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Land Cruiser, Sequoia, Tundra 4.7L V8 & 4Runner

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Toyota Tundra, 2002 Toyota Tacoma, 2002 Toyota Sienna, 2002 Toyota Sequoia, and 2002 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. On Land Cruiser, remove intake manifold cover located on top of engine for access to throttle body. On Sequoia and Tundra, remove throttle body cover for access to throttle body. On all models, ensure throttle cable and throttle lever on throttle body moves smoothly. Note location of throttle control motor on throttle body. See Fig 1 and Fig 2 .
    Fig 1: Locating Electronic Throttle Control System Components On Throttle Body (Land Cruiser, Sequoia & Tundra 4.7L V8)
    G98D01628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Locating Electronic Throttle Control System Components On Throttle Body (4Runner)
    G00028695Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. To test operation of throttle control motor, turn ignition on. Rotate throttle lever on throttle body to full throttle while listing for operating sound at throttle control motor and check that no grinding noise is heard at throttle control motor and throttle body. Throttle lever will also rotate accelerator pedal position sensor.
  3. If throttle control motor operating sound is heard, go to next step. If throttle control motor operating sound is not heard, throttle control motor, wiring harness or Engine Control Motor (ECM) may be defective. On Land Cruiser, ECM is located above glove box, near passenger's side of instrument panel. On Sequoia and Tundra, ECM is located behind glove box and heater duct. On 4Runner, ECM is located behind glove box. On all models, for illustration of ECM location, see THEORY & OPERATION article. Go to step  12 for testing of throttle control motor. For wiring of throttle control motor, see WIRING DIAGRAMS article.
  4. To test operation of accelerator pedal position sensor, Toyota hand-held tester may be used or voltmeter may be used. If Toyota hand-held tester is available, go to next step. If using voltmeter, go to step  8.
  5. Connect hand-held tester to data link connector No. 3 at driver's side of instrument panel. See Figure, Figure,Figure andFigure . Hand-held tester is used to read throttle valve opening which is displayed as a percentage. Check that ignition is on. Ensure Malfunction Indicator Light (MIL) on instrument panel is not illuminated. MIL is displayed as an engine icon. If MIL is not illuminated, go to next step. If MIL is illuminated, a Diagnostic Trouble Code (DTC) may be stored in ECM. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
  6. Rotate throttle lever on throttle body to full throttle while reading throttle valve opening on hand-held tester which is accessed by THROTTLE POS under CURRENT DATA. Throttle lever will also rotate accelerator pedal position sensor. Throttle valve opening should be at least 60 percent.
  7. If throttle valve opening is at least 60 percent, go to step  10. If throttle valve opening is not at least 60 percent, problem may exist in accelerator pedal position sensor, wiring circuit or ECM. Go to step  15 for testing of accelerator pedal position sensor. For wiring of accelerator pedal position sensor, see WIRING DIAGRAMS article.
  8. Access Engine Control Module (ECM). On Land Cruiser, ECM is located above glove box, near passenger's side of instrument panel. On Sequoia and Tundra, ECM is located behind glove box and heater duct. On 4Runner, ECM is located behind glove box. On all models, for illustration of ECM location, see THEORY & OPERATION article. On all models, ensure ignition is on. Using voltmeter, check voltage between ECM terminals VPA and E2 with accelerator pedal released and with accelerator pedal fully depressed. See Fig 3 and Fig 4 . See ECM TERMINAL WIRE COLOR IDENTIFICATION  table.
    ECM TERMINAL WIRE COLOR IDENTIFICATION

    Application & ECM Terminal Wire Color
    Land Cruiser
    E2 Brown/White
    VPA Red
    Sequoia & Tundra
    E2 Green/White
    VPA Green/Red
    4Runner
    E2 Blue/Black
    VPA Gray
    Fig 3: Testing Voltage At Engine Control Module Terminals VPA & E2 (Land Cruiser, Sequoia & Tundra 4.7L V8)
    G98I12482Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Testing Voltage At Engine Control Module Terminals VPA & E2 (4Runner)
    G00025411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. Voltage should.3-.9 volt with accelerator pedal released and 3.2-4.8 volts with accelerator pedal fully depressed. If voltage is within specification, go to next step. If voltage is not within specification, problem may exist in accelerator pedal position sensor, wiring circuit or ECM. Go to step  15 for testing of accelerator pedal position sensor. For wiring of accelerator pedal position sensor, see WIRING DIAGRAMS article.
  10. Start engine and allow engine to idle. Idle speed should be checked. Check operation of Malfunction Indicator Light (MIL) on instrument panel. MIL is displayed as an engine icon. If MIL is not illuminated, go to next step. If MIL is illuminated, a Diagnostic Trouble Code (DTC) may be stored in ECM. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
  11. Allow engine to warm to normal operating temperature. Apply parking brake. Place transmission in Neutral. Ensure A/C is off. Note engine idle speed. Engine idle speed should be 650-750 RPM. If all previous steps have been performed, drive vehicle to verify proper operation of throttle body.
  12. To test throttle control motor, disconnect electrical connector at throttle control motor. See Fig 1 and Fig 2 . Note terminal identification on throttle control motor. See Fig 5 and Fig 6 .
  13. Using ohmmeter, check resistance between specified terminals on throttle control motor. See THROTTLE CONTROL MOTOR RESISTANCE  table. If resistance is within specification, reinstall electrical connector. Go to next step. On Land Cruiser, Sequoia and Tundra, if resistance is not within specification, replace throttle control motor. See THROTTLE BODY under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. On 4Runner, if resistance is not within specification, replace throttle body with throttle control motor as an assembly. See THROTTLE BODY under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article.
    THROTTLE CONTROL MOTOR RESISTANCE

    Terminal No. Ohms @ 68°F (20°C)
    Land Cruiser, Sequoia & Tundra
    1 & 2 .3-100.0
    3 & 4 4.2-5.2
    4Runner
    1 & 2 4.2-5.2
    3 & 4 .3-100.0
    Fig 5: Identifying Terminals & Testing Throttle Control Motor (Land Cruiser, Sequoia & Tundra 4.7L V8)
    G98J12483Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Identifying Terminals & Testing Throttle Control Motor (4Runner)
    G00025415Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. To test TP sensor, disconnect electrical connector at TP sensor. See Fig 1 and Fig 2 . Using ohmmeter, check resistance between terminals VC and E2 on TP sensor. See Fig 7 and Fig 8 . Ensure resistance is within specification. See TP SENSOR RESISTANCE  table. On Land Cruiser, Sequoia and Tundra, if resistance is not within specification, replace TP sensor. See THROTTLE BODY under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. On 4Runner, if resistance is not within specification, replace throttle body with TP sensor as an assembly. See THROTTLE BODY under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article.
    TP SENSOR RESISTANCE

    Application Ohms @ 68°F (20°C)
    Land Cruiser, Sequoia & Tundra 1250-2350
    4Runner 1200-3200
  15. To test accelerator pedal position sensor, disconnect electrical connector at accelerator pedal position sensor. See Fig 1 and Fig 2 . Using ohmmeter, check resistance between terminals VC and E2 on accelerator pedal position sensor. See Fig 9 and Fig 10 . Ensure resistance is within specification. See ACCELERATOR PEDAL POSITION SENSOR RESISTANCE  table. On Land Cruiser, Sequoia and Tundra, if resistance is not within specification, replace accelerator pedal position sensor. See THROTTLE BODY under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. On 4Runner, if resistance is not within specification, replace throttle body with accelerator pedal position sensor as an assembly. See THROTTLE BODY under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article.
    ACCELERATOR PEDAL POSITION SENSOR RESISTANCE

    Application Ohms @ 68°F (20°C)
    Land Cruiser, Sequoia & Tundra 1640-3280
    4Runner 1200-3200
    Fig 7: Identifying Terminals & Testing Throttle Position Sensor (Land Cruiser, Sequoia & Tundra 4.7L V8)
    G98A12484Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 8: Identifying Terminals & Testing Throttle Position Sensor (4Runner)
    G00011357Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 9: Identifying Terminals & Testing Accelerator Pedal Position Sensor (Land Cruiser, Sequoia & Tundra 4.7L V8)
    G98B12485Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 10: Identifying Terminals & Testing Accelerator Pedal Position Sensor (4Runner)
    G00025419Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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