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| 1 | CONTINUITY CHECK | All OK | Problems encountered | Operation |
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| Check the connection from the engine management control unit to the control panel See E4010 INSTRUMENT PANEL | Move on to Step 2 | Wiring from engine management control unit to control panel broken | Restore the correct connection |
| 2 | INSTRUMENT PANEL CHECK | All OK | Problems encountered | Operation |
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| Check the operation of the control panel | Move on to Step 3 | Instrument panel defective | Replace the control panel Op. 5560B10 CONTROL PANEL - R+R |
| 3 | ENGINE MANAGEMENT CONTROL UNIT CHECK | All OK | Problems encountered | Operation |
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| Check that the engine management control unit is working properly | End of diagnosis | Engine management control unit defective | Replace the control unit Op. 1056F82 CONTROL UNIT SINGLE OF INJECTION IGNITION SYSTEM R R |