JDS & PDU

Jaguar Diagnostic System (JDS) and Portable Diagnostic Unit (PDU)

JDS and PDU are diagnostic devices that interface with the engine management ECM through a data link connector. The use of either unit is essential for effective engine management diagnosis. In particular, oxygen sensor feedback can be accessed only using JDS or PDU.

JDS is a stationary unit while PDU is portable. Both units interrogate the ECM and report flagged DTCs, read ECM inputs and outputs, and aid in engine setup and problem diagnosis. PDU includes a dynamic "datalogger" function that will monitor systems, store data and capture faults while driving. For 1993 MY ON vehicles, both units offer "expanded diagnostics", reporting conditions and number of occurrences for DTCs.