Help with error codes

[Dojo2000]

Got my car scanned at Autozone, here's what I got:

P0102
MAF sensor circuit, low input

P1406
EGR valve system performance (guess it needs to be cleaned)

P1561
PSP switch input faliure (what the hell is a PSP switch!?! No one there knew!)

P1562
IAC monitor diaabled because "PSP switch faliure" on

Can anybody help me with this? Nobody had a clue what a PSP switch was, neither do I. Car seems to be running fine, the SES light just comes on from time to time. First I thought it was my manual fan switch, but these are the only codes I got. I did just finish a 800 mi drive back down from Michigan a couple days ago, the SES light came on about halfway down.

[Dojo2000]

For a little while there the SES light went off, but now its back on.

[strange_trp]

power steering pressure switch (no offense to anyone here that works at autozone, but this is one of the problems i have with them pulling codes... they should have known this). if you are not having any power steering problems, this switch and its circuit to/from pcm may be faulty.

the purpose of the switch is to increase rpm's when it senses power steering pump is under a heavy load, like when drivng in parking lots at low speeds. both the psp codes are due to (probably) a fault in the PSP sensor/switch circuit to/from pcm.

i think the maf and egr codes may also be related. maybe correct diagnosis of either the maf circuit and sensor and the egr circuit and actuator/sensor will take care of both these first codes you listed.

actually, it is possible (i'm not sure how probable) that a bad PSP circuit could be causing all 4 codes.

[ June 30, 2002: Message edited by: strange_trp ]</p>

[Dojo2000]

Thanks strange