CITROEN C5 Handbook page 166

RECOMMENDATIONS - PRECAUTIONS (AL 4 and 4 HP 20 AUTOMATIC GEARBOXES)
Downloading. (AL 4 and 4 HP 20)
Updating the gearbox ECU by downloading :
- Follow the procedure using the diagnostic equipment.
The operation of downloading is used to update the automatic gearbox ECU or to adapt it to evolutions of the engine ECU.
After downloading, carry out the following :
- Note down the value in the oil usage counter present in the automatic gearbox ECU.
- Delete the fault codes.
- Again note down the value in the oil usage counter and compare it with the value previously read.
- Pedal initialisation (AL 4)
- Configuration (if needed) (AL 4)
- A reinitialisation of the autoadaptives (AL4 and 4 HP 20).
- A road test (AL 4 and 4 HP 20).
Engines : 6FZ - RFN - RHZ - XFX - 4HX
ECU : Downloading, Configuration, Initialisation (Pedal).
Following the diagnostic tool procedure.
IMPERATIVE : Every update of the automatic gearbox ECU must
be accompanied by an update of the engine ECU.
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C5 - All Types