XANTIA - XM
RECOMMENDATIONS - PRECAUTIONS : AL 4 and 4 HP 20 AUTOMATIC GEARBOXES
Engines : LFY - RFV - RFN - XFZ - DHX
PROCEDURE BEFORE REPAIRS (continued)
When the ECU detects an erroneous or non-existent value
on input or output :
Reading the fault codes.
- Read the fault codes.
- It writes the fault in memory.
- For each associated context, it writes the context of the oldest fault
in memory.
No fault codes present :
Carry out a measure of parameters.
- It initiates a back-up mode strategy.
Anomalies present :
YES : Carry out the necessary repairs.
NO : Read the fault codes – engine ECU
There are two types of back-up modes :
•
•
- The ECU makes replacement values available (relating to comfort,
gear selection quality, loss of functions).
- Carry out a road test.
Following an initialisation of the ECU, for a certain period of time
there may be an inconsistent gear selection quality (while ECU
parameters are adapted to the gearbox).
- Access to emergency programme (only 3rd ratio and reverse are
available).
To achieve a consistent standard, it will be necessary to carry out a
road test taking in frequent gear changes (auto-adaptive laws).
Note : 4 HP 20 : A snatching may be felt when changing :
P/R - N/R - N/D.
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