Engine Controls - Basic Diagnostic Procedures - 4-CYLINDER: Overview Toyota Prius I рестайлинг

FUEL PUMP OPERATION

Note. Electric fuel pump operation may be checked by using Toyota hand-held tester or by applying battery voltage to the fuel pump. Fuel pump is located in the fuel tank.

Checking Fuel Pump Operation Using Toyota Hand-Held Tester (Camry Gasoline Models, Camry Solara & Tacoma)

1. Connect hand-held tester to data link connector No. 3. (Scheme 1), (Scheme 2) and (Scheme 10). Turn ignition on. DO NOT start engine.
2. Turn hand-held tester on. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, activate fuel pump. Listen for fuel pump operating sound and feel for fuel pressure in fuel inlet line at fuel filter. Turn ignition off. Remove hand-held tester. If fuel pump operates, check fuel pressure. See «FUEL PRESSURE»(ref-11449-S20915271432000111300000).
3. If fuel pump does not operate, EFI main relay or circuit opening relay may be defective. For relay application and explanation of relay operation, see «FUEL PUMP CONTROL CIRCUIT»(ref-11449-S09157101242000111300000). For testing of EFI main relay or circuit opening relay, see appropriate relay under MODULES, MOTORS, RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING - 4-CYLINDER article.
4. If relays are okay, check for defective fuses, fusible links or wiring. See WIRING DIAGRAMS article. If fuses, fusible links and wiring are okay, check for defective fuel pump. See «CHECKING FUEL PUMP OPERATION BY APPLYING BATTERY VOLTAGE TO FUEL PUMP»(ref-11449-S37826152842000111300000). If fuel pump operates properly, Engine Control Module (ECM) may be defective. NOTE: For additional testing information for fuel pump control circuit, see FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - 4-CYLINDER article.

Checking Fuel Pump Operation Using Toyota Hand-Held Tester (Celica, Corolla, ECHO, Highlander, MR2, Prius & RAV4)

1. On all models, connect hand-held tester to data link connector No. 3. (Scheme 3)- (Scheme 9). Turn ignition on. DO NOT start engine.
2. Turn hand-held tester on. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, activate fuel pump. Listen for fuel pump operating sound and feel for fuel pressure in fuel inlet pipe at end of fuel rail. Turn ignition off. Remove hand-held tester. If fuel pump operates, check fuel pressure. See «FUEL PRESSURE»(ref-11449-S20915271432000111300000).
3. If fuel pump does not operate, EFI main relay or circuit opening relay may be defective. For relay application and explanation of relay operation, see «FUEL PUMP CONTROL CIRCUIT»(ref-11449-S09157101242000111300000). For testing of EFI main relay or circuit opening relay, see appropriate relay under MODULES, MOTORS, RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING - 4-CYLINDER article.
4. If relays are okay, check for defective fuses, fusible links or wiring. See WIRING DIAGRAMS article. If fuses, fusible links and wiring are okay, check for defective fuel pump. See «CHECKING FUEL PUMP OPERATION BY APPLYING BATTERY VOLTAGE TO FUEL PUMP»(ref-11449-S37826152842000111300000). If fuel pump operates properly, Engine Control Module (ECM) may be defective. NOTE: For additional testing information for fuel pump control circuit, see FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - 4-CYLINDER article.

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Checking Fuel Pump Operation By Applying Battery Voltage To Fuel Pump

1. On Camry gasoline models, Camry Solara, Celica, Corolla, ECHO and Prius, remove rear seat cushion, cover plate on floor panel and any remaining necessary covers for access to electrical connector for fuel pump.
2. On Highlander, remove driver's side and passenger's side rear seats and cover plate on floor panel for access to electrical connector for fuel pump.
3. On MR2, remove luggage compartment lids, quarter trim covers, lower trim covers and luggage compartment boxes behind driver's and passenger's seats, and cover plate on floor panel for access to electrical connector for fuel pump. (Scheme 20) For additional information on removal of luggage compartment components, see FUEL PUMP under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article.
4. On RAV4, remove driver's side rear seat and cover plate on floor panel for access to electrical connector for fuel pump.
5. On Tacoma, it may be necessary to lower fuel tank for access to electrical connector for fuel pump.
6. On all models, disconnect electrical connector for fuel pump. This is electrical connector for fuel pump and fuel gauge sending unit and is located on top of fuel tank, near fuel pump.
7. Connect battery voltage to specified terminals on fuel pump to activate fuel pump. (Scheme 11)- (Scheme 19). DO NOT apply battery voltage to fuel pump for more than 10 seconds.
8. Listen for fuel pump operating sound. Disconnect battery voltage from fuel pump. If fuel pump operates, check fuel pressure after reinstalling components. See «FUEL PRESSURE»(ref-11449-S20915271432000111300000).
9. If fuel pump fails to operate, replace fuel pump and/or lead wire to fuel pump (if equipped). See FUEL PUMP under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - 4-CYLINDER article. On Prius, it may be necessary to replace fuel pump and fuel tank as an assembly. Consult local Toyota parts department for parts availability. On all models, if fuel pump will not operate while trying to start engine, see appropriate CHECKING FUEL PUMP OPERATION USING TOYOTA HAND-HELD TESTER under «FUEL PUMP OPERATION»(ref-11449-S20992657142000111300000) for additional testing information.

Scheme 11

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20