Clutch Position Sensor - sensor range? (VIDA)

[deeess]

Hi all,

Diagnosing an intermittent no-crank (cold outside temperatures only) on a 2001 V70 manual transmission, about 220,000 km.

Hooked up VIDA and have a clutch position sensor range between ~2% and 86%. It still starter with clutch all the way in (CPS showing 86%).

Does anyone know if this range reduction from closer to 100% is normal? Or could sensor range reduction be causing no start? Any idea what the minimum CPS % it will start at is? Could not find these details in VIDA.

Thank you!

[abscate]

I’ve got the resistance logged as a function of position, try searching under the part number here and in the P80 forum, too.

[93SCMax]

I had the clutch position sensor failure code last year. After much troubleshooting, it ended up being the ETM. Has your ETM ever been replaced?

If your issue is the clutch position sensor, it's not hard to replace. You can even clean the sensor and reinstall.

[deeess]

Appreciated the details and finally tracked this issue down conclusively.

I bypassed the CEM output (clutch switch and immobilizer) as temporary test and the problem went away. I replaced the clutch switch with a new part from Volvo and problem is solved.

The old clutch position switch measured 283 ohm to 2,258 ohm. The new one ranged from 210 ohm to 2,005 ohm. Oh sensitive Volvo electronics.

With the old switch VIDA was showing about 85% clutch pedal position when fully depressed (didn't record exact), this changed to 95% with the new switch. I'm guessing the threshold value in the CEM software is around 85%.

Also to note with the new switch, VIDA shows clutch pedal position as 8.24% when clutch pedal fully out.

[abscate]

I’ve always meant to map the resistance to the percent clutch pedal position number, thanks!

1999 on, the clutch switch has an additional function of triggering the grounding of the starter relay, thtough the ECM, on me7 cars

[deeess]

Also, I believe the old sensor showed ~4% fully out, but again this is from memory.