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cip0753p


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DI-174
                                                         DIAGNOSTICS         -     AUTOMATIC TRANSAXLE
                                                                                                                                                       DI6UM-02




  DTC                 P0753, P0758                             Shift Solenoid A/B Electrical Malfunc-
                                                               tion (Shift Solenoid Valve No.1/No.2)

CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ON and OFF of the shift solenoid valve No. 1 and
No. 2 controlled by ECM. If an open or short circuit occurs in either of the solenoid valves, the ECM controls
the remaining normal solenoid valve to allow the vehicle to be operated smoothly (Fail safe function).

                                                      SHIFT SOLENOID VALVE               SHIFT SOLENOID VALVE              BOTH SHIFT SOLENOID
                           NORMAL                     NO. 1 MALFUNCTIONING               NO. 2 MALFUNCTIONING              VALVES MALFUNCTIONING
    Range
                  Solenoid valve                     Solenoid valve                      Solenoid valve                     Gear when shift selector is
                                         Gear                               Gear                               Gear         manually operated
                  No. 1     No. 2                    No. 1     No. 2                     No. 1     No. 2
                   ON       ON           1st          X        OFF           3rd          ON        X           2nd                     3rd
                   ON        OFF         2nd            X        OFF         3rd          ON          X         2nd                     3rd
      D
                   OFF       OFF         3rd            X        OFF         3rd          OFF         X         3rd                     3rd
                   OFF       ON          O/D            X        ON         O/D           OFF         X         3rd                     3rd
                   ON        ON          1st            X        OFF         3rd          ON          X         2nd                     3rd
      2            ON        OFF         2nd            X        OFF         3rd          ON          X         2nd                     3rd
                   OFF       OFF         3rd            X        OFF         3rd          OFF         X         3rd                     3rd
                   ON        ON          1st            X        OFF         3rd          ON          X         2nd                     3rd
      L
                   ON        OFF         2nd            X        OFF         3rd          ON          X         2nd                     3rd
         X: Malfunctions



HINT:
Check the sift solenoid valve No. 1 when DTC P0753 is output and check the shift solenoid valve No. 2 when
DTC P0758 is output.
   DTC No.                            DTC Detecting Condition                                                      Trouble Area
                  The ECM checks for an open or short circuit in the shift sole-
                  noid valve No. 1/No. 2 circuit when it changes.
                  The ECM records DTC P0753 or P0758 if condition (a) or (b) is
                  detected once, but it does not blink the MIL
                  After ECM detects condition (a) or (b) continuously 2 times or
                  more in 1-trip, it causes the MIL to light up until condition (a) or
                                                                                         S Open or short in shift solenoid valve No. 1/No. 2 circuit
   P0753          (b) disappears.
                                                                                         S Shift solenoid valve No. 1/No. 2
   P0758          After that, if the ECM detects condition (a) or (b) once, it starts
                                                                                         S ECM
                  lighting up MIL again.

                  (a) Solenoid resistance is 8  or less (short circuit) when the
                  solenoid is energized.
                  (b) Solenoid resistance is 100 k or more (open circuit) when
                  the solenoid is not energized.

Fail safe function:
If either of the solenoid valve circuits develops an open or short, the ECM turns the other solenoid valve ON
and OFF to shift to the gear positions shown in the table above. The ECM also turns the shift solenoid valve
ST OFF at the same time. If both solenoids malfunction, hydraulic control cannot be performed electronically
and must be done manually.
Manual shifting as shown in the above table must be done (In the case of a short circuit, the ECM stops send-
ing current to the short circuited solenoid).


 2002 ECHO (RM884U)

                                                                                            Author :                      Date :                         344
                                                                                                  DI-175
                                         DIAGNOSTICS   -   AUTOMATIC TRANSAXLE

WIRING DIAGRAM



                     Transaxle                                                      ECM

                     Shift Solenoid
                     Valve No. 1
                                        5                                   3
                                                       W-G
                                       E1                                   E5 S1
                                 W

                     Shift Solenoid
                     Valve No. 2    10                                       9
                                                       W-R
                                    E1                                      E5 S2
                                B




                                                                                                    D07912



INSPECTION PROCEDURE

  1     Measure resistance between terminal S1 or S2 of ECM and body ground.

                                               PREPARATION:
                                               Disconnect the connector from ECM.
                                               CHECK:
                                               Measure resistance between terminal S1 or S2 of ECM and
                                               body ground.
                            S1                 OK:
                            S2                      Resistance: 11 - 15  at 20 



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