4. INSPECT AIR CONDITIONING PRESSURE SENSOR (SENSOR SIGNAL CIRCUIT)
(a) Measure the voltage when the following conditions are satisfied.
Vehicle Doors Fully open
Temperature Setting MAX COLD
Blower Speed HI
A/C Switch On
R/F Switch Recirculation
Interior Temperature 25 to 35°C (77 to 95°F)
Engine Speed 2000 rpm
f refrigerant pressure on the high pressure side becomes extremely high during the inspection (if the
voltage exceeds 4.8 V), the fail-safe function stops compressor operation. Therefore, measure the voltage
before the fail-safe operation.
It is necessary to measure the voltage for a certain amount of time (approximately 10 minutes) because
the malfunction may recur after a while.
When the outside air temperature is low (below -1.5°C (29.3°F)), the compressor stops due to operation of
the ambient temperature sensor and the evaporator temperature sensor to prevent the evaporator from
freezing. In this case, perform the inspection in a warm indoor environment.
(1) Measure the voltage according to the value(s) in
A14-5 (PRE) - Body
Refer to above "Procedure
0.74 to 4.71 V
Text in Illustration
Component with harness connected
(Air Conditioning Amplifier Assembly)
OK (When troubleshooting according to the DTC) A
OK (When troubleshooting according to Problem