Replacing the Pressure Transducer

This component controls the AIF filter pump by sensing the pressure in the expansion chamber.

Voltage range is 0.5 to 4.5 VDC, corresponding to a pressure range of 0 to 30 PSIG.

A measured pressure below -1.5 PSI or above 32 PSI may indicate a failed transducer, it has become disconnected, or a clogged expansion chamber.

Viewing the pressure

1. Press the left and right arrow buttons at the same time and “*HP* *INFO*” displays, followed by “1. ELOG”.

2. Press the right arrow button until “14. AIF” displays.

3. Press the Down arrow button until “PRESSURE SENSOR” shows in the left display.

4. Press X button to show pressure in PSI.

An over-pressure issue can also indicate a return valve failing to open, instead of a faulty transducer or a clogged chamber. Extra long fill times or oil bubbling at end of an AIF cycle may be signs of a clogged expansion chamber or faulty transducer.

In case of a clogged expansion chamber (2), remove the cleanout plugs (1) at each end of the chamber to clean the obstructions inside the chamber.

To avoid electrical shock or property damage, move the power switch to OFF and disconnect power.

Replacing

1. Remove the left side panel.

   

2. Pull-out on the clip, while pushing up on the wire harness connector, at the top of the transducer, to remove wires.

   

3. Using a 1-1/16 inch wrench, remove the transducer from the expansion chamber.

4. Using pipe thread sealant, install new transducer in reverse order and restore power to the unit.