21B-3
MR-413-X44-21B000$059.mif
V2
Vdiag No: 04SEQUENTIAL GEARBOX
Fault finding - Introduction21B
Faults
Faults are declared as either present or stored (depending on whether they appeared in a certain context and have
disappeared since, or whether they remain present but have not been diagnosed within the current context).
The present or stored status of faults should be taken into consideration when the diagnostic tool is switched on
after the + after ignition feed (without any system components being active).
For a present fault, apply the procedure described in the Interpretation of faults section.
For a stored fault, note the faults displayed and apply the instructions in the Notes section.
If the fault is confirmed when the instructions in the Notes section are applied, the fault is present. Deal with the fault
If the fault is not confirmed, check:
–the electrical lines which correspond to the fault,
–the connectors on these lines (corrosion, bent pins, etc.),
–the resistance of the component detected as faulty,
–the condition of the wires (melted or split insulation, wear).
Conformity check
The aim of the conformity check is to check data that does not produce a fault on the diagnostic tool because the
data is inconsistent. Therefore, this stage is used to:
–carry out fault finding on faults that do not have a fault display, and which may correspond to a customer
complaint.
–check that the system is operating correctly and that there is no risk of a fault recurring after repairs.
This section gives the fault finding procedures for statuses and parameters and the conditions for checking them.
If a status is not behaving normally or a parameter is outside the permitted tolerance values, consult the
corresponding fault finding page.
Customer complaints - Fault finding chart
If the test with the diagnostic tool is OK but the customer complaint is still present, the fault should be processed by
customer complaint.
A summary of the overall procedure to follow is provided on the following page
in the form of a flow chart.
21B -135
MR-413-X44-21B000$944.mif
V2
SEQUENTIAL GEARBOX
Diagnostic - Fault finding chart
Vdiag No: 04
21B
ALP 9 Inadequate reaction to full load request
NOTESSpecial notes:
Only consult this customer complaint after a complete check with the diagnostic tool.
Carry out a road test and check for a hard point on the accelerator pedal under full load and on consecutive
downshifting.
If the hard point is noticeable on the pedal but not when downshifting, perform another road test with the selector
in automatic mode.
If downshifting is still not active, use the diagnostic tool to check that status ET030 Accelerator pedal position
varies depending on the pedal position.
Check the operation of the pedals (pedal travel fault or pedal potentiometer damaged).
If the fault is still present, check the injection system (see 17B, petrol injection).
AFTER REPAIRClear the computer fault memory. Switch off the ignition and wait 20 seconds.
Carry out a road test followed by another check with the diagnostic tool.
BVRJH1_V04_ALP9
