jweck1985

Hi all,
I have the tuned pcm from zzp witch has been great, but I tried to go through emissions and it will not pass due to obd readiness? They said that it can tell that it's not pcm? Wtf do I do now? Any help would be great thanks

Snail_SS

iTrader: (3)

How long have you had the pcm for?

jweck1985

Like 6 months or so

jweck1985

Oh and zzp is no help! They won't answer my emails

umrdyldo

iTrader: (1)

Your OBD II readiness monitors are not set. Happens to me every year because I am constantly adjusting tunes and reflashing the computer. You have to do the drive cycle. I even tried tricking the computer for everything to ready but our ECM's are set up so you can't. For example, in my LS1 GTO you can trick the sensor into always being ready so when it comes time for inspection, the computer passes no problem.

Here is a link and the actual drive cyle. It took me about 5 times to get them to ready and pass so don't expect it to work on the first or even third try.

General Motors Driving Cycle

General Motors Driving Cycle
A complete driving cycle should perform diagnostics on all systems. A complete driving cycle can be done in under fifteen minutes.

To perform an OBDII Driving cycle do the following:

Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 50°C (122°F) and within 6°C (11°F) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.

Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.

Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.

Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.

Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 32km/hr (20 mph). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.

Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.

Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.

Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

umrdyldo

iTrader: (1)

Get an android phone and the Torque app with a bluetooth OBD2 scanner.

Torque app allows you to see the readiness tests.

Snail_SS

iTrader: (3)

Yeah that's the reason I asked how long he had it for maybe he doesn't drive long distances

umrdyldo

iTrader: (1)

If using the Torque app and you get all of the readiness tests completed. Drive to the damn inspection shop immediately.

Devin86

So a tuned pcm won't pass smog?? I have a spare 08 pcm should I tune that pcm and leave my stocker on the stock file for smog?? I ask because my stock pcm is trifecta tuned atm, i now got hp tuners and was gonna tune the stock pcm this winter. But would doing the spare be easier or mabe get a pcm from zzp with the same Vin and tune that. I'm in CA so idk if they will check the pcm lol had my car 3 years never had to smog it yet

Snail_SS

iTrader: (3)

Same thing will happen if you change it, the test won't be ready just follow the steps provided on top

SR Tech

iTrader: (2)

Did you put that you are catless in the drop down menu when you bought it? If you don't specify not to, they will turn off the p0420 code and other downstream 02 codes to make sure the CEL doesn't come on. By doing this it does not allow the PCM to run the monitors on the o2/02heater and catalyst. And those monitors will be open and not allow you to pass an obd inspection

ae_xiong

iTrader: (3)

Does anyone know how to turn the rear o2 sensor back on? Would u be able to do it on the standard hpt or does it require pro?

umrdyldo

iTrader: (1)

All they do is disable the codes in HPT I assume.

Open the Tune in the VCM Editor. Go to Engine Diag tab. Enable the P0420 code or whatever it is for the downpipe sensor.

blueLNFftw

iTrader: (16)

You can send me the PCM with the ZZP tune on it. You will have to pay for the credits and shipping, but I will fix the codes for the tests to run.

ae_xiong

iTrader: (3)

Forgot I asked in here too. Lol thanks! I will try this.