198001706 - D072 CRUISE CONTROL SET+ CONTROL NOT WORKING

The Cruise Control system does not increase the speed when the control wheel is turned to "SET+".

For safety reasons the Cruise Control is inhibited above a maximum speed and below a minimum speed. If these speeds are exceeded the Cruise Control no longer works

0	PRELIMINARY CHECK	All OK	Problems encountered	Operation
	Check, by carrying out a road test, that the vehicle speed is higher than 40 km/h when the SET+ ring nut is adjusted	Move on to Step 1	Speed below 40 Km/h	Bring the speed to above 40 Km/h
1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket.Check for the presence of faults in the engine management control unit	Move on to Step 2	Error detected in the control unit	Continue following the instructions on the diagnostic equipment
			No communication with the control unit	Restore the connection between the engine management control unit and the diagnostic connector    See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
2	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the diagnostic equipment to the engine management control unit.Check that the lever SET+ position is recognized.Check that the Cruise Control contacts are working properly, carrying out    See Test 5580AB CRUISE CONTROL SET + CONTROL CHECK	Move on to Step 3	No continuity for lever contacts	Replace the steering column lever with built-in Cruise Control    Op. 5580A10 CRUISE CONTROL LEVER ASSEMBLY - R+R
3		All OK	Problems encountered	Operation
	Check that the fault is no longer present, by carrying out    See Test 5580AE CRUISE CONTROL OPERATION ROAD TEST CHECK	End of diagnosis	The fault persists: engine management control unit defective	Replace the engine management control unit    Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R