Erroneous Fuel System Failure Symbol Displayed (from MoDS)

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TECHNICAL SERVICE BULLETIN

ELECTRICAL - FUEL SYSTEM FAILURE SYMBOL

Model            Jaguar XJ6 3.6
Section          86 - Electrical
Bulletin No.     7
Date             June, 1987

   SERVICE INFORMATION

   The vehicle condition monitor (VCM) on a number of early production
XJ6 3.6 vehicles has displayed the "fuelling failure" symbol when no
such failure has occurred. In some cases this has been followed by
fuel failure "1" on the text display. Although it is believed that
all USA production cars are modified to prevent this the possibility
exists you may encounter this fault.
   To rectify this situation a vehicle software change is currently
in progress. Upon completion of the software change, a vehicle intro-
duction number signaling the software change will be advised in a
Service Bulletin.
  As a temporary measure to disable the fuel failure warning function
on vehicles which exhibit this problem, the following procedure should
be carried out:

   1. Disconnect battery.

   CAUTION: Ensure that the ignition is switched "OFF" before battery
             disconnection.

   2. Remove LH underscuttle casing.
   3. Locate the 24-way PMHD yellow connector block LB53 and remove
      the blue/green (U/G) cable socket "10" from the bulkhead harness
      side connector block.

   NOTE: Ensure that the socket and cable are removed intact, to
         enable reconnection should the instrument pack "fuelling
         failure: diagnostics be required.

   4. Fold the display cable back and secure it to the harness using
      suitable insulation tape.
   5. Re-fit the underscuttle casing, re-connect the battery and reset
      clock.

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