| 1 | ERRORS IN CONTROL UNIT CHECK | All OK | Problems encountered | Operation |
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| Check that there are no errors in the control unit. More specifically:- Lever switch error | End of diagnosis | Presence of error indicated | Move on to Step 2 |
| 2 | GEAR LEVER CHECK | All OK | Problems encountered | Operation |
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| - Connect the Examiner diagnostic equipment and select the "LEVER STATUS" display.- Make all possible gear lever selections (one at a time) checking the correct status change on ExaminerCheck that the gear lever is working properly, carrying out the See Test 2127OL GEAR LEVER CHECK | End of diagnosis | Incorrect status displayed for faulty gear selection switch | Replace gear selection lever Op. 2127A12 HAND LEVER FOR MANUAL GEARBOX WITH HYDRAULIC SELECTION - R.R. |
| Faulty wiring between gearbox control unit and gear selection lever | Check connections and wiring continuity See E7051 ROBOTIZED GEARBOX |
