Engine Controls - Basic Diagnostic Procedures - 4-CYLINDER: Overview

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)

Connect hand-held tester to data link connector No. 3 at driver's side of instrument panel. (Scheme 1) Turn ignition on. DO NOT start engine.
Turn hand-held tester on. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, operate fuel pump. Listen for fuel pump operating sound and feel for fuel pressure in fuel inlet line at end of fuel rail. Turn ignition off. Remove hand-held tester. If fuel pump operates, check fuel pressure. See «FUEL PRESSURE»(ref-133196-S18329124162002021900000).
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-133196-S31312134322002021900000). 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.
If relays are okay, check for defective fuel pump. See «CHECKING FUEL PUMP OPERATION BY APPLYING BATTERY VOLTAGE TO FUEL PUMP (CAMRY)»(ref-133196-S10099544462001121400000) procedure. 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 (Camry Solara & Tacoma)

Connect hand-held tester to data link connector No. 3 at driver's side of instrument panel. (Scheme 2)and (Scheme 10). Turn ignition on. DO NOT start engine.
Turn hand-held tester on. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, operate 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-133196-S18329124162002021900000).
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-133196-S31312134322002021900000). 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.
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 appropriate «CHECKING FUEL PUMP OPERATION BY APPLYING BATTERY VOLTAGE TO FUEL PUMP»(ref-133196-S00255674592002021900000) procedure. 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)

WARNING

On Prius, read service precautions before proceeding with service procedure. See SERVICE PRECAUTIONS .

Connect hand-held tester to data link connector No. 3 at driver's side of instrument panel. (Scheme 3)- (Scheme 9). Turn ignition on. DO NOT start engine.
Turn hand-held tester on. Select ACTIVE TEST MODE on hand-held tester. Using hand-held tester manufacturer's instructions, operate 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-133196-S18329124162002021900000).
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-133196-S31312134322002021900000). 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.
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 appropriate «CHECKING FUEL PUMP OPERATION BY APPLYING BATTERY VOLTAGE TO FUEL PUMP»(ref-133196-S00255674592002021900000) procedure. 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 (Camry)

Note. On Camry, manufacturer lists procedure of applying battery voltage to fuel pump by removing circuit opening relay and checking fuel pump operation as well as wiring circuit to fuel pump. Also, manufacturer lists procedure for checking fuel pump operation by removing fuel pump from fuel tank and applying battery voltage directly to fuel pump. For testing of fuel pump with fuel pump removed from fuel tank, see appropriate FUEL PUMP RESISTANCE & OPERATION procedure under FUEL DELIVERY under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - 4-CYLINDER article.

Scheme 11

Scheme 11: Checking Fuel Pump Operation By Applying Battery Voltage To Fuel Pump (Camry)

Ensure ignition is off. Remove circuit opening relay from fuse/relay box. (Scheme 11) Fuse/relay box is located at driver's side front corner of engine compartment.
Install jumper wire between FP and +B terminals in fuse/relay box for circuit opening relay. Turn ignition on and listen for fuel pump operating sound. Turn ignition off. Remove jumper wire. Reinstall circuit opening relay.
If fuel pump operates, EFI main relay, wiring circuit for fuel pump and fuel pump are okay. If fuel pump does not operate with jumper wire installed, it may be necessary to check for defective fuses, fusible links, wiring or EFI main relay. See WIRING DIAGRAMS article. If necessary to check fuel pump operation, see appropriate FUEL PUMP RESISTANCE & OPERATION procedure under FUEL DELIVERY under FUEL SYSTEMS in SYSTEM & COMPONENT TESTING - 4-CYLINDER article.
If fuel pump operates with jumper wire installed but does not operate with circuit opening relay installed, circuit opening relay may be defective. For relay application and explanation of relay operation, see «FUEL PUMP CONTROL CIRCUIT»(ref-133196-S31312134322002021900000). 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. Engine Control Module (ECM) may be defective if fuel pump still fails to operate. 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 By Applying Battery Voltage To Fuel Pump (Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4 & Tacoma)

WARNING

On Prius, read service precautions before proceeding with service procedure. See SERVICE PRECAUTIONS .

On 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.
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.
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 21) For additional information on removal of luggage compartment components, see FUEL PUMP under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article.
On RAV4, remove driver's side rear seat and cover plate on floor panel for access to electrical connector for fuel pump.
On Tacoma, it may be necessary to lower fuel tank for access to electrical connector for fuel pump.
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.
Connect battery voltage to specified terminals on fuel pump to operate fuel pump. (Scheme 12)- (Scheme 20). DO NOT apply battery voltage to fuel pump for more than 10 seconds.
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-133196-S18329124162002021900000).
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 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 procedure under «FUEL PUMP OPERATION»(ref-133196-S33506992762002021900000) for additional testing information. 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.