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Evaporative canister purge control valve circuit fault
In 1990-1994 XJ6 the VCM Code 44 is the code for the O2 sensor, either rich or lean exhaust has been detected and is causing the code to trigger. It could indicate a bad O2 sensor.
Code fuel 1 would indicate Oxygen sensor. A good information source is the Haynes Manual Jaguar XJ6 1988-94. Good luck.
I own a 91' XJ6 also and i believe when that code comes up it is as simple as your gas cap not being on all the way
a problem with the throttle potentiometer
what means fail 44 of vcm of jaguar
Idle speed control valve coil 1 fault. Off voltage not less than 0.85 volts or on voltage not exceeding 12.25 volts.
Fuel Fail 37 is either a fault with the EGR Valve or its Solenoid
fuel 44 is heated oxygen sencer bank A other term lambda senser the jag has two.
it means Pad NOT Pao YOUR BRAKE PADS ARE LOW.
JAGUAR vehicles obd1 code retrieval For Jaguar vehicles with obd1 codes (made before 1995 or 1993), testing the check engine lights in your dash to get the code is simple. All you do is locate the Vehicle Condition Monitor (VCM) button in the dash panel sitting below the tachometer and speedometer. The procedure begins by turning the key off and waiting for 5 seconds then turning the ignition key to position 2 without starting the engine. When you press the VCM button, codes will start to display in your dash panel. Clearing the codes can be done by turning the key off and removing the battery negative terminal for 30 seconds and reconnect.http://www.extreme-check-engine-light-codes.com/Jaguar%20OBD1%20Decoder.htm
description = throttle pot or associated wiring. function = looks for throttle pot resistance out of range.