22 · Diagnostics

The gears do not engage

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

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Fault diagnosisThe gears do not engage

THE GEARS DO NOT ENGAGE

1.8 T.SPARK, 2.0 JTS

When changing from 2nd-3rd it shift to 4th and when changing from 4th-3rd it shifts to 2nd with a sensation of slowness

If no errors are detected, the problem could be due to incorrect use of the vehicle by the customer. It is advisable to carry out a road test with the customer driving

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	SLOW FINGER CHECK	All OK	Problems met	Operation
	Using the Examiner Plus or Smart in active diagnosis, launch the procedure for checking the slow finger	Continue to Step 3	The finger is slow	Replace the finger fixing bolt
3	PARAMETERS CHECK USING THE EXAMINER	All OK	Problems met	Operation
	Check that the failed engagement counters in the parameters ambient (failed engagement counters from 1st to 5th) are all at zero	Continue to Step 6	These counters are at a value different from zero	Make a note of/print out the screen showing the failed engagement counters Continue to Step 4
4	SELF CALIBRATION	All OK	Problems met	Operation
	With the Examiner Plus or Smart, in active diagnosis start end-of-line Service self-calibration	Continue to Step 5	The self-calibration is not successful	Intervene depending on the fault shown by the diagnostic equipment. After restoring the system, carry out the end of line service self-calibration procedure again.
5	ROAD TEST	All OK	Problems met	Operation
	Carry out a road test making sure to carry out as many gear changes as possible with all the available gears (under different engine rpm and load conditions). Check the failed engagement counters in the parameters environment (failed engagement counters from 1st-5th). Print out/make a note of the new counter values. Compare the new values of the parameters with those noted down previously, checking that there is not a signficant increase for one or several counters	End of diagnosis	There is a significant increase for one or more counters	Continue to Step 6
6	THE FAULT PERSISTS	All OK	Problems met	Operation
	The fault could be caused by false contacts at the gear lever or by the mechanical malfunction of the gearbox: in any case, make contact with the service department for further information about the problem	End of diagnosis

First and/or Reverse after a stop.

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 5	Level below the Max reference	Top up the oil level Continue to Step 1
		Continue to Step 5	Level above the Max reference	Reduce to the Max level Continue to Step 3
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	CHECK ON QUANTITY FOR TOPPING UP	All OK	Problems met	Operation
	Check the amount of fluid that is required for the first topping up	End of diagnosis	The quantity is less than 200 cc	Concentrating on the clutch push rod Continue to Step 1
		End of diagnosis	The quantity is more than 200 cc	Replace the hydraulic unit Op. 2727C40
3	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 5	Pressure < 40 bar	Continue to Step 4
4	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 5	Voltage below 11 V	Check the battery Continue to Step 4
		Continue to Step 5	The Pump relay output parameter state is ON, but the pump is not activated	Check the electric pump electric supply chain
5	CHECK ON BRAKE PEDAL SWITCH	All OK	Problems met	Operation
	Check the operation of the brake pedal switch as described in See Test See Test 2127F CHECK ON BRAKE PEDAL SWITCH	Continue to Step 11	The change in state does not take place	Check the brake pedal switch, its attachment, its positioning and the wiring. Repair/replace the part that is not working Continue to Step 6
6	CLUTCH PUSH ROD ADJUSTMENT CHECK	All OK	Problems met	Operation
	Carry out the clutch push rod check as described in See Test See Test 2127M CLUTCH PUSH ROD ADJUSTMENT CHECK	Continue to Step 7	The position is outside the permitted range	Restore the correct position Tighten to torque
7	CONTROL UNIT ERRORS CHECK	All OK	Problems met	Operation
	Check that there are no control unit errors. In particular: Clutch sensor error Lever switches error 0/1/2/3 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	Continue to Step 12	Presence of one or more of the errors included in the list	Continue to Step 8
8	CHECKS ON FAULTS DETECTED	All OK	Problems met	Operation
	Check the faults as described in See Test See Test 2127I What to do for error in Selespeed control unit	Continue to Step 10	Faulty connections (Clutch sensor, Odd or even gear engagement, Clutch solenoid Current error, Selection solenoid valve error, Control unit earth error and/or Load relay error)	Repair/replace the wiring Continue to Step 10
			The state displayed is not correct (lever switch error 0/1/2/3)	Check the connections, continuity of the wiring and the gear lever Continue to Step 10
			The active diagnosis has not been successful and there are no faults detected at the wiring (Odd or even gear engagement, Selection solenoid valve error and/or Clutch solenoid valve current error)	Continue to Step 9
			Battery run down (Load relay error)	Restore the correct battery charge Op. 5530C14 Continue to Step 8
9	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 selection solenoid valve, replace it Op. 2127C54 and check its operation 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 10
10	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 11
11	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 12
12	GEAR LEVER CHECK	All OK	Problems met	Operation
	Check that the gear lever is working properly following See Test See Test 2127L GEAR LEVER CHECK	Continue to Step 6	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 13
		Continue to Step 6	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 Continue to Step 13
13	AFTER THE CHECK ON THE CORRECT OPERATION OF THE GEAR LEVER	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Continue to Step 14
14	CHECK THAT THE CLUTCH IS NOT DRAGGING	All OK	Problems met	Operation
	Check that the clutch is not dragging following See Test See Test 2127K CLUTCH DRIVE CHECK	End of diagnosis	The clutch drags	Replace the clutch mechanism Op. 1810A28 Continue to Step 15
15	AFTER OPERATION ON CLUTCH KIT	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Continue to Step 16
16	SLOW FINGER CHECK	All OK	Problems met	Operation
	Using the Examiner Plus or Smart in active diagnosis, launch the procedure for checking the slow finger	Continue to Step 17	The finger is slow	Replace the finger fixing bolt
17	CHECK ON CORRECT OPERATION	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

With the engine warm.

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 in the clutch assembly	Carry out the clutch bleeding procedure using the Examiner Continue to Step 2
		Continue to Step 2	Oil leaks detected in other parts of the hydraulic unit	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 amount of oil present and continue with the topping up 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: Clutch sensor error Lever switches error 0/1/2/3 Even gear engagement error Odd gear engagement error Clutch solenoid current error 1st/2nd selection solenoid valve 5th/Reverse selection solenoid valve Control unit earth error Load relay error	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 according to See Test See Test 2127I What to do for error in Selespeed control unit	Continue to Step 7	Faulty connections (Clutch sensor, Odd or even gear engagement, Clutch solenoid Current error, Selection solenoid valve error, Control unit earth error and/or Load relay error)	Repair/replace the wiring Continue to Step 7
			The state displayed is not correct (lever switch error 0/1/2/3)	Check the connections, continuity of the wiring and the gear lever Continue to Step 7
			The active diagnosis has not been successful and there are no faults detected at the wiring (Odd or even gear engagement, Selection solenoid valve error and/or Clutch solenoid valve current 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 diganosis 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 selection solenoid valve, replace it Op. 2127C54 and check its operation 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	CLUTCH PUSH ROD ADJUSTMENT CHECK	All OK	Problems met	Operation
	Carry out the clutch push rod check as described in See Test See Test 2127M CLUTCH PUSH ROD ADJUSTMENT CHECK	Continue to Step 10	The position is outside the permitted range	Restore the correct position Tighten to torque
10	CHECK THAT THE CLUTCH IS NOT DRAGGING	All OK	Problems met	Operation
	Check that the clutch is not dragging following See Test See Test 2127K CLUTCH DRIVE CHECK	Continue to Step 11	The clutch drags	Replace the clutch mechanism Op. 1810A28
11	GEAR LEVER CHECK	All OK	Problems met	Operation
	Check that the gear lever is working properly following See Test See Test 2127L GEAR LEVER CHECK	Continue to Step 12	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 12	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
12	CHECK ON BRAKE PEDAL SWITCH	All OK	Problems met	Operation
	Check that the brake pedal switch is working properly following 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 13
13	AFTER THE CHECK ON THE BRAKE PEDAL SWITCH	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists	Continue to Step 14
14	SLOW FINGER CHECK	All OK	Problems met	Operation
	Using the Examiner Plus or Smart in active diagnosis, launch the procedure for checking the slow finger	Continue to Step 15	The finger is slow	Replace the finger fixing bolt
15	Continue as instructed by the tester	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

Reverse gear cannot be engaged sometimes

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 in the clutch assembly	Carry out the clutch bleeding procedure in active diagnosis using the Examiner Continue to Step 2
		Continue to Step 2	Oil leaks detected in other parts of the hydraulic unit	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 amount of oil present and continue with the topping up 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	GEAR LEVER CHECK	All OK	Problems met	Operation
	Check that the gear lever is working properly following 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: Clutch sensor error Lever switches error 0/1/2/3 Even gear engagement error Odd gear engagement error Clutch solenoid current error 5th/Reverse selection solenoid valve error Control unit earth error Load relay error	Continue to Step 10	Presence of one or more of the errors included in the list	Continue to Step 6
6	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	Continue to Step 8	Faulty connections (Clutch sensor, Odd or even gear engagement, Clutch solenoid Current error, Selection solenoid valve error, Control unit earth error and/or Load relay error)	Repair/replace the wiring Continue to Step 8
			The state displayed is not correct (lever switch error 0/1/2/3)	Check the connections, continuity of the wiring and the gear lever Continue to Step 8
			The active diagnosis has not been successful and there are no faults detected at the wiring (Odd or even gear engagement, Selection solenoid valve error and/or Clutch solenoid valve current error)	Continue to Step 7
			Battery run down (Load relay error)	Restore the correct battery charge Op. 5530C14 Continue to Step 6
7	AFTER THE SOLENOID VALVE ACTIVE DIAGNOSIS	All OK	Problems met	Operation
	If this step has been reached for the active diganosis 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 selection solenoid valve, replace it Op. 2127C54 and check its operation 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 8
8	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 9
9	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 10
10	CHECK THAT THE CLUTCH IS NOT DRAGGING	All OK	Problems met	Operation
	Check that the clutch is not dragging following See Test See Test 2127K CLUTCH DRIVE CHECK	End of diagnosis	The clutch drags	Replace the clutch mechanism Op. 1810A28 Continue to Step 11
11	AFTER OPERATION ON CLUTCH KIT	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

Whilst driving, nothing above second is engaged irrespective of the mode (manual/automatic).

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	CONTROL UNIT ERRORS CHECK	All OK	Problems met	Operation
	Check that there are no control unit errors. In particular: Engagement sensor error Selection sensor error Engine speed error Clutch disc speed error Vehicle speed error Starting enablement relay error (CAN) message reception error CAN message transmission error No accelerator pedal information error Control unit broken error Brake switch error Microprocessor 2 error	Continue to Step 6	Presence of one or more of the errors included in the list	Continue to Step 3
3	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 4	Faulty connections (Engagement sensor, Selection sensor, Clutch disc speed, CAN errors, No acelerator pedal information)	Repair/replace the wiring Continue to Step 4
			Faulty connection (Engine speed)	Repair/replace the part concerned Continue to Step 4
			Errors in ABS control unit	Continue according to the instructions for the diagnostic equipment
			Errors in engine management control unit	Continue according to the instructions for the diagnostic equipment
			CAN communication problems	Restore correct communication, if necessary replacing faulty components Continue to Step 4
			The change of state does not take place (starting enablement relay error)	Check the brake pedal switch, its attachment and the state of the wiring connections. Restore/replace the component/wiring Continue to Step 4
			One of the control units does not dialogue (Errors on CAN network)	Repair/replace the control unit concerned Continue to Step 4
			Having replaced the Robotized Gearbox control unit (Control unit broken error and/or microprocessor 2 error)	Continue to Step 4
			Faults detected (brake switch)	Restore/replace the component/wiring Continue to Step 4
4	SENSOR REPLACEMENT	All OK	Problems met	Operation
	If there is a gear engagement sensor error and no faults are detected at the connections/wiring, replace it Op. 2127E42 and check that the position reading is correct by carrying out a series of C.M. In some cases, when the sensor is dismantled, there may be iron filings deposited on the sensor head It is advisable to fit tool n° 1870753001 before removing the potentiometer from the hydraulic unit If there is a gear selector sensor error and no faults are detected at the connections/wiring, replace it Op. 2127E40 and check that the position reading is correct by carrying out a series of C.M. If there is a clutch disc speed error and no faults are detected at the connections/wiring, replace it Op. 2127E52 and check that the position reading is correct by carrying out a series of C.M. The sensor is located on the gearbox casing to the right of the reversing lights sensor	Continue to Step 5
5	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 6
6	CLUTCH DISC SPEED SENSOR CHECK	All OK	Problems met	Operation
	Check the clutch disc speed signal according to the See Test See Test 2127A HYDRAULIC TRANSMISSION EXTERNAL LINKAGE	Continue to Step 9	There are problems with the sensor signal	Continue to Step 7
7	CHECK THE STATE OF THE CONNECTIONS	All OK	Problems met	Operation
	Check the state of connections and wiring of the speed sensor. In some cases, when the sensor is dismantled, there may be iron filings deposited on the sensor head	Continue to Step 8	There are faults detected	Repair/replace the part that is not working Continue to Step 9
8	REPLACE THE CLUTCH DISC SPEED SENSOR	All OK	Problems met	Operation
	Replace the clutch disc speed sensor Op. 2127E52	Continue to Step 9
9	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

It skips a gear/the requested gear is not engaged.

If no errors are detected, the problem could be due to incorrect use of the vehicle by the customer.

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
	Check that there are no control unit errors. In particular: Engagement sensor error Selection sensor error	Continue to Step 4	Presence of one or more of the errors included in the list	Continue to Step 1
	Check the faults according to the See Test See Test 2127I What to do for error in Selespeed control unit	Continue to Step 2	Faulty connections	Repair/replace the wiring Continue to Step 2
2	SENSOR REPLACEMENT	All OK	Problems met	Operation
	If there is a gear engagement sensor error and no faults are detected at the connections/wiring, replace it Op. 2127E42 and check that the position reading is correct by carrying out a series of C.M. It is advisable to fit tool n° 1870753001 before removing the potentiometer from the hydraulic unit If there is a gear selector sensor error and no faults are detected at the connections/wiring, replace it Op. 2127E40 and check that the position reading is correct by carrying out a series of C.M.	Continue to Step 3
3	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 4
4	PARAMETERS CHECK USING THE EXAMINER	All OK	Problems met	Operation
	Check that the failed engagements counters in the parameters environment (failed engagement counters for: neutral, 1st-5th and reverse) are all at zero.	Continue to Step 7	These counters are at a value different from zero	Make a note of/print out the screen showing the failed engagement counters. Continue to Step 5
5	SELF CALIBRATION	All OK	Problems met	Operation
	With the Examiner Plus or Smart, in active diagnosis start end-of-line/Service self-calibration	Continue to Step 6	The self-calibration is not successful	Continue according to the instructions for the diagnostic equipment
6	ROAD TEST	All OK	Problems met	Operation
	Carry out a road test, making sure to make as many gear changes as possible with all the available gears (under different engine speed and load conditions). Check the failed engagement counters in the parameters environment (failed engagement counters in: neutral, 1st-5th and Reverse). Print out/make a note of the new counter values. Compare the new values of the parameters with those noted down previously, checking that there is not a signficant increase for one or several counters	End of diagnosis	There is a significant increase for one or more counters	Continue to Step 7
7	SLOW FINGER CHECK	All OK	Problems met	Operation
	Using the Examiner Plus or Smart in active diagnosis, launch the procedure for checking the slow finger	Continue to Step 8	The finger is slow	Replace the finger fixing bolt Continue to Step 8
8	THE FAULT PERSISTS	All OK	Problems met	Operation
	The fault may be caused by false contacts on the gear lever: check the state of the connections and wiring for the lever. In any event, contact Technical Service for further information on the problem.	End of diagnosis

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Parts & tools for this job For 2003 Alfa Romeo GT

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