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01 Z06, have a recurring P0410 AIR code... been through the entire air pump, vacuum actuator valve, input & outflow hoses, & check valves seem ok. Clear the codes & it comes back on the 3rd drive after clearing when you get on the gas. NOT at startup when it's supposed to be running & going through its routine checks... any ideas? The mystery to me is that it never happens on startup, when logically it should, so just a tad perplexed...
01 Z06, have a recurring P0410 AIR code... been through the entire air pump, vacuum actuator valve, input & outflow hoses, & check valves seem ok. Clear the codes & it comes back on the 3rd drive after clearing when you get on the gas. NOT at startup when it's supposed to be running & going through its routine checks... any ideas? The mystery to me is that it never happens on startup, when logically it should, so just a tad perplexed...
The PCM does NOT accomplish the “AIR monitor test” on startup !!...the engine must be in “closed loop” and the PCM is looking for the O2’s to go lean (less than 222 Mv for 1.3 seconds)...without a bi directional scan tool / or Tech 2 you don’t know if the solenoid is being grounded by the PCM (which allows you to do with the Tech 2 and also run the pump)...do you hear the pump at startup and have you checked for the volume of its airflow ??...have you checked for power at the solenoid ??...the pink wire ??...how did you check that the shut off valve is functioning properly ??...”seems OK” is not good troubleshooting !!!!
he PCM does NOT accomplish the “AIR monitor test” on startup !!...the engine must be in “closed loop” and the PCM is looking for the O2’s to go lean (less than 222 Mv for 1.3 seconds)...without a bi directional scan tool / or Tech 2 you don’t know if the solenoid is being grounded by the PCM (which allows you to do with the Tech 2 and also run the pump)...do you hear the pump at startup and have you checked for the volume of its airflow ??...have you checked for power at the solenoid ??...the pink wire ??...how did you check that the shut off valve is functioning properly ??...”seems OK” is not good troubleshooting !!!!
I can hear the pump, have disconnected the outlet hose at the LF fender area & lots of airflow FROM the pump, & suction on the other end towards the exhaust mani check valve. I do have a Tech II, & haven't checked power at the solenoid (assume you mean the vacuum solenoid on LF fender by the PCM), but planned to do so shortly, & have a new solenoid to swap if needed. I'll use your suggestions & see if I can isolate the issue. Thanks a bunch for your reply!
And when would it actually go into closed loop operation?
It will go into closed loop in 30-60 seconds or so...your Tech 2 will tell you !!...look at loop status...it will say either open or closed...you can command the vacuum controlled solenoid to operate too (yes, it’s the one above the PCM)....the shut off valve is located on the pump...run the car and command the PCM to ground the solenoid ...now see if you have vacuum at the shut off valve (can also be confirmed by removing the connector and connecting a 12 volt test light to battery positive...command the solenoid to energize and see if the test light illuminates when probing the purple wire...and make sure you have 12 volts at the pink wire. Hope you don’t use the Tech 2 just to read codes ??...you have a VERY powerful diagnostic tool in your hands !!!
Checking the shutoff valve this morning... I see you're in Monmouth County, my family's from Newark/Livingston, & I used to live in Asbury Park... small world...
Checking the shutoff valve this morning... I see you're in Monmouth County, my family's from Newark/Livingston, & I used to live in Asbury Park... small world...
Great !!...good luck...if you look under “active tests” on the Tech 2 you should see the AIR system...like I had said you can command the circuits to energize via the Tech 2...Asbury Park is a little better than it used to be...hopefully I’ll be retired to Florida in a few months and be out of this state !!
Ok, everything points to the AIR solenoid- air comes out of the pump hose (post shutoff valve) only if I put my mityvac on the vacuum nipple for the shutoff valve & put 10-15 inches of vacuum on it. It sees nothing from the vacuum line from the solenoid (at the shutoff valve, anyway). When commanded on, you can hear the air being sucked into the pump at the air filter box, so I think with your advice have it narrowed down to the solenoid. Since I already ordered a replacement then should be good once that,s replaced. I guesss I should probably check at the solenoid to see if it's getting power while I'm at it...
Good troubleshooting !!!...yes, make sure you have power at the solenoid pink wire...if you have a 12 volt test light connect it to battery POSITIVE and touch the tip to the other solenoid wire while commanding the solenoid on...you want to make sure the test light illuminates telling you that the PCM is grounding that wire !!...nice you have a Mityvac to help diagnosing this issue !!...you should hear the relay click when you command it on !!
Report- get 12V from pink with 12V tester lead to battery Negative, hooked to Positive, pink doesn't illuminate but purple does with reverse polarity... that make sense?
To clarify that last post, hooking the tester to battery positive & probe to pink wire at solenoid= nothing. Taking probe to the purple wire it shows green lite (negative polarity). When lead hooked to battery negative, get red light at pink. Nothing at purple...
To test power at pink wire clip test light to a ground....light will light when you get 12 volts !!...now to check that the purple wire which receives a ground from the PCM connect test light to battery POSITIVE...now take the Tech 2 and command the solenoid... the PCM completes that ground and test light will light when you probe the purple wire.
Affirmative... that's exactly the results that I got... so just will wait until the solenoid gets here Monday, getting to that sucker is a little tricky...trying to thread that nut back on up there is going to be trickier, but I'll manage. Thanks for all your help! After this I have to tackle the tach not working, with the P0654 code, IPC connectors possibly...
That’s great !!...you have to ALWAYS check the wiring before changing any electrical component such as this solenoid...so the test light illuminated when you commanded the scan tool to energize the PCM ground on and off ??...good video enclosed !!
Buttoned it up, last night, today it's giving a P0412 code... air pump relay, I'll quickly swap the AIR relay with the horn relay & see what happens, gut says that's not magically it. Wondering if I pulled a wire on the solenoid that would affect something more downstream. With the engine running though, it seems to be idling better than it was, although it is idling at ~800... my C6 idles smoothly at 650... it's not being fun anymore!
Note.... commanding AIR system ON with TechII starts pump right up... gonna check airflow at the outlet hose to see if the vacuum switch is really opening by the solenoid...
No airflow from outlet of pump... since power was ok at the solenoid it's gotta be either the vacuum lines to or from the solenoid, or the solenoid I got is DOA... back into the fender I go!
Buttoned it up, last night, today it's giving a P0412 code... air pump relay, I'll quickly swap the AIR relay with the horn relay & see what happens, gut says that's not magically it. Wondering if I pulled a wire on the solenoid that would affect something more downstream. With the engine running though, it seems to be idling better than it was, although it is idling at ~800... my C6 idles smoothly at 650... it's not being fun anymore!
If you possibly have a vacuum leak look at your fuel trims with the Tech 2 and see what it is...let us know what you have...if fuel trims are elevated at say 10% or so rev the engine to 3000 RPM for a few minutes ...short terms will decrease instantly and long terms will decrease in a few minutes...if those fuel trims decrease you have a vacuum leak !’
A.) The new AIR solenoid was bad, it's connection pins are very loose & when wiggling the solenoid with it plugged in & energized it clicks on & off with each shake... verified that the old one is actually ok. Vacuum line to pump shutoff valve ok, putting vacuum on it from the solenoid side brought the pump airflow to life.
B.) No vacuum from the supply side vacuum line from the manifold... or is it directly to the intake manifold? That line has no vacuum at idle, & HOLDS vacuum with the mityvac... if straight to the manifold it shouldn't hold vacuum. Thought I read somewhere that there's another vacuum splitter/valve that ties into the A/C? Let me search the forum, before I try to trace that line to see if there's a blockage, or if in fact it's a part somewhere further between the manifold & the source to the solenoid... TBC
AIR P0410 code, brain teaser
