E7040 Automatic clutch (ACS) – wiring diagram (page 2 of 2)

Control unit M85 controls and regulates the entire automatic clutch system. The control unit direct power supply arrives (pin 28) from the battery on the line protected by maxifuse EFI of B5 and by automatic clutch fusebox B52. The ignition switch power supply (15/54) arrives (pin 54) from the line protected byinjection and CODE memory fuse B35. Control unit pin 56 is earthed.

Engine control unit M85 receives the signals from the sensors.

The sensor on gear lever K91 is connected to pins 15 and 16 of M85, supplying information concerning the gear lever movements.

Sensors K92 and K93 are connected respectively to pins 11, 12, 39 and 13, 14, 41 of M85, supplying information on the gear inserted .

Sensor K94, through a potentiometer, detects the throttle position and informs control unit M85 through pins 5, 6 and 33.

Vehicle speed sensor K84 detects the car speed: it is supplied through the ignition switch (INT)by the line protected by fuse F21 of B1 and is connected to control unit M85 on pin 51.

Control unit M85, through power module N91 controls the clutch electric motor (pins 18, 19, 20 and 21 of M85).

Module N91 receives its power supply directly from the battery through the line protected by air conditioner/automatic clutch fuse B51.

Position sensor K95 supplies a feedback to the control unit concerning the actual position of the piston controlled by the engine. (connection to pins 7, 8 and 35 of M85).

Solenoid valve L40 is controlled by the control unit (pin 26) for clutch energising if there is a system failure.

The control unit safety and alarm logic receives the doors open signal (pin 4) frrom switches I16 and I17 (the same signals that switch on the front ceiling lamp) (see E2510 CEILING LAMPS).

Pin 25 of M85 sends a start enable signal to energise relay J81 that inhibits the power supply to the starter motor if the automatic clutch control unit logic does not send a consent. (see also E5010 STARTING AND RECHARGING).

In the case of an alarm the control unit commands the automatic clutch buzzer E45 through the signal from pin 50 of M85. The buzzer is supplied from the ignition switch power supply (INT) by the line protected by fuse F21 of B1.

E.i. control unit M10 sends a signal to pin 23 of M85 that is proportional to the engine revs.

The control unit has a diagnostics system that can be used by connecting it to electronic clutch diagnostic socket R21: this receives signals from pin 31 of M85.

The diagnostics systeml also generates the signal for the "ACS automatic clutch fault" warning light, on cluster E50, that is output from pin 17 of control unitM85.

Cluster E50 is fed by ignition switch power supply (INT) from the line protected by fuse F22 of junction unit B1.