22 · Diagnostics

Ignition key cannot be acknowledged

Make: Fiat
Model: Croma Factory Service Manual
Year: 2005–2010
Section: Starting › Ignition key cannot be acknowledged

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Fault diagnosisIgnition key cannot be acknowledged

IGNITION KEY CANNOT BE ACKNOWLEDGED

When the TEG is inserted in the TEG-READER the steering is not unlocked and the TEG-READER locking/unlocking motor does not allow the TEG to turn.

If the introduction of the TEG is not recognized, the user must use the recovery insert to mechanically enable the rotation

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Results of the tests
	Check that the battery voltage is not below 8.5 Volt. Check that when the key is inserted in the ignition its presence is not recognized by activating the OFF position switch. Check whether the system works properly when another key is used. Check that the ignition locking/unlocking motor enables the rotation of the key. Check that the LEDs lighting up the writing on the TEG-Reader are on and the CAN is woken up	End of diagnosis	Battery run down	Recharge the battery
			Key not recognized	Move on to Step 1
			Everything works properly using a second key	Replace the key and programme it (see operation 0520G85 - SYSTEM CODE - Check using the EXAMINER)
			Ignition locking/unlocking motor not working	Move on to Step 2
			The LEDs for the TEG-Reader ring nut do not come on.	Move on to Step 2
1	CHECK WITH EMERGENCY INSERT	All OK	Problems encountered	Operation
	Use the emergency insert to stop the restriction for turning the key. Turn the key to the ON position and check whether the ignition is still not working.	Move on to Step 4	The ignition is working	Replace the ignition Op. 5520A10 IGNITION SWITCH ASSEMBLY - R+R
2	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment and check in active diagnosis in the TEG READER node that the ignition locking/unlocking motor is correctly activated	Move on to Step 3	Ignition locking/unlocking motor defective	Replace the ignition Op. 5520A10 IGNITION SWITCH ASSEMBLY - R+R
3	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment to the diagnostic socket and check: - for the presence of not activated control units on the CAN - for the presence of non configured control units on the CAN - that there are no errors in the TEG-Reader node - that there are no errors on the B-CAN - correct miniCrypt code - correct miniCrypt code	Move on to Step 4	Control units inactive	Continue following the instructions for the diagnostic equipment
			Control units not configured	Continue following the instructions for the diagnostic equipment
			Key not recognized/not programmed	Programme the key (see operation 0520G85 - SYSTEM CODE - Check using the EXAMINER)
			Key cancelled/disabled	Replace the key and programme it (see operation 0520G85 - SYSTEM CODE - Check using the EXAMINER)
			Transponder with incorrect secret code	Replace the key with a secret code that conforms and programme it (see operation 0520G85 - SYSTEM CODE - Check using the EXAMINER)
			Transponder defective or missing	Replace the key with a secret code that conforms and programme it (see operation 0520G85 - SYSTEM CODE - Check using the EXAMINER)
			B-CAN short circuited or earthed or open circuit	Restore B-CAN line See E1050 CAN CONNECTION LINES
			Minikript code not correctly programmed	Move on to Step 6
4	IGNITION CHECK	All OK	Problems encountered	Operation
	Check correct ignition supply/signals See Test 5520AA CHECK ON IGNITION SWITCH EFFICIENCY	Move on to Step 5	1. Wiring at TEG-Reader defective.	1. Restore correct wiring at TEG-Reader.
			2. Teg-Reader defective.	2. Replace the ignition Op. 5520A10 IGNITION SWITCH ASSEMBLY - R+R
			3. Aerial inside Teg-reader faulty	3.Replace the ignition Op. 5520A10 IGNITION SWITCH ASSEMBLY - R+R
5	STEERING LOCK CHECK	All OK	Problems encountered	Operation
	Check correct steering lock power supply/signals See Test 5580ED ELECTRIC STEERING LOCK CHECK	Move on to Step 6	1. Wiring between Teg-reader and steering lock defective.	1. Restore the correct wiring.
		Move on to Step 6	2. Steering lock defective.	2. Replace the steering lock Op. 5580E17 STEERING LOCK - R.R
6	CHECK CORRECT PROGRAMMING OF MINIKRYPT CODE IN TEG-READER NODE	All OK	Problems encountered	Operation
	Connect the diagnostic equipment and enter active diagnosis in the Teg-Reader node. Key in the secret code written on the vehicle code card into the diagnostic equipment. Check that the Teg-Reader node recognizes the code	Move on to Step 7	Teg-Reader with incorrectly programmed minikrypt code	Replace the ignition Op. 5520A10 IGNITION SWITCH ASSEMBLY - R+R
7	CHECK CORRECT PROGRAMMING OF MINIKRYPT CODE IN THE STEERING LOCK NODE	All OK	Problems encountered	Operation
	Connect the diagnostic equipment and enter active diagnosis in the steering lock node. Key in the secret code written on the vehicle code card into the diagnostic equipment. Check that the steering lock node recognizes the code	Move on to Step 8	Steering lock with incorrectly programmed minikrypt code	Replace the steering lock node Op. 5580E17 STEERING LOCK - R.R
8	CHECK CORRECT PROGRAMMING OF MINIKRYPT CODE IN THE BODY COMPUTER NODE	All OK	Problems encountered	Operation
	Connect the diagnostic equipment and enter active diagnosis in the Body Computer. Key in the secret code written on the vehicle code card into the diagnostic equipment. Check that the Body Computer node recognizes the code	Move on to Step 9	Body Computer with incorrectly programmed minikrypt code	Replace Body Computer Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R
9	CHECK CORRECT PROGRAMMING OF MINIKRYPT CODE IN THE ENGINE MANAGEMENT CONTROL UNIT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment and enter active diagnosis in the engine management control unit. Key in the secret code written on the vehicle code card into the diagnostic equipment. Check that the engine management control unit node recognizes the code	End of diagnosis	Engine management control unit with incorrectly programmed minikrypt code	Replace engine control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R

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Parts & tools for this job For 2005 Fiat Croma

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