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CAN network error:
• Check:
• the network sees all the control units (n.b.: pay attention
because any control unit connected to the CAN network could cause
faults in network operation). If one of the control units does not
dialogue, recover/replace that control unit.
• condition of the connections and continuity of the wiring
regarding the CAN line. It is better not to just make a visual
analysis of the connection, but to test putting it under mechanical
stress (pull the wires, twist them, check that the pins are firm……..);
if a fault is found, restore/replace the wiring.
Engine speed (from wire):
• check the correct connection between engine control unit and
Selespeed control unit , since this signal is sent by the engine
control unit through a special wire. If a fault is found restore/replace
the part involved.
1st/2nd gear range selection solenoid valve:
• Run the solenoid valve active diagnostics. If the test does not
give satisfactory results, pass to the next step
• Check the condition of the connections and continuity of the
wiring. If a fault is found, restore/replace the wiring.
• Run the solenoid valve active diagnostics again. If the test does
not give satisfactory results replace the solenoid valve and check
the functioning.
5th/R gear range selection solenoid valve
• Run the solenoid valve active diagnostics. If the test does not
give satisfactory results, pass to the next step
• Check the condition of the connections and continuity of the
wiring. If a fault is found, restore/replace the wiring.
• Run the solenoid valve active diagnostics again. If the test does
not give satisfactory results replace the solenoid valve and check
the functioning.
Clutch solenoid valve current error:
• Check the condition of the connections and continuity of the
wiring. If a fault is found, restore/replace the wiring.
• Replace the solenoid valve and check the functioning by making a
gear shift.
Clutch sensor:
• Check the condition of the connections and continuity of the
wiring. If a fault is found, restore/replace the wiring.
• Replace the clutch potentiometer and check the functioning by
making a gear shift.
Odd or even gears engagement (engagement solenoid valves)
• Run the solenoid valve active diagnostics. If the test does not
give satisfactory results, pass to the next step
• Check the condition of the connections and continuity of the
wiring. If a fault is found, restore/replace the wiring.
• Run the solenoid valve active again. If the test does not give
satisfactory results replace the solenoid valve and check the
functioning.
Control unit earth error
• Check the tightness of the earth connections on the body and on
the engine.
• Check the condition of the connections and continuity of the
wiring. If a fault is found, restore/replace the wiring.
Charging relay error*
• Check the condition of the battery
• Check the condition of the connections and continuity of the
wiring. Make a careful check on the items that supply the power to
the control unit (wiring, fuses, relay etc.). If a fault is found,
restore/replace the wiring.
Lever switches 0/1/2/3 error
• Connect the Examiner diagnostics tool and select "LEVER STATUS" in
parameters environment.
• Make all the selections possible with the buttons on the steering
wheel and the gear lever (one at a time) checking the correct status
change on Examiner; the list of the selections to be made is the
following:
• Lever Up (+) (forward)
• Lever Down (-) (backward)
• Lever on idle (N)
• Lever on Reverse (R)
• Lever released
• If the status displayed is not correct, check the connections, the
wiring continuity and the gear shift lever.
• Lever switch error (any of the four, or auto button)
Lever check
• Connect the Examiner diagnostics tool and select the "LEVERS
STATUS" display in parameters environment.
• Make all the selections possible with the buttons on the steering
wheel and the gear lever (one at a time) checking the correct status
change on Examiner; the list of the selections to be made is the
following:
• Lever Up (+) (forward)
• Lever Down (-) (backward)
• Lever on idle (N)
• Lever on Reverse (R)
• Lever released
• If the status displayed is not correct, check the connections, the
wiring continuity and the gear shift lever.
Auto button check
• Select the state of inputs display (ON/OFF) relating to the auto
button.
• Press and release the automatic operation selection button at the
base of the gear shift lever.
• Check on Examiner that the change of status has taken place.
• Start the engine and check that when the button is pressed, "AUTO"
is shown on the display .
• If the change of status does not take place (step 4) and/or "AUTO"
is not displayed( step 5.), check the button and the wiring
N.B. there have been cases where the auto button remains stuck: this
can cause malfunctioning of the lever.
Engagement sensor.
When this error is present, the gear change is slower than usual due
to the system operating in recovery.
• Check the condition of the connections and continuity of the
wiring. If a fault is found, restore/replace the wiring.
• Replace the engagement potentiometer ** and check the correct
reading of the position, making a series of gear changes
Selection sensor.
When this error is present, the gear change is slower than usual due
to the system operating in recovery.
• Check the condition of the connections and continuity of the
wiring. If a fault is found, restore/replace the wiring.
• Replace the selection potentiometer and check the correct reading
of the position, making a series of gear changes.
Clutch disk speed (this signal is read by the sensor that reads
the speed of the primary shaft***)
• Check the condition of the connections and continuity of the
wiring. If a fault is found, restore/replace the wiring.
• Replace the clutch disk speed sensor (see components r/r general
procedure) and check the correct reading of the position, making a
series of gear changes.
Car speed.
Only for
Alfa 156 Selespeed:
N.B.
The car speed signal is supplied by the Instrument Panel on
board to the Selespeed control unit, therefore any signal omission/fault
on the panel will also result on the Selespeed System.
Proceed
as follows:
• Check that the car speed signal arrives continually to the Panel on board.
• If the signal does not arrive continuously:
• Proceed following the instructions in the Service Handbook
• If the signal arrives continuously:
• Check the condition of the connections and continuity of the line
wiring, especially between the control units signalled with an error.
If a fault is found, restore/replace the wiring
Only for
Alfa 147 Selespeed:
N.B.
IThe car speed signal reaches the Selespeed control unit through
the CAN line from the ABS control unit, therefore any signal
omission/fault on the ABS control unit will also result on the
Selespeed System. Proceed as follows:
• Check whether there are any faults in the ABS control unit and/or
the engine control unit that justify the omission of the car speed
signal.
• If no faults are found:
• Use the EXAMINER diagnostics tool to check for dialogue problems
on the CAN line
No accelerator pedal information.
The signal is received by the Selespeed control unit through the CAN
line:
• On Examiner select CAN network information and check if there is
the presence of control unit error
• Check the condition of the connections and continuity of the line
wiring, especially between the control units signalled with an error.
If a fault is found, restore/replace the wiring .
Brake switch.
The signal is received by the Selespeed control unit through the CAN
line and through a wire:
• Check the condition of the brake switch.
1. Bring the ignition key to MAR.
2. Connect the Examiner diagnostics tool and select the inputs
status display (ON/OFF) for the switch on the brake pedal.
3. Press the brake pedal and check that the displayed value changes
(from released to pressed and vice-versa).
4. If there is no status change check the switch on the brake pedal,
its fastening, its position, the condition of the connections and
the wiring.
• If a fault is found, restore/replace the components/wiring
Pump relay error
• check the condition of the connections and continuity of the
wiring. Make a careful check on the items that supply power to the
electric pump (fuses, relay etc.). If a fault is found, restore/replace
the wiring.
There have been cases where the "fastom" housed in the relay
holder socket have pulled out.
Accumulator oil discharge error:
• replace the accumulator
Start enable relay error
• The Selespeed control unit supplies the earth for the start relay
block; if a short circuit to the battery or an open circuit is
diagnosed, the engine cannot start; if instead a short circuit to
earth is found the engine can be started without the enable from the
Selespeed control unit. In any case the problem arises from the
wiring or from systems that enable the start downstream of the
Selespeed control unit. Check the condition of the connections and
the continuity of the wiring downstream of the Selespeed control
unit.
Check the condition of the brake switch.
1. Bring the ignition key to MAR.
2. Connect the Examiner diagnostics tool and select the inputs
status display (ON/OFF) for the switch on the brake pedal.
3. Press the brake pedal and check that the displayed value changes.
4. If there is no status change check the switch on the brake pedal,
its fastening, its position, the condition of the connections and
the wiring.
• If a fault is found, restore/replace the components/wiring.
* This error is connected to a control unit power supply problem and
not to the control unit itself
** It is a good practice to insert
tool n°1870753001 before removing the hydraulic unit
potentiometer
*** This sensor is positioned on the gearbox to the
right of the reverse lights sensor |
