Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Echo 2000-2002 Approved ileaf 02toyrm 02toypdf 02rmsour 2002 02echorm di eg cip1520

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                                                    DIAGNOSTICS           -     ENGINE

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

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


                     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

                                                          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

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

    A09139                                                                                                                                   A14313

 2002 ECHO (RM884U)

                                                                                       Author :                        Date :                299
                                        DIAGNOSTICS   -   ENGINE

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.

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 ).


   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.
                      (-)      (+)
                                              Read the STP signal on the TOYOTA hand-held tester.
                                                   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 voltage between terminal STP of ECM and body ground.
                                                          Brake pedal                      Voltage
                                                          Depressed                      7.5 - 14 V
                                                           Released                      Below 1.5 V

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


 2002 ECHO (RM884U)

                                                                   Author :          Date :              300
                                 DIAGNOSTICS   -   ENGINE

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

                                        NG         Repair or replace harness or connector.


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

2002 ECHO (RM884U)

                                                         Author :          Date :             301

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