On-Vehicle Inspection

WARNING: This page is about a different car, the 2004 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT EXPANSION VALVE
1. Check amount of gas during refrigeration cycle.
2. Set on manifold gauge set.
3. Start the engine.
4. Operate the A/C system.
5. Inspect the expansion valve.
  1. Run the engine at 1,500 RPM for at least 5 minutes.
  2. Check the high pressure reading is 1.37 -1.57 MPa (14-16 kgf/cm² , 199 - 288 psi).
  3. Check the low pressure reading.
If the low pressure reading is 0 kPa (0 kgf/cm² , 0 psi), replace the expansion valve.
REMOVE REAR DOOR SCUFF PLATE RH
REMOVE REAR FLOOR MAT SUPPORT PLATE
REMOVE QUARTER TRIM PANEL RH
INSPECT THERMISTOR RESISTANCE
1. Disconnect the connector.
2. Measure resistance between terminal 3 and 4.
  Standard resistance: Approx. 1.5 kΩ at 25°C (77°F)
If resistance is not as specified, proceed "INSPECTION" on INSPECTION .

Fig 1: Inspecting Thermistor Resistance
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT MAGNETIC VALVE CONTINUITY
1. Disconnect the connector.
2. Check the continuity exists between terminal 1 and 2.
If resistance is not as specified, proceed "INSPECTION" on INSPECTION .

Fig 2: Inspecting Magnetic Valve Continuity
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK FOR LEAKAGE OF REFRIGERANT
1. Remove the power transistor.
2. Using a gas leak detector, check for leaks of refrigerant.
If there is a leakage, check the evaporator or tightening torque at the joints.

Fig 3: Checking Refrigerant Leakage
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002