CNG Models)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM, DLC terminal No. 1 and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Camry 2.2L 4-Cyl. Gasoline Models & Camry Solara 2.2L 4-Cyl.)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized when ignition is turned on by voltage supplied through IGN fuse to EFI main relay on vehicles not equipped with engine immobilizer system, or by MREL terminal of Engine Control Module (ECM) on vehicles equipped with engine immobilizer system. When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM, DLC terminal No. 1 and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Camry 3.0L V6 & Camry Solara 3.0L V6)

2001 ENGINE PERFORMANCE Theory & Operation

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM, DLC terminal No. 1 and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Celica)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM, EFI No. 1 and 2 fuses, and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Corolla)

EFI main relay may also be referred to as EFI relay or F-HTR relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI fuse may also be referred to as F-HTR fuse. When ignition is turned on, voltage is supplied through IGN fuse to other side of EFI main relay. EFI main relay is then energized and provides battery voltage to circuit opening relay, +B terminal of Engine Control Module (ECM), DLC terminal No. 1 and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (ECHO)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. When ignition is turned on, voltage is supplied to other side of EFI main relay. EFI main relay is then energized and provides battery voltage to circuit opening relay, +B terminal of Engine Control Module (ECM) and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Highlander)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to +B terminal of ECM, circuit opening relay and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Land Cruiser)

EFI main relay may also be referred to as EFI relay or ECD relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI fuse may also be referred to as ECD fuse. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to +B terminal of fuel pump Electronic Control Unit (ECU), +B and +B1 terminals of ECM and various other electrical components. For operation of fuel pump ECU and fuel pump switch, see FUEL PUMP ELECTRONIC CONTROL UNIT & fUeL PUMP SWITCH (LAND CRUISER) . For EFI main relay location, see EFI MAIN RELAY LOCATION table.

2001 ENGINE PERFORMANCE Theory & Operation

EFI Main Relay (MR2)

EFI main relay may also be referred to as EFI relay. EFI No. 1 fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Prius)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (RAV4)

EFI main relay may also be referred to as EFI relay. EFI No. 2 fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, A/F heater relay, +B terminal of ECM and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Sequoia)

EFI main relay may also be referred to as EFI relay. EFI No. 1 fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to +B and +B1 terminals of ECM, circuit opening relay, EFI No. 2 fuse and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Sienna)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM, DLC terminal No. 1 and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Tacoma 2.4L 4-Cyl. & 2.7L 4-Cyl.)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. When ignition is turned on, voltage is supplied through IGN fuse to other side of EFI main relay. EFI main relay is then energized and provides battery voltage to circuit opening relay, +B terminal of Engine Control Module (ECM), DLC terminal No. 1 and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

2001 ENGINE PERFORMANCE Theory & Operation

EFI Main Relay (Tacoma 3.4L V6)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM, DLC terminal No. 1 and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Tundra 3.4L V6)

EFI main relay may also be referred to as EFI relay. EFI No. 1 fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (Tundra 4.7L V8)

EFI main relay may also be referred to as EFI relay. EFI fuse No. 1 supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B and +B1 terminals of ECM, EFI fuse No. 2 and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI Main Relay (4Runner)

EFI main relay may also be referred to as EFI relay. EFI fuse supplies constant battery voltage to one side of EFI main relay. EFI main relay is energized by MREL terminal of Engine Control Module (ECM). When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay, +B terminal of ECM, DLC terminal No. 1 and various other electrical components. For EFI main relay location, see EFI MAIN RELAY LOCATION table.

EFI MAIN RELAY LOCATION

Application

Location

Avalon, Camry CNG & Gasoline Models, & Camry Solara

In Fuse/Relay Box At Driver's Side Front Corner Of Engine

Compartment, Near Battery

Celica, Corolla, ECHO & Highlander

In Fuse/Relay Box At Driver's Side Front Corner Of Engine Compartment, Just In Front Of Strut Tower

Land Cruiser

In Fuse/Relay Box At Driver's Side Front Corner Of Engine

Compartment, Near Battery

MR2

In Relay Box On Firewall At Driver's Side Front Corner Of

Engine Compartment

Prius & RAV4

In Fuse/Relay Box At Driver's Side Front Corner Of Engine

Compartment

Sequoia

In Fuse/Relay Box At Driver's Side Front Corner Of Engine

Compartment, Next To Battery

2001 ENGINE PERFORMANCE Theory & Operation

Sienna

In Fuse/Relay Box At Driver's Side Front Corner Of Engine

Compartment, Near Battery

Tacoma, Tundra & 4Runner

In Fuse/Relay Box At Driver's Side Front Corner Of Engine

Compartment, Next To Battery

Fuel Manual Shutoff Valve & Fuel Filter Assembly (Camry 2.2L 4-Cyl. CNG Models)

Fuel Manual Shutoff Valve & Fuel Filter Assembly (Camry 2.2L 4-Cyl. CNG Models)

Fuel manual shutoff valve can be used to shut off fuel supply from the fuel tank if a gas leak exists or when performing service procedures. Fuel manual shutoff valve is located near driver's side rear tire, underneath the vehicle, near fuel lines just below fuel tank, behind the rear seat. See Fig. 51 . Rotating handle on fuel manual shutoff valve clockwise 90 degrees will close the valve and rotating the handle counterclockwise 90 degrees will open the valve.

Fuel filter assembly for CNG system is located below vehicle floor, next to fuel manual shutoff valve. See Fig. 51 . Fuel filter assembly consists of a fuel filter body, fuel filter housing, fuel filter element and drain plug. See Fig. 51 . Fuel filter element is located inside fuel filter housing and can be changed. Drain plug may be removed to allow water and oil to be drained from fuel filter assembly.

2001 Toyota Celica Fuel Filter Location

Fig. 51: Locating Fuel Manual Shutoff Valve, Fuel Filter Assembly & Drain Plug (Camry 2.2L 4-Cyl. CNG Models)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 51: Locating Fuel Manual Shutoff Valve, Fuel Filter Assembly & Drain Plug (Camry 2.2L 4-Cyl. CNG Models)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fuel Pump (Avalon, Camry 2.2L 4-Cyl. Gasoline Models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 & 4Runner)

Electric fuel pump is mounted in fuel tank. Fuel pump operates at one specified speed.

2001 ENGINE PERFORMANCE Theory & Operation

Fuel Pump (Land Cruiser)

Electric fuel pump is mounted in fuel tank. Fuel pump operating speed is varied by use of fuel pump Electronic Control Unit (ECU). For additional information, see FUEL PUMP ELECTRONIC CONTROL UNIT & FUEL PUMP SWITCH (LAND CRUISER) .

Fuel Pump (Sequoia & Tundra 4.7L V8)

Electric fuel pump is mounted in fuel tank. Fuel pump operating speed is controlled by operating condition of the engine such as: starting, idling, light load or heavy load. This is accomplished by use of fuel pump resistor and fuel pump relay. For operation of fuel pump relay and fuel pump resistor, see FUEL PUMP RELAY & FUEL PUMP RESISTOR (SEQUOIA & TUNDRA 4.7L V8) .

Fuel Pump Electronic Control Unit & Fuel Pump Switch (Land Cruiser)

Fuel pump operating speed is controlled by engine operating conditions such as: starting, idling, light load or heavy load. Engine Control Module (ECM) delivers an input signal from FPC terminal on ECM to FPC terminal on fuel pump Electronic Control Unit (ECU) in accordance with engine operating condition. Fuel pump ECU uses this input signal to determine how much voltage should be delivered to fuel pump for varying fuel pump operating speed. When engine starts, or engine is under heavy load at high speeds, ECM delivers input signal of approximately 3.8 volts to fuel pump ECU. Fuel pump ECU then delivers approximately battery voltage to fuel pump and fuel pump operates at high speed. When engine is under heavy load at low speeds, ECM delivers an input signal of approximately 2.5 volts to fuel pump ECU. Fuel pump ECU then delivers approximately 10 volts to fuel pump and fuel pump operates at medium speed. When engine is idling or under light loads, ECM delivers an input signal of approximately 1.3 volts to fuel pump ECU. Fuel pump ECU then delivers approximately 8.5 volts to fuel pump and fuel pump operates at low speed. If a problem exists in fuel pump ECU or control circuit, Diagnostic Trouble Code (DTC) P1200 may be stored in ECM. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieval of DTCs. Fuel pump ECU is located behind inner panel, just behind driver's rear wheelwell. See Fig. 52 .

Fuel pump switch is in the circuit between FPC terminal on ECM and FPC terminal on fuel pump ECU. Fuel pump switch may also be referred to as fuel pump inertia switch or fuel pump control switch. If vehicle is involved in a collision, fuel pump switch will shut off the fuel pump by opening this circuit, and not allowing any input signal to be delivered from ECM to fuel pump ECU. Fuel pump switch is located on driver's side of instrument panel. See Fig. 53 . Fuel pump switch contains a reset switch which has an OFF and ON position. See Fig. 53 . Continuity will exist between electrical terminals on fuel pump switch with reset switch in the ON position and no continuity in the OFF position. Reset switch must be in ON position for fuel pump operation.

2001 ENGINE PERFORMANCE Theory & Operation

Inertia Switch 2004 Toyota Camry

G98B01613

Fig. 52: Locating Fuel Pump Electronic Control Unit (Land Cruiser) Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2001 ENGINE PERFORMANCE Theory & Operation

Land Cruiser Engine 2002 Photos
Fig. 53: Locating Fuel Pump Switch & Identifying Reset Switch Positions (Land Cruiser) Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fuel Pump Relay & Fuel Pump Resistor (Sequoia & Tundra 4.7L V8)

Fuel pump operating speed is controlled by operating condition of the engine such as; starting, idling, light load or heavy load. When engine is cranking and start signal is received at Engine Control Module (ECM), the ECM energizes circuit opening relay and voltage is applied to both sides of fuel pump relay. Fuel pump relay contacts are closed on one side and voltage is applied directly to fuel pump in which fuel pump operates at high speed.

2001 ENGINE PERFORMANCE Theory & Operation

After engine starts during idling or light loads, fuel pump relay is energized by FPR terminal of ECM and contacts in fuel pump relay close to other side of relay. Voltage is then supplied to fuel pump by going from fuel pump relay through fuel pump resistor. Fuel pump now operates at low speed. Fuel pump relay is located in fuse/relay box at driver's side front corner of engine compartment, next to battery. Fuel pump resistor is located at driver's side front corner of engine compartment, near end of fuse/relay box. See Fig. 54 .

Tundra Relaybox
Fig. 54: Locating Fuel Pump Resistor (Sequoia & Tundra 4.7L V8) Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fuel Pressure Regulator (Avalon, Camry 2.2L 4-Cyl. Gasoline Models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4 & Sienna)

Fuel system is a returnless type system with fuel pressure regulator mounted on the fuel pump in the fuel tank. Fuel pressure regulator maintains constant fuel pressure to the fuel injectors.

Fuel Pressure Regulator (Camry 2.2L 4-Cyl. CNG Models)

Fuel pressure regulator is used to regulate fuel pressure from fuel tank to the fuel injectors at 114 psi (8.0 kg/cm2 ). Fuel pressure regulator is located in fuel line between fuel tank and fuel rail, just below brake booster. See Fig. 44 . An oil separator is used to trap moisture and oil in the fuel on low-pressure side of the fuel system between fuel pressure regulator and fuel rail. Oil separator is located on bottom of fuel pressure regulator. See

2001 ENGINE PERFORMANCE Theory & Operation

Fig. 44 . A relief valve is incorporated into fuel pressure regulator and is used to protect fuel system components on low-pressure side of the system between fuel pressure regulator and fuel rail.

Fuel pressure regulator contains a coolant passage which allows engine coolant to flow through the fuel pressure regulator. Engine coolant is used to warm fuel pressure regulator to prevent damage to any rubber components, as fuel pressure regulator becomes excessively cold while reducing the fuel pressure.

Fuel Pressure Regulator (Land Cruiser, Sequoia, Tacoma, Tundra & 4Runner)

Fuel pressure regulator is mounted on the fuel rail and maintains constant fuel pressure to fuel injectors. Fuel Pressure Regulator Fuel Shutoff Valve (Camry 2.2L 4-Cyl. CNG Models)

Fuel pressure regulator fuel shutoff valve is controlled by Engine Control Module (ECM). ECM uses fuel pressure regulator fuel shutoff valve to shut off fuel supply at fuel inlet side of fuel pressure regulator when ignition is off, engine stalls, air bag is deployed, or fuel pressure in the fuel pipe becomes abnormally low. Fuel pressure regulator fuel shutoff valve may also be referred to as fuel shutoff valve (fuel pressure regulator). Fuel pressure regulator fuel shutoff valve is located on fuel pressure regulator, which is located in fuel line between fuel tank and fuel rail, just below brake booster. See Fig. 44 .

Fuel Rail Fuel Shutoff Valve (Camry 2.2L 4-Cyl. CNG Models)

Fuel rail fuel shutoff valve is controlled by Engine Control Module (ECM). ECM uses fuel rail fuel shutoff valve to shut off fuel supply at fuel rail when ignition is off, engine stalls, air bag is deployed, or fuel pressure in the fuel pipe becomes abnormally low. Fuel rail fuel shutoff valve may also be referred to as delivery pipe fuel shutoff valve or fuel shutoff valve (delivery pipe). Fuel rail fuel shutoff valve is located at end of fuel rail at flywheel end of engine and contains a Blue 2-pin electrical connector.

Fuel Tank Fuel Shutoff Valve (Camry 2.2L 4-Cyl. CNG Models)

Fuel tank fuel shutoff valve is controlled by Engine Control Module (ECM). ECM uses fuel tank fuel shutoff valve to shut off fuel supply at fuel tank when ignition is off, engine stalls, air bag is deployed, or fuel pressure in the fuel pipe becomes abnormally low. Fuel tank fuel shutoff valve may also be referred to as shutoff valve (fuel tank). Fuel tank fuel shutoff valve is located on fuel tank valve assembly at end of fuel tank behind the rear seat. See Fig. 45 .

Fuel Tank Valve Assembly (Camry 2.2L 4-Cyl. CNG Models)

Fuel tank valve assembly is located at end of fuel tank behind rear seat. See Fig. 45 . Fuel tank valve assembly contains fuel tank fuel shutoff valve, inlet check valve and relief valve.

Inlet check valve is used to prevent fuel leakage and is connected to the filler pipe. Inlet check valve remains closed by spring pressure and pressure of the gas in the fuel tank. When filling fuel tank, inlet check valve opens by pressure of incoming gas, then closes when filling is complete.

Relief valve is used to prevent damage to fuel tank by releasing excessive fuel pressure from fuel tank when fuel tank is exposed to abnormally hot temperatures. When fuel tank is exposed to abnormally hot temperatures, relief valve opens at specified temperature by melting, allowing excessive fuel pressure to be released by

2001 ENGINE PERFORMANCE Theory & Operation discharging gas through vent tube to the outside of the vehicle to prevent fuel tank from bursting.

IG2 Relay (Avalon, Celica, MR2, Prius & RAV4)

See IG2 RELAY under MISCELLANEOUS CONTROLS.

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Responses

  • gloria
    Where is located fuel filter toyota rav4 2001?
    8 years ago
  • Maximilian
    Where is highlander "circuit opening relay"?
    8 years ago
  • Shona Bruce
    Where is the fuel filter on a 2001 tacoma 4 cyl?
    8 years ago
  • berylla sackville-baggins
    Where is the fuel pump resistor located on a toyota sienna?
    7 years ago
  • marmaduke
    Where is the gas pump on a 2007 toyota camry?
    7 years ago
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