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Engine Controls - System & Component Testing - V6 & V8: Overview Toyota 4Runner III

Testing & Diagnostics 18 illustrations ~2282 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 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, use ohmmeter to check resistance between specified terminals on fuel pump electrical connector. (Scheme 213)- (Scheme 217). 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 213)- (Scheme 217). 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 213

Scheme 213
Scheme 213

Scheme 214

Scheme 214
Scheme 214

Scheme 215

Scheme 215
Scheme 215

Scheme 216

Scheme 216
Scheme 216

Scheme 217

Scheme 217
Scheme 217

Scheme 218

Scheme 218: Fuel Injectors (Avalon, Camry & Camry Solara)
Scheme 218: Fuel Injectors (Avalon, Camry & Camry Solara)

Scheme 219

Scheme 219
Scheme 219
  1. Remove "V" bank cover on top of engine for access to fuel injectors. see scheme 3
  2. Ensure ignition is off. Disconnect electrical connector at fuel injector. Using ohmmeter, check resistance between electrical terminals on fuel injector. On Avalon, replace fuel injector if resistance is not 13.8 ohms at 68°F (20°C). On Camry and Camry Solara, 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 SYSTEM in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Fuel injector is connected to fuel filter for checking fuel injector volume.
  4. Remove fuel pipe clamp from No. 1 fuel pipe at fuel filter. Perform STEP 1. (Scheme 218) Ensure area around No. 1 fuel pipe and fuel filter is clean.
  5. Depress both sides of retainer and pull No. 1 fuel pipe with disconnect fitting from fuel filter. Perform STEP 2. (Scheme 218)
  6. On Avalon, purchase No. 1 fuel pipe Part No. (23801-20040) 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 219)
  7. Install delivery hose from Fuel Injector Measuring Kit (SST 09268-41047) with fuel pipe connector on fuel filter. (Scheme 219) 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 219)
  8. Place fuel injector into a clean graduated container. Place vinyl tube on end of fuel injector to prevent fuel spillage.
  9. Connect scan tool to data link connector No. 3. (Scheme 225)- (Scheme 227). 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-91239-S12159651692001030600000) under FUEL DELIVERY under FUEL SYSTEM.
  10. Connect Fuel Injector Tester (09842-30070) to fuel injector for 15 seconds. (Scheme 220) 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-91239-S15780845672001030600000) table. Ensure difference between fuel injector volume on all fuel injectors is within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-91239-S15780845672001030600000) table.
  11. 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.
  12. 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.
  13. 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.
  14. 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 220

Scheme 220: Fuel Injectors (Land Cruiser)
Scheme 220: Fuel Injectors (Land Cruiser)

Scheme 221

Scheme 221
Scheme 221
  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 SYSTEM 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 221)
  5. Depress both sides of retainer and pull fuel inlet hose with disconnect fitting from fuel filter. (Scheme 221)
  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 222)
  7. Install delivery hose from Fuel Injector Measuring Kit (SST 09268-41047) with fuel pipe connector on fuel filter. (Scheme 222) Ensure delivery hose and fuel pipe connector are properly connected on fuel filter.
  8. Remove fuel pressure regulator from fuel rail. See FUEL SYSTEM 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 222) 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 222)
  10. Place fuel injector into a clean graduated container. Place vinyl tube on end of fuel injector to prevent fuel spillage.
  11. Connect scan tool to data link connector No. 3. (Scheme 228) 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-91239-S12159651692001030600000) under FUEL DELIVERY under FUEL SYSTEM.
  12. Connect Fuel Injector Tester (09842-30070) to fuel injector for 15 seconds. (Scheme 220) 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-91239-S15780845672001030600000) table. Ensure difference between fuel injector volume on all fuel injectors is within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-91239-S15780845672001030600000) 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 222

Scheme 222: Fuel Injectors (Sienna)
Scheme 222: Fuel Injectors (Sienna)
  1. Remove "V" bank cover on top of engine for access to fuel injectors. see scheme 4 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 SYSTEM in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Fuel injector is connected to fuel filter for checking fuel injector volume.
  4. Ensure area around fuel hose and outlet on top of fuel filter is clean. Remove union bolts 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 223) Tighten union bolt to 22 ft. lbs. (30 N.m).
  5. 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 223)
  6. Place fuel injector into a clean graduated container. Place vinyl tube on end of fuel injector to prevent fuel spillage.
  7. Connect scan tool to data link connector No. 3. (Scheme 229) 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-91239-S12159651692001030600000) under FUEL DELIVERY under FUEL SYSTEM.
  8. Connect Fuel Injector Tester (09842-30070) to fuel injector for 15 seconds. (Scheme 220) 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-91239-S15780845672001030600000) table. Ensure difference between fuel injector volume on all fuel injectors is within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-91239-S15780845672001030600000) 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 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 223

Scheme 223: Fuel Injectors (Tacoma & 4Runner)
Scheme 223: Fuel Injectors (Tacoma & 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. Replace fuel injector if resistance is not 13.8 ohms at 68°F (20°C).
  3. To check fuel injector volume, remove fuel injector. See FUEL SYSTEM 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. (Scheme 224)
  5. Remove fuel pressure regulator from fuel rail. See FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Using NEW "O" ring, install Union (SST 09268-41091) on fuel pressure regulator. (Scheme 224) 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. (Scheme 224) Place fuel injector into a clean graduated container. Place vinyl tube on end of fuel injector to prevent fuel spillage.
  7. Connect scan tool to data link connector No. 3. (Scheme 230)- see scheme 76. 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-91239-S12159651692001030600000) under FUEL DELIVERY under FUEL SYSTEM.
  8. Connect Fuel Injector Tester (09842-30070) to fuel injector for 15 seconds. (Scheme 220) 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-91239-S15780845672001030600000) table. Ensure difference between fuel injector volume on all fuel injectors is within specification. See «FUEL INJECTOR VOLUME SPECIFICATIONS»(ref-91239-S15780845672001030600000) 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.
ApplicationCu. In. (cc)
Volume
Avalon, Camry, Camry Solara & Sienna3.7-4.5 (60-73)
Land Cruiser & Tacoma3.4-4.2 (56-69)
4Runner3.4-4.5 (56-73)
Maximum Difference Between Fuel Injectors
All Models.8 (13)

FUEL INJECTOR VOLUME SPECIFICATIONS

Scheme 224

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Scheme 227
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Scheme 228

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Scheme 229

Scheme 229
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Scheme 230

Scheme 230
Scheme 230

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