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DI-186
                                                        DIAGNOSTICS      -    AUTOMATIC TRANSMISSION
                                                                                                                                                  DI0SV-22




    DTC                  P0753                 Shift Solenoid "A" Electrical


    DTC                  P0758                 Shift Solenoid "B" Electrical

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

                                                   SHIFT SOLENOID No. 1              SHIFT SOLENOID No. 2                 BOTH SOLENOIDS
                      NORMAL
                                                   MALFUNCTIONING                    MALFUNCTIONING                       MALFUNCTIONING
   Position    Solenoid valve                     Solenoid valve                     Solenoid valve                     Gear when shift selector is
                                      Gear                        Gear                               Gear
               No. 1     No. 2                    No. 1    No. 2                     No. 1     No. 2                    manually operated
                ON       OFF          1st          X        ON    3rd                 ON       X     1st                           O/D
                ON        ON          2nd           X        ON         3rd         OFF         X         O/D                      O/D
      D
                OFF       ON          3rd           X        ON         3rd          OFF        X         O/D                      O/D
                OFF      OFF          O/D           X        OFF        O/D          OFF        X         O/D                      O/D
                ON       OFF          1st           X        ON         3rd          ON         X          1st                     3rd
      2         ON        ON          2nd           X        ON         3rd          OFF        X          3rd                     3rd
                OFF       ON          3rd           X        ON         3rd          OFF        X          3rd                      3rd
                ON       OFF          1st           X        OFF        1st          ON         X          1st                     1st
      L
                ON        ON          2nd           X         ON        2nd          ON         X          1st                     1st

    X: Malfunctions
HINT:
Check the shift solenoid valve No. 1 when DTC P0753 (Shift Solenoid "A" Electrical) is output and check the
shift solenoid valve No. 2 when DTC P0758 (Shift Solenoid "B" Electrial) 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 or No. 2 circuit when it changes.
               The ECM records DTC P0753 or P0758 if condition 1. or 2. is
               detected once, but it does not light up MIL.
               After ECM detects condition 1. or 2. continuously 8 times or
               more in one-trip, it causes the MIL light up until condition 1. or   S Open or short in shift solenoid valve No. 1/No. 2 circuit
   P0753
               2. disappears.                                                       S Shift solenoid valve No. 1/No. 2
   P0758
               After that, if the ECM detects condition 1. or 2. once, it starts    S ECM
               lighting up MIL again.
               1. Solenoid resistance is 8  or less (short circuit) when the
                   solenoid is energized.
               2. Solenoid resistance is 100 k or more (open circuit) when
                   the solenoid is not energized.




 2002 4RUNNER (RM887U)

                                                                                       Author :                       Date :                        362
                                                                                                        DI-187
                                           DIAGNOSTICS      -   AUTOMATIC TRANSMISSION

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

WIRING DIAGRAM

                                                                                          ECM
                         Transmission

                         Shift Solenoid
                         Valve No. 1                                             3
                                       W         4          P-L
                                                                             E9      S1


                          Shift Solenoid
                          Valve No. 2
                                                                                 2
                                      B          8          L-W
                                                                             E9      S2



                                                                                                          D10503




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.
                                                     OK:
                                                          Resistance: 11 - 15  at 20



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