22 · Diagnostics

The car goes into neutral by itself

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Gear shift › The car goes into neutral by itself

‹ Prev The gearbox is'' noisy Next › The engine revs increase whilst changing gear

Fault diagnosisThe car goes into neutral by itself

THE CAR GOES INTO NEUTRAL BY ITSELF

1.8 T.SPARK, 2.0 JTS

Whilst stopping

When travelling at speeds below 40 km/h

When stationary with a gear engaged (1st, 2nd or R)

It should be remembered that the operating strategies that involve positioning the gearbox in neutral either with the vehicle stationary, the engine running, a gear engaged and the brake pressed do not act on the controls for 10 minutes

0	OIL LEVEL CHECK	All OK	Problems met	Operation
		Results of the tests
	Check the oil level as described in See Test See Test 2127B OIL LEVEL CHECK	Continue to Step 2	Level below the Max reference	Top up the oil level Continue to Step 1
		Continue to Step 2	Level above the Max reference	Reduce to the Max level Continue to Step 2
1	CHECK FOR OIL LEAKS	All OK	Problems met	Operation
	Check that there are no oil leaks as described in See Test See Test 2127C HYDRAULIC GEAR SELECTION SYSTEM	Continue to Step 2	Oil leaks detected	Replace/repair the parts concerned, and top up the oil level Continue to Step 1
2	OIL PRESSURE CHECK	All OK	Problems met	Operation
	Check the oil pressure as described in See Test See Test 2127D OIL PRESSURE CHECK Neutral for low pressure only exists if the vehicle is stationary or moving at low speed (about 10 km/h)	Continue to Step 4	Pressure < 40 bar	Continue to Step 3
3	ELECTRIC PUMP OPERATION CHECK	All OK	Problems met	Operation
	Check the correct operation of the pump as described in See Test See Test 2127E ELECTRIC SPEED SELECTION SYSTEM	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 4
4	CONTROL UNIT ERRORS CHECK	All OK	Problems met	Operation
	Check that there are no control unit errors. In particular: Clutch solenoid current Clutch sensor Odd gear engagement (short circuit to Vbatt) Even gear engagement (short circuit to Vbatt)	Continue to Step 9	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 described in Test 2127I	Continue to Step 7	Faulty connections	Repair/replace the wiring Continue to Step 7
	Check the faults described in Test 2127I	Continue to Step 7	The active diagnosis of the solenoid valve is not successful and no faults are detected at the wiring (Clutch solenoid valve current and/or Even or odd gear engagement)	Continue to Step 6
6	AFTER THE SOLENOID VALVE ACTIVE DIAGNOSIS	All OK	Problems met	Operation
	If this step has been reached for the active diagnosis of the clutch solenoid valve, replace it Op. 2127C56 and check its operation by carrying out a C.M. If this step has been reached for the active diagnosis of the engagement solenoid valve, replace it Op. 2127C52 and check its operation	Continue to Step 7
7	POTENTIOMETER REPLACEMENT	All OK	Problems met	Operation
	If there is a clutch sensor error and no faults are detected at the connections/wiring, replace the clutch potentiometer Op. 2127E44 and check that the position reading is correct by carrying out a series of C.M.	Continue to Step 8
8	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 9
9	DOOR SWITCH CHECK	All OK	Problems met	Operation
	Check the state of the driver''s door switch (it should be remembered that the system recognizes the opening of the door if the accelerator pedal is released for 2 seconds, the brake not pressed and the speed is below 4.5 km/h)	Continue to Step 10	The door switch is not working properly	Check the state of the connections, the wiring and the switch. Repair/replace the part that is not working
10	CHECK THE CORRECT OPERATION OF THE LEVER	All OK	Problems met	Operation
	Check the operation of the lever (remembering that neutral can be engaged with the vehicle moving at speeds below 40 km/h)	End of diagnosis	The lever is not working properly	Check the state of the connections and the wiring. Repair/replace the part that is not working

When changing gear with the vehicle moving

0	OIL LEVEL CHECK	All OK	Problems met	Operation
		Results of the tests
	Check the oil level as described in See Test See Test 2127B OIL LEVEL CHECK	Continue to Step 2	Level below the Max reference	Top up the oil level Continue to Step 1
		Continue to Step 2	Level above the Max reference	Reduce to the Max level Continue to Step 2
1	CHECK FOR OIL LEAKS	All OK	Problems met	Operation
	Check that there are no oil leaks as described in See Test See Test 2127C HYDRAULIC GEAR SELECTION SYSTEM	Continue to Step 2	OIl leaks detected	Replace/repair the parts concerned, and top up the oil level Continue to Step 1
2	OIL PRESSURE CHECK	All OK	Problems met	Operation
	Check the oil pressure as described in See Test See Test 2127D OIL PRESSURE CHECK Neutral for low pressure only exists if the vehicle is stationary or moving at low speed (about 10 km/h) In these conditions, the words Selespeed Gearbox Failure disappear without any error being memorized in the control unit	Continue to Step 4	Pressure < 40 bar	Continue to Step 3
3	ELECTRIC PUMP OPERATION CHECK	All OK	Problems met	Operation
	Check the correct operation of the pump as described in See Test See Test 2127E ELECTRIC SPEED SELECTION SYSTEM	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 4
4	CONTROL UNIT ERRORS CHECK	All OK	Problems met	Operation
	Check that there are no control unit errors. In particular: Clutch solenoid current Odd gear engagement (short circuit to Vbatt) Even gear engagement (short circuit to Vbatt)	Continue to Step 8	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 according to See Test See Test 2127I What to do for error in Selespeed control unit	End of diagnosis	Faulty connections	Repair/replace the wiring Continue to Step 7
		End of diagnosis	The active diganosis is not successful and there are no faults detected at the wiring	Continue to Step 6
6	AFTER THE SOLENOID VALVE ACTIVE DIAGNOSIS	All OK	Problems met	Operation
	If this step has been reached for the active diagnosis of the clutch solenoid valve, replace it Op. 2127C56 and check its operation by carrying out a C.M. If this step has been reached for the active diagnosis of the engagement solenoid valve, replace it Op. 2127C52 and check its operation	Continue to Step 7
7	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 8
8	CHECK ENGAGEMENT OF ALL GEARS	All OK	Problems met	Operation
	Check that all the gears engage correctly in accordance with See Test See Test 2127N CHECK ON CORRECT ENGAGEMENT OF ALL GEARS USING THE GEAR LEVER WITH THE ENGINE NOT RUNNING	End of diagnosis	The test is not successful	Contact Technical Service for further information on the problem

‹ Prev The gearbox is'' noisy Next › The engine revs increase whilst changing gear

Parts & tools for this job For 2003 Alfa Romeo GT

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