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                                                                                                                                           DI-1037
                                                       DIAGNOSTICS      -   AUTOMATIC TRANSMISSION (A750E for 1GR-FE)
                                                                                                                                             DIDVH-01




       DTC                     P0771             Shift Solenoid "E" Performance
                                                 (Shift Solenoid Valve SR)

SYSTEM DESCRIPTION
The ECM uses signals from the output shaft speed sensor and input speed sensor to detect the actual gear
position (1st, 2nd, 3rd, 4th or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
problems of the shift solenoid valves, valve body or automatic transmission (clutch, brake or gear, etc.).
   DTC No.                            DTC Detection Condition                                                Trouble Area
                                                                                  S Shift solenoid valve SR remains open or closed
                    The gear required by the ECM does not match the actual gear   S Shift solenoid valve SL1 remains open or closed
       P0771
                    when driving (2-trip detection logic)                         S Valve body is blocked
                                                                                  S Automatic transmission (clutch, brake or gear, etc.)


MONITOR DESCRIPTION
This DTC indicates "stuck ON malfunction" or "stuck OFF malfunction" of the shift solenoid valve SR or SL1.
The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". When the gear position com-
manded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores
the DTC.

MONITOR STRATEGY
               Related DTCs                          P0771            Shift solenoid valve SR/Rationality check
                                                     Main             Shift solenoid valve SR
  Required sensors/Components
  R   i d         /C       t
                                                     Sub              Speed sensor (NT), Speed sensor (NO), Crankshaft position sensor (NE)
        Frequency of operation          Continuous
                                        OFF malfunction (A)           0.4 sec.

                 Duration               OFF malfunction (B) and (C)   Immediate
                                        ON malfunction                0.15 sec.
               MIL operation            2 driving cycles
        Sequence of operation           None


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
DI-1038
                                                   DIAGNOSTICS       -   AUTOMATIC TRANSMISSION (A750E for 1GR-FE)


ETCS (Electric throttle control system)                                            Not system down
Transmission range                                                                        "D"
ECT                                                    40



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