The gears do not engage in auto" operation

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Gear shift › The gears do not engage in auto" operation

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Fault diagnosisThe gears do not engage in auto" operation

THE GEARS DO NOT ENGAGE IN AUTO" OPERATION

1.8 T.SPARK, 2.0 JTS

The gearbox remains stuck in one gear

Whilst stationary the vehicle changes down to first gear and then no other gear can be engaged

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	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: Brake switch error Clutch sensor error Even gear engagement error Odd gear engagement error Clutch solenoid current error 1st/2nd selection solenoid valve error 5th/Reverse selection solenoid valve error Control unit earth error Load relay error Pump relay error If there is a brake switch error, the recovery considers the brake to be constantly pressed with the engine running; this means that only changes to lower gears can take place in automatic mode	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 in accordance with See Test See Test 2127I What to do for error in Selespeed control unit	Continue to Step 7	Faults detected (brake switch)	Restore/replace the component/wiring Continue to Step 7
			Faulty connections (Clutch sensor, Odd or even gear engagement, Clutch solenoid Current error, Selection solenoid valve error, Load relay error and/or Pump relay error)	Repair/replace the wiring Continue to Step 7
			The active diagnosis for the solenoid valve is not successful and no faults are detected at the wiring (Odd or even gear engagement, Clutch solenoid valve current error and/or Selection solenoid valve error)	Continue to Step 6
			Battery run down (Load relay error)	Restore the correct battery charge Op. 5530C14 Continue to Step 5
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 If this step has been reached for the active diagnosis of the selection solenoid valve, replace it Op. 2127C54 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	CHECK ON BRAKE PEDAL SWITCH	All OK	Problems met	Operation
	Check that the brake pedal switch is working properly in accordance with See Test See Test 2127F CHECK ON BRAKE PEDAL SWITCH	End of diagnosis	The brake pedal switch is not working properly	Check the switch on the brake pedal, its fastening, its positioning, the wiring and the engine management control unit. Repair/replace the part that is not working Move on to Step 10
10	AFTER THE BRAKE PEDAL SWITCH CHECK	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Continue to Step 11
11	CHECK THE CLUTCH DISC SPEED SENSOR	All OK	Problems met	Operation
	Check the clutch disc speed signal in accordance with See Test See Test 2127A HYDRAULIC TRANSMISSION EXTERNAL LINKAGE	Continue to Step 14	There are problems with the sensor signal	Continue to Step 12
12	CHECK THE STATE OF THE CONNECTIONS	All OK	Problems met	Operation
	Check the state of connections and wiring of the speed sensor. Remember that this sensor is on the gearbox bellhousing near the reversing lights sensor	Continue to Step 13	There are faults detected	Repair/replace the part that is not working Continue to Step 14
13	REPLACE THE CLUTCH DISC SPEED SENSOR	All OK	Problems met	Operation
	Replace the clutch disc speed sensor Op. 2127E52	Continue to Step 14
14	AFTER THE CHECK ON THE CLUTCH DISC SPEED SENSOR	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Contact Technical Service for further information on the problem

Sometimes, for a few seconds no gear can be engaged from the lever

Failed engagement of reverse gear and/or neutral

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	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	CHECK THAT THE LEVER AND THE CITY BUTTON ARE WORKING PROPERLY	All OK	Problems met	Operation
	Check that the lever and the City button are working properly following See Test See Test 2127H CHECK ON AUTO BUTTON AUTOMATIC OPERATION SELECTION and See Test See Test 2127L GEAR LEVER CHECK	Continue to Step 5	The lever states displayed are not correct	Check the wiring and the switches/gear lever Repair/replace the part that is not working
		Continue to Step 5	There is no change of state and/or the ''CITY'' button is not displayed	Check the switch and the wiring Repair/replace the part that is not working
5	CONTROL UNIT ERRORS CHECK	All OK	Problems met	Operation
	Check that there are no control unit errors. In particular: Lever switches error 0/1/2/3	Continue to Step 7	Presence of error indicated	Continue to Step 6
6	CHECKS ON FAULTS DETECTED	All OK	Problems met	Operation
	Check the faults in accordance with See Test See Test 2127I What to do for error in Selespeed control unit	End of diagnosis	The state displayed is not correct	Check the connections, continuity of the wiring and the gear lever 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	Contact Technical Service for further information on the problem

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