Question about 1991 Porsche 944

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I have problems with the ABS system on my 1990 Porsche 944S2. The ABS lamp goes out when thw engine is started, but as soon as the car rolls, the warning light comes on. How do I locate the fault?

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My 1990 944 Turbo has the same symptom. Porsche checked the ABS system using the link to the onboard computer - They identified the right rear sensor - I changed that and it still failed. Turns out it is probably the ABS pump right rear actuator. If I take off fast in a straight line I can prevent the ABS from failing.

Posted on Jan 11, 2010

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Suspect abs fault. to check this use a multi-meter on voltage ac because the sesnors generates alternating current jack the vehicle up locate the sensor wires spin the wheel and see if you get voltage, do this to all four wheels. the one with no voltage is faulty. Or you can can the resistance in the winding. no resistance open circuit. hope this helps

Posted on Aug 19, 2009

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The ABS sensors need replaced. they are located at each wheel

Posted on Jun 28, 2009

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Meaning of ABS light

On vehicles equipped with antilock brakes (ABS), a second warning light is provided to warn if a problem occurs within the ABS system. The ABS lamp comes on when the ignition is turned on for a bulb check, then goes out after the engine starts. If the ABS warning light remains on or comes on while driving, it indicates a fault has occurred in the ABS system.

What happens next depends on the nature of the fault. On most applications, the ABS system disables itself if the ABS warning light comes on and remains on.

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The ABS/PSM warning light on my 2003 Boxster came on, stays on. Specialized Mechanic said it was the ABS Hydraulic control module, extremely expensive and not available in US. Car has only 55K mile. Is it...

Yes you can still drive it. When the ABS system fails, it reverts to the old system. Meaning that when and if you hit the brakes hard enough, the wheels could lock and skid. By releasing them they will roll again. We drove forever with out ABS and most of us are still alive.

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Abs light, tractions off light and check engine light stays on

You may have two problems here, depending on what codes both systems have. The ABS and Trac lights will be turned on whenever the ABS system sees a problem with a wheel speed sensor, a signal reading, or some other component or circuit. Because this type of problem prevents both the ABS and Traction Control system from functioning properly the system will turn on the warning lamp to alert the driver that there is a problem. Usually the Check engine lamps won't come on for an ABS problem but it may if it is a type of problem that affects both systems. I would have a good shop read both the codes in both systems and once they know what the system is seeing they should be able to figure out what has gone wrong. Brakes are one of the most vital safety systems on your vehicle so you should have it checked out as soon as possible!

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ABS light comes ON after start. Last week the ABS

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Why is my check engine soon light on and trac light on?

Check the fuel filter and other components cuz i was rold if you drove your car and kept letting it go under 1/3 of the tank all the time and didnt replace the fuel filter every 15,000 miles you could end up messing up the lines and fuel system and no fuel gets to the lines to make the car start so it will bog down and eventually not start.
Purchase or borrow an OBD2 Code Reader. This is a device that connects under the dash and communicates to your vehicles computer. the code generated by the OBD2 unit can be cross referenced to a data base and the problem identified. ex: P300 misfire of engine detected. You then go in to your dealer or mechanic armed with the info of what is wrong with your car.
These lights are probably all related. When there is a problem in the ABS system, this will disable the TRACTION system, which will inturn illumiinate the Service Vehicle Soon light. A common cause for this is there is a problem in the ABS. A faulty wheel speed senor or the harness to the sensor may be faulty. When the ABS computer (EBCM) sees a problem in the ABS, it can cause all these lights to come on. A scan of the ABS computer would be the first thing needed. Then, diagnosis of the system / circuit that is at fault would be needed.

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1 st gear ok 2nd gear loses power rpm goes high

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Is it a manual or auto? Assuming its a manual, is there an ABS light on? If so or if you hace changed the brake pads recently or even had the tires off or rotated, there could be a problem in the brake pad sensor or abs wheel speed sensor.

Check with Porsche service (your closest dealer) for recalls or TSB (Technical Service Bulletins) related to your concern and check the cayman/boxster owners clubs for similar posts and resolutions.

Hope that helps.

Sep 12, 2009 | 2000 Porsche Boxster

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Engine dies when anti lock light comes on

The ABS light should only come on when there is a problem in the ABS system: a wheel sensor or hydraulic unit problem.

The ABS system shouldn't be interconnected to the engine system so that an ABS fault shuts down the engine. Are you sure as to cause and effect? Could a shorting out of the ignition switch (thereby switching off the engine) be lighting the ABS lamp?

Get a wiring diagram and check for good grounds at the appropriate locations for a 1990 SAAB; also check for possible shorting out of the ignition switch under fault conditions.

The best source of info on this car is the "Bentley Bible" aka the Saab 900 Official Service Manual, costs about $40 from Amazon!

16 valve manual:

8 valve manual :

The ABS system is complex, and best worked on by a trained and trusted professional.

Hope this points you in the right direction!


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Porsche 1990 944S2 Airbag Reset

When you put in airbags, you need to put new airbag sensors as well. If you leave the old sensors in, your airbags MIGHT deploy again. When you change both airbags and both sensors, the system resets itself. I have done this operation before.

Nov 30, 2008 | 1990 Porsche 944

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