Question about 1999 Land Rover Discovery

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Landrover td5 abs light and traction control light illuminating periodically it seems to have lost power and is making a whirring noise

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Sounds like a faulty Diff Lock switch to me.
Most of the D2 models till late 03 model year use a version of firmware on the SLABS ECU that when diff-lock is detected puts the ABS and Traction Control systems into a lower response mode. Late model vehicles came with factory fit diff-lock linkages as a option, and the firmware was revised to allow this to operate in conjunction with the traction control.
Therefore ABS and TC illuminating (but with no HDC) means your TC/ABS is in the lower performing mode, and your diff-lock may be in, but more likely the £12 switch has broken, and needs replacing. It's a bugger of a job, and can be done from underneath the vehicle (did mine this way) the switch is p/no PRC2911, and just unscrews. It's located just behind the diff-lock stud above where the front prop fits.
Your options are thus:
1) Remove the front prop. Work blind and try and change it by feel alone. Helps if you can clean the area off before too, don't want any rubbish falling in the box! Unplug & Undo the switch, IIRC it's a 12mm head, and a stubby spanner is the tool for the job. Remove, swap the lower nut from the old switch to the new one (important for the length) and put back in. Don't do up too tight, or it may shear off (as my friend did 2 days after I did mine! He kept tightening it...) Pop the connections on and the front prop and the fault should go away. You could also just disconnect the switch if you want. IIRC open circuit is no-diff lock anyway, but if that's not correct then make up a link with some spade connectors and link it out then.
2) Remove the centre console, drill the rivets and attack from above. Same tools needed, just you can see what you're doing.
I favoured Option 1. YMMV!

Your whirring noise and loss of power may indicate the diff-lock is engaging occasionally and may indicate damage to the transfer box.

Posted on Feb 25, 2010

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Abs light came on


What it looks like: The traction control warning light typically takes the form of the acronym "TC." Sometimes this light is a small illuminated picture of a car losing control What it looks like: The traction control warning light typically takes the form of the acronym "TC." Sometimes this light is a small illuminated picture of a car losing control. How this system works: Traction control uses wheel speed sensors to detect when one or more of the car's wheels lose grip and traction. When the system registers a loss of traction in one or more of the wheels, a computer will limit power to the wheels that are still in solid contact with the road to prevent a skid. Common reasons for this to happen:
  • ABS is malfunctioning: Traction control and ABS (anti-lock braking system) often share the same control module and internal self-diagnostics system. As a result, sometimes an issue in the ABS can trigger the traction control light. If this is the case, then both the ABS and Traction Control lights will be on.
  • Broken wheel speed sensors: Wheel speed sensors are usually in the wheel bearing assembly, and determine the rate at which each wheel is moving. The sensors relay that information to the traction control module, which determines whether or not power needs to be shifted. Wheel speed sensors can get dirty or damaged and stop working, which prohibits the traction control module from knowing when to enable the system.Traction control module is faulty: The traction control module - which, again, is often shared with the ABS - can malfunction and break altogether, causing the system to stop working. What to expect: A top-rated mobile mechanic will come to your home or office to determine the source and cause of the traction control issue, and will then provide a detailed inspection report that includes the scope and cost of the necessary repairs. How important is this service? It's important to have the traction control issue investigated as soon as possible, as adverse driving conditions can arise at any time. While your car is unlikely to incur further damage from a faulty traction control system, it won't be safe to drive in rain, snow, sleet, or other inclement weather, or even possibly through pools of water on the road. Furthermore, the issue that is causing the traction control light to illuminate could also be impacting the ABS.

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Not sure what year this is but it may be the audio box that make the noise or the switch in the cylinder lock itself,
When the key is removed it release a lever that makes a connection and if lights are on it sounds the box but if this lever is worn then no noise, try to wiggle key and see is it works,

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2003 cts, i took it for a safety and they did not disable traction control, when putting the vehicle on the hoist, now the traction control and abs lights come on randomly, but turn off when i restart the...


well while putting the car on the lift, traction control does not need to be disabled, and will not cause the abs/traction light to illuminate, these cars are known to have terrible wheel speed sensors that are brittle and tend to brake or malfunction for no apperent reason, and the wheel speed sensors are what control your abs and traction conrol units and they are normally what make the light come on on your dash, the warranty on the sensors was prolonged for that reason, so depending on the mileage of your car they might be covered, hope this helps

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I have a 2003 LS Sport Impala I have relpaced the front wheel bearings twice and have lost the humming noise but still have an issue with the ABS and traction control warning lights being on. I had it...


WHEN YOU PRESS THE BRAKE PEDAL DOES THE PEDAL SEEM TO JUMP? IF SO THE MODULE HAS SEEN A WHEEL SPEED SENSOR MPH DROP SIGNALING A BRAKE LOCK UP . OR LOSS OF WHEEL SPEED , IF THATS THE CASE THE MOST COMMON PROBLEM IS A BROKEN WIRE IN THE VEHICLE HARNESS NEAR THE WHEEL SPEED SENSOR CONNECTOR USUALLY WHERE THE HARNESS MAKES A U TURN UPWARDS .

IS THE ABS LIGHT ON ALL THE TIME ORDOES IT RESET WITH A KEY CYCLE?

FIRST OF ALL THE TRACTION CONTROLL AND THE ABS SYSTEM ARE BASICALLY THE SAME SYSTEM.

THERE SHOULD BE SERVICE CODES FOR THE MALFUNCTIONS , FIRST THING IS TO RETRIEVE ALL ABS CODES THEN MONITOR WHEEL SPEED SENSOR INPUTS WHILE DRIVING

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I have Landrover Discovery TD5 and the ABS and TC light are on. Periodically the Diff lock light shows. It has been plugged into diagnostics at local garage, but NO FAULT WITH ABS PICK UPS!! Advice...


Sounds like a faulty Diff Lock switch to me.
Most of the D2 models till late 03 model year use a version of firmware on the SLABS ECU that when diff-lock is detected puts the ABS and Traction Control systems into a lower response mode. Late model vehicles came with factory fit diff-lock linkages as a option, and the firmware was revised to allow this to operate in conjunction with the traction control.
Therefore ABS and TC illuminating (but with no HDC) means your TC/ABS is in the lower performing mode, and your diff-lock may be in, but more likely the £12 switch has broken, and needs replacing. It's a bugger of a job, and can be done from underneath the vehicle (did mine this way) the switch is p/no PRC2911, and just unscrews. It's located just behind the diff-lock stud above where the front prop fits.
Your options are thus:
1) Remove the front prop. Work blind and try and change it by feel alone. Helps if you can clean the area off before too, don't want any rubbish falling in the box! Unplug & Undo the switch, IIRC it's a 12mm head, and a stubby spanner is the tool for the job. Remove, swap the lower nut from the old switch to the new one (important for the length) and put back in. Don't do up too tight, or it may shear off (as my friend did 2 days after I did mine! He kept tightening it...) Pop the connections on and the front prop and the fault should go away. You could also just disconnect the switch if you want. IIRC open circuit is no-diff lock anyway, but if that's not correct then make up a link with some spade connectors and link it out then.
2) Remove the centre console, drill the rivets and attack from above. Same tools needed, just you can see what you're doing.
I favoured Option 1. YMMV!

Feb 10, 2010 | 1999 Land Rover Discovery

1 Answer

2000 landrover discovery td5 GS abs tc and hill decent lights on the dash. any help apreciated!!


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