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                                                                                                                                           DI-129
                                                    DIAGNOSTICS           -     ENGINE
                                                                                                                                             DI6VM-02




    DTC                   P1520               Stop Light Switch Signal Malfunction
                                              (Only for A/T)

CIRCUIT DESCRIPTION
This signal is used to detect when the brakes have been applied. The STP signal voltage is the same as
the voltage supplied to the stop lights.
The STP signal is used mainly to control the fuel cut-off engine speed (The fuel cut-off engine speed is re-
duced slightly when the vehicle is braking.).
   DTC No.                        DTC Detecting Condition                                                        Trouble Area
               The stop light switch does not turn off even once the vehicle is       S Short in stop light switch signal circuit
   P1520       driven                                                                 S Stop light switch
               (2 trip detection logic)                                               S ECM

WIRING DIAGRAM


                     S4                                                                                                             Engine ECU
                     Stop Light Switch                 Instrument Panel J/B
                                                          2            2                             15                       6
             G-B      2           1    G-W                                  G-W                                  G-W
                                                         1B           1H                             IE2                     E7     STP

                                                             3 1T

                                                                      G-W
                                                                      C
                                                          J10                                  G-W
                   Instrument Panel J/B                   J/C                                 C
                                                                      C                   C
                8         STOP           1
               1B                        1C
                                                                      G-W                 G-W

                                                                 1            R6      1                  1
                                                  1                                           R7                 H7
                                                B*                            Stop            Stop               High Mounted
                                                  *2                          Light           Light              Stop Light
                                              B-G                6            LH      6       RH         2

                     Fusible Link Block                                                   W-B
                                     4                                    W-B
                           ALT
                                    F6
                                                                                                   W-B
                                                                          W-B

         Battery                                                     BI                                    BG
                         *1: Puerto Rico
                         *2: Except Puerto Rico


    A09139                                                                                                                                   A14313




 2002 ECHO (RM884U)

                                                                                       Author :                        Date :                299
DI-130
                                        DIAGNOSTICS   -   ENGINE

INSPECTION PROCEDURE
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 warmed up or not, the air-fuel ratio lean or rich, etc.
at the time of the malfunction.

   1       Check operation of stop light.

PREPARATION:
Check if the stop lights go on and off normally when the brake pedal is operated and released.

                                                NG        Check and repair stop light circuit (See page
                                                          BE-37 ).


   OK



   2       Check STP signal.

         ON                                   When using TOYOTA hand-held tester:
          STP                                 PREPARATION:
                                              (a) Connect the to the DLC3.
                                              (b) Turn the ignition switch ON and TOYOTA hand-held tes-
                                                   ter main switch ON.
                                              CHECK:
                      (-)      (+)
                                              Read the STP signal on the TOYOTA hand-held tester.
                                              OK:
                                                   Brake pedal is depressed: STP ... ON
                                                   Brake pedal is released:     STP ... OFF
                                              When not using TOYOTA hand-held tester:
           Brake Pedal        Brake Pedal     PREPARATION:
           Depressed          Released
                                              (a) Remove the connector cover from the ECM.
                                              (b) Turn the ignition switch ON.
                                              CHECK:
                                              Check voltage between terminal STP of ECM and body ground.
                                              OK:
                                                          Brake pedal                      Voltage
                                     D05642
                                                          Depressed                      7.5 - 14 V
                                                           Released                      Below 1.5 V


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


   NG

 2002 ECHO (RM884U)

                                                                   Author :          Date :              300
                                                                                             DI-131
                                 DIAGNOSTICS   -   ENGINE



  3     Check harness and connector between ECM and stop light switch (See page
        IN-29 ).


                                        NG         Repair or replace harness or connector.


  OK



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




2002 ECHO (RM884U)

                                                         Author :          Date :             301



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