2007 xc70 code 443 already replace purge control valve

volvomadness · Post by **volvomadness** » 12 Mar 2019, 14:04

Getting a code 443 says purge control valve malfunction. I put in a brand new one from fcp still getting code.

Any thoughts?
Madness

Post by **RickHaleParker** » 12 Mar 2019, 16:49

P0443 = ECM-421B Canister purge (CP) valve. Signal missing

Diagnostic trouble code (DTC) information ECM-421B

Condition
The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that there is no signal from the evaporative emission system (EVAP) valve.
The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute value
twin heated oxygen sensor (HO2S) control disabled.

Possible source

1. Damaged evaporative emission system (EVAP) valve
2. Open-circuit in the signal cable
3. Contact resistance in the terminals
4. Open-circuit in the power cable.

Fault symptoms
Malfunction indicator lamp (MIL) lit.

volvomadness · Post by **volvomadness** » 12 Mar 2019, 17:08

Thank you for the reply. I put a brand new purge control valve in the car and still getting the code.l

Post by **RickHaleParker** » 12 Mar 2019, 17:19

volvomadness wrote: 12 Mar 2019, 17:08 Thank you for the reply. I put a brand new purge control valve in the car and still getting the code.l

Check the wiring, shorts/opens? Electrical Connector clean? Is it getting power? Ground good?

volvomadness · Post by **volvomadness** » 13 Mar 2019, 19:05

To test whether its getting power to the purge valve can I hook up a 12volt tester to the connection when the car is warm?

Post by **abscate** » 13 Mar 2019, 20:22

Disconnect the purge valve electrical and look for 12 V on one pin to ground with ignition on.

volvomadness · Post by **volvomadness** » 15 Mar 2019, 17:49

I am almost sure there is a short somewhere. The connection is under the intake does anyone know if I trace the wires are they accessible how are they snaked?

Thanks Madness

Post by **abscate** » 16 Mar 2019, 08:18

You will spend hours fudging electrical stuff.

Look for 12 V at the purge valve , key on. The wires on Volvo disappear quick into well designed and insulated looms which rarely give trouble unless someone has messed with it.

Odds are 999/1000 it’s a simple missing 12 from a fuse , relay, or connector

volvomadness · Post by **volvomadness** » 17 Mar 2019, 07:36

Looked at all four fuse areas not one specifies a fuse, relay for purge valve solenoid or am I missing something.

Thanks Madness

Post by **xHeart** » 17 Mar 2019, 08:57

Here is a view of pertinent components. Item #6 is the SHUT OFF VALVE near canister -- rarely fails.