21B-9
MR-413-X44-21B000$177.mif
V2
Vdiag No: 04SEQUENTIAL GEARBOX
Fault finding - System operation21B
Description of gear lever positions (continued):
–"+": moving the gear lever towards this position enables the driver to shift up,
–“-”: moving the gear lever towards this position will enable the driver to shift down.
Description of the display:
This display is specifically for the sequential gearbox. It displays 4 types of information for the driver:
–displays the gear selected: 1, 2, 3, 4, 5, N or R,
–the pictogram displaying AUTO mode: this pictogram lights up when AUTO mode is selected,
–the “depress brake pedal” symbol: this symbol lights up when a driver action requires the brake pedal to be
depressed if the driver is not depressing the brake pedal. This symbol only lights up when there is an error (driver
actions without depressing the brake pedal = symbol lighting up),
–the sequential gearbox fault warning light: this lights up when the sequential gearbox computer detects a fault on
the sequential gearbox system.
General information about the operation:
Operation in MANUAL mode:
Manual mode allows the driver to select gears by moving the gear lever. However, in manual mode, the driver is not
completely free to do what he/she likes. This is why this mode is also called semiautomatic mode because the driver
is still assisted by the sequential gearbox computer in the following instances:
–when driving, shifting the lever towards the “+” position may result in underspeed. As a result, the sequential
gearbox computer forbids the driver's request,
–when driving, shifting the lever towards the “-” position may result in engine overspeed. As a result, the sequential
gearbox computer forbids the driver's request,
–when driving, as the overspeed threshold is approached, the computer automatically selects a higher gear,
–when driving, as the underspeed threshold is approached, the computer automatically selects a lower gear,
–when driving, if the vehicle speed reduces too quickly (brakes applied), the sequential gearbox computer can
order a downshift. Reminder:
Creep is only possible in first or reverse gears; it makes parking manoeuvres easier: if the brake pedal or
the handbrake is released, the vehicle moves forward by itself, without the driver having to accelerate.
Creeping is not possible in second gear.
21B-12
MR-413-X44-21B000$177.mif
V2
Vdiag No: 04SEQUENTIAL GEARBOX
Fault finding - System operation21B
Depress brake pedal symbol:
–The “depress brake” symbol lights up when there is:
–a request to change gear when stopped without the brake pedal applied,
–a request to start the engine with gear engaged without brake pedal applied,
–a request to select N when driving without brake pedal applied,
–a request to select AUTO, with the vehicle stationary, the engine running and 2
nd gear engaged.
–Depress brake pedal symbol goes out:
The symbol goes out if the driver depresses the brake pedal or after a delay.
In the event that the driver makes a request causing the gear requested to flash and the symbol to be displayed at
the same time, they will be synchronised and last for the same period of time.
Fault warning light:
This warning light comes on when a fault is detected by the sequential gearbox computer.Note:
If, while the symbol is lit, the driver depresses the brake pedal, the symbol will go out and the display will return to
its previous status (the lever request is not registered).
21B -125
MR-413-X44-21B000$885.mif
V2
Vdiag No: 04SEQUENTIAL GEARBOX
Fault finding - Interpretation of commands21B
SEQUENTIAL GEARBOX FAULTS NOT IMMOBILISING
THE VEHICLE
CANNOT ACCESS AUTOMATIC MODE IF SEMI-AUTOMATIC MODE WAS
PREVIOUSLY SELECTEDALP 4
CANNOT ACCESS SEMIAUTOMATIC MODE IF AUTOMATIC MODE WAS
PREVIOUSLY SELECTEDALP 4
SWITCHING TO AUTOMATIC MODE POSSIBLE IF RESTARTING ENGINE ALP 4
NO REVERSING LIGHT ALP 5
NO CREEPING ALP 6
BRAKE LIGHTS PERMANENTLY LIT ALP 6
FORWARD OR REVERSE GEAR CAN BE SELECTED WITHOUT DEPRESSING
THE BRAKE PEDALALP 6
LOSS OF AUTOMATIC MODE ALP 7
VEHICLE DOES NOT MOVE FORWARD WITH GEAR ENGAGED AND ENGINE
RUNNINGALP 8
INADEQUATE REACTION TO FULL LOAD REQUEST ALP 9
LOSS OF DISPLAY WHEN DRIVING ALP 10
DISPLAY AND WARNING BUZZER FUNCTION ERRATICALLY ALP 11
VEHICLE JUMPS WHEN ENGINE IS STARTED ALP 12
