62C-3
MR-413-X44-62C000$091_eng.mif
V1
MANUAL AIR CONDITIONING
Fault finding - Introduction62C
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.
Special notes regarding conformity checks for the air conditioning system:
The air conditioning system conformity check is divided into four parts. The parts relate to the four sub-functions of
the air conditioning system: heating, cold loop, user selection and passenger compartment ventilation. The statuses
and parameters related to these sub-functions are listed with their respective computers.
Special notes: The air conditioning control panel does not control electrical components (other than the passenger
compartment fan assembly) and it cannot support fault finding.
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. Note:
The interpretation of statuses, parameters and commands is also split into several sections. Everything controlled
by the air conditioning control panel is explained in the two Air conditioning sections (62B and 62C). On the
other hand, signals from other computers are explained in the fault finding sections for these computers (see
conformity check).
A summary of the overall procedure to follow is provided on the following page in the
form of a flow chart.
