| 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 | Engine oil level not correct | Adjust oil level |
| Oil leaks | Eliminate leaks |
| Coolant level not correct | Top up level |
| Coolant leaks | Eliminate leaks |
| Radiator blocked | 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 for versions with air conditioning onlyMove on to Step 3 for all versions | Error detected in the control unit | Continue following the instructions on the diagnostic equipment |
| Parameters not plausible | 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 | Onset of the error detected in the control unit | Continue following the instructions on the diagnostic equipment |
| Parameters not plausible | 2. Continue following the instructions on the diagnostic equipment |
| 3 | WATER TEMPERATURE SENSOR CHECK | All OK | Problems encountered | Operation |
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| For 1.4 16v versionsCheck that the water temperature sensor is working properly by carrying out the See Test 1056BC Engine coolant temperature sensor operation check | Move on to Step 4 | Sensor defective | Replace the sensor Op. 1056B50 ENGINE COOLANT TEMPERATURE SENSOR - R + R |
| Sensor wiring connection irregular | Restore the correct connection. |
| 3 | For 1.9 JTD 8v/16v versionCheck that the water temperature sensor is working properly by carrying out the See Test 1056BC Engine coolant temperature sensor operation check | | Sensor defective | Replace the sensor |
| Sensor wiring connection irregular | 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 unitCheck that the fan control relays are working properly See E5020 ENGINE COOLING | Move on to Step 5 | Wiring defective | Restore the correct wiring. |
| Relays defective | 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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| For 1.4 16v versionsCheck 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 |
| 6 | For 1.9 JTD 8v/16v versionsCheck that the engine control unit is working properly | End of diagnosis | Engine management control unit defective | Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R |