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                                                                                                                              DI-167
                                                 DIAGNOSTICS     -   AUTOMATIC TRANSAXLE
                                                                                                                               DI6UP-01


CIRCUIT INSPECTION

    DTC                P0500               Vehicle Speed Sensor Malfunction

CIRCUIT DESCRIPTION
The vehicle speed sensor outputs a 4-pulse signal for every revolution of the transaxle output shaft.
After this signal is converted into a more precise rectangular wave form by the wave form shaping circuit
inside the combination meter, it is then transmitted to the ECM.


                                     4-Pulse                                        4-Pulse

       Vehicle
       Speed Sensor




                                                           Combination Meter

                                                                                                      ECM



                            Transaxle
                                                                                                                                D06036




  DTC No.                       DTC Detecting Condition                                            Trouble Area
             No vehicle speed sensor signal to ECM under condition (1)   S Combination meter
             and (2); (2-trip detection logic)                           S Open or short in vehicle speed sensor circuit
   P0500     1. Park/neutral position switch is OFF                      S Vehicle speed sensor
             2. Vehicle is being driven                                  S ECM
             Clutch or brake slips or gear is broken                     S Automatic transaxle (clutch, brake or gear etc,)


WIRING DIAGRAM

                                                                                                                   ECM
     Combination Meter


                                              Instrument Panel J/B
                      19                         6              3                                       9
                                V-W                                             V-W
                     C14                         1F             1H                                      E4 SPD




                                                                                                                                D07932




2002 ECHO (RM884U)

                                                                          Author :                      Date :                 337
DI-168
                                       DIAGNOSTICS   -   AUTOMATIC TRANSAXLE

INSPECTION PROCEDURE

   1     Check operation of speedometer.

HINT:
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 was warmed up or not, the air-fuel ratio was lean
or rich, etc. at the time of the malfunction.
CHECK:
Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.
HINT:
The vehicle speed sensor is operating normally if the speedometer display is normal.

                                               NG        Check speedometer (See page BE-2 ).


  OK



   2     Check for short in harness and connector between terminal SPD of ECM connec-
         tor and body ground.

                                             PREPARATION:
                                             Disconnect the connector of the ECM.
                                             CHECK:
                                             Check continuity between terminal SPD of the ECM connector
            SPD                              and body ground.
                                             OK:
                                                  No continuity (1M  or higher)

                                    D08010     NG        Repair or replace harness or connector.


  OK




2002 ECHO (RM884U)

                                                               Author :           Date :            338
                                                                                                  DI-169
                                      DIAGNOSTICS   -   AUTOMATIC TRANSAXLE



  3     Check voltage between terminal SPD of ECM connector and body ground.

       ON                                   PREPARATION:
                     SPD
                                            Turn ignition switch ON.
                                            CHECK:
                                            Measure voltage between terminal SPD of ECM connector and
                                            body ground.
                                            OK:
                     (-)     (+)                  Voltage: 10 - 14 V

                                   D05680     NG        Check for open in harness and connector be-
                                                        tween instrument panel J/B and ECM
                                                        (See page IN-29 ).


  OK



  4     Check for open in harness and connector between instrument panel J/B and
        combination meter (See page IN-29 ).


                                              NG        Repair or replace harness or connector.




  5     Check ECM (See page IN-29 ).


                                              NG        Replace ECM.


  OK



 Check and repair transaxle (clutch, brake or
 gear etc,).




2002 ECHO (RM884U)

                                                              Author :          Date :             339



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