3239531 - E7050 AUTOMATIC TRANSMISSION - Functional description (Q-System)

Functional description

The control unit of the AISIN electronic automatic transmission M55 monitors and governs the entire automatic transmission management system. The control unit is supplied directly by the battery via the line of maxifuse O/A located on the battery (connector B99 D ), at pin 12 of connector A of M55 . The supply controlled by the ignition (15/54) arrives at pin 25 of connector A of M55 from the line protected by fuse B42 . Pins 2 and 8 of connector A of M55 are earthed. The control unit M55 is connected to the selector lever position sensor located on the gearbox (unit L50 , connector A): the unit receives an ignition-controlled supply (INT) at pin 9, while pin 10 is earthed. From pins 3, 5, 8 and 11 of L50 connector A emerge the signals corresponding to P, D, N and R respectively, which are connected to control unit M55 , at pins 3 and 16 of connector A and 7 and 16 of connector B. Pin 2 of L50 connector A gives a safety signal (gear in N or P) for the starting enablement relay J05 which gives the starting enablement: pin 50 of the starter motor A20 See E5010  STARTING AND RECHARING .

The control unit M55 - connector A - also connects to the solenoid unit L50 - connector B - which contains the control valves, pressure regulator and some sensors:

  • the solenoid control signals come from pin 13 (for the gear change solenoid L1), pin 26 (for the gear change solenoid L2), pin 26 (for the torque converter lock solenoid L-UP) and pin 15 (for solenoid E/B);
  • pin 11 of connector A of M55 supplies the pressure control solenoid, whose control signal comes from pin 1 of connector A of M55 ;
  • pins 5 and 18 of connector A of M55 connect to the oil temperature sensor located next to the solenoids in L50 .
Pins 4 and 12 of connector B M55 are connected to the car speed sensor (gearbox output) K77 ; Pins 3 and 11 of connector B M55 are connected to the gearbox speed input sensor K78 ; pin 2 of connector B M55 provides the signal screening earth. Pin 9 of connector A of M10 receives the signal coming from the brake lights switch I30 , with the supply controlled by the ignition (INT) from fuse F1 of the junction unit B1 See E2021  BRAKE LIGHTS . This signal controls the locking of the torque converter (L-UP). The gear controls assembly H37 receives an ignition-controlled supply (15/54) and is connected to the control unit M55 to indicate the gear engagement request: these signals are sent to pins 13, 8, 10, 15 and 14 of connector A of M55 ; pin 7 of the connector A of
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