Engine 850: B5254S/2.4/20v: - Code P1651 ETS Light; Problem ISN"T the ETM

CNGBiFuel · Mar 13th, 2018, 14:49

Car is a 1999 V70 Petrol Auto:

The dreaded ETS light came on, and could be cleared by my Scanguage reader. Came straight back on when I hit my cruise-control, but got no cruise. Lumpy idle, low power. Smell of petrol. A few minute would see the code. No CEL.

Fault code P1651 and sometimes P1620 or P0171.

Look-up vai Google and you'll not get agreement. "P1651 and OBD Volvo" and you'll find on most forums the wisdom goes that this is an ETM or cooling issue. It seems later Volvos have the code P1651 allocated to something else. I have a Sacer contactless ETM so thought the ETM was unlikely. I was right...

A smoke test found it. MAP sensor located midpoint on the radiator-cowling had a vacuum tube perished. MAP sensor itself was fine. A foot of tube and some clips sorted it.

Hope that helps somebody...

byootox · Mar 18th, 2018, 12:44

I've seen the ETS light come on when there's issues with the MAF circuit as well.
Did you do your own mod on the throttle body ?

Mar 13th, 2018, 14:49	#1
CNGBiFuel Classic P80 1999 BiFuel Last Online: Mar 6th, 2024 00:34 Join Date: Aug 2012 Location: 48mph Middle Lane M4	Code P1651 ETS Light; Problem ISN"T the ETM Car is a 1999 V70 Petrol Auto: The dreaded ETS light came on, and could be cleared by my Scanguage reader. Came straight back on when I hit my cruise-control, but got no cruise. Lumpy idle, low power. Smell of petrol. A few minute would see the code. No CEL. Fault code P1651 and sometimes P1620 or P0171. Look-up vai Google and you'll not get agreement. "P1651 and OBD Volvo" and you'll find on most forums the wisdom goes that this is an ETM or cooling issue. It seems later Volvos have the code P1651 allocated to something else. I have a Sacer contactless ETM so thought the ETM was unlikely. I was right... A smoke test found it. MAP sensor located midpoint on the radiator-cowling had a vacuum tube perished. MAP sensor itself was fine. A foot of tube and some clips sorted it. Hope that helps somebody... __________________ Bifuel V70 Classic 1999 [The Old Grumpy in the Corner, "When I was a lad... blah, bl*dy blah."] Last edited by CNGBiFuel; Mar 13th, 2018 at 15:00.*

Mar 18th, 2018, 12:44	#2
byootox Premier Member Last Online: Dec 20th, 2021 23:22 Join Date: Oct 2012 Location: Edinburgh	I've seen the ETS light come on when there's issues with the MAF circuit as well. Did you do your own mod on the throttle body ? __________________ 99 V70 T5

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