312003026 - U0426 Electronic key

The error is detected when the key code is incorrect and the key invalidity message is transmitted on the CAN from the protection system (with detail incorrect key code), the code for the control unit si different from the one memorized in the protection system (with detail unrecognized code), a time out has occurred, the engine management control unit has sent the code request, but the protection system has not responsed (with detail no code received) or the engine management control unit is programmed and receives a universal code (with detail Body Computer not programmed).

		Test results
1	ERROR DETAIL CHECK	All OK	Problems encountered	Operation
	1. Check, using the diagnostic equipment, that the detail for error U0426 is "Incorrect key code"	Move on to Step 2	The detail is "Unrecognized code"	Move on to Step 4
			The detail is "No code received"	Move on to Step 6
			The detail is "Body Computer not programmed"	Move on to Step 8
2	KEY CHECK	All OK	Problems encountered	Operation
	Try and see whether the other keys that came with the vehicle are working normally	Move on to Step 3	The other keys are also not working	Replace Body Computer    Op. 5505A32 BODY COMPUTER - R.R
3	KEY PROGRAMMING	All OK	Problems encountered	Operation
	Using the diagnostic equipment, programme the keys checking that the result is positive and the fault has disappeared	End of diagnosis	The faulty key cannot be programmed	Replace the faulty key
			The fault persists even after the programming	Replace Body Computer    Op. 5505A32 BODY COMPUTER - R.R
4	EMERGENCY STARTING	All OK	Problems encountered	Operation
	Check that the recovery code from the diagnostic equipment is accepted and that the engine starts	Move on to Step 5	The recovery code is accepted and the engine starts	Replace Body Computer    Op. 5505A32 BODY COMPUTER - R.R
5	REPLACING THE ENGINE MANAGEMENT CONTROL UNIT	All OK	Problems encountered	Operation
	The engine management control unit has been programmed on another vehicle or is broken: replace it    Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R	End of diagnosis	-	-
6	ENGINE CONTROL UNIT CONNECTION CHECK	All OK	Problems encountered	Operation
	Check that the CAN connections between the engine management control unit and the Body Computer are not faulty. In particular, that there are no open circuit or short circuit problems    See E1050 CAN CONNECTION LINES	Move on to Step 7	There are faulty connections	Restore or, if necessary, replace the wiring
7	BODY COMPUTER CONNECTIONS CHECK	All OK	Problems encountered	Operation
	Check that the Body Computer is correctly supplied and is receiving an ignition controlled power supply    See E5010 STARTING AND RECHARING	Move on to Step 9	There are faulty connections	Restore or, if necessary, replace the wiring
			Ignition switch broken	Replace the ignition switch    Op. 5520A10 IGNITION SWITCH ASSEMBLY - R+R
8	BODY COMPUTER PROGRAMMING CHECK	All OK	Problems encountered	Operation
	Check that the CODE warning light in the control panel is flashing	Move on to Step 9	The CODE warning light is not flashing, but remains on constantly	Move on to Step 5
9	BODY COMPUTER REPLACEMENT	All OK	Problems encountered	Operation
	The Body Computer has not been programmed or is broken: replace it    Op. 5505A32 BODY COMPUTER - R.R	End of diagnosis	-	-