MIL ON - DTC P0300 Stored in Memory

18-49
Amended
1/98

DATE 11/95

MODEL
4.0L Normally Aspirated 1996 MY

XJS VIN
222632 - 224124

MIL Illumination - DTC P0300- Service Action S659

Remove and destroy Bulletin 18-49, dated 11/95.
Replace with this Bulletin.
Revised text is marked with a bar and asterisks.

ISSUE:

Some 1996 MY vehicles within the above VIN range may experience illumination of the Malfunction Indicator Lamp (MIL) caused by DTC P0300 being set. The DTC is set due to close software tolerances in the ECM rather than a mechanical problem with the engine.

This condition can be rectified by replacing one or both of the Programmable Read Only Memories (PROMs), depending on the VIN, with new PROM(s) from the appropriate modification kit.

ACTION:

*Refer to Technical Bulletin 18-52, dated 4/97. The software revisions for Service Action S659 to solve the above complaint were incorporated in the PROMs designed for Service Action S676.*