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                                                                                                                                   DI-193
                                                DIAGNOSTICS        -   AUTOMATIC TRANSAXLE
                                                                                                                                    DI6UF-02




    DTC               P1790                ST Solenoid Valve Circuit Malfunction

CIRCUIT DESCRIPTION
Shift solenoid valve ST is switched ON-OFF by a signal from ECM so that let in or out timing of 2nd brake
is adjusted by operating orifice control valve. Therefore, shift solenoid valve ST operates when letting in or
out reverse clutch.
If it is broken, the shift shock becomes big.
   DTC No.                     DTC Detecting Condition                                                  Trouble Area
             ECU memorizes DTC P1790 if (a) or (b) condition below is
             detected once or more, but ECU does not start MIL blinking.
                                                                              S Open or short in shift solenoid valve ST circuit
             (a) Solenoid resistance is 30  or lower (short circuit) when
   P1790                                                                      S Shift solenoid valve ST
             solenoid energized.
                                                                              S MIL
             (b) Solenoid resistance is 100 k or higher (open circuit) when
             solenoid is not energized.


WIRING DIAGRAM

         Transaxle                                                                                                  ECM

               Shift Solenoid
               Valve ST
                                    2                                                              2
                              Y                                 B-W
                                    E1                                                            E5 ST




                                                                                                                                    D07933




 2002 ECHO (RM884U)

                                                                               Author :                      Date :                 363
DI-194
                                    DIAGNOSTICS   -   AUTOMATIC TRANSAXLE

INSPECTION PROCEDURE

   1     Measure resistance between terminal ST of ECM and body ground.

                                          PREPARATION:
                                          Disconnect the connector from ECM.
                                          CHECK:
                                          Measure resistance between terminal ST of ECM and body
                                          ground.
                                          OK:
                           ST                  Resistance: 11 - 15  at 20 

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