Mazda CT-L1005, Руководство по обучению

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Basic Climate Control Diagnosis and Repair
Control System Check
•
Using the Datalogger of the WDS, the PCM control strategy for the A/C system can be
checked:
–
The input signal from the low- / high-pressure switch to the PCM can be checked
using the PID
AC_REQ . If the pressure in the A/C system is within specification (see
the workshop manual for the specific values), AC_REQ should display ON.
–
The output signal from the PCM to the A/C relay can be checked using the PID
ACCS# . When all conditions for the activation of the compressor are met, ACCS#
should indicate ON.
–
The input signal from the medium pressure switch to the PCM can be checked using
the PID
COLP . If the pressure in the A/C system exceeds a certain value (see the
workshop manual for the specific value), COLP should read ON.
•
In addition, the user can actively send an output signal to the A/C relay to check the
integrity of the control circuit. To do this, the PID
ACCS# must be activated using the
OSC ( O utput S tate C ontrol) function of the WDS. Then a cut-in / cut-out noise should be
audible from the magnetic clutch when ACCS# is set to ON / OFF.
NOTE: Depending on the model, the availability of the PIDs varies. In addition, different PID
names are used for identical parameters (see the workshop manual for details).
A/C Service Machine
•
The A/C service machine is used to drain and refill the refrigerant in the A/C system.
•
An A/C service machine also requires maintenance, and this should be done in
accordance with the manufacturer’s guidelines.
NOTE : The differences between the compressor oils are not so drastic as to require that the
service equipment be flushed between servicing two vehicles with different types of
PAG oil.
Curriculum Training 05-5