939003579 - D070 CRUISE CONTROL NOT WORKING UNDER ANY CONDITIONS

The Cruise Control system controls do not work under any circumstances
1CHECK USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION
Connect the diagnostic test equipment (Examiner or other instruments) to the tester input.Check for the presence of faults in the engine management control unitMove on to Step 21. Error detected in the control unit1. Continue following the instructions for the diagnostic equipment
2. No communication with the control unit2. Restore the connection between the engine management control unit and the diagnostic connector: wiring diagram    See E5060 CRUISE CONTROL
2CRUISE CONTROL SELECTOR CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check that the Cruise Control contacts are working properly    See Test 5580AA Cruise Control ON/OFF control checkMove on to Step 3No continuityReplace the Cruise Control lever assemblySee Test 5580A10 CRUISE CONTROL LEVER ASSEMBLY - R+R
3SUPPLY CHECKALL OKPROBLEMS ENCOUNTEREDACTION
With the ignition key in the ON position and the Cruise Control ON, check that there is a voltage signal from the Cruise Control to the engine management control unit:    See E5060 CRUISE CONTROLMove on to Step 41.No voltage detected1.Repair the connections:    See E5060 CRUISE CONTROL
2.Fuse broken2.Replace the fuse after having eliminated the cause
4CONNECTIONS CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the electrical continuity of the wiring between the junction unit, ignition switch, engine management control unit and Cruise Control system control:    See E5060 CRUISE CONTROLMove on to Step 5No continuityRepair the connections:    See E5060 CRUISE CONTROL
5CHECK ON CORRECT OPERATIONALL OKPROBLEMS ENCOUNTEREDACTION
Check that the fault is no longer presentEnd of diagnosisThe fault persists: control unit defectiveReplace the engine management control unit    Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R