Western Star Bodybuilder Book: Revision 3.2a 1A WST Gauges & RX Module P. 1A-20 b WST Star Gauge System T.o.C. Beginning in April 2005, the PX and PX-A modules were replaced by air lines that are routed to each individual Star Gauge. These gauges 3” convert the air pressure into an electrical signal. The Star Gauge Data Star databus supplies power, ground, and backlighting information for Star Gauges 87340-4403 these gauges. Beginning with EPA10 vehicles, the engine controller no longer 2” offers a J1587 data bus. The engine, transmission, ABS, and most 87340-4404 of the other optional electronic devices on the vehicle now communicate using J1939 protocol.
Star Gauges are secured in place with a lock ring, which can be removed easily using a removal key The EPA10 RX Module that fits into the lock ring. These tools can be ordered through your WS dealership This new redesigned module, incorporates functions of the earlier 2” Gauge removal tool 87340-4404 RX and PX modules in one unit that also performs a gateway function. 3” Gauge removal tool 87340-4403 The EPA10 RX module performs the following functions: Ÿ Converts sensor and voltage inputs into the J1587 (PI Bus) data. EPA 2005 PX Module 3.2a Ÿ Converts four air pressure inputs into J1587 (PI Bus) data.
Ÿ Gateway Function converts J1939 data that is required for the EPA 2007 RX Module DataStar and the Star Gauges into J1587 protocol (PI Bus) data. 2010 RX Module Note: The J1587 data network is also called the PI bus in some instances. The speedometer uses the J1587 data from the RX module as the source of data for the Star Gauges. The DataStar is also on the J1587 (PI bus) network and uses this data. The RX gateway module is located on the underside of the cab below the steering shaft, near the clutch linkage. ECC 24 to 12 Volt Converter The 24 to 12 volt converter is used on vehicles with 24 volt electrical systems.
It is connected between the speedometer and the dash wiring harness and reduces voltage to 13.5 volts, which is needed by the Star Gauge and DataStar system. 3.2a Models: 4700L/4800/4900/6900 Models: 4700L/4800/4900/6900