| 0 | PRELIMINARY CHECKS | All OK | Problems encountered | Operation |
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| First of all, check the efficiency of the battery | Move on to Step 1 | Battery run down | Recharge the battery |
| Battery run down and cannot be recharged | Replace the battery |
| 1 | BATTERY CONNECTIONS CHECK | All OK | Problems encountered | Operation |
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| Check the following, in order:- correct fastening and earth connection of the negative battery terminal;- correct fastening of positive battery terminal and all leads connected to it;- no oxidation at the earth point for the negative battery lead | Move on to Step 2 | Connections not correct | Restore the correct connections See E1010 POWER SUPPLY |
| Earth lead damaged | Replace the lead |
| Lead between battery and starter motor damaged | Replace the lead |
| 2 | IGNITION SWITCH CIRCUIT CHECK | All OK | Problems encountered | Operation |
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| Check that the power supply is reaching the ignition switch correctly See E5010 STARTING AND RECHARING | Move on to Step 3 | Connections not correct | Restore the connections between the battery and the ignition switch. |
| 3 | KEY LOCK BARREL CHECK | All OK | Problems encountered | Operation |
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| Check the condition of the key lock barrel and that it is working properly | Move on to Step 4 | Lock barrel faulty | Repair or replace the lock barrel Op. 5520A14 IGNITION KEY LOCK BARREL - R+R |
| 4 | IGNITION SWITCH CHECK | All OK | Problems encountered | Operation |
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| Check the condition of the ignition switch and make sure that it is working properly | End of diagnosis | Ignition switch fault | Repair or replace the ignition switch Op. 5520A10 IGNITION SWITCH ASSEMBLY - R+R |