ECM-434C Fuel tank system, leakage

[Metallo]

Hi guys,

I just took the diagnostic below from my son's car:



At this time, I am only interested in the ECM-434C error, the BCM one is old and I know where it is coming from, but the ECM-614B is new, like the ECM-434C and I am not sure if they are in some sort related.

Volvo changed one month ago the Fuel Pump and they also replaced the O-Ring of the Sender Fuel Pump.

Now, I am not sure where to start with the ECM-434C error, the car sounds and runs smoothly.

As always, your advice is precious.

Thank you!
Alex

[RickHaleParker]

ECM-434C could be a loose fuel cap or a small leak in the EVAP system. Check fuel cap, if that is not the problem then do a smoke test to find the leak.

ECM-614B start with Oil quality.

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ECM-434C Fuel tank system, leakage. Minor leak

Condition
If no fault has been detected in the leak diagnostic unit, the engine control module (ECM) carries out a leak diagnostic of the fuel tank system. The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects a leak which is 0.5-1.0 mm.
For further information about leak diagnostics, see VIDA Design and Function.

Substitute value
None.

Possible source

• A leak that is 0.5-1.0 mm or smaller in the fuel tank, fuel filler pipe, fuel tank filler cap, EVAP canister, evaporative emission system (EVAP) valve, or in the hoses between these components.

Fault symptoms
Malfunction indicator lamp (MIL) lit.

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ECM-614B Camshaft control, exhaust.

R2102435 Condition
The engine control module (ECM) checks that the position of the exhaust camshaft (actual value) corresponds to the requested position (desired value).
The diagnostic trouble code (DTC) is stored if the requested position is not reached.
The diagnostic trouble code (DTC) is diagnosed by the engine control module (ECM) when the engine is running and the camshaft control is active.

Substitute value
None.

Possible source

• Low oil pressure
  Poor oil quality
  Damaged reset valve
  Mechanical fault in the variable valve timing (VVT) unit.

Fault symptoms
Malfunction indicator lamp (MIL) lit.

[Metallo]

ECM-434C could be a loose fuel cap or a small leak in the EVAP system. Check fuel cap, if that is not the problem then do a smoke test to find the leak.

ECM-614B start with Oil quality.

I will try the above steps first, but how about the smoke test? Is this something that can be done at home or at the dealer?

Alex

[RickHaleParker]

Smoke test is where smoke or vapor is injected in the lines and you look for where it comes out.

Most shops have smoke machines.
You can use smoke in a can at home, that is pricey in my opinion.
Google "DIY EVAP smoke machine" there are lots of ways to make a smoke machine, cheap.
If you got the lungs for it, you could puff on a cigar and blow the smoke in the line.

[Tonytime]

Was the culprit to the leak ever found?

I am trying to solve recurring evap leak codes on my 2007 XC70. My local shop tried a smoke test and found nothing, partly because he said they don’t have the tools for a Volvo to be able to open/close the valves in the evap system and test them. I’ve replaced fuel pressure sensor, and an evap canister purge valve to no avail.

Is there not a single common culprit in these evap leak scenarios? Seems like everyone says “do a smoke test” - now I’ve done one, and I’m still lost.
Do I need to dish out more cash and go to a euro shop/Volvo dealership for a “serious” smoke test?
Or, alternatively, get under the car and start taking everything off and inspecting it until I see the little hole?