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                                                    DIAGNOSTICS     -   AUTOMATIC TRANSMISSION (A750E/A750F for                         DI-1221
                                                                        2UZ-FE)
                                                                                                                                          DIDWV-01




    DTC                    P0781             1-2 Shift (1-2 Shift Valve)

 Valve Body:                     1-2 Shift Valve         SYSTEM DESCRIPTION
                                                         The 1-2 shift valve performs shifting to 1st gear and other
                                                         gears.




                                               D14169


   DTC No.                        DTC Detection Condition                                               Trouble Area

                The gear required by the ECM does not match the actual gear    S Valve body is blocked up or stuck (1-2 shift valve)
   P0781
                when driving (2-trip detection logic)                          S Automatic transmission (clutch, brake or gear, etc.)


MONITOR DESCRIPTION
This DTC indicates that the 1-2 shift valve in the valve body is locked in the direction the spring compresses.
The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF" and switching oil pressure
to the valves in the valve body.
The ECM calculates the "actual" transmission gear by comparing the signals from the input speed sensor
(NCO) and the output speed sensor (SP2). The ECM can detect many mechanical problems in the shift sole-
noids, valve body, and the transmission clutches, brakes, and gears. If the ECM detects that the actual gear
position and the commanded gear position are different, it will illuminate the MIL and store the DTC .

MONITOR STRATEGY
           Related DTCs                          P0781            Valve body/Rationality check
                                                 Main             Valve body
  Required sensors/Components                                     Automatic transmission assembly, Speed sensor (NT), Speed sensor
                                                 Sub
                                                                  (NO), Vehicle speed sensor, Throttle speed sensor
     Frequency of operation         Continuous
                                    Conditions (A) and (B)        0.4 sec.

             Duration               Condition (C)                 3 sec.
                                    Condition (D)                 0.5 sec.
           MIL operation            2 driving cycles
      Sequence of operation         None
DI-1222                                          DIAGNOSTICS        -   AUTOMATIC TRANSMISSION (A750E/A750F for
                                                                        2UZ-FE)

TYPICAL ENABLING CONDITIONS
                                                                                     Specification
                     Item
                     It
                                                            Minimum                                           Maximum
All:
Turbine speed sensor circuit                                                   Not circuit malfunction
Output speed sensor circuit                                                    Not circuit malfunction
Shift solenoid valve S1 circuit                                                Not circuit malfunction
Shift solenoid valve S2 circuit                                                Not circuit malfunction
Shift solenoid valve SR circuit                                                Not circuit malfunction
Shift solenoid valve SL1 circuit                                               Not circuit malfunction
Shift solenoid valve SL2 circuit                                               Not circuit malfunction
ECT (Engine coolant temperature) sensor
                                                                               Not circuit malfunction
circuit

KCS sensor circuit                                                             Not circuit malfunction
ETCS (Electric throttle control system)                                          Not system down
Transmission range                                                                       "D"
ECT                                                  40

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