INSTRUCTIONS MANUAL
-64-
DYNAMIC DIAGNOSIS
(optional))
DYNAMIC DIAGNOSTICS is an additional machine function that permits diagnosing the
causes of malfunctions in vehicle A/C systems by analyzing system pressures. Testing may be
conducted on Orifice tube system with cycling compressor systems, Expansion Valve (TXV)
systems, and Orifice tube system with constant running compressor systems.
Orifice tube system with cycling compressor:
a system making use of a flooded
evaporator, a capillary valve (orifice tube), and a defroster pressure switch on the low-pressure
side.
Expansion Valve (TXV) system
: a system making use of a thermostatic expansion valve
assembly including a relief valve.
Orifice tube system with constant running compressor:
a system making use of a capillary
valve (orifice tube) and a variable-displacement compressor.
For additional information about DESCRIPTION OF COMPONENTS and PREPARING FOR
DIAGNOSTICS refer to Dynamic diagnostics instructions [MANUSBB005]
From the MANUAL PROCEDURE, select DEVICES:
Then select DIAGNOSIS, the following screen will be displayed:
Select DYNAMIC DIAGNOSIS, the following screen will be displayed:
select the A/C system type and press OK
NOTE:
Incorrect selection of A/C system type may falsify diagnostic results.
The following screen will be displayed:
R134a DEVICES
DYNAMIC DIAGNOSIS
STATIC DIAGNOSIS
R134a DEVICES
DIAGNOSIS
TYPE OF A/C SYSTEM:
THERMAL EXPANSION VALVE
ORIFICE TUBE
ORIFICE TUBE W.CONST.RUNN.COMP.
R134a DEVICES
DYNAMIC DIAGNOSIS
