3239529 - 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) reaches pin 25 of connector A of M55 . 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 (15/54) at pin 9, while pin 10 is earthed. Pins 3, 5, 8 and 11 of L50 connector A send 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. Pins 1 and 4 of L50 connector A are connected to the reverse gear sensor, and they send signals to turn on the reversing light (  See E2022  REVERSING LIGHTS ). 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 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 sup
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