[taranfx]

I've catless downpipe with MHD tune.

Im in CA.

I found couple of smog shops who were ready to help me "make it pass" but they said they couldn't because Catalyst shows as "incomplete" and Heated catalyst "not avail".
Oxygen sensors show complete.

One of them suggested to get ECU coded to disable the monitors. but I havent found any ECU tuner who is willing to do that

What causes it to be incomplete? Is it just that it needs some driving? What are my options? Should i flash to stage0 and then try?



p.s.
Sorry if this is asked before but I didnt find a post with exact same issue.

[sbsk518]

Install DP fix. Flash MHD back to 0 and select "Catted Downpipe" in the options menu. Then drive it around (I believe 40-60mph not exceeding 3000 rpms sets the monitor but could be mistaken). Should allow your Catalyst monitor to set.

[dpaul]

Originally Posted by taranfx

I've catless downpipe with MHD tune.

Im in CA.

I found couple of smog shops who were ready to help me "make it pass" but they said they couldn't because Catalyst shows as "incomplete" and Heated catalyst "not avail".
Oxygen sensors show complete.

One of them suggested to get ECU coded to disable the monitors. but I havent found any ECU tuner who is willing to do that

What causes it to be incomplete? Is it just that it needs some driving? What are my options? Should i flash to stage0 and then try?



p.s.
Sorry if this is asked before but I didnt find a post with exact same issue.

Disabling the OBDII emission monitors is exactly what MHD does. The monitors are inhibited from performing whatever test they were going to perform. Thus, the monitors show NOT READY or INCOMPLETE. If the cat monitor was allowed to complete, if would find you had no cats and set FAIL . No tuner can make the DME report READY when the cats are not present.

Your solutions are DPfix, as suggested by sbsk518 or re-install your catted downpipes. If you choose the DPfix, be aware that over time it will affect your fuel trims. So it is not advisable to leave it installed, unless you can find one with an easily accessible switch to take it out of the circuit.

[taranfx]

Originally Posted by sbsk518

Install DP fix. Flash MHD back to 0 and select "Catted Downpipe" in the options menu. Then drive it around (I believe 40-60mph not exceeding 3000 rpms sets the monitor but could be mistaken). Should allow your Catalyst monitor to set.

Thank you!

[taranfx]

Originally Posted by dpaul

Disabling the OBDII emission monitors is exactly what MHD does. The monitors are inhibited from performing whatever test they were going to perform. Thus, the monitors show NOT READY or INCOMPLETE. If the cat monitor was allowed to complete, if would find you had no cats and set FAIL . No tuner can make the DME report READY when the cats are not present.

Your solutions are DPfix, as suggested by sbsk518 or re-install your catted downpipes. If you choose the DPfix, be aware that over time it will affect your fuel trims. So it is not advisable to leave it installed, unless you can find one with an easily accessible switch to take it out of the circuit.

very helpful

[taranfx]

Installed dpfix, flashed map0 with "OEM/catted dp". Drove at least 100 miles on highway

Still cat shows incomplete. What's happening. Also 29f4 didn't go away until I cleared it

[dpaul]

Originally Posted by taranfx

Installed dpfix, flashed map0 with OEM/chatted do. Drove at least 100 miles on highway

Still cat shows incomplete. What's happening. Also 29f4 didn't go away until I cleared it

1) What does "with OEM/chatted do" mean?

2) Also, although I think 100 miles of any kind of driving should set the monitors, there is an industry-defined standard drive cycle.

Something like:
A) tank 1/4 to 3/4 full 2
B) Start with engine completely cold
C) let idle 2-5 minutes
D) drive 20-40 mph for 5 minutes not exceeding 3k rpm
E) drive 40-60 mph for 10 min again not exceeding 3K
F) don't ever use full throttle during the cycle
G) idle warm for 5 min before turning engine off.
H) Sometimes, a second drive cycle is needed, especially for the evap flag.

[sbsk518]

29F4/29F5 codes relate to catless DPs. They may take several driving cycles to clear automatically if the DP fix is set correctly. If you cleared the codes and they return, the DP fix is not probably not set high enough or is installed incorrectly. The 5oclock setting works for most people but it may need to be adjusted. Just leave the cowl off so you can access the DME easily for adjustments and try diving the cycle as dpaul suggested.

[CarAbuser]

I can make the monitor read "not available". That's different to incomplete as it means the readiness routine isn't run for it.

If the garage will let you do that just PM your binary file and I'll make the change.

In theory it's also possible to make the monitor read complete when catless with the ECU tune but I haven't tested it properly as monitors aren't checked here.

[CarAbuser]

Originally Posted by dpaul

Disabling the OBDII emission monitors is exactly what MHD does. The monitors are inhibited from performing whatever test they were going to perform. Thus, the monitors show NOT READY or INCOMPLETE. If the cat monitor was allowed to complete, if would find you had no cats and set FAIL . No tuner can make the DME report READY when the cats are not present.

Your solutions are DPfix, as suggested by sbsk518 or re-install your catted downpipes. If you choose the DPfix, be aware that over time it will affect your fuel trims. So it is not advisable to leave it installed, unless you can find one with an easily accessible switch to take it out of the circuit.

MHD doesn't disable the monitors, it disables the CEL related to catalyst efficiency failure. The routines are still performed and they return a failure, hence the incomplete status.

[taranfx]

Originally Posted by CarAbuser

I can make the monitor read "not available". That's different to incomplete as it means the readiness routine isn't run for it.

If the garage will let you do that just PM your binary file and I'll make the change.

In theory it's also possible to make the monitor read complete when catless with the ECU tune but I haven't tested it properly as monitors aren't checked here.

is it possible to create a custom map that can disable those monitors and flash with mhd?

[taranfx]

Originally Posted by dpaul

1) What does "with OEM/chatted do" mean?

2) Also, although I think 100 miles of any kind of driving should set the monitors, there is an industry-defined standard drive cycle.

Something like:
A) tank 1/4 to 3/4 full 2
B) Start with engine completely cold
C) let idle 2-5 minutes
D) drive 20-40 mph for 5 minutes not exceeding 3k rpm
E) drive 40-60 mph for 10 min again not exceeding 3K
F) don't ever use full throttle during the cycle
G) idle warm for 5 min before turning engine off.
H) Sometimes, a second drive cycle is needed, especially for the evap flag.

changed dpfix to 4o clock position. did a drive cycle. code didn't come up again but it's still incomplete

[dpaul]

Originally Posted by CarAbuser

MHD doesn't disable the monitors, it disables the CEL related to catalyst efficiency failure. The routines are still performed and they return a failure, hence the incomplete status.

Yes, I should have said "disables monitor reporting".

Sure, you can make the monitor report "Not Available" but if you do that to the cat monitor you fail inspection in Massachusetts. I doubt any state allows "Not Available" for the cat monitor. I don't know what the rules are in England.

I'd be really surprised if simple parameter code changes would allow the DME to report "complete" in the absence of cats. Perhaps you mean that you've disassembled enough program code to find the routines and bypass them. My point was that no professional tuner would do that for you (in the US). And why would anyone outside of California even bother with it? Everywhere else you're allowed one INCOMPLETE so it's much simpler to toggle the relevant code in the DTC table and be done with it.

[CarAbuser]

Originally Posted by taranfx

is it possible to create a custom map that can disable those monitors and flash with mhd?

Yes, just send your stock bin via PM and I'll disable the monitors. If they are happy to pass the car with a disabled cat monitor then you'll be fine. I'm not familiar with American vehicle inspection process though, common sense should tell them that all modern cars should have CAT efficiency monitors.

[CarAbuser]

Originally Posted by dpaul

Yes, I should have said "disables monitor reporting".

Sure, you can make the monitor report "Not Available" but if you do that to the cat monitor you fail inspection in Massachusetts. I doubt any state allows "Not Available" for the cat monitor. I don't know what the rules are in England.

I'd be really surprised if simple parameter code changes would allow the DME to report "complete" in the absence of cats. Perhaps you mean that you've disassembled enough program code to find the routines and bypass them. My point was that no professional tuner would do that for you (in the US). And why would anyone outside of California even bother with it? Everywhere else you're allowed one INCOMPLETE so it's much simpler to toggle the relevant code in the DTC table and be done with it.

Program changes would be needed to force the status monitors to a pass state but it should be possible to get the monitor to return a pass using calibration changes. I've seen it work for people with high flow cats where they are on the threshold of passing and failing.

It's not really relevant for the rest of the world which is probably why nobody has bothered looking into it. But it seems mad that people are wiring resistors into the sensor wiring to get a monitor to pass. I suppose people are still driving around with JB4s fitted which is essentially the same red-neck engineering.

[dpaul]

Originally Posted by CarAbuser

Program changes would be needed to force the status monitors to a pass state but it should be possible to get the monitor to return a pass using calibration changes. I've seen it work for people with high flow cats where they are on the threshold of passing and failing.

Interesting!

Originally Posted by CarAbuser

It's not really relevant for the rest of the world which is probably why nobody has bothered looking into it. But it seems mad that people are wiring resistors into the sensor wiring to get a monitor to pass. I suppose people are still driving around with JB4s fitted which is essentially the same red-neck engineering.

All true, LOL. However, I will admit a guilty pleasure watching the JB4 gauge sweep on startup.

[taranfx]

drove few more miles and it's throwing 2CA8 and 2ca9, oxygen sensor heater after catalytic.
whatsa going on