125000475 - C12 THE GEARS DO NOT ENGAGE
Reverse gear cannot be engaged sometimes| Results of the tests | ||||
| 0 | OIL LEVEL CHECK | All OK | Problems met | Operation |
|---|---|---|---|---|
| Check the oil level as described in See Test See Test 2127B OIL LEVEL CHECK | Continue to Step 2 | Level below the Max reference | Top up the oil levelContinue to Step 1 | |
| Level above the Max reference | Reduce to the Max levelContinue to Step 2 | |||
| 1 | CHECK FOR OIL LEAKS | All OK | Problems met | Operation |
| Check that there are no oil leaks as described in See Test See Test 2127C HYDRAULIC GEAR SELECTION SYSTEM | Continue to Step 2 | Oil leaks detected in the clutch assembly | Carry out the clutch bleeding procedure in active diagnosis using the ExaminerContinue to Step 2 | |
| Oil leaks detected in other parts of the hydraulic unit | Replace/repair the parts concerned, and top up the oil levelContinue to Step 1 | |||
| 2 | OIL PRESSURE CHECK | All OK | Problems met | Operation |
| Check the amount of oil present and continue with the topping upCheck the oil pressure as described in See Test See Test 2127D OIL PRESSURE CHECK | Continue to Step 4 | Pressure < 40 bar | Continue to Step 3 | |
| 3 | ELECTRIC PUMP OPERATION CHECK | All OK | Problems met | Operation |
| Check the correct operation of the pump as described in See Test See Test 2127E ELECTRIC SPEED SELECTION SYSTEM | Continue to Step 4 | Voltage below 11 V | Check the batteryContinue to Step 3 | |
| It is not possible to make gear changes from the lever | Activate the ''clutch bleed'' service from the Examiner Plus or Smart to activate the pumpContinue to Step 4 | |||
| 4 | GEAR LEVER CHECK | All OK | Problems met | Operation |
| Check that the gear lever is working properly following See Test See Test 2127L GEAR LEVER CHECK | Continue to Step 5 | The lever states displayed are not correct | Check the wiring and the switches/gear lever Repair/replace the part that is not working | |
| There is no change of state and/or the ''CITY'' button is not displayed | Check the switch and the wiring Repair/replace the part that is not working | |||
| 5 | CONTROL UNIT ERRORS CHECK | All OK | Problems met | Operation |
Check that there are no control unit errors. In particular:
| Continue to Step 10 | Presence of one or more of the errors included in the list | Continue to Step 6 | |
| 6 | CHECKS ON FAULTS DETECTED | All OK | Problems met | Operation |
| Check the faults according to See Test See Test 2127I What to do for error in Selespeed control unit | Continue to Step 8 | Faulty connections (Clutch sensor, Odd or even gear engagement, Clutch solenoid Current error, Selection solenoid valve error, Control unit earth error and/or Load relay error) | Repair/replace the wiringContinue to Step 8 | |
| The state displayed is not correct (lever switch error 0/1/2/3) | Check the connections, continuity of the wiring and the gear leverContinue to Step 8 | |||
| The active diagnosis has not been successful and there are no faults detected at the wiring (Odd or even gear engagement, Selection solenoid valve error and/or Clutch solenoid valve current error) | Continue to Step 7 | |||
| Battery run down (Load relay error) | Restore the correct battery charge Op. 5530C14Continue to Step 6 | |||
| 7 | AFTER THE SOLENOID VALVE ACTIVE DIAGNOSIS | All OK | Problems met | Operation |
| If this step has been reached for the active diganosis of the clutch solenoid valve, replace it Op. 2127C56and check its operation by carrying out a C.M.If this step has been reached for the active diagnosis of the selection solenoid valve, replace it Op. 2127C54and check its operationIf this step has been reached for the active diagnosis of the engagement solenoid valve, replace it Op. 2127C52and check its operation | Continue to Step 8 | . | ||
| 8 | POTENTIOMETER REPLACEMENT | All OK | Problems met | Operation |
| If there is a clutch sensor error and no faults are detected at the connections/wiring, replace the clutch potentiometer Op. 2127E44and check that the position reading is correct by carrying out a series of C.M. | Continue to Step 9 | . | ||
| 9 | AFTER THE CHECKS ON THE FAULTS DETECTED | All OK | Problems met | Operation |
| Check that the fault is no longer present | End of diagnosis | The fault persists | Continue to Step 10 | |
| 10 | CHECK THAT THE CLUTCH IS NOT DRAGGING | All OK | Problems met | Operation |
| Check that the clutch is not dragging following See Test See Test 2127K CLUTCH DRIVE CHECK | End of diagnosis | The clutch drags | Replace the clutch mechanism Op. 1810A28Continue to Step 11 | |
| 11 | AFTER OPERATION ON CLUTCH KIT | All OK | Problems met | Operation |
| Check that the fault is no longer present | End of diagnosis | The fault persists | Contact Technical Service for further information on the problem | |