P1780
Symptom: The "CHECK ACS" warning lamp is alight. System functions are disabled and the clutch cannot be operated. The car is undrivable.
Clutch casing, hydraulic fault
Fault symptom
The "CHECK ACS" warning lamp is alight. System functions are disabled and the clutch cannot be operated. The car is undrivable.
Condition
The clutch actuator unit's electric motor is overloaded.
Diagnostic procedure
1 Check the clutch actuator unit's electrical connections
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Turn the ignition switch to the ON position.
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Take voltage readings with a multimeter on the female connector contacts. Nominal voltages are as follows:
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Battery positive across B+ and pin 4
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battery positive across pins 5 and 4
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1.0 V across pins 2 and 4
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3.5 V across pins 3 and 4
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Battery positive across B+ and pin 6
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5.0 V across pins 7 and 4
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10.0 V across pins 8 and 4, if "ON" is selected for the "CLUTCH ACTUATOR" command in the "ACTIVATE" menu.
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All readings OK?
Continue with point 2.
Repair or replace the lead in question and proceed to point 3.
2 Check the hydraulic system
Check the functionality of the hydraulic system, see
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Is functionality OK?
Try changing the clutch actuator unit and continue with point 3.
Rectify the fault and continue with point 3.
3 Final check
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Clear the diagnostic trouble code.
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Perform a drive cycle by driving the car at varying engine rpm and loads for 5 minutes.
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Check whether the diagnostic trouble code has recurred.
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Has the diagnostic trouble code recurred?
Continue as described in the section "Before replacing a control module", see
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The steps taken to rectify the fault were correct.
