22 · Diagnostics

The vehicle jerks

Make: Fiat
Model: Stilo Factory Service Manual
Year: 2001–2007
Section: Gear shift › The vehicle jerks

‹ Prev The gears do not engage in "auto" operation Next › The revs increase as the vehicle sets off

Fault diagnosisThe vehicle jerks

THE VEHICLE JERKS

2.4 20v

It shudders when setting off from a standstill

It shudders during a gear change

Preliminary check: If the vehicle has faults in other systems (warning lights in instrument panel relating to: engine management, ABS, ESP, etc.) check the causes of these problems. If this is not the case, proceed with the following chart

0	OIL LEVEL CHECK	All OK	Problems met	Operation
		Results of the tests
	Check the oil level See Test 2127B OIL LEVEL CHECK	Continue to Step 2	Level below Max reference	Top up the level Continue to Step 1
	Check the oil level See Test 2127B OIL LEVEL CHECK	Continue to Step 2	Level above Max reference	Reduce to Max level Continue to Step 2
1	CHECK FOR OIL LEAKS	All OK	Problems met	Operation
	Check that there are no oil leaks See Test 2127C CHECK FOR FLUID LEAKS	Continue to Step 2	Oil leaks detected	Replace/repair the relevant parts, top up the oil level Continue to Step 1
2	OIL PRESSURE CHECK	All OK	Problems met	Operation
	Check the oil pressure See Test 2127D OIL PRESSURE CHECK	Continue to Step 4	Pressure < 40 bar	Continue to Step 3
3	CHECK THE OPERATION OF THE PUMP	All OK	Problems met	Operation
	Check that the pump is working properly See Test 2127E ELECTRIC PUMP OPERATION CHECK	Continue to Step 4	Voltage below 11 V	Check the battery Continue to Step 3
		Continue to Step 4	It is not possible to make gear changes from the lever	Activate the 'clutch bleed' service from the Examiner Plus or Smart to activate the pump Continue to Step 3
4	CONTROL UNIT ERRORS CHECK	All OK	Problems met	Operation
	Check that there are no control unit errors. In particular: Clutch position sensor CAN network errors	Continue to Step 7	Presence of one or more of the errors included in the list	Continue to Step 5
5	CHECKS ON FAULTS DETECTED	All OK	Problems met	Operation
	Check the faults See Test 2127I What to do depending on the error' present in the Selespeed control unit No accelerator pedal information.	End of diagnosis	Faulty connections (Clutch sensor)	Repair/replace the wiring Continue to Step 6
			There are no faulty connections (Clutch sensor)	Replace the clutch actuator (CSC) and check its operation by carrying out a gear change Continue to Step 6
			One of the control units does not dialogue (CAN network errors)	Repair/replace the control unit concerned Continue to Step 6
6	AFTER THE CHECKS ON THE FAULTS DETECTED	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Continue to Step 7
7	BLEED THE SYSTEM USING THE EXAMINER	All OK	Problems met	Operation
	In active diagnosis carry out two system bleeding cycles using the 'clutch bleed' command	Continue to Step 8
8	CARRY OUT CLUTCH PARAMETER CALIBRATION USING THE EXAMINER	All OK	Problems met	Operation
	In active diagnosis carry out the calibration of the clutch parameters through the 'clutch self-calibration enablement'	Continue to Step 9
9	ROAD TEST	All OK	Problems met	Operation
	Carry out a road test to check that the fault is no longer present	End of diagnosis	The fault persists	Continue to Step 10
10	CHECK CLUTCH SENSOR WIRING LAYOUT	All OK	Problems met	Operation
	Check the state of the connections, continuity of the wiring (it is important to pay particular attention to the layout of the clutch position sensor wiring in the engine compartment: the wire must not be too taut, and must have sufficient slack)	Continue to Step 12	A fault is detected	Repair/replace the part that is not working Continue to Step 11
11	CHECK THAT THE FAULT IS NO LONGER PRESENT	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Continue to Step 12
12	FURTHER CHECKS ON OTHER SYSTEMS	All OK	Problems met	Operation
	Check that the problem has not been caused by other systems such as the engine, fuel system, etc.	Continue to Step 13	There are faults on other vehicle systems	Continue in accordance with the appropriate diagnostic table
13	THE FAULT PERSISTS	All OK	Problems met	Operation
	Contact Technical Service for further information on the problem	End of diagnosis	Fault persists	Search for the fault starting from another symptom'

‹ Prev The gears do not engage in "auto" operation Next › The revs increase as the vehicle sets off

Parts & tools for this job For 2001 Fiat Stilo

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