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Bosch LSU 4 (5 Wire Pump Cell) Digital Design

This document has been updated and can be found here at WBo2.com. Please see WBo2.com for further information.

We are working on a fully digital wideband interface for use with the newer and much more readily available Bosch LSU4 5 wire sensor (note that a number of different LSU 4 sensor may be supported, not just the one illustrated).

The LSU4 sensor is a pump cell sensor like the NTK L1H1. We'll be offering a PCB & full part kit as well as pre-built and tested units that will work with this sensor.

We hope to have a number of new features including :

• Support for the Bosch LSU sensor (and possibly the NTK L1H1 or derivatives)
• Greater accuracy through more precise sensor thermal regulation and sensing.
• Integrated diagnostic capability.
• Logging of RPM and multiple analogue channels with EGT (thermocouple) support.
• On board logging memory.
• AFR Compensation for exhaust back pressure (requires pressure sensor).
• Optional packaging - smaller, more rugged, extruded case.
• Optional integrated display (later offering).

We can give you some preliminary technical details about the new design.: Atmel ATMega8 RISC CPU at 16 Mhz (fast, powerful) Switch mode control of heater sensor (low power and cool operation of unit) Uses bi-directional RS232 to allow software to be field upgraded (reflashed). On-board thermocouple amplifier for multiple EGT (or other) temperature probes. The image shown at left is a cut-away of an actual LSU4 sensor showing the pump cell. The ceramic "rectangle" is just over 4 mm across (ie. it's small).

Alternate LSU Part # to 0 258 006 066

A number of vehicle manufacturers currently use a Bosch LSU 4 wideband sensor on their production vehicles. Feel free to contact us and add to the following list. Were there are multiple part number, like 065/066 they refer to the same sensor with longer or shorter leads.

Bosch Part Number	Vehicle Part number extra info
0 258 006 065/066	Standard Bosch 2.0 LSU 4 standard sensor - sold by Tech Edge
0 258 007 044	Porsche Carrera 911 GT3 part # 996-606-168-01
0 258 007 057/058	1.8T and 2.8L VR6 VW Golf, Jetta and Turbo Beetle, VW part # 021-906-262-B
0 258 007 085/086	2.0 L VW
0 258 007 090/091	unknown VW
B 258 400 085/1	Audi part # 023 906 262 A - from a test car
0 258 xxx xxx	Cadillac no information
0 258 xxx xxx	Volvo no information

Note that not all these LSU sensors have the same connector.