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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 28 (Engine Controls - System & Component Testing - V6 & V8) >> Idle Control Systems >> Idle Air Control Valve >> Camry Solara, Tacoma & Tundra 3.4L V6

Camry Solara, Tacoma & Tundra 3.4L V6

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. Start engine. Warm engine to normal operating temperature. Ensure idle speed is within specification. See IDLE SPEED & MIXTURE in ON-VEHICLE ADJUSTMENTS - V6 & V8 article.
  2. Turn ignition off. Apply parking brake and place transmission/transaxle in Neutral. Ensure A/C is off.
  3. On Camry Solara, install Jumper Wire (SST 09843-18020 or SST 09843-18040) between terminals TC and E1 on data link connector No. 1 located at passenger's side of engine compartment, near strut tower. See Fig 2. Go to step  5.
  4. On Tacoma and Tundra, note location of data link connector No. 3 at driver's side of instrument panel. See Figure and Figure . Install Jumper Wire (SST 09843-18020 or SST 09843-18040) between terminals No. 4 (CG) and 13 (TC) on data link connector No. 3. See Fig 4. Go to next step.
  5. On all models, start engine and note engine speed. On Camry Solara and Tacoma, engine speed should increase to 1000 RPM for 5 seconds and then return to idle speed. On Tundra, engine speed should increase to 900-1500 RPM for 5 seconds and then return to idle speed. On all models, if engine speed is not as specified, test IAC valve resistance and IAC valve operation. Go to next step. If engine speed is as specified, remove jumper wire. Turn ignition off.
  6. To test IAC valve resistance, ensure ignition is off. Disconnect electrical connector at IAC valve. IAC valve is located on lower area of throttle body. Using ohmmeter, checking resistance between +B terminal and each remaining terminal on IAC valve. See Fig 6-Fig 7 .
  7. Replace IAC valve if resistance is not within specification. See IAC VALVE RESISTANCE  table.
    IAC VALVE RESISTANCE

    Application Ohms
    Camry Solara
    Cold (1) 17.0-24.5
    Hot (2) 21.5-28.5
    Tacoma & Tundra
    Cold (1) 17.0-25.0
    Hot (2) 21.5-29.5
    (1) Cold is with temperature of 14-122°F (-10-50°C).
    (2) Hot is with temperature of 122-212°F (50-100°C).
  8. To test IAC valve operation, remove IAC valve from throttle body. See THROTTLE BODY under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Apply battery voltage to +B terminal on IAC valve. Apply battery ground to proper terminal and ensure valve opens and closes. See Fig 8 and Fig 9 . Replace IAC valve if defective.
  9. If IAC valve resistance is within specification and operates properly, check wiring circuit between Engine Control Module (ECM) and IAC valve. See ECM LOCATION  table. See WIRING DIAGRAMS article. If all components and wiring circuit are okay, but idle problem still exists, the air assist system may be defective. For testing of air assist system, see AIR ASSIST SYSTEM .
    ECM LOCATION

    Model (1) Location
    Avalon Behind Glove Box, Near Passenger's Side Kick Panel
    Camry Solara Behind Glove Box
    Sienna Passenger's Side Of Instrument Panel, Just Below Glove Box
    Tacoma Behind Glove Box
    Tundra Behind Glove Box & Heater Duct
    (1) For illustration of ECM location, see THEORY & OPERATION article.
    Fig 1: Installing Jumper Wire Between Data Link Connector No. 1 Terminals (Avalon)
    G99D52830Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Installing Jumper Wire Between Data Link Connector No. 1 Terminals (Camry Solara)
    G00025446Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 3: Locating Data Link Connector No. 1 & Identifying Terminals TC & E1 On Data Link Connector No. 1 (Sienna)
    G00023128Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Identifying Data Link Connector No. 3 Terminals (Tacoma & Tundra)
    G99C52821Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 5: Testing Idle Air Control Valve Operation (Avalon, Highlander & Sienna)
    G00009731Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Testing Idle Air Control Valve Resistance (Camry Solara)
    G97H06487Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 7: Testing Idle Air Control Valve Resistance (Tacoma & Tundra 3.4L V6)
    G96J09948Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 8: Testing Idle Air Control Valve Operation (Camry Solara)
    G95J32655Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 9: Testing Idle Air Control Valve Operation (Tacoma & Tundra 3.4L V6)
    G95C34431Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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