Well at the start it was great modded the auto harness, which was really removing all the auto crap and connectors added in the wiring for the emissions vsvs and added in the wires for the 2nd o2 sensor. A year later i went to renew my registration and do my smog. well I failed my smog running to rich on idle and leaning out on load. Fine I thought ill get some plugs and wires and tune it and all will be well. Unfortunately the douche doing my smog decided that since I swapped my motor and it didn't have the Egr that was on the old motor that he would send me to the dmv for an inspection from the smog guys. Im no required to smog my truck like a 2002. the obd2 plug is all wired up but its not reading the o2 sensors correctly. Now im back at square one. Some where in my wiring something is wrong. It doesn't through any codes for the o2s even when they are disconnected. I didnt have the mrel wire hooked up and also dont have the sta wire hooked up. I got the mrel tied into the main relay just like the diagram shows, I read in the manual that upon turning off the car mrel provides power for an extra 2 seconds to set the iac. Still not thowing any codes but still running rich.
Im using a scantool that connects to my laptop, with the scanmaster software, it constantly warns me that i wont pass emissions and doesnt pick up anything from the o2 sensors plugged in or not. perhaps I need a different perspective. IDEAS ANYONE?? i contacted toyonlyswaps.com to see if they would go over it, but I havent heard back from them yet, I just called today so if they cant hit me back till next week I won't be offended. Just looking for some perspective. I can tell you getting these 3.4s to run is easy but the whole o2 thing has got my panties all in a bunch. THX for reading guys n gals. Yotatech rocks the house. btw i dont think its cause the ecu isnt getting constant power cause i have thrown codes for the igniter which stayed on till i cleared them and once my connector for the crank sensor came unplugged and it held the code until i plugged it back in and cleared it.

 

i'm confused. You have a 91 truck with a 3.4 in it now and they are trying to hold you to 2002 standards? I'd fight that.

From what little I know about the laptops / scan tools the message about it not passing inspection is likely caused by the fact that the "monitors" have not yet been passed. You can clear all the codes in memory but it also resets these checks that are used for smog inspection to prevent people from just clearing the codes and then driving in for an inspection. Every vehicle is different but you can google the requirements for your vehicle's "drive cycle". For my 01 Maxima I had to drive in different gears, idle, start / stop engine, idle, drive at certain speed, constant throttle etc. This would all happen eventually during normal driving but since i had changed a CAT and O2 sensor I was trying to get it passed quickly before inspection. IF you have something not quite hooked up right it may never pass (not sure if you have one computer that sees engine variables and speed etc.
Provide a bunch more details and someone on here can probably help more than me. (to start with tell us what engine size and year as well as ECU etc you are using)

 

Yea i had to go to the dmv and the inspector went over it. Gave me a 3 copies with a NV state stamp that said I had to be tested to 2002 standards and that I had to keep all the 2002 emissions components. DRAG CITY before i modified the harness the connections for the emissions vsvs and after cat o2 were connected from the body harness to engine harness connector. Thank fully went i got my motor i was able to swipe both the engine and body harness. I'm going to attempt to pull my harness out next weekend but in all honesty I just dont have the time to dedicate to hammering this thing out. 5 classes, a kid, a job make things hard to get done, but where there is a will there is a way.
The motor is 2002 5vz auto 4x4, ecu is 2002 5vz mt 4x4. all in all the wiring is pretty much the same, really it came down to removal of the auto wires and plugs and moving the vsv wires and o2 wires in. I did some checking of the wires but didn't strip it all the way down, looks like that is my next step, i also tried a different 2002 mt 4x4 ecu with the same results. Ill try to put some more info together for you guys as I itch my head and things come to mind. I can smell the richness of the exhaust, i did pick up some new spark plugs today and will pull the old ones tomorrow and see how fouled they are.

 

Pretty common that you have to smog to the newer piece of your vehicle; motor or actual truck.

I agree that the monitors are causing your scantool to say it is not ready for inspection.

here are the drive cycles for up to a 2002
http://home.comcast.net/~dntsdad//TS...revised%29.pdf

Secondly, since you said that you had to move the O2 sensor wires in your plugs, and now they do not work, that seems like a suitable place to double check that you have them in the right spots and that they have continuity all the way to the sensor.

 

Sweet link brother!!! Yea I got that funny feeling in my belly, the wiring looks all good on paper but when you un-tape the harness you start to get that funny feeling crawling all over your skin. Good call fellas. I got the drive cycle printing right now, my lappy battery is all charged, just gotta bust a quiz out for Humanities 102 and ill be on the road watching patiently for what the diagnostic software pops out at me.

 

I ran my truck on jackstands and got the monitors to all run without ever leaving the driveway. I dont think that the ECM will ever trip the check engine light until the correct driving pattern is achieved and the circuit fails. In this case, the O2 sensors.

You should be able to hit them all in 15-20 minutes. Hard to do sometimes on the actual road with traffic and stop signs. I found the jackstands much faster. Just remember to keep refreshing your screen on your laptop for the monitor page!!

 

Oh new question. Is my ecu supposed to be able to monitor the vehicle speed? idk if it actually is. is suppose i will know shortly if i can just stop thinking about my ride for a second and take my damn quiz. the wire from the speedo is connected but my 91 is pretty much mechanical speedometer

 

Absolutely has to be able to. You should get a CEL fairly quick if its not. Your scantool software should show the speed that the ECM is reading.

 

Darn it yep it reads the speed, secretly i was hoping that was it I know that later model integrated the speed sensor ditching the mechanical cable. Reports the speed just fine. I guess next step is to pull the harness and check the wires. GOOD CALL

 

Well put some new spark plugs in and cleaned the MAF, because they were about due raised up the rear end, and started the monitor drive pattern, yea I gotta have a crossed wire at the o2 splice. The short term trim stays at a constant 99.21% that cant be write im guessing. it must be getting voltage from some where that it shouldn't. Old girl is cooling down now, as soon as she is not so hot to handle I'm going to pull the harness out and start unwrapping. Just for kicks anyone got some numbers for the short term trim. Just so I can get some confirmation that my hypothesis is correct.

 

On both the long term and short term fuel trim - the closer to zero the better.

 

Yea that's what i was figuring. I bet I have a crossed wire then. Thx as always yotatech is the repository of all toyota knowledge. You guys are the best and I hope later down the road I can be as helpful as you guys are.

 

Well finally got those drive patterns down and done. I threw a o2 heater malfunction on second o2 replaced the sensor and got a P0420 code while getting the catalyst monitor to run. I've already replaced both sensors so I'm down to replacing the catalytic converters, this doesn't seem right they only have a year on them would a year of running to rich kill the cats. I'm going to check for exhaust leaks but I'm not sure what to do on this one. Insightful comments welcome