242
CLUTCH
GEARBOX
DRIVESHAFTS
RECOMMENDATIONS - PRECAUTIONS : AL 4 AUTOMATIC GEARBOX
Engines : NFZ - NFU - RFN
PROCEDURE BEFORE REPAIRS (continued)
When the ECU detects an erroneous or absent valueon input or
output :
- It writes the fault in memory.
- For each associated context, it writes the context of the oldest fault
in memory.
- It initiates a back-up mode strategy.
There are two types of back-up modes :
- The ECU makes replacement values available (relating to comfort,
gear selection quality, loss of functions).
- Access to emergency programme (only 3rd gear and reverse are
available)
Reading the fault codes.
Read the fault codes.
- Absence of fault codes:
- Carry out a measure of parameters.
Presence of anomalies:
- YES : Carry out the necessary repairs.
- NO : Read the fault codes - engine ECU
- 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 adapting to the gearbox).
To achieve a consistent standard, it will be necessary to carry out a
road test taking in frequent gear changes (auto-adaptive laws).
XSARA
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