SFI SYSTEM, Diagnostic DTC:P2109

DTC Code DTC Name
P2109 Throttle / Pedal Position Sensor "A" Minimum Stop Performance

DESCRIPTION

The idling speed is controlled by the Electronic Throttle Control System (ETCS).

The ETCS is comprised of a throttle actuator, which operates the throttle valve, and a throttle position sensor, which detects the opening amount of the throttle valve.

The ECM controls the throttle actuator to adjust the throttle valve opening amount so that the idling speed is maintained at the target idling speed.

DTC No. DTC Detection Condition Trouble Area
P2109

The throttle air flow F/B value approaches its limit even though the actual intake air amount during idling is within the normal range (up to 1.5 times the normal amount)

(5 trip detection logic)

 Throttle with motor body assembly

Tech Tips


  • This malfunction is only detected once per trip. After it has been detected once, the system will not monitor for the malfunction for the rest of the trip.

  • This system is useful when the throttle with motor body assembly and the mass air flow meter are diagnosed and inspected.

MONITOR DESCRIPTION

If there are deposits in the throttle valve, a decrease in the ISC flow rate may cause engine stall and unstable idling. Therefore, the necessary ISC air flow rate for idling is maintained using the throttle air flow feedback. The ECM stores this DTC if the throttle air flow F/B value approaches its limit.

The ECM begins monitoring for the DTC detection conditions when the following preconditions are met: 1) the manifold absolute pressure sensor is normal; 2) atmospheric pressure is 85 kPa (638 mmHg) or higher; 3) the vehicle has been driven at a speed of 30 km/h (19 mph) or more at least once; and 4) the engine coolant temperature is 45°C (113°F) or less at engine start, the engine is warmed up and conditions for throttle air flow F/B value are met, or the ignition switch has been turned to ON (include engine running) for 1 hour or more, the engine is warmed up and conditions for throttle air flow F/B value are met.

CAUTION / NOTICE / HINT

Tech Tips


  • Read freeze frame data using the intelligent tester. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.

  • Since a pending DTC is not stored for this DTC, it takes time to confirm whether the malfunction has been successfully repaired by checking for this DTC. When confirming whether the malfunction has been successfully repaired, compare "Throttle Air Flow F/B Value" recorded in the freeze frame data with "Throttle Air Flow F/B Value" in the Data List after repairs have been made to save time.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2109)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P2109 is output A
      DTC P2109 and other DTCs are output B

      Tech Tips

      If any DTCs other than P2109 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK FREEZE FRAME DATA


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Using the intelligent tester, check "Throttle Air Flow F/B Value" in the freeze frame data Click here.

      Tech Tips

      Be sure to confirm "Throttle Air Flow F/B Value" in the freeze frame data as it is used when confirming whether the malfunction has been successfully repaired.


    NEXT

  3. REMOVE FOREIGN OBJECT (CLEAN THROTTLE WITH MOTOR BODY ASSEMBLY)


    1. Clean off any deposits from the inside of the throttle body.

      A005MCYE01
      Text in Illustration
      *1 Bore
      *2 Valve
      *a Reference
      *b Throttle Body Assembly Cross-section Diagram
      *c When valve fully opened
      *d Deposits
      *e Do not directly apply cleaner

      1. Push open the throttle valve and wipe off any carbon from the valve and bore using a cloth soaked in non-residue solvent.

        Note


        • Make sure that the cloth or your fingers do not get caught in the valve.

        • Make sure that foreign matter does not enter the throttle valve.

        • Do not directly apply non-residue solvent to the throttle body or wash the throttle body. Cleaning solvent may leak into the motor from the shaft and cause problems such as rust or valve movement problems.

        • If there is coating material on the edge of the valve, be careful not to remove it.

        • Push the throttle valve open gently with your finger and check that the throttle valve moves smoothly.

        Tech Tips

        If the throttle valve does not open smoothly, replace the throttle with motor body assembly.


    NEXT

  4. READ VALUE USING INTELLIGENT TESTER (THROTTLE AIR FLOW F/B VALUE)


    1. Perform "Inspection After Repairs" after cleaning or replacing the throttle with motor body assembly Click here.

    2. Using the intelligent tester, confirm "Throttle Air Flow F/B Value".

      OK
      The value is half of "Throttle Air Flow F/B Value" recorded in the freeze frame data or less.

    OK

    END

    NG

    REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY Click here