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                                                                                                                                           DI-37
                                                    DIAGNOSTICS         -   ENGINE
                                                                                                                                           DI6V0-02




    DTC                  P0120                Throttle Position Sensor/Switch "A"
                                              Circuit Malfunction

CIRCUIT DESCRIPTION
                                                           The throttle position sensor is mounted in the throttle body and
                                                           detects the throttle valve opening angle. When the throttle valve
                                                           is fully closed, a voltage of approximately 0.3 - 0.8 V is applied
   Throttle Position                    ECM                to terminal VTA of the ECM. The voltage applied to the termi-
   Sensor
                                                           nals VTA of the ECM increases in proportion to the opening
                              VC                           angle of the throttle valve and becomes approximately 3.2 - 4.9
                             VTA                           V when the throttle valve is fully opened. The ECM judges the
                                                           vehicle driving conditions from this signal input from terminal
                               E2                          VTA, and uses it as one of the conditions for deciding the air-
                                                           fuel ratio correction, power increase correction and fuel-cut
                                                           control etc.



                                                P24296




  DTC No.                           DTC Detecting Condition                                                     Trouble Area
               Condition (a) or (b) continues with more than 5 sec.:                 S Open or short in throttle position sensor circuit
   P0120       (a) VTA < 0.1 V                                                       S Throttle position sensor
               (b) VTA > 4.9 V                                                       S ECM
HINT:
After confirming DTC P0120, use the OBD II scan tool or TOYOTA hand-held tester to confirm the throttle
valve opening percentage.

                              Throttle valve opening position
                                expressed as percentage                                                                Trouble Area
      Throttle valve fully closed                        Throttle valve fully open
                                                                                                                      VC line open
                 0%                                                0%
                                                                                                                  VTA line open or short

            Approx. 100 %                                     Approx. 100 %                                            E2 line open




2002 ECHO (RM884U)

                                                                                      Author :                       Date :                207
DI-38
                                             DIAGNOSTICS   -    ENGINE

WIRING DIAGRAM
              T2
              Throttle Position Sensor                                                         ECM


                                                                                                 5V
                                                                                     1
                                         1                     R-W                       VC
                                                                                    E6


                                                                                    11
                                         3                     Y-R                       VTA
                                                                                    E6


                                                                                    9
                                         2                     BR                        E2
                                                                                    E6

                                                                                                 E1



                                                                                                        A00311



INSPECTION PROCEDURE
HINT:
S       If DTC P0110 (Intake Air Temp. Circuit Malfunction), P0115 (Engine Coolant Temp. Circuit Malfunc-
        tion), P0120 (Throttle/Pedal Position Sensor/Switch "A" Circuit Malfunction) are output simultaneous-
        ly, E2 (sensor ground) may be open.
S       Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame
        records the engine conditions when the malfunction is detected, when troubleshooting it is useful for
        determining whether the vehicle was running or stopped, the engine warmed up or not, the air-fuel
        ratio lean or rich, etc. at the time of the malfunction.




2002 ECHO (RM884U)

                                                                         Author :              Date :   208
                                                                                                              DI-39
                                       DIAGNOSTICS   -   ENGINE



   1     Connect the OBD II scan tool or TOYOTA hand-held tester, read the throttle
         valve opening percentage.

                                             PREPARATION:
                                             (a) Connect the OBD II scan tool or TOYOTA hand-held tes-
                                                 ter to DLC3.
                                             (b) Turn the ignition switch ON and push the OBD II scan tool
                                                 or TOYOTA hand-held tester main switch ON.
                                             CHECK:
                                             Read the throttle valve opening percentage.
                                             OK:
                                    FI7052                                       Throttle valve opening position
                                                         Throttle valve
                                                                                   expressed as percentage

                                                          Fully open                     Approx. 70 %
                                                         Fully closed                    Approx. 10 %


                                               OK        Check for intermittent problems
                                                         (See page DI-3 ).


  NG



   2     Check voltage between terminal VC of throttle position sensor connector and
         body ground.

                                             PREPARATION:
         ON                 2 (+)
                                             (a) Disconnect the throttle position sensor connector.
                                             (b) Turn the ignition switch ON.
                                             CHECK:
                                             Measure voltage between terminal 2 of the throttle position con-
                                             nector and body ground.
                                             OK:
                                                  Voltage: 4.5 - 5.5 V
BE6653
A01842                          A02264

                                               NG         Go to step 5.


  OK




2002 ECHO (RM884U)

                                                                  Author :         Date :                      209
DI-40
                                           DIAGNOSTICS     -    ENGINE



   3        Check throttle position sensor (See page SF-32 ).

                                                PREPARATION:
                Throttle Position Sensor        Disconnect the throttle position sensor connector.
                                                CHECK:
        3                                       Measure resistance between terminals 1, 3 and 2 of the throttle
        2                                       position sensor.
                                                OK:
        1
                                                         Terminals                   Throttle valve            Resistance k
                                                           1-2                                                    2.5 - 5.9
                                       A01843
                                                                                     Fully closed                 0.2 - 5.7
                                                           1-3
                                                                                      Fully open                 2.0 - 10.2


                                                  NG            Replace throttle position sensor.


  OK



   4        Check voltage between terminals VTA and E2 of ECM connector.

        ON                                      PREPARATION:
                                                (a) Remove the connector cover from the ECM.
                                                (b) Turn the ignition switch ON.
                                                CHECK:
                                                Measure voltage between terminals VTA and E2 of the ECM
                                                connector.
        VTA                           E2        OK:
                       (+)      (-)
                                                               Throttle valve                              Voltage
                                       A09036
                                                               Fully closed                               0.3 - 1.0 V
                                                                Fully open                                3.2 - 4.9 V


                                                  NG           Check for open and short in harness and con-
                                                               nector between ECM and throttle position sen-
                                                               sor (VTA or E2 line) (See page IN-29 ).


  OK



  Check and replace ECM (See page IN-29 ).




2002 ECHO (RM884U)

                                                                          Author :                    Date :                  210
                                                                                              DI-41
                                     DIAGNOSTICS   -   ENGINE



  5         Check voltage between terminals VC and E2 of ECM connector.

            ON                             PREPARATION:
                                           (a) Remove the connector cover from the ECM.
            VC
                                           (b) Turn ignition switch ON.
                                           CHECK:
                                           Measure voltage between terminals VC and E2 of the ECM
                                           connector.
                                           OK:
                             E2                 Voltage: 4.5 - 5.5 V
                 (+)   (-)
   BE6653
   P23813                         A00252



                                             NG        Check and replace ECM (See page IN-29 ).


  OK



 Check for open in harness and connector be-
 tween ECM and sensor (VC line)
 (See page IN-29 ).




2002 ECHO (RM884U)

                                                            Author :          Date :              211



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