Feb 102015

The gearbox check control unit diagnosis, after ascertaining a fault takes action regarding the down-grade functioning. This data is indicated referring to the faulty component, in the table below:

Gear engagement solenoid valves (proportional) On Gear shift acceptance locked, gear engagement excluding idle (N) (vehicle stationary)
Gear selection solenoid valve (ON/OFF) On Gear shift acceptance locked, gear engagement excluding idle (vehicle stationary)
Engagement and selection position sensors On Long time for gear shift.
Rev sensors: engine, gear input and gear output (car speed) On Gear shift acceptance limited to 1, 2, R, N
Oil pressure sensor On Electric pump control in open-loop
Gear request lever switches On Switching in automatic mode “CITY”, cannot engage R
Buttons on steering wheel switches On Does not accept commands from steering wheel
Clutch solenoid valve (proportional) On Clutch control lock, automatic shift to idle (N) (vehicle stationary)
Clutch position sensor On Clutch control lock, automatic shift to idle (N) (vehicle stationary)
Pump relay control On Vehicle stationary
Buzzer control On Continual functioning
Start enable relay control On Gear shift acceptance limitation for 1, 2, R, N
Brake status switch On With engine off does not accept gear change, engine only starts with gear in idle (N)
Message transmission CAN line On C.C.M. does not check torque with city disabled
Message receiving CAN line On Gear shift acceptance limitation for 1, 2, R, N C.C.M. does not check torque
CFC 208F microprocessor On Gear shift acceptance limitation for 1, 2, R, N
Control unit CFC 208F earth On Total system lock
CFC 208F memory On Gear shift acceptance limitation for 1, 2, R, N
Display serial line control On Gear engaged not displayed
Accumulator discharged On No recovery
Pump relay glued On No recovery
Accelerator pedal On 1, 2, R, N engagement indication not valid and limitation of engine revs.
 Posted by at 8:57 pm
Feb 102015

The diagnostics implemented in the control unit CFC 208F allow the testing of the inputs:

  • rev sensor from rev counter module
  • clutch disk speed sensor (gearbox primary)
  • car speed from CAN line (through A.B.S.)

This consists in checking whether or not there is the signal.
The diagnostics on the analog input signals is made checking these type of failures:

  • signal out of electrical range
  • signal out of dynamic range

The diagnostics implemented on the output controls of the control unit CFC 208F concern:

  • the three proportional solenoid valves
  • the two on-off solenoid valves
  • the two relays (hydraulic pump and engine start enable)

The types of failures checked are:

For proportional solenoid valves:

  • short circuit to earth
  • short circuit to +Vbatt
  • circuit open

For ON/OFF solenoid valves:

  • short circuit to earth

Electric pump relay:

  • circuit open
  • short circuit to +Vbatt
  • Start-up enable relay
  • short circuit to earth
  • circuit open

These input signals and output commands are excluded from the diagnosis:

  • brake pedal (except permanent closed circuit for a certain time with car moving)
  • automatic mode (CITY) and door open switches
  • the signals supplied by C.C.M. on CAN network
  • diagnostics serial line (K)
  • signals :key (+15/54) power supply (+30) direct from battery.
 Posted by at 8:45 pm
Nov 212013

To stop the car just release the accelerator pedal and if necessary act on the brake pedal. Regardless of the gear engaged and the operating mode activated (Manual or “City”) the system automatically deactivates the clutch and lowers the gears in the gearbox. If it is intended to start off again without having completely stopped the car, the most suitable gear ratio will be available to accelerate again.
When the vehicle is stopped the system automatically engages the first gear.

 Posted by at 8:20 pm
Nov 212013

With the engine on and the vehicle stationary the gears that can be engaged to start are only the first (1), the second (2), and/or reverse (R). To engage the gear, just use the control lever on the tunnel keeping the brake pedal pressed (the buttons on the steering wheel only allow gear engagement at speeds over 10 Km/h.

  • With the vehicle stationary and gear engaged still keep the brake pedal pressed until you actually move off.
  • In long halts with the engine running it is advised to remain idling.
  • If the car has to be parked uphill, do not use the take off manoeuvre to keep the vehicle still, use the brake pedal and only use the accelerator pedal when you decide to move off.
  • Only use the second gear when it is necessary to have better control of the take-off in manoeuvres with poor grip.
  • If , with reverse gear engaged, the first gear is to be inserted, or vice-versa, wait until the vehicle is completely still before operating, and keep the brake pedal pressed.

Although it is most definitely advised against doing so, if when going downhill the vehicle is allowed to proceed in idle gear, when the engagement of a gear is requested the system will automatically engage, according to the speed of the car, the best gear to have the correct transmission of the driving torque to the wheels . If instead, the vehicle proceeds downhill with the gear engaged and the accelerator released, when a set speed value is passed, the system will engage the clutch automatically to give adequate engine braking to the car.

For safety reasons the system activates the warning buzzer when:

  • If during the vehicle start-up manoeuvres the clutch overheats, in this case it is necessary to “force” the starting without hesitating, or otherwise release the accelerator and use the brake pedal to park the car on the slope.
  • If the car goes forward in the opposite direction to the gear engaged (e.g. the vehicle goes forward with the reverse gear engaged). In this case stop the vehicle keeping the brake pedal pressed and engage the correct gear.

Still for safety reasons, with the car stationary, engine running and gear (1)-(2) or (R) engaged, the system activates the buzzer and automatically puts the gear to idling when:

  • no operation is made on the accelerator pedal or the brake pedal for at least 60 s.
  • the brake pedal is kept pressed for more than 3 min .
  • the door on the driver’s side is opened, after 2 seconds the car goes automatically into idling condition.

NOTE: The reverse gear (R) can be engaged from each of these ratios:

  • Idle (N)
  • First (1)
  • Second (2).

If the vehicle is moving, the request is not accepted, you must wait until the car is completely still then request the reverse gear (R) engagement again. The reverse gear engaged condition is indicated to the driver on the display and also by the buzzer. In the same way, in the case of crawling on the reverse gear, the system partially closes the clutch to favour the gear engagement. In this case the engagement of the reverse gear will be less smooth.

 Posted by at 8:02 pm
Nov 212013

The engine start-up can take place with the brake pedal pressed, either with the gear engaged or with the gearbox already in idle (N). With the engine running, the gearbox shows the letter (N) and the system sets the semi-automatic operation (manual).

 Posted by at 7:59 pm