125000477 - C14 THE GEARS DO NOT ENGAGE
It skips a gear/the requested gear is not engaged. | If no errors are detected, the problem could be due to incorrect use of the vehicle by the customer. |
| 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 | Replace/repair the parts concerned, and top up the oil levelContinue to Step 1 | |||
Check that there are no control unit errors. In particular:
| Continue to Step 4 | Presence of one or more of the errors included in the list | Continue to Step 1 | |||
| Check the faults according to the See Test See Test 2127I What to do for error in Selespeed control unit | Continue to Step 2 | Faulty connections | Repair/replace the wiringContinue to Step 2 | |||
| 2 | SENSOR REPLACEMENT | All OK | Problems met | Operation | ||
If there is a gear engagement sensor error and no faults are detected at the connections/wiring, replace it Op. 2127E42and check that the position reading is correct by carrying out a series of C.M.
| Continue to Step 3 | . | ||||
| 3 | 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 4 | |||
| 4 | PARAMETERS CHECK USING THE EXAMINER | All OK | Problems met | Operation | ||
| Check that the failed engagements counters in the parameters environment (failed engagement counters for: neutral, 1st-5th and reverse) are all at zero. | Continue to Step 7 | These counters are at a value different from zero | Make a note of/print out the screen showing the failed engagement counters.Continue to Step 5 | |||
| 5 | SELF CALIBRATION | All OK | Problems met | Operation | ||
| With the Examiner Plus or Smart, in active diagnosis start end-of-line/Service self-calibration | Continue to Step 6 | The self-calibration is not successful | Continue according to the instructions for the diagnostic equipment | |||
| 6 | ROAD TEST | All OK | Problems met | Operation | ||
| Carry out a road test, making sure to make as many gear changes as possible with all the available gears (under different engine speed and load conditions). Check the failed engagement counters in the parameters environment (failed engagement counters in: neutral, 1st-5th and Reverse).
| End of diagnosis | There is a significant increase for one or more counters | Continue to Step 7 | |||
| 7 | SLOW FINGER CHECK | All OK | Problems met | Operation | ||
| Using the Examiner Plus or Smart in active diagnosis, launch the procedure for checking the slow finger | Continue to Step 8 | The finger is slow | Replace the finger fixing boltContinue to Step 8 | |||
| 8 | THE FAULT PERSISTS | All OK | Problems met | Operation | ||
The fault may be caused by false contacts on the gear lever: check the state of the connections and wiring for the lever.
| End of diagnosis | . | ||||