199000755 - D033 ELECTRIC FAN STAYS ON ALL THE TIME

Test results
1WATER TEMPERATURE SENSOR CHECKAll OKProblems encounteredOperation
Check that the water temperature sensor is working properly by carrying out the    See Test 1056BC Engine coolant temperature sensor operation checkMove on to Step 4Sensor defectiveReplace the sensor    Op. 1056B50 ENGINE COOLANT TEMPERATURE SENSOR - R + R
Sensor wiring connection irregularRestore the correct connection.
2CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Connect the Examiner diagnostic equipment to the engine control unit.Check:- that there are no errors in the control unit;- parameter plausibility.Move on to Step 2Error detected in the control unitContinue following the instructions on the diagnostic equipment
Parameters not plausibleContinue following the instructions on the diagnostic equipment
3CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Connect the Examiner diagnostic equipment to the climate control system control unit.Check:- that there are no errors in the control unit;- parameter plausibility.Move on to Step 3Onset of the error detected in the control unitContinue following the instructions on the diagnostic equipment
Parameters not plausibleContinue following the instructions on the diagnostic equipment
4WIRING CHECKAll OKProblems encounteredOperation
Check the continuity of the connections between the engine management control unit and fuse control unitCheck that the fan control relays are working properly    See E5020 ENGINE COOLING Move on to Step 5Wiring defectiveRestore the correct wiring.
Relays defectiveReplace the relays
5THERMOSTAT CHECKAll OKProblems encounteredOperation
Check that the thermostat is working properlyMove on to Step 6Thermostat defectiveReplace the thermostat    Op. 1088C40 THERMOSTAT- R + R
6ENGINE CONTROL UNIT CHECKAll OKProblems encounteredOperation
Check that the engine control unit is working properlyEnd of diagnosisEngine management control unit defectiveReplace the engine management control unit    Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R