Home ReviewsRefund
Home/Toyota/Avalon/Toyota Avalon XX20 (1999-2002)/Repair manual/Testing & Diagnostics/Engine Controls - System & Component Testing - V6 & V8: Ove…
Contents Wiring diagrams Section: Testing & Diagnostics All sections

Engine Controls - System & Component Testing - V6 & V8: Overview Toyota Avalon XX20

Testing & Diagnostics 12 illustrations ~3174 words

Fuel Pump Resistance & Operation (Avalon, Camry, Camry Solara, Land Cruiser, Sienna, Tacoma & 4Runner)

  1. On Avalon, Camry and Camry Solara, remove rear seat and cover plate on floor panel and remaining necessary covers for access to electrical connector for fuel pump for access to electrical connector at fuel pump.
  2. On Land Cruiser, remove rear seat located above the fuel tank. Remove rear door scuff plates, step plates and rear seat lock covers so carpet may be folded backward for access to top of fuel tank. Remove cover plate on floor panel for access to electrical connector at fuel pump.
  3. On Sienna, manufacturer recommends removing fuel tank for access to fuel pump. On Tacoma and 4Runner, it may be necessary to lower fuel tank for access to electrical connector at fuel pump.
  4. 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. To test fuel pump resistance, using ohmmeter, check resistance between specified terminals on fuel pump electrical connector. (Scheme 56)- (Scheme 60). Replace fuel pump and/or lead wire (if equipped) if resistance is not.20-3.00 ohms at 68°F (20°C).
  5. To test fuel pump operation, apply battery voltage and ground to (+) and (-) terminals on electrical connector for fuel pump. (Scheme 56)- (Scheme 60). DO NOT apply battery voltage to fuel pump for more than 10 seconds. Replace fuel pump and/or lead wire (if equipped) if fuel pump does not operate.

Scheme 56

Scheme 56
Scheme 56

Scheme 57

Scheme 57
Scheme 57

Scheme 58

Scheme 58
Scheme 58

Scheme 59

Scheme 59
Scheme 59

Scheme 60

Scheme 60
Scheme 60

Fuel Pump Resistance & Operation (Tundra)

  1. Manufacturer lists checking fuel pump resistance and operation with fuel pump removed from fuel tank and fuel pump mounting bracket. For removal of fuel pump from fuel tank and fuel pump mounting bracket, see FUEL PUMP under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article.
  2. To test fuel pump resistance, using ohmmeter, check resistance between electrical terminals on fuel pump. (Scheme 61) Replace fuel pump if resistance is not.20-3.00 ohms at 68°F (20°C).
  3. To test fuel pump operation, reinstall lead wire on fuel pump. Apply battery voltage and ground to terminals on lead wire. (Scheme 61) DO NOT apply battery voltage to fuel pump for more than 10 seconds. Replace fuel pump and/or lead wire if fuel pump does not operate.

Scheme 61

Scheme 61: Fuel Injectors (Avalon, Camry & Camry Solara)
Scheme 61: Fuel Injectors (Avalon, Camry & Camry Solara)

Scheme 62

Scheme 62
Scheme 62
  1. To check for injector operation, remove "V" bank cover on top of engine for access to fuel injectors. see scheme 4and see scheme 5. Using stethoscope, listen for clicking sound at each fuel injector or use your finger to feel for fuel injector operation at fuel injector with engine cranking or with engine running. If fuel injector operation does not exist, check for loose connection at fuel injector electrical connector. If fuel injector electrical connector is okay, go to next step.
  2. Ensure ignition is off. Disconnect electrical connector at fuel injector. Using ohmmeter, check resistance between electrical terminals on fuel injector. Replace fuel injector if resistance is not 13.4-14.2 ohms at 68°F (20°C).
  3. If fuel injector operates and fuel injector resistance is within specification, go to next step. If fuel injector resistance is within specification but fuel injector does not operate, check wiring circuit to fuel injector. See appropriate wiring diagram in WIRING DIAGRAMS article. If problem exists in fuel injector or wiring circuit and misfire exists, a Diagnostic Trouble Code (DTC) may be stored in Engine Control Module (ECM). See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  4. To check fuel injector volume, remove fuel injector. See FUEL RAILS & FUEL INJECTORS under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Fuel injector is connected to fuel filter for checking fuel injector volume.
  5. Remove fuel pipe clamp from No. 1 fuel pipe at fuel filter. Perform STEP 1 in illustration. (Scheme 62) Ensure area around No. 1 fuel pipe and fuel filter is clean.
  6. Depress both sides of retainer and pull No. 1 fuel pipe with disconnect fitting from fuel filter. Perform STEP 2 in illustration. (Scheme 62)
  7. On Avalon, purchase No. 1 fuel pipe Part No. (23801-20070) from parts department. On Camry and Camry Solara, purchase No. 1 fuel pipe Part No. (23801-20041) from parts department. On all models, No. 1 fuel pipe is the fuel pipe that attaches to top of fuel filter. Remove fuel pipe connector from end of NEW No. 1 fuel pipe. (Scheme 63)
  8. Install delivery hose from Fuel Injector Measuring Kit (SST 09268-41047) with fuel pipe connector on fuel filter. (Scheme 63) Ensure delivery hose and fuel pipe connector are properly connected on fuel filter. Check that grommet and "O" ring are installed on top of fuel injector. Using clamp and union from fuel injector measuring kit, connect fuel injector to delivery hose. (Scheme 63)
  9. Place vinyl tube on end of fuel injector to prevent fuel spillage. Place fuel injector into a clean graduated container.
  10. Connect scan tool to data link connector No. 3. see scheme 11- see scheme 13. Turn ignition on. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate fuel pump. NOTE: Fuel pump may also be operated to pressurize fuel system by applying battery voltage to electrical terminals on fuel pump. For operating of fuel pump, see «FUEL PUMP RESISTANCE & OPERATION (AVALON, CAMRY, CAMRY SOLARA, LAND CRUISER, SIENNA, TACOMA & 4RUNNER)»(ref-3026-S14361141662000041700000) under FUEL DELIVERY under FUEL SYSTEMS.
  11. Connect Fuel Injector Tester (09842-30070) to fuel injector for 15 seconds. (Scheme 64) Measure fuel injector volume. Test each fuel injector 2-3 times. Replace fuel injector if fuel injector volume is not within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-3026-S15371437782000041700000) table. Ensure difference between fuel injector volume on all fuel injectors is within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-3026-S15371437782000041700000) table.
  12. Disconnect fuel injector tester. Ensure fuel leakage from end of fuel injector does not exceed one drop within 12 minutes. Replace fuel injector if leakage exceeds specification. Disconnect negative battery cable. Remove test equipment.
  13. Apply light coat of engine oil on tip of pipe on fuel filter to allow for ease of disconnect fitting and No. 1 fuel pipe installation.
  14. Using NEW retainer, install No. 1 fuel pipe on fuel filter until "click" sound is head. DO NOT reuse old retainer. Pull on No. 1 fuel pipe to ensure fuel pipe connector is properly locked on fuel filter.
  15. Reinstall fuel pipe clamp until "click" sound is head. Pull upward on fuel pipe clamp to ensure clamp is securely locked on fuel filter. Install negative battery cable. Check for fuel leaks by using scan tool to energize fuel pump.

Scheme 63

Scheme 63: Fuel Injectors (Land Cruiser)
Scheme 63: Fuel Injectors (Land Cruiser)

Scheme 64

Scheme 64
Scheme 64
  1. Remove intake manifold cover located on top of engine. Remove air intake hose with intake air connector located between throttle body and air cleaner assembly. Ensure ignition is off.
  2. Disconnect electrical connector at fuel injector. Using ohmmeter, check resistance between electrical terminals on fuel injector. Replace fuel injector if resistance is not 13.4-14.2 ohms at 68°F (20°C).
  3. To check fuel injector volume, remove fuel injector. See FUEL RAILS & FUEL INJECTORS under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Fuel injector is connected to fuel filter and fuel pressure regulator for checking fuel injector volume.
  4. Ensure area around fuel filter and fuel inlet hose at end of fuel filter is clean. (Scheme 65)
  5. Depress both sides of retainer and pull fuel inlet hose with disconnect fitting from fuel filter. (Scheme 65)
  6. Purchase NEW fuel inlet hose Part No. (23271-50150) from parts department. Remove fuel pipe connector from end of NEW fuel inlet hose. (Scheme 66)
  7. Install delivery hose from Fuel Injector Measuring Kit (SST 09268-41047) with fuel pipe connector on fuel filter. (Scheme 66) Ensure delivery hose and fuel pipe connector are properly connected on fuel filter.
  8. Remove fuel pressure regulator from fuel rail. See FUEL PRESSURE REGULATOR under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Using NEW "O" ring, install Union (SST 09268-41091) from fuel injector measuring kit on fuel pressure regulator. (Scheme 66) Tighten bolts to 66 INCH lbs. (7.5 N.m). Connect delivery hose to union and fuel return hose to fuel pressure regulator.
  9. Check that "O" ring is installed on top of fuel injector. Using Adapter (SST 09268-41110) and Clamp (SST 09268-41300) from fuel injector measuring kit, connect fuel injector to delivery hose. (Scheme 66)
  10. Place vinyl tube on end of fuel injector to prevent fuel spillage. Place fuel injector into a clean graduated container.
  11. Connect scan tool to data link connector No. 3. see scheme 14 Turn ignition on. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate fuel pump. NOTE: Fuel pump may also be operated to pressurize fuel system by applying battery voltage to electrical terminals on fuel pump. For operating of fuel pump, see «FUEL PUMP RESISTANCE & OPERATION (AVALON, CAMRY, CAMRY SOLARA, LAND CRUISER, SIENNA, TACOMA & 4RUNNER)»(ref-3026-S14361141662000041700000) under FUEL DELIVERY under FUEL SYSTEMS.
  12. Connect Fuel Injector Tester (09842-30070) to fuel injector for 15 seconds. (Scheme 64) Measure fuel injector volume. Test each fuel injector 2-3 times. Replace fuel injector if fuel injector volume is not within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-3026-S15371437782000041700000) table. Ensure difference between fuel injector volume on all fuel injectors is within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-3026-S15371437782000041700000) table.
  13. Disconnect fuel injector tester. Ensure fuel leakage from end of fuel injector does not exceed one drop within 12 minutes. Replace fuel injector if leakage exceeds specification. Disconnect negative battery cable. Remove test equipment.
  14. Apply light coat of engine oil on tip of pipe on fuel filter to allow for ease of disconnect fitting and fuel inlet hose installation.
  15. Using NEW retainer, install fuel inlet hose on fuel filter until "click" sound is heard. DO NOT reuse the old retainer. Pull on fuel inlet hose to ensure fuel pipe connector is properly locked on the fuel filter.
  16. Using NEW "O" ring, install fuel pressure regulator. Tighten fuel pressure regulator bolts to 66 INCH lbs. (7.5 N.m). Install negative battery cable. Check for fuel leaks by using scan tool to energize fuel pump.

Scheme 65

Scheme 65: Fuel Injectors (Sienna)
Scheme 65: Fuel Injectors (Sienna)
  1. To check for injector operation, remove "V" bank cover on top of engine for access to fuel injectors. see scheme 6 Using stethoscope, listen for clicking sound at each fuel injector or use your finger to feel for fuel injector operation at fuel injector with engine cranking or with engine running. If fuel injector operation does not exist, check for loose connection at fuel injector electrical connector. If fuel injector electrical connector is okay, go to next step.
  2. Ensure ignition is off. Disconnect electrical connector at fuel injector. Using ohmmeter, check resistance between electrical terminals on fuel injector. Replace fuel injector if resistance is not 13.4-14.2 ohms at 68°F (20°C).
  3. If fuel injector operates and fuel injector resistance is within specification, go to next step. If fuel injector resistance is within specification but fuel injector does not operate, check wiring circuit to fuel injector. See appropriate wiring diagram in WIRING DIAGRAMS article. If problem exists in fuel injector or wiring circuit and misfire exists, a Diagnostic Trouble Code (DTC) may be stored in Engine Control Module (ECM). See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  4. To check fuel injector volume, remove fuel injector. See FUEL RAILS & FUEL INJECTORS under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Fuel injector is connected to fuel filter for checking fuel injector volume.
  5. Ensure area around fuel hose and outlet on top of fuel filter is clean. Remove union bolt with gaskets, and disconnect fuel hose from outlet at top of fuel filter. Install Union (SST 90405-09015) and delivery hose from Fuel Injector Measuring Kit (SST 09268-41047), gaskets and union bolt on top of fuel filter. (Scheme 67) Tighten union bolt to 22 ft. lbs. (30 N.m).
  6. Check that grommet and "O" ring are installed on top of fuel injector. Using Clamp (SST 09268-41100) and adapter from fuel injector measuring kit, connect fuel injector to delivery hose. (Scheme 67)
  7. Place vinyl tube on end of fuel injector to prevent fuel spillage. Place fuel injector into a clean graduated container.
  8. Connect scan tool to data link connector No. 3. see scheme 15 Turn ignition on. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate fuel pump. NOTE: Fuel pump may also be operated to pressurize fuel system by applying battery voltage to electrical terminals on fuel pump. For operating of fuel pump, see «FUEL PUMP RESISTANCE & OPERATION (AVALON, CAMRY, CAMRY SOLARA, LAND CRUISER, SIENNA, TACOMA & 4RUNNER)»(ref-3026-S14361141662000041700000) under FUEL DELIVERY under FUEL SYSTEMS.
  9. Connect Fuel Injector Tester (09842-30070) to fuel injector for 15 seconds. (Scheme 64) Measure fuel injector volume. Test each fuel injector 2-3 times. Replace fuel injector if fuel injector volume is not within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-3026-S15371437782000041700000) table. Ensure difference between fuel injector volume on all fuel injectors is within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-3026-S15371437782000041700000) table.
  10. Disconnect fuel injector tester. Ensure fuel leakage from end of fuel injector does not exceed one drop within 12 minutes. Replace fuel injector if leakage exceeds specification. Disconnect negative battery cable. Remove test equipment.
  11. Using NEW gaskets, install fuel hose on top of fuel filter. Tighten union bolt to 22 ft. lbs. (30 N.m). Install negative battery cable. Check for fuel leaks by using scan tool to energize fuel pump.

Scheme 66

Scheme 66: Fuel Injectors (Tacoma, Tundra 3.4L V6 & 4Runner)
Scheme 66: Fuel Injectors (Tacoma, Tundra 3.4L V6 & 4Runner)
  1. Remove necessary components for access to fuel injectors. Ensure ignition is off. Disconnect electrical connector at fuel injector.
  2. Using ohmmeter, check resistance between electrical terminals on fuel injector. On Tacoma and 4Runner, replace fuel injector if resistance is not 13.8 ohms at 68°F (20°C). On Tundra, replace fuel injector if resistance is not 13.4-14.2 ohms at 68°F (20°C).
  3. On all models, to check fuel injector volume, remove fuel injector. See FUEL RAILS & FUEL INJECTORS under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Fuel injector is connected to fuel inlet pipe and fuel pressure regulator for checking fuel injector volume.
  4. Ensure area around fuel inlet pipe and fuel inlet hose is clean. Fuel inlet hose goes from fuel inlet pipe near the frame up to the fuel rail. Disconnect fuel inlet hose from fuel inlet pipe. Connect Adapter (SST 09268-52011) and delivery hose from Fuel Injector Measuring Kit (SST 09268-41047) to fuel inlet pipe. see scheme 95
  5. Remove fuel pressure regulator from fuel rail. See FUEL PRESSURE REGULATOR under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Using NEW "O" ring, install Union (SST 09268-41091) on fuel pressure regulator. see scheme 95 Connect delivery hose to union and fuel return hose on fuel pressure regulator.
  6. Check that "O" ring is installed on top of fuel injector. Connect fuel injector to the delivery hose. see scheme 95 Place vinyl tube on end of fuel injector to prevent fuel spillage. Place fuel injector into a clean graduated container.
  7. Connect scan tool to data link connector No. 3. see scheme 16- see scheme 18. Turn ignition on. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate fuel pump. NOTE: On Tacoma and 4Runner, fuel pump may also be operated to pressurize fuel system by applying battery voltage to electrical terminals on fuel pump. For operating of fuel pump, see «FUEL PUMP RESISTANCE & OPERATION (AVALON, CAMRY, CAMRY SOLARA, LAND CRUISER, SIENNA, TACOMA & 4RUNNER)»(ref-3026-S14361141662000041700000) under FUEL DELIVERY under FUEL SYSTEMS.
  8. Connect Fuel Injector Tester (09842-30070) to fuel injector for 15 seconds. (Scheme 64) Measure fuel injector volume. Test each fuel injector 2-3 times. Replace fuel injector if fuel injector volume is not within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-3026-S15371437782000041700000) table. Ensure difference between fuel injector volume on all fuel injectors is within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-3026-S15371437782000041700000) table.
  9. Disconnect fuel injector tester. Ensure fuel leakage from end of fuel injector does not exceed one drop within 12 minutes. Replace fuel injector if leakage exceeds specification. Disconnect negative battery cable. Remove test equipment.
  10. Using NEW "O" ring, install fuel pressure regulator. Tighten fuel pressure regulator bolts to 71 INCH lbs. (8.0 N.m). Install negative battery cable. Check for fuel leaks by using scan tool to energize fuel pump.

Scheme 67

Scheme 67: Fuel Injectors (Tundra 4.7L V8)
Scheme 67: Fuel Injectors (Tundra 4.7L V8)
  1. Remove throttle body cover and air intake hose with intake air connector located between throttle body and air cleaner assembly. Ensure ignition is off. Disconnect electrical connector at fuel injector.
  2. Using ohmmeter, check resistance between electrical terminals on fuel injector. Replace fuel injector if resistance is not 13.4-14.2 ohms at 68°F (20°C).
  3. To check fuel injector volume, remove fuel injector. See FUEL RAILS & FUEL INJECTORS under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Fuel injector is connected to fuel inlet pipe and fuel pressure regulator for checking fuel injector volume.
  4. Ensure area around fuel inlet pipe and fuel inlet hose is clean. Fuel inlet hose goes from fuel inlet pipe near the frame up to the fuel rail. Disconnect fuel inlet hose from fuel inlet pipe. Connect Adapter (SST 09268-52011) and delivery hose from Fuel Injector Measuring Kit (SST 09268-41047) to fuel inlet pipe. see scheme 96
  5. Remove fuel pressure regulator from fuel rail. See FUEL PRESSURE REGULATOR under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Using NEW "O" ring, install Union (SST 09268-41091) on fuel pressure regulator. see scheme 96 Tighten bolts to 66 INCH lbs. (7.5 N.m). Connect delivery hose to union and fuel return hose on fuel pressure regulator.
  6. Check that "O" ring is installed on top of fuel injector. Using Adapter (SST 09268-41110) and Clamp (SST 09268-41300) from fuel injector measuring kit, connect fuel injector to the delivery hose. see scheme 96
  7. Place vinyl tube on end of fuel injector to prevent fuel spillage. Place fuel injector into a clean graduated container.
  8. Connect scan tool to data link connector No. 3. see scheme 17 Turn ignition on. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate fuel pump.
  9. Connect Fuel Injector Tester (09842-30070) to fuel injector for 15 seconds. (Scheme 64) Measure fuel injector volume. Test each fuel injector 2-3 times. Replace fuel injector if fuel injector volume is not within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-3026-S15371437782000041700000) table. Ensure difference between fuel injector volume on all fuel injectors is within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-3026-S15371437782000041700000) table.
  10. Disconnect fuel injector tester. Ensure fuel leakage from end of fuel injector does not exceed one drop within 12 minutes. Replace fuel injector if leakage exceeds specification. Disconnect negative battery cable. Remove test equipment.
  11. Using NEW "O" ring, install fuel pressure regulator. Tighten fuel pressure regulator bolts to 66 INCH lbs. (7.5 N.m). Install negative battery cable. Check for fuel leaks by using scan tool to energize fuel pump.
ApplicationCu. In. (cc)
Volume
Avalon, Camry, Camry Solara & Sienna3.7-4.5 (60-73)
Land Cruiser, Tacoma & Tundra3.4-4.2 (56-69)
4Runner3.4-4.5 (56-73)
Maximum Difference Between Fuel Injectors
All Models.8 (13)

FUEL INJECTOR VOLUME SPECIFICATIONS

More articles — Engine Controls - System & Component Testing - V6 & V8