SAIS issues (naturally)

I have a 2007 Toyota tundra 4.7, a while back I had some issues with the SAIS and decided to get a Hewitt tech gen2 bypass kit. The kit worked for a few days but then I started getting a p1614 p1613 sometimes but would clear and stay away for a while but recently I have started getting a p2442 and limp mode, I thought the air valve was physically crippled and replaced it but I am still getting the codes and now getting P2438 and one other that only showed up once and I can’t remember what it is. I have poured money into this bs and can’t figure it out, and help would be tremendously appreciated

 

Not an expert at all with this, but I installed the kit the first time and got 1613/1614 right away. I was using two PSO units too. I misread the directions and didn’t install the harness to the two OEM plugs that go to the valves (I thought since I was using the PSOs it didn’t matter). Thus my guess is it’s something to do with those two physical valves or harnesses to them, possibly check the kit connections there? I thought it could be easy to switch the harnesses connections between the two valves.

 

From 2019 TundraSolutions, likely the harness/connections/driver: “P1613 is an Air Injection Control Driver Malfunction Bank 1. That is the part that talks to the computer and controls the air pump and switching valve for bank 1. Diagnostic Trouble Codes P1613 and 1614 fall into the electrical fault category of failures in the secondary air injection system and are two codes we do not have a solution for yet. Typically when we see this code it means the driver is damaged and simply needs to be replaced. It could also be wiring but so check all the connectors and wiring between the driver and the ECM before replacing because if it is in the wiring a new driver will not fix the problem.

I have bought a few good used ones on Ebay so just search for the stock part number or a superseded part number to get a replacement. They are usually about $80-100 used and $150-200 new.”

 

Okay so on my way home I fiddled with some connections and cleared the codes and drove home(about 25 miles) with no codes and no limp mode, I guess we’ll see what happens tomorrow when I go to work

 

Sounds like connectors are vibrating loose. Maybe a cracked retainer that's slipping the connector loose.

 

So on my way to work the codes came back and so did limp mode, I brought an old valve from when the system was still operating and I hade to replace one of them. I switched the plug to the old one which is a Toyota oem part and the codes have stayed off, I’m thinking the valve I had was defective or just cheap(I hade just replaced it last week) high hopes

 

So I’ve been drinking for two days now with the oem part plugged in and no check engine or limp mode

 

Quite the little bender you're on there

Incidentally, has anyone ever heard of SAIS going bad on 2.5 gens? Not even quite sure they have them but I was recently told that the problem isn't limited to just the 2nd gen years.

 

It’s possible to go bad, but Toyota improved the design alot. I just took out a full pump unit and you can see the intakes for it are way more protected than the Gen2 ones were. Water being the main killer of the system, the other is the valves simply go bad (usually from water intrusion though).

 

So 2014-2021 models still have SAIPs....

 

Oh for sure! Only difference is the inlet/snorkel design as far as I can tell. It’ll still go into limp mode if something goes wrong a well.