Procedure Before A Repair - CITROEN C4 2004 Handbook

RECOMMENDATIONS - PRECAUTIONS (AL4 AUTOMATIC GEARBOX)
When the ECU detects a value that is incorrect or absent on one
of its inputs or outputs:
- It writes the fault into memory.
- For each type of associated context, it records the context of the
earliest fault into memory.
- It launches a back-up mode strategy.
There are two sort of back-up mode:
- The ECU uses replacement values (impact on comfort, gear changing
quality, loss of functions).
- Change to emergency mode (only 3rd gear and reverse gear are
available).
Engines: NFU - RFJ

PROCEDURE BEFORE A REPAIR

Reading of fault codes.
Carry out a reading of the fault codes.
- Absence of fault codes.
Carry out a measuring of parameters.
Presence of faults confirmed:
- YES: Perform the necessary repairs.
- NO: Read the fault codes: engine ECU.
Carry out a road test.
Having carried out an ECU initialisation procedure, for a certain time
one may obtain gear changing quality that is more or less good
(adaptation of the ECU parameters to the gearbox).
To improve the quality, it is necessary to perform a road test with
frequent changing through the gears (auto-adaptive laws).
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