Toyota Prius 2010 Repair Manual page 337

Symptom
Pressure is too high on both low
and high pressure sides
Frost or a large amount of
condensation on piping on low
pressure side
(9) Insufficient compressor compression
Symptom
Pressure is too high on both low
and high pressure sides
Pressure is too low on high
pressure side
Gauge readings (Reference)
2010 Toyota Prius
Probable Cause
Expansion valve
may be stuck
Probable Cause
Internal leak in
compressor
Diagnosis
Excessive refrigerant in
low pressure piping
Expansion valve opened
too wide
Diagnosis
Low compression
Leak from a damaged valve,
or parts may be broken
Corrective
Action
Check
expansion
valve
Corrective
Action
Replace
compressor
Repair Manual