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                                                DIAGNOSTICS        -   AUTOMATIC TRANSAXLE

    DTC              P1760                Linear Solenoid for Line Pressure Control
                                          Circuit Malfunction (Solenoid Valve SLT)

                                                       CIRCUIT DESCRIPTION
                                                       The throttle pressure that is applied to the primary regulator
                                                       valve (which modulates line pressure) causes the shift solenoid
Line Pressure Con-                                     valve SLT, under electronic control, to precisely and minutely
trol Pressure
                                                       modulate and generate line pressure according to the accelera-
                                                       tor pedal effort, or engine power output detected.
                                                       This reduces the function of line pressure and provides smooth
                                                       shifting characteristics.
            Current Flow to Solenoid D02290            Upon receiving the throttle valve opening angle signal, ECM
                                                       controls the line pressure by sending a predetermined (*) duty
                                                       ratio to the solenoid valve, modulating the line pressure, gener-
                                                       ating throttle pressure.
    ON                                                 (*) Duty Ratio
                                                       The duty ratio is the ratio of the period of continuity in one cycle.
                                                       For example, if A is the period of continuity in one cycle, and B
   OFF                                                 is the period of non-continuity, then
                1 cycle

                                                                          Duty Ratio =                     x 100 (%)
                                             BE4056                                            A+B

  DTC No.                      DTC Detecting Condition                                               Trouble Area
            (a) or (b) condition below is detected 1 second or more.       S Open or short in shift solenoid valve SLT circuit
   P1760    (a) SLT- terminal: 0V                                          S Shift solenoid valve SLT
            (b) SLT- terminal: 12V                                         S ECM
                                                       Refer to the chart for the wave form between terminals SLT+
                                       5 V/ Div.       and SLT- during engine idling.


            1 msec./Div.                     D01875

2002 ECHO (RM884U)

                                                                              Author :                      Date :                 356
                                    DIAGNOSTICS   -    AUTOMATIC TRANSAXLE


              Transaxle                                                               ECM
                               3                                             1
                          G                           W-L
                               E1                                            E5 SLT+

       Shift Solenoid
       Valve SLT

                                8                                            7
                          GR                           W                            -
                               E1                                            E5 SLT


2002 ECHO (RM884U)

                                                            Author :         Date :          357
                                       DIAGNOSTICS   -   AUTOMATIC TRANSAXLE


   1         Check shift solenoid valve SLT.

         1                     2
                                             (a) Jack up the vehicle.
                                             (b) Remove the oil pan.
                                             (c) Disconnect the solenoid connector.
                                             Check solenoid resistance:
                                             Measure resistance between terminals 1 and 2 of solenoid con-
                                    D03445   OK:
                                                  Resistance: 5.0 - 5.6  at 20 

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