1999 S70 Cruise Control Surging, solved with new axle and ABS ring Topic is solved

Reinie · Post by **Reinie** » 12 Jun 2018, 21:42

My 1999 S70 non-turbo, base, (240K miles) has an issue with the cruise control. It will set and hold speed, but it pumps the gas pedal really bad. I have a rebuilt Xemodex ETM with about 140K miles on it. When the original ETM failed, I had no cruise at all and dash lights on. Could the ETM be going bad again? I checked the vacuum line elbow on the end of fuel rail and it was good.

Post by **Ozark Lee** » 12 Jun 2018, 22:32

On a '99 the gas pedal shouldn't move at all when the cruise is engaged. The pedal has no physical mechanical connection with the throttle body, it is totally fly by wire. The pedal itself has only wires from a position sensor and it typically stays all the way out since the signal is a one way flow from the pedal to the ETM. There is no return signal that would adjust the pedal position electronically.

Perhaps I am misreading the question.

...Lee

Reinie · Post by **Reinie** » 13 Jun 2018, 06:42

Your right, the pedal does not move, but the cruise constantly accelerates / decelerates back and forth to maintain speed. It’s super annoying.

Pater · Post by **Pater** » 13 Jun 2018, 08:20

Is this problem similar as in my topic?
Is this light surging or heavily (speed increase/decrease)

viewtopic.php?f=1&t=85562&p=474073

Reinie · Post by **Reinie** » 13 Jun 2018, 08:34

Yes, I noticed your post. I have the same issue. Let me know if you solve it.

Reinie · Post by **Reinie** » 04 Aug 2018, 14:08

SOLVED: This was caused by a broken reluctor ring on the front axle. Parts were covered under warranty from previous repair (Oreilly Auto Parts). $130 labor to replace the axle. This also solved my issue with abs brake deployment on dry pavement.