System self-diagnosis
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.