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cip0770


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DI-178
                                                  DIAGNOSTICS       -   AUTOMATIC TRANSAXLE
                                                                                                                                    DI6UL-02




    DTC                P0770                Shift Solenoid E Malfunction
                                            (Shift Solenoid Valve SL)

SYSTEM DESCRIPTION
The ECM uses the signals from the throttle position sensor, air-flow meter and crankshaft position sensor
to monitor the engagement condition of the lock-up clutch.
Then the ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the
ECM memory to detect mechanical trouble of the shift solenoid valve SL, valve body and torque converter
clutch or automatic transaxle (clutch, brake or gear etc.).
  DTC No.                        DTC Detecting Condition                                                 Trouble Area
              S Lock-up does not occur when driving in the lock-up range
                (normal driving at 80 km/h [50 mph]), or lock-up remains ON    S Shift solenoid valve SL is stuck open or closed
                in the lock-up OFF range.                                      S Valve body blocked up or stuck
   P0770
                (2-trip detection logic)                                       S Lock-up clutch
              S When lock-up is ON, clutch or brake slips or gear is broken.   S Automatic transaxle (clutch, brake or gear etc.)
                (2-trip detection logic)

INSPECTION PROCEDURE

   1       Check solenoid valve SL operation

                                                        PREPARATION:
                                                        (a) Remove the oil pan.
                                                        (b) Remove the solenoid valve SL.
                                                        CHECK:
                                                        (a) Connect positive    lead to terminal of solenoid connec-
                                                            tor, negative   lead to terminal of solenoid connector.
                                                        (b) When battery positive voltage is supplied to the shift sole-
                                                            noid valve, check that the solenoid valve moves.
                                              D09032    OK:
                                                            (a) The solenoid makes an operating noise.
                                                            (b) Solenoid valve moves.

                                                            NG          Replace the solenoid valve SL.




  OK




2002 ECHO (RM884U)

                                                                                  Author :                     Date :                 348
                                                                                           DI-179
                                   DIAGNOSTICS   -   AUTOMATIC TRANSAXLE



  2     Check valve body (See page AX-9 ).


                                           NG        Repair or replace the valve body.


  OK




  3     Check the torque converter clutch (See page AX-34 ).


                                           NG        Repair the torque converter clutch.


  OK



 Repair the transaxle (See page AX-26 ).




2002 ECHO (RM884U)

                                                           Author :          Date :         349



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