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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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Cruise Control FaultViews : 520 Replies : 7Users Viewing This Thread : |
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Mar 21st, 2019, 14:13 | #1 |
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Cruise Control Fault
Hi, my cruise doesn't work (2002 V70 2.4 n/a auto)
Problem: - Cruise button intermittently doesn't not activate "cruise" light or cruise control in general driving. - it often works at the start of the journey and then wont work later on. What I have tried: - Steering wheel controls are working as radio controls work. - Have tried pulling brake pedal up as well as down and no effect. - Have checked brake pedal sensor and it looks undamaged and the brake light works correctly - Checked VIDA and there are no relevant errors May be relevant: Cruise control has always worked previously with my car and it stopped working after fixing a vacuum leak, see this thread for more info about that: https://www.volvoforums.org.uk/showt...14#post2504814
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2002 Volvo V70 2.4 n/a auto |
Mar 21st, 2019, 14:47 | #2 |
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Check the button and brake pedal switches in VIDA
Do live monitoring and then press and release button a number of times, makes sure the button press is always registered Likewise for brake pedal
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Mar 22nd, 2019, 15:09 | #3 | |
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Quote:
The brake pedal position reads 0.39% with the engine running ( foot off the pedal ) and responds to brake pedal pressure going up to 50% with hard pressure on the brake pedal. Does this mean the brake pedal sensor needs replacing or just adjustment? May also be worth adding that the brake pedal occasionally makes a hissing noise when releasing the pedal.
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2002 Volvo V70 2.4 n/a auto |
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Mar 22nd, 2019, 15:12 | #4 |
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Screen shot attached of engine running and foot off brake pedal.
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2002 Volvo V70 2.4 n/a auto |
Mar 26th, 2019, 12:56 | #5 |
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Cruise control has started working again, no idea why, but I'll take it!
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2002 Volvo V70 2.4 n/a auto Last edited by BlueRubber; Mar 26th, 2019 at 12:59. Reason: typo |
Mar 27th, 2019, 12:23 | #6 |
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Mine went intermittent and it was the brake position switch that was failing.
It was on and off for a bit then failed for good. Over £100 for the part. Typical part that wears away with use, like the pots on the throttle body. The hissing is the servo, I think that is normal.
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Mar 28th, 2019, 22:08 | #7 |
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I don't know if this is applicable to Auto boxes but in the manual car there is a clutch position sensor which is a simple potentiometer, which gives incorrect readings causing the cruise control to fail.
A simple solution is to solder a resistor in parallel in the sensor to bring it back into range. I have done this twice on two vehicles and it lasts for about 4/5 years before it fails again, and in my case I bought a new sensor. Don't know if the brake pedal sensor is the same potentiometer variant - worth a check for a 10p fix - although Maplins has now gone bust. Cheers Bob |
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Mar 29th, 2019, 10:43 | #8 |
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Thanks for the input.
As far as I know the brake pedal has two sensors. One is the brake light switch which seems to work fine. The other for the brake pedal position sensor, I think this is what might be causing the problem, so if the cruise control plays up again I will try changing this sensor.
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2002 Volvo V70 2.4 n/a auto |
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