Thread: Interesting M&S fault - Thoughts?

Over the last week, the M&S lights have been appearing. Whilst this is not that uncommon as ive only recently diverted the a/c drains away from the xyz switch and DC joint, it used to only happen when i was stationary, ie moving from park to drive.

Now it wants to happen when im in the Burnley tunnel, or turning onto the Bolte bridge in heavy traffic !!! It seems to happen when you are coasting, ie no foot on the accelerator for a while then when you plant the foot to take off again.....nothing.....but flashing M+S lights plus the orange engine light. I quickly turn put the auto in Neutral, switch the engine off then back on again while still coasting, and off i go again. Interstingly, on my way back, I switched on my lights and the M+S lights didnt come back on..... coincidense ...... probably?

This morning over a 20 min drive, it happened 5 times which is starting to get rather annoying as well as dangerous.

Before I go pulling apart the XYZ switch, has anyone experienced this exact thing before. Ive read a heap of posts already but nothing specifically like this.

I have two brand new yellowtop batteries, but ill go out and measure them shortly just to rule them out - as well as my altenator.

Thoughts?

Originally Posted by Toppa

Im not sure if i was clear earlier, but when the m&s were on, it didn't go into limp mode, it lost all power, no revs at all regardless of throttle position.

Exactly what mine did, cruising along, idling down the street, pressed accellerator - Nothing
No other symptoms, just throttled off, and when I went to move on, no throttle
Car was still idling fine, M&S flashing, turned off - restarted fine and been fine since

This was a day after I was able to get my standard Map back on my ECU, but that is another story

Checked out the live data for a while afterwards and throttle readings were fine

From what I understand, if the volts of tracks 1 & 2 dont add up to the supply voltage it throws a code?