Question about Jaguar XJS

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Hi i have a problem with a '94' model Jaguar XJS 4.0 switchable sport gearbox. When the car is started the gearbox fault light has started staying on, when this happens the gear change goes from being really smooth to very harsh, but still engages all gears. This has become more and more frequent. We have just changed the gearbox and the ECU and the problem is exactly the same, can anyone help please?

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  • cbanthon Sep 03, 2008

    I have a Jaguar S-type and had recent repair to replace cooling system overflow box.  Still gets hot after you turn off the air.  Now I have a gearbox fault light on, wonder if this is related to cooling system .  I notice that the outside temp gage goes up after the light comes on for the gearbox.??


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Sounds more like TPS (Throttle position switch) or wiring fault from it. Gearbox ecu is not getting accurate data from throttle. Is the engine starting ok and steady rev build?

Posted on Jul 24, 2009

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Dont know for sure on jags but normally id be checking out the clutch

Posted on Aug 26, 2008

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