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DI-1058
                                                   DIAGNOSTICS        -   AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
                                                                                                                            DIDVL-01




    DTC                    P0973             Shift Solenoid "A" Control Circuit Low
                                             (Shift Solenoid Valve S1)


    DTC                    P0974             Shift Solenoid "A" Control Circuit High
                                             (Shift Solenoid Valve S1)

CIRCUIT DESCRIPTION
Shifting from 1st to 5th is performed in combination with "ON" and "OFF" operation of the shift solenoid valves
SL1, SL2, S1, S2 and SR which are controlled by the ECM. If an open or short circuit occurs in either of the
shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be
operated smoothly (See page DI-985).
   DTC No.                        DTC Detection Condition                                                 Trouble Area
                                                                               S Short in shift solenoid valve S1 circuit
                ECM detects short in solenoid valve S1 circuit 2 times when
   P0973                                                                       S Shift solenoid valve S1
                solenoid valve S1 is operated (1-trip detection logic)
                                                                               S ECM
                                                                               S Open in shift solenoid valve S1 circuit
                ECM detects open in solenoid valve S1 circuit 2 times when
   P0974                                                                       S Shift solenoid valve S1
                solenoid valve S1 is not operated (1-trip detection logic)
                                                                               S ECM


MONITOR DESCRIPTION
These DTCs indicate an open or short in the shift solenoid valve S1 circuit. When there is an open or short
circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores
the DTC. When the shift solenoid valve S1 is on, if resistance is 8  or less, the ECM determines there is
a short in the shift solenoid valve S1 circuit.
When the shift solenoid valve S1 is off, if resistance is 100 k or more, the ECM determines there is an open
in the shift solenoid valve S1 circuit (See page DI-985).

MONITOR STRATEGY
                                                 P0973              Shift solenoid valve S1/Range check (Low resistance)
           Related DTCs
           R l t d DTC
                                                 P0974              Shift solenoid valve S1/Range check (High resistance)
  Required sensors/Components       Shift solenoid valve S1
     Frequency of operation         Continuous
             Duration               0.064 sec.
           MIL operation            Immediate
      Sequence of operation         None
                                                                                                                            DI-1059
                                                   DIAGNOSTICS   -   AUTOMATIC TRANSMISSION (A750E for 1GR-FE)

TYPICAL ENABLING CONDITIONS
                                                                               Specification
                   Item
                   It
                                                          Minimum                                        Maximum
The monitor will run whenever these
                                                                              See page DI-963
DTCs are not present.

Range check (Low resistance)
Shift solenoid valve S1                                                            ON
Range check (High resistance)
Shift solenoid valve S1                                                            OFF


TYPICAL MALFUNCTION THRESHOLDS
                     Detection criteria                                                  Threshold
Range check (Low resistance)
Shift solenoid valve S1 resistance                                                       8  or less
Range check (High resistance)
Shift solenoid valve S1 resistance                                                    100 k or more


COMPONENT OPERATING RANGE
                          Parameter                                                   Standard value
Shift solenoid valve S1                                                     Resistance: 11 to 15  at 20



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