Secondary Air System Pump

[dstrip72]

Background:

2001 986 S

148,000 miles

CEL 0410 and 1411

I know what they are. I've looked at the trouble shooting. Don't have the Durametrics or Porsche Diagnostics -- just a Actron 9575 scanner.

The secondary air pump does NOT come on during a cold engine start.

A fan noise DOES come on after extended driving (i.e. 45 minutes highway driving and then stopping at a red light) for approx 20-30 seconds and then cycles off. Coolant temps are only in the mid 180's when this happens so I wouldn't think it would be radiator fan noise but I guess it could be.

Would the SAI pump cycle thru in that situation? If it would that means it works but not at startup = relay???

As a follow up question - does anyone know exactly what constitutes a driving cycle and how many you need before the SAI shows ready on the monitor?

-dtrip

Edited June 20, 2012 by dstrip72

[Loren]

Check the fuse and relay for the secondary air pump that is located on the relay support panel 2 (inside the rear trunk under the carpet).

I suspect the fuse is blown (40A).

[dstrip72]

Looked at that last night but the light was dim. I was hoping that would be a quick fix. Next would be the relay (position 10 if I'm not mistaken).

[Loren]

Take the fuse out and check it with an ohm meter - too be sure.

[bar10dah]

The fan noise you heard was probably the engine compartment fan. It's in the same general vicinity as the SAI. To my understanding from observing operation, and reading up in the Bentley repair manual, the SAI only comes on during a cold start.

[kbrandsma]

Take the fuse out and check it with an ohm meter - too be sure.

Yes, check it to be sure.