| | Test results |
| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| Check the following, in order:- correct engine oil level;- possible oil leaks;- correct coolant level;- possible coolant leaks;- radiator blocked; | Move on to Step 1 | 1. Engine oil level not correct.2. Oil leaks.3. Coolant level not correct.4. Coolant leaks.5. Radiator blocked. | 1. Top up to the correct oil level2. Eliminate leaks.3. Top up to the correct oil level4. Eliminate leaks.5. Descale radiator. |
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| 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 2 | 1. Error detected in the control unit.2. Parameters not plausible. | 1. Continue following the instructions on the diagnostic equipment.2. Continue following the instructions on the diagnostic equipment. |
| 2 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
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| 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 3 | 1. Onset of error detected in the control unit.2. Parameters not plausible. | 1. Continue following the instructions on the diagnostic equipment.2. Continue following the instructions on the diagnostic equipment. |
| 3 | WATER TEMPERATURE SENSOR CHECK | All OK | Problems encountered | Operation |
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| Check that the water temperature sensor is working properly. See Test 1056BC ENGINE COOLANT TEMPERATURE SENSOR OPERATION CHECK | Move on to Step 4 | 1. Sensor defective.2. Sensor wiring connection irregular. | 1. Replace the sensor. Op. 1056B50 ENGINE COOLANT TEMPERATURE SENSOR - R + R 2. Restore the correct connection. |
| 4 | WIRING CHECK | All OK | Problems encountered | Operation |
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| Check the continuity of the connections between the engine management control unit and fuse control unit.Check that the fan control relays are working properly. See E5020 ENGINE COOLING | Move on to Step 5 | 1. Wiring defective.2. Relays defective | 1. Restore the correct wiring.2. Replace the relays |
| 5 | THERMOSTAT CHECK | All OK | Problems encountered | Operation |
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| Check that the thermostat is working properly. | Move on to Step 6 | Thermostat defective. | Replace the thermostat. Op. 1088C40 THERMOSTAT- R + R |
| 6 | ENGINE CONTROL UNIT CHECK | All OK | Problems encountered | Operation |
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| Check that the engine control unit is working properly. | End of diagnosis | Engine management control unit defective. | Replace the engine management control unit Op. 1056B82 INJECTION/IGNITION SYSTEM E.C.U. (ONE) - R + R |