1999 Volvo S70



April, 30, 2009 AT 8:08 AM

Electrical problem
1999 Volvo S70 6 cyl Front Wheel Drive Automatic 222000 miles

My Volvo is really a 5 cyclinder.

A couple of questions.

1. When the outside temperature is above 80 degrees and after I've operated the car about 45 minutes, the ABS light will sometimes come on and cruise control will kick off. If I try to reset the cruise control, it will not ingage. The ABS is on from this point on. Only after stopping the car and it being off for at 30 minutes wiill I be able to use cruise control. When I get back in and start the car after the time off, the ABS light is still on. It goes off the first time I use the brakes and I'm ethen able to use cruise control until the sequence occurs all over again with the right conditions?

2. Where is the intake value (low pressure side) of the air conditioning system located?


3 Answers



May, 3, 2009 AT 7:41 PM

Can you have the ABS and ECM module scanned for trouble codes?



May, 3, 2009 AT 9:22 PM

Thanks for your reply.

I imagine I could get a scan. However, I'm fortunate to have ready access to a PhD EE with over 20 years experience in the automotive industry. Posed the facts to him and he thought it was either a faulty MAP sensor or manifold pressure. Since it only occurred at warm ambient temps, he thought it is the sensor.

Low pressure detection kicks off the ABS system and cruise disables for safety. Sound right?



May, 4, 2009 AT 12:35 AM

If there is a problem with the MAP sensor then I believe you should already have seen the CHECK ENGINE light come on posting some sorte of code? So if you were to drive in the evening when it is cooler you have no problems at all? The ABS module is located inside the engine compartment and they seem to fail a lot of the time and when the ABS light comes on as a precaution it will disable your cruise control. I would really recommend having the ABS module scanned and look for trouble codes related to the vehicle speed sensors.

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