Wednesday, June 8, 2011

Toyota tacoma intake manifold and IAC valve cleaning and disassembly procedure?

Your throttle body is probably dirty,The throttle body has a hose from the air filter housing attached to it,the throttle body is attached to the intake phlenum.Take the hose off(its rubber with a clamp on it).Do this with a cold engine, NOT RUNNING ! spray some carburetor cleaner inside the venturi and scrub it with a toothbrush,on the side of the throttle body there is a place where a cable goes into,twist the direction of cable to open the throttle plate(inside the throttle body),and continue to clean.Now put it all back together.What happens over a period of time is the Throttle body gets clogged with carbon and cannot breath at idle, the throttle plate when close(at idle)has a very small air gap and cant breath when dirty.If this does not cure your problem,then you will need to replace IAC, idle air control motor / valve replaced.For this you will have to take the throttle body off to replace it and the screws have been installed with locktight and are tricky to get out..



  • ** Be careful that any cleaners used are for Fuel Injected systems and are O2 sensor safe. Some Carburator Cleaners can damage FI components.**
  • Spraying a throttle body spray cleaner, such as one sold by STP, to clean the throttle body, then starting up and revving the engine, may be enough to dislodge the carbon deposits and material blocking the airway.

-----------------
In some cases intake manifold is the issue for this problem.
The intake manifold is a rectangular, ribbed component located in the middle of engines.
Occasionally, an intake manifold needs replacement if coolant is leaking into the oil system, or if the manifold becomes cracked from temperture extremes, such as sub-zero weather or an excessively overheated engine. Intake manifolds are responsible for diverting air from the filter and throttle body assembly to the chamber heads for combustion. The manifold is also the initial place where the fuel and air mixture is atomized in preparation for combustion.
  • Disconnect the cable from the negative battery terminal by unscrewing nut with a wrench.

  • Place a catch pan beneath the radiator and drain the coolant from the engine by unscrewing the drain plug. Unclasp and unscrew the connections for the air filter box. Use a screwdriver to loosen the hose clamp of the fresh air tube connected to the valve cover. Disconnect the throttle body cable bracket from the throttle body-manifold connection with a socket wrench. Loosen the clamp of the output hose connecting the air filter and throttle body and remove the throttle body and filter box assembly from the manifold.

  • Use a tape and marker to label the plug-in locations for all sensors, tubes and vacuum hoses connected to the air intake manifold and valve cover, including the fuel injector wiring, idle air control valve (IAC), throttle position sensor (TSP), the exhaust gas recirculation (EGR) valve and the manifold absolute pressure (MAP) sensor. This will help to quickly identify where each wire and hose is located once the manifold is replaced. Use corks to plug up fuel lines leading to the manifold once they are removed. Disconnect the line from the cylinder head coolant outlet, positioning it over the catch pan so that any remaining coolant will drip into the pan.

  • Unscrew the intake manifold support bracket bolt, which can be accessed from the top of the engine or below.

  • Loosen the serpentine belt by turning the tensioner adjustment bolt counterclockwise with a socket wrench. Remove the serpentine belt. Use a socket wrench to disconnect the power steering pump from the engine, and place it on top of the dash panel so that its hoses can remain connected.

  • Use a torque wrench to unscrew the manifold retaining bolts. Access the lower manifold plenum retaining bolts from below the engine. Remove the upper and lower manifold plenums separately.

  • Now clean the intake manifold with the carb cleaner or throttle cleaner.Its easily available at local auto-part stores.




    ------------

    Intake Manifold


    Removal & Installation



    1gr-FE Engine


    Click image to see an enlarged view

    Fig. Intake manifold and related components-4.0L engine

    1. Before servicing the vehicle, refer to the Precautions Section.
    2. Properly relieve the fuel system pressure.
    3. Properly disarm the SRS system
    4. Disconnect the negative battery cable.
    5. Drain the engine coolant. Remove the air cleaner assembly.
    6. Disconnect the fuel injector wiring connectors.
    7. Remove the necessary components in order to gain access to the intake manifold retaining bolts.
    8. Remove the intake manifold retaining bolts. Remove the intake manifold from the engine.

    To install:

    1. Clean all surfaces.
    2. Install a new gasket on each cylinder head.
      NOTE
      Align the ports of the gasket and the cylinder head. Be careful of the installation direction. Position the intake manifold to the engine.

    3. Install the retaining bolts and tighten to specification, in an alternating sequence.
    4. Continue the installation in the reverse order of the removal procedure.
    5. Be sure to fill the cooling system with the proper grade and type engine coolant.
    6. Start the engine and check for leaks. Correct as required.

    2RZ-FE Engine
    1. Relieve the fuel system pressure.
    2. Disconnect the negative battery cable.
    3. Drain the engine coolant.
    4. Remove or disconnect the following:

      Air cleaner cap
      Mass Air Flow (MAF) meter and the resonator
      Accelerator cable from the throttle body, if equipped with a manual transaxle
      Accelerator and throttle cables from the throttle body, if equipped with an automatic transaxle
      Intake air connector
      Air conditioning idle-up valve, if equipped with air conditioning
      No. 1 and No. 2 Positive Crankcase Ventilation (PCV) hoses
      Spark plug wires from the spark plugs
      Throttle body
      Air conditioning compressor connector, if equipped with air conditioning
      Oil pressure sensor connector
      Engine Coolant Temperature (ECT) sensor connector
      Exhaust Gas Recirculation (EGR) gas temperature sensor connector
      EGR Vacuum Switching Valve (VSV) connector

    5. Disconnect the engine wiring harness, as follows:

      2 bolts and the harness from the intake chamber
      5 engine harness clamps and harness

    6. Remove or disconnect the following:

      Knock (KS) sensor connector
      Crankshaft Position (CKP) sensor connector
      Fuel pressure control VSV connector
      Data Link Connector 1 (DLC1) from the bracket
      2 engine wiring harness clamps
      Engine wiring harness
      Fuel injectors
      EGR valve and vacuum modulator
      Intake chamber stay, by removing the 2 bolts
      Fuel return pipe, by removing the hoses and 2 bolts

    7. Remove the intake chamber, as follows:

      Vacuum hose, from the gas filter
      Brake booster vacuum hose, from the intake chamber
      3 bolts, 2 nuts, air intake chamber and gasket

    8. Remove the fuel inlet tube, by removing the union bolts
    9. Remove the delivery pipe and injectors, as follows:

      Vacuum hose, from the fuel pressure regulator
      Bolts and delivery pipe together with the 4 injectors
      4 insulators, from the 4 spacers
      Injectors from the delivery pipe
      O-ring and grommet, from each injector

    10. Remove or disconnect the following:

      Intake manifold, by removing the 3 bolts and 2 nuts
      Gasket


    To install:

    1. Clean the intake manifold surfaces.
    2. Install or connect the following:

      New gasket
      Intake manifold. Tighten the bolts and nuts to 22 ft. lbs. (30 Nm).

    3. Install the injectors to the delivery pipe, as follows:
      NOTE
      Check that the injectors rotate smoothly.



      New grommet to the injector
      New O-ring onto the injector, by lubricating it with gasoline
      Injectors to the delivery pipe
      Injector with the connector facing upward
      Injectors and delivery pipe. Tighten the bolts to 15 ft. lbs. (21 Nm).



      Fuel tube, with new gaskets. Tighten the union bolts to 22 ft. lbs. (30 Nm).

    4. Install the air intake chamber, as follows:

      New gasket
      Air intake chamber. Tighten the bolts and nuts to 15 ft. lbs. (21 Nm).
      Vacuum hose, to the gas filter
      Brake booster vacuum hose, to the intake chamber

    5. Install or connect the following:

      Fuel return pipe
      Intake chamber stay. Tighten the bolts to 14 ft. lbs. (20 Nm).
      EGR valve and vacuum modulator
      Injector connectors

    6. Connect the engine wiring harness to the engine, as follows:

      Engine wiring harness to the intake manifold
      Engine wiring harness clamps
      DLC1 to the bracket
      Fuel pressure control VSV connector
      KS sensor connector
      CKP sensor connector
      5 engine wiring harness clamps
      Engine wiring harness, to the intake chamber

    7. Install or connect the following:

      EGR VSV connector
      EGR gas temperature sensor connector
      ECT sensor connector
      Oil pressure sensor connector
      Compressor connector, if equipped with air conditioning
      Throttle body
      Spark plug wires, to the spark plugs
      No. 1 and No. 2 PCV hoses
      Air conditioning idle up valve, if equipped with air conditioning
      Air intake connector
      Accelerator cable, to the throttle body, if equipped with a manual transaxle
      Throttle and accelerator cables to the throttle body, if equipped with automatic transaxle
      MAF meter, resonator and the air cleaner cap
      Negative battery cable

    8. Refill the cooling system.
    9. Start the engine and check for leaks.
    10. Check the ignition timing. Road test the vehicle for proper operation.
    11. Recheck all fluid levels.

      Click image to see an enlarged view

      Fig. Intake manifold and related components-2.4L and 2.7L (3RZ-FE/M) engines


    2TR-FE Engine


    Click image to see an enlarged view

    Fig. Intake manifold and related components-2.7L (2TR-FE) engine

    1. Before servicing the vehicle, refer to the Precautions Section.
    2. Properly relieve the fuel system pressure.
    3. Properly disarm the SRS system
    4. Disconnect the negative battery cable.
    5. On 4WD and PreRunner, remove the engine undercover subassembly.
    6. Drain the engine coolant. Remove the air intake connector.
    7. Remove the throttle body and motor assembly. Disconnect the fuel hoses.
    8. Disconnect the fuel vapor feed hose from the VSR. Disconnect the vacuum hose. Remove the bolt, and then remove the clamp bracket.
    9. Disconnect the number two water bypass hose. Disconnect the number three ventilation hose. Disconnect the VSV connector.
    10. Disengage the engine wire harness clamp. Disconnect the air conditioning compressor magnetic clutch connector.
    11. Disengage the wire harness clamp. Remove the bolt and harness clamp bracket. Disconnect the three connectors.
    12. Remove the retaining nut inside the relay block. Disconnect the engine wire harness from the relay block.
    13. Remove the five bolts and two nuts retaining the intake manifold in place. Remove the intake manifold from the engine.

    To install:

    1. Clean all surfaces.
    2. Install a new gasket onto the intake manifold. Position the intake manifold to the engine.
    3. Install the retaining bolts and tighten to specification, in an alternating sequence.
    4. Continue the installation in the reverse order of the removal procedure.
    5. Be sure to fill the cooling system with the proper grade and type engine coolant.
    6. Start the engine and check for leaks. Correct as required.

    3RZ-FE Engine
    1. Before servicing the vehicle, refer to the Precautions Section.
    2. Relieve the fuel system pressure.
    3. Disconnect the negative battery cable.
    4. Drain the engine coolant.
    5. Remove or disconnect the following:

      Air cleaner cap
      Mass Air Flow (MAF) meter and resonator
      Accelerator cable, from the throttle body, if equipped with a manual transaxle
      Accelerator and throttle cables, from the throttle body, if equipped with an automatic transaxle
      Intake air connector
      Air conditioning idle-up valve, if equipped with air conditioning
      No. 1 and No. 2 PCV hoses
      Spark plug wires, from the spark plugs
      Throttle body

    6. Detach the following connectors:

      Air conditioning compressor connector, if equipped with air conditioning
      Oil pressure sensor connector
      Engine Coolant Temperature (ECT) sensor connector
      Exhaust Gas Recirculation (EGR) gas temperature sensor connector
      EGR Vacuum Switching Valve (VSV) connector

    7. Disconnect the engine wiring harness, as follows:

      Engine wiring harness, from the intake chamber
      5 engine wiring harness clamps and engine wiring harness
      Knock (KS) sensor connector
      Crankshaft Position (CKP) sensor connector
      Fuel pressure control VSV connector
      Data Link Connector 1 (DLC1), from the bracket
      2 engine wiring harness clamps.
      Engine wiring harness from the engine

    8. Remove or disconnect the following:

      Fuel injectors
      EGR valve and vacuum modulator
      Intake chamber stay
      Fuel return pipe

    9. Remove the intake chamber, as follows:

      Vacuum hose, from the gas filter
      Brake booster vacuum hose, from the intake chamber
      Intake chamber and gasket
      Fuel inlet tube, by removing the union bolts

    10. Remove the delivery pipe and injectors, as follows:

      Vacuum hose, from the fuel pressure regulator
      Delivery pipe, with the 4 injectors
      4 insulators, from the 4 spacers
      4 injectors, from the delivery pipe
      O-ring and grommet, from each injector

    11. Remove or disconnect the following:

      Intake manifold
      Gasket


    To install:

    1. Clean the intake manifold surfaces.
    2. Install or connect the following:

      New gasket
      Intake manifold. Tighten the bolts and nuts to 22 ft. lbs. (30 Nm).

    3. Install the injectors to the delivery pipe, as follows:

      New grommet onto the injector
      New O-ring onto the injector, lubricated with gasoline
      Injectors onto the delivery pipe, with the electrical connector upward

    4. Install or connect the following:
      NOTE
      Check that the injectors rotate smoothly.



      Delivery pipe. Tighten the bolts to 15 ft. lbs. (21 Nm).



      Fuel tube, with new gaskets. Tighten the union bolts to 22 ft. lbs. (30 Nm).

    5. Install the air intake chamber, as follows:

      Air intake chamber with a new gasket. Tighten the bolts and nuts to 15 ft. lbs. (21 Nm).
      Vacuum hose, to the gas filter
      Brake booster vacuum hose, to the intake chamber

    6. Install or connect the following:

      Fuel return pipe
      Intake chamber stay. Tighten the bolts to 14 ft. lbs. (20 Nm).

    7. Install the EGR valve and vacuum modulator, as follows:

      New gasket, EGR valve and vacuum modulator. Tighten the bolt to 74 inch lbs. (9 Nm) and the nuts to 14 ft. lbs. (19 Nm).
      Vacuum hoses, to the EGR VSV
      Water bypass hose
      EGR pipe, using new gaskets. Tighten the bolts to 14 ft. lbs. (18 Nm), intake manifold nuts to 14 ft. lbs. (19 Nm) and the cylinder head nuts to 15 ft. lbs. (20 Nm).
      Injector connectors

    8. Connect the engine wiring harness to the engine, as follows:

      Engine wiring harness, to the intake manifold
      2 engine wiring harness clamps
      DLC1, to the bracket
      Fuel pressure control VSV connector
      KS sensor connector
      CKP sensor connector
      5 engine wiring harness clamps.
      Engine wiring harness, to the intake chamber

    9. Attach the following connectors to the engine:

      EGR VSV connector
      EGR gas temperature sensor connector
      ECT sensor connector
      Oil pressure sensor connector
      Compressor connector, if equipped with air conditioning

    10. Install or connect the following:

      Throttle body
      Spark plug wires, to the spark plugs
      No. 1 and No. 2 PCV hoses
      Air conditioning idle up valve, if equipped with air conditioning
      Air intake connector, by installing the 2 bolts, hose clamp and 2 air hoses
      Accelerator cable, if equipped with a manual transaxle
      Throttle and accelerator cables, if equipped with an automatic transaxle
      MAF meter, resonator and the air cleaner cap
      Negative battery cable

    11. Refill the cooling system.
    12. Start the engine and check for leaks.
    13. Check the ignition timing. Road test the vehicle for proper operation.
    14. Recheck all fluid levels.

    5vz-FE Engine
    1. Before servicing the vehicle, refer to the Precautions Section.
    2. Disconnect the negative battery cable.
    3. Relieve the fuel system pressure.
    4. Drain the engine coolant.
    5. Remove or disconnect the following:

      Spark plug wires from the spark plugs
      Air cleaner cap
      Mass Air Flow (MAF) meter and resonator
      Actuator cable with the bracket, if equipped with cruise control
      Accelerator cable
      Throttle cable, if equipped with an automatic transmission
      Exhaust Gas Recirculation (EGR) pipe and gaskets, if equipped with an EGR valve
      Oil filler tube and No. 1 throttle cable clamp, by removing the bolt and 2 nuts
      Intake chamber stay, by removing the 2 bolts
      Vacuum Switching Valve (VSV) connector, for the fuel pressure control
      Throttle Position (TP) sensor connector
      Idle Air Control (IAC) valve connector
      EGR gas temperature connector, if equipped with an EGR valve
      VSV connector for the EGR valve, if equipped with an EGR valve
      Disconnect the Positive Crankcase Ventilation (PCV) hoses
      Water bypass hoses
      Air assist hose from the intake air connector
      2 vacuum sensing hoses from the VSV
      Evaporative Emission (EVAP) hose
      Air hose from the power steering
      Air hose from the air conditioning idle up valve, if equipped with air conditioning
      Air intake chamber assembly
      Engine wiring harness from the intake air connector
      2 fuel return hoses
      Brake booster vacuum hose, from the intake air connector
      Ground strap, from the intake air connector
      Data Link Connector 1 (DLC1) from the intake air connector bracket
      Idle up valve connector, if equipped with air conditioning
      Intake air connector
      Upper radiator hose, from the engine
      Oil pressure sensor connector
      Crankshaft Position (CKP) sensor connector
      6 injector connectors
      Engine Coolant Temperature (ECT) sender gauge connector
      ECT sensor connector
      Knock (KS) sensor connector
      Camshaft Position (CMP) sensor connector
      3 engine wiring harness clamps
      Engine wiring harness, from the cylinder head
      Fuel pressure regulator
      Heater hose
      Camshaft Position sensor.
      Fuel inlet hose
      Intake manifold stay
      Intake manifold assembly


    To install:

    1. Clean all surfaces.
    2. Install or connect the following:

      New gaskets
      Intake manifold assembly. Tighten the bolts and nuts to 13 ft. lbs. (18 Nm).
      Intake manifold stay. Tighten the bolts to 13 ft. lbs. (18 Nm).
      Fuel inlet hose
      CMP sensor. Tighten it to 71 inch lbs. (8 Nm).
      Engine wiring harness to the cylinder head
      3 engine wiring harness clamps
      Oil pressure sensor connector
      CKP sensor connector
      6 injector connectors
      ECT sender gauge connector
      ECT sensor connector
      KS sensor connector
      CMP sensor connector
      Heater hose
      Intake manifold. Tighten the bolts and nuts to 14 ft. lbs. (18.5 Nm).
      DLC1 to the bracket on the intake manifold
      Ground strap to the intake manifold
      Brake booster vacuum hose, to the intake air connector
      2 fuel return hoses
      Engine wiring harness to the intake manifold
      Idle up valve connector, if equipped with air conditioning
      Air intake chamber assembly to the engine. Tighten the bolts and nuts to 14 ft. lbs. (18.5 Nm).
      PCV hoses
      Water bypass hoses
      Air assist hose to the intake manifold
      2 vacuum sensing hoses to the VSV
      EVAP hose
      Air hose to the power steering
      Air hose to the air conditioning idle up valve, if equipped with air conditioning
      VSV connector for the fuel pressure control
      TP sensor connector
      IAC valve connector
      EGR gas temperature connector, if equipped with an EGR valve
      VSV connector for the EGR valve, if equipped with an EGR valve
      Intake chamber stay. Tighten the bolts to 30 ft. lbs. (40 Nm).
      New O-ring to the oil filler tube
      Oil filler tube end into the tube hole in the oil pan
      Oil filler tube and No. 1 throttle cable clamp
      New gaskets and the EGR pipe. Tighten the clamp nuts to 71 inch lbs. (8 Nm) and the EGR pipe nuts to 14 ft. lbs. (18 Nm).
      Fuel pressure regulator
      3 clamps for the spark plug wires, to the No. 2 timing belt cover
      CMP connector to the No. 2 timing belt cover
      Upper radiator hose

    3. Fill with engine coolant.
    4. Install or connect the following:

      Spark plug wires to the spark plugs
      Actuator cable with the bracket, if equipped with cruise control
      Accelerator cable
      Throttle cable, if equipped with an automatic transmission
      Air cleaner hose
      Negative battery cable

    5. Fill the radiator with engine coolant.
    6. Start the engine and check for leaks.
    -----------------------------------


    Idle Air Control Valve


    Testing



    2RZ-FE
    California Specification
    1. Check that the IAC valve is half open.
    2. Connect the IAC valve connector to the IAC valve.
    3. Disconnect the ECT sensor connector from the ECT sensor.
    4. Turn the ignition switch ON.
    5. Check that the IAC valve moves.
    6. Repeat connecting and disconnecting of IAC valve connector several times and check the operation of the valve.
    7. If operation is not as specified, replace the IAC valve.
    8. Turn the ignition switch OFF.
    9. Connect the ECT sensor connector to the ECT sensor.

      Click image to see an enlarged view

      Fig. Idle Air Control Valve


    Except California Specification
    1. Disconnect the IAC valve connector.
    2. Using an ohmmeter, measure resistance between terminal +B and the other (RSC, RSO) terminals.
    3. If resistance is not as specified, replace the IAC valve.

      Click image to see an enlarged view

      Fig. IAC valve terminal identification



      Click image to see an enlarged view

      Fig. Resistance table

    4. Connect the positive (+) lead from the battery to terminal +B and negative (-) to terminal RSC and check that the valve is closed.
    5. Connect the positive (+) lead from the battery to terminal +B and negative (-) to terminal RSO and check that the valve is open.

      Click image to see an enlarged view

      Fig. Checking IAC valve operation


    3RZ-FE
    California Specification
    1. Check that the IAC valve is half open.
    2. Connect the IAC valve connector to the IAC valve.
    3. Disconnect the ECT sensor connector from the ECT sensor.
    4. Turn the ignition switch ON.
    5. Check that the IAC valve moves.
    6. Repeat connecting and disconnecting of IAC valve connector several times and check the operation of the valve.
    7. If operation is not as specified, replace the IAC valve.
    8. Turn the ignition switch OFF.
    9. Connect the ECT sensor connector to the ECT sensor.

      Click image to see an enlarged view

      Fig. Idle Air Control Valve


    Except California Specification
    1. Disconnect the IAC valve connector.
    2. Using an ohmmeter, measure resistance between terminal +B and the other (RSC, RSO) terminals.
    3. If resistance is not as specified, replace the IAC valve.

      Click image to see an enlarged view

      Fig. IAC valve terminal identification



      Click image to see an enlarged view

      Fig. Resistance table

    4. Connect the positive (+) lead from the battery to terminal +B and negative (-) to terminal RSC and check that the valve is closed.
    5. Connect the positive (+) lead from the battery to terminal +B and negative (-) to terminal RSO and check that the valve is open.

      Click image to see an enlarged view

      Fig. Checking IAC valve operation


    5VZ-FE
    1. Connect the positive (+) lead from the battery to terminal +B and negative (-) lead to terminal RSC, and check that the valve is closed.
    2. Connect the positive (+) lead from the battery to terminal +B and negative (-) lead to terminal RSO, and check that the valve is open.
    3. If operation is not as specified, replace the IAC valve.

      Click image to see an enlarged view

      Fig. IAC valve testing


    -----------------------------------

    Mass Air Flow Meter


    Testing



    2.4L (2RZ-FE)
    1. Using an ohmmeter, measure the resistance between terminals THA and E2.
    2. If the resistance is not as specified, replace the MAF meter.

      Click image to see an enlarged view

      Fig. Terminals THA and E2



      Click image to see an enlarged view

      Fig. Temperature/resistance table

    3. Connect the MAF meter connector.
    4. Using a voltmeter, connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E3.
    5. Blow air into the MAF meter, and check that the voltage fluctuates.
    6. If operation is not as specified, replace the MAF meter.

      Click image to see an enlarged view

      Fig. Terminals VG and E3


    2.7L (3RZ-FE)
    1. Using an ohmmeter, measure the resistance between terminals THA and E2.
    2. If the resistance is not as specified, replace the MAF meter.

      Click image to see an enlarged view

      Fig. Terminals THA and E2



      Click image to see an enlarged view

      Fig. Temperature/resistance table

    3. Connect the MAF meter connector.
    4. Using a voltmeter, connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E3.
    5. Blow air into the MAF meter, and check that the voltage fluctuates.
    6. If operation is not as specified, replace the MAF meter.

      Click image to see an enlarged view

      Fig. Terminals VG and E3


    3.4L (5VZ-FE)
    1. Disconnect the MAF meter connector.
    2. Using an ohmmeter, measure the resistance between terminals THA and E2.
    3. If the resistance is not as specified, replace the MAF meter.

      Click image to see an enlarged view

      Fig. MAF terminals THA and E2



      Click image to see an enlarged view

      Fig. Resistance/temperature table

    4. Connect the MAF meter connector.
    5. Using a voltmeter, connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
    6. Turn the ignition switch ON.
    7. Blow air into the MAF meter, and check that the voltage fluctuates.
    8. If operation is not as specified, replace the MAF meter.

      Click image to see an enlarged view

      Fig. MAF terminals VG and E2G


    4.0L (1GR-FE)
    1. Apply battery voltage across terminals 1 (+B) and 2 (E2G).
    2. Connect the positive (+) tester prove to terminal 3 (VG), and negative (-) tester prove to terminal 2 (E2G).
    3. Blow air into the MAF meter, and check if the voltage fluctuates.
    4. If operation is not as specified, replace the MAF meter.

      Click image to see an enlarged view

      Fig. MAF Testing

    5. Using an ohmmeter, measure resistance between the terminals 4 (THA) and 5 (E2). Compare to values given in the illustration.
    6. If operation is not as specified, replace the MAF meter.
    ----------------------------

    Throttle Position Sensor


    Testing



    2.4L (2RZ-FE)
    1. Apply vacuum to the throttle opener.
    2. Insert a thickness gauge between the throttle stop screw and stop lever.
    3. Using an ohmmeter, measure the resistance between each terminal.

      Click image to see an enlarged view

      Fig. TPS testing



      Click image to see an enlarged view

      Fig. Resistance table


    2.7L (3RZ-FE)
    1. Apply vacuum to the throttle opener.
    2. Insert a thickness gauge between the throttle stop screw and stop lever.
    3. Using an ohmmeter, measure the resistance between each terminal.

      Click image to see an enlarged view

      Fig. TPS testing



      Click image to see an enlarged view

      Fig. Resistance table


    4.0L (1GR-FE)
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON.
    3. When turning the accelerator pedal position sensor lever to the full-open position, check that the percentage of throttle valve opening angle. Standard percentage of the valve opening angle: 60 % or more
    4. If operation is not as specified, check that the accelerator pedal position sensor, the wiring and the ECM.
    -------------------------


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