» » »

Volvo Q&A

Ask Your Question

1998 Volvo V70 Question: P0410



gregpat, Centreville, VA, February 27, 2011, 11:54

Frequent P0410 OBD2. (PAIR) Air pump run ok if relay manually
opperated.. Have also changed realy.. ECU fail to energise it... (ECU Energises Vacume soleniod okay sas valve opens)

Vacume soleniod operates ok and opens sas valve.

I am completely in the dark now.

Can the O2 sensors contribut to this dilema.?

Any Advice would be greatly Appreciated..


1 Answer
Flag This
  • Answer #1

    March 03, 2011, 15:02

    Hi Greg,
    Can you check the emissions readiness status? Are you positive the ECU is not attempting to activate the pump during warm-up?

    Flag This
  • Reply

    gregpat, March 03, 2011, 17:37

    Hi Bret..
    Status is "Not Ready"
    Voltage on one side of the Pump relay reads 13.4v .. The other side is 2.4 v measured
    to ground... I reckon the ECU should take off the 2.4 volts and supply a
    ground or low impedence connection for the pump relay to energise...

    I am considering using the ground from the SAS vacume soleniod, as this energises
    okay eveyrtime.. (am)\. It is just bugging and frustrating me to no end.. I got two 98 70's
    suffering from this dilema. Hard to ignore CEL.


    Flag This
  • Reply

    Bret Bodas, March 14, 2011, 16:33

    Sorry I took so long to respond to this. Something just doesn't sound right. The way I always addressed these is with the Volvo Diagnostic tool that activates the air pump diagnostic test. Then I would monitor the air pump and the oxygen sensors to determine if the system was functioning properly.
    Without being able to be there and perform tests it's hard to give much more advice. Is there a good Volvo shop that can help with this?

    Flag This
  • Reply

    Visitor, March 14, 2011, 20:04

    Hi Bret...

    Yesiree.. If I had Command Diagnostic it would be a welcome


    Flag This