VARIABLE RESISTOR ON-VEHICLE INSPECTION


  1. REMOVE RADIATOR SUPPORT OPENING COVER


    1. A005RJS

      Remove the 9 clips and radiator support opening cover.

  2. INSPECT VARIABLE RESISTOR


    1. Disconnect the connector, and then remove the bolt and variable resistor.

    2. A00DRBI

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Always 3.5 to 6.5 Ω

      If the result is not specified, replace the variable resistor.

    3. A00DUFDE01

      Using SST, turn the idle mixture adjusting screw fully clockwise, and then measure the resistance according to the value(s) in the table below while turning the idle mixture adjusting screw fully counterclockwise using SST.

      SST
      09243-00020
      Standard Resistance
      Tester Connection Condition Specified Condition
      2 - 3 Always Changes from about 5 to 0 kΩ

      If the result is not specified, replace the variable resistor.

    4. Install the variable resistor with the bolt, and then connect the connector.

      Torque:
      13 N*m  { 130 kgf*cm, 9 ft.*lbf }

  3. INSPECT CO

    Tech Tips

    This check is used only to determine whether or not the idle CO complies with regulations.


    1. Initial condition:


      1. Engine at normal operating temperature

      2. Air cleaner installed

      3. All pipes and hoses of the air induction system connected

      4. All accessories switched off

      5. All vacuum lines properly connected

      6. SFI system wiring connectors fully seated

      7. Ignition timing set correctly

      8. Shift lever in N

      9. Tachometer and CO meter calibrated with engine idling

        Note

        If a CO meter is not available, do not attempt to adjust the idle mixture. Always use a CO meter when adjusting the idle mixture. It is unnecessary to use the idle mixture screw for adjustments if the vehicle is in good condition.

    2. Warm up the engine by driving at a constant speed (approximately 50 km/h (31 mph)). Release the accelerator pedal after the engine coolant temperature becomes stable (85 to 90°C (185 to 194°F)) and idle the engine for 5 minutes.

    3. Insert a tester probe at least 40 cm (1.31 ft) into the tailpipe.

    4. Wait at least 1 minute before measurement to allow the concentration to stabilize. Complete the measurement within 3 minutes.

      Idle CO concentration
      1.0 to 2.0%
    5. A00DS5ZE04

      If the CO concentration does not conform to regulations, adjust it by turning the idle mixture adjusting screw in the variable resistor with SST.

      SST
      09243-00020
    6. A00DPUWE01

      The idle mixture adjusting screw can be adjusted within a 180° range.

      Tech Tips


      • If the CO concentration is within the specification, this adjustment is complete.

      • If the CO concentration cannot be corrected by idle mixture adjustment, see the table below for other possible causes.

    7. Remove SST.

      CO Problems Causes
      High Rough idle (black smoke from exhaust)

      1. Clogged air filter

      2. Plugged ventilation valve

      3. Faulty SFI system:


        • Faulty fuel pressure regulator

        • Defective Engine Coolant Temperature (ECT) sensor

        • Faulty ECM

        • Faulty injectors

        • Faulty throttle body assembly

        • Faulty MAF meter

      4. Variable resistor circuit Click here

  4. INSTALL RADIATOR SUPPORT OPENING COVER


    1. A00DR1I

      Install the radiator support opening cover with the 9 clips.