New codes thrown

Got a check engine light pop up on my truck today. got it read and had multiple codes:

P0328 (Knock sensor 1 circuit High Input Bank 1)

B1660 (Passenger seat airbag active mode indicator malfunction)

The knock sensor i have been suspicious of for over a year now. occasionally would make some knocking on cold starts but never threw a code and i couldnt figure out what was up. I tried higher octane gas and nothing changed. Im not sure what "high input" means though. wouldnt that mean that the unit sending power (ecu) is malfunctioning?

The airbag i had no idea about, but the light does stay on for a second after i start the truck. Not sure what the code means though.

Some truck background info:
- 2006 tacoma trd offroad v6 6MT

- tuned using HP tuners and a map that was made for me by a fellow member. i literally drove across country and back (10,000+ mi) this past june and it had no issues.

- no other real mods and the truck is mechanically stock.

- i have started parking it in a new place as of recent which is a dirt parking lot with lots of other cars. i am wondering if mice/squirrels could be a possibility, but also not sure if they would be that quick to get in there. i only have had it in that lot 1 week.

any help would be greatly appreciated!

 

nobody?

 

The high input means that your ECU is detecting a higher than normal voltage coming from the knock sensor. I would check and make sure the wires insulation are good. Take the connector off and make sure the pins are not corroded. Clean them if there corrosion on them. If you can’t clean the corrosion the only option is to replace the connector. It can be a bad sensor and last would be a bad ecu.

 

that sounds lovely and easy, but doesnt it require removing the intake, manifold, and more to get to these connectors?

 

Read this thread

https://www.tacomaworld.com/threads/knock-sensor-position-on-v6-left-or-right.193456/

 

The p0328 is for an open knock sensor circuit on bank 1.
It's very common for critters to chew the wires off the knock sensors, unfortunately they are a pain to get at as they are in the valley of the engine under the lower intake and water outlet pipe that is sandwiched under the cylinder head intake ports. Some members have fixed them without removing the coolant pipe assembly but it can be removed if the brackets that hold them together are cut.

 

The B1660 is a problem in the passenger airbag on/off light circuit, most likely a broken/corroded wire or cracked solder joint in the warning light assembly.

 

thanks guys. i assume if i pull that water pipe off i will need to drain the cooling system? probably would be good to flush it anyways...

sucks this happens as soon as i have 0 access to a shop and very limited hand tools at school.

will i damage anything if i continue to drive for a couple weeks until thanksgiving break when i can bring it back into my shop?

 

Yes you will have to drain the cooling system, no you shouldn't damage anything although the ECM will retard ignition timing and thus reduce power and fuel economy with that code present.

 

thank you so much. thats all i needed to hear. i will limp her around until i can dig in.

 

I also forgot to mention that I did just replace my battery. Could this have any affect or cause these codes? There should be no issues with that affecting ecu as i have replaced batteries before, and know the process of removing ground, then pos terminals so there is no arcing. The code did not come back on my drive home after it was cleared. I will see later today if it comes back.

Ive found that most people with the issue of mice chewing the wires got a P0333 code, not the P0328 which makes me wonder if it is the same thing or not.

 

I wouldn't think it has anything to do with replacing the battery, you can always clear it and see if it comes back. The only way to check it without a scope is ohming the wire as outlined in the code troubleshooting guide, you can't really see the wiring under the intake unless you can see damage elsewhere.

 

Now that you say that, there is a scope back at home on one of the work vans. I can see if I can fit that in there and look around without pulling it all apart.

Thanks again

 

When I said scope I mean oscilloscope (really the only way to test a knock sensor aside from measuring it's resistance) but if you could get a borescope down in there to look at the wiring that would be useful too.
It's very rare for a knock sensor to fail so I would suspect a wiring issue before a failed sensor.

 

Ohh i see. Unfortunately we don't carry oscilloscopes in the electrical vans haha. I assume i should replace both the sensors themselves when in there though, right?

Or would that be a waste?

Best way to keep the mice out after the repair? It would be a huuuuuge bummer if this happened again...

 

@emmett What'd you end up coming up with for a resolution? I'm currently dealing with the same P0238 issue on my 09 tacoma, but it only comes on intermittently so I'm doubting that it's chewed wires. Thanks!