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Refrigerant Pressure Sensor / Switch

Sensors and Switches › Sensors and Switches - HVAC
Unified entry — merged from multiple cross-listed pages in the original manual.

Labor

Replace — Pressure Transducer0.4 hr
Warranty 0.0 hrSkill B
Refrigerant Pressure Sensor1.4 hr
Warranty 0.0 hrSkill B
Procedures
A/C Pressure Transducer - Removal3 steps
ℹ NOTE
It is not necessary to discharge the refrigerant system to replace the A/C pressure transducer.
ℹ NOTE
LHD model shown. RHD model similar.
Fig. 1
Fig. 1
  1. Disconnect and isolate the negative battery cable.
  2. Disconnect the wire harness connector (1) from the A/C pressure transducer (2) located on the A/C liquid line (3) near the dash panel (4) in the engine compartment.
  3. Remove the A/C pressure transducer from the A/C liquid line and remove and discard the O-ring seal.
A/C Pressure Transducer - Installation4 steps
ℹ NOTE
Use only the specified O-ring as it is made of special material for R-134a. Use only refrigerant oil of the type required for the A/C compressor.
ℹ NOTE
LHD model shown. RHD model similar.
Fig. 1
Fig. 1
  1. Lubricate a new rubber O-ring seal with clean refrigerant oil and install it onto the A/C pressure transducer fitting.
  2. Install the A/C pressure transducer (2) onto the A/C liquid line (3) near the dash panel (4). Hand-tightened the transducer securely.
  3. Connect the wire harness connector (1) to the A/C pressure transducer.
  4. Reconnect the negative battery cable.
Refrigerant Pressure Sensor / Switch: Testing and Inspectionreference
Fig. 1
Fig. 1
A/C PRESSURE TRANSDUCER Before testing the A/C pressure transducer, be certain that the transducer wire harness connection is clean of corrosion and properly connected. For the A/C to operate, an A/C pressure transducer voltage reading between 0.451 and 4.519 volts is required. Voltages outside this range indicate a low or high refrigerant system pressure condition to the powertrain control module (PCM). The PCM is programmed to respond to a low or high refrigerant system pressure by suppressing operation of the A/C compressor. Refer to the A/C Pressure Transducer Voltage chart for the possible conditions indicated by the transducer voltage reading. The A/C pressure transducer is tested using a scan tool Testing and Inspection. A/C PRESSURE TRANSDUCER VOLTAGE
A/C Pressure Transducer - Descriptionreference
Fig. 1
Fig. 1
DESCRIPTION The A/C pressure transducer (1) sends a signal to the powertrain control module (PCM) which controls both A/C compressor clutch engagement/disengagement and electric cooling fan operation. The A/C pressure transducer is mounted on a fitting located on the A/C liquid line near the dash panel. The PCM will disengage the A/C compressor clutch when high side pressure rises above 2971 kPa (431 psi) or fall below 206 kPa (30 psi). The fitting for the A/C pressure transducer on the A/C liquid line is equipped with an O-ring seal and contains a Schrader-type valve to allow the transducer to be serviced without discharging the refrigerant system.