P38A 4.6 fault codes

Vehicle is a 4.6 "Thor".

I've never seen these fault codes when using my Nanocom (not saying they won't show, just never seen them).

Used a different diagnostic tool recently and it is displaying these fault codes:


Anyone know what they mean?

The vehicle runs very well overall. A few years ago it went on a rolling road dyno and according to that is making about bang on the factory power. Since then I've done new leads, plugs and coil packs, as it had developed a slight miss. It is now running super smooth and no misses at all.

It does seem to be slightly less frugal than it once was. I used to get about 17mpg running about. Same sort of use is now 15mpg. On a run I also can't get it above 19mpg any longer (even resetting the trip). Previously it used to see over 21mpg on the trip.

But it is lifted and on MT tyres. But the tyres have been on there for quite a while now.

It also runs a straight through exhaust system, which might contribute to the fuel trim codes.

I'm unclear what would cause a cam or rotor control fault however.

Any thoughts?

I've seen fuel trim too lean when running on lpg before i adjusted the map
I have no clue what the pending faults are, maybe misread?

1172 / 5 could be air flow related possibly maf/air leak

Live data might give a clue ?

kermit_rr said:

1172 / 5 could be air flow related possibly maf/air leak

Click to expand...

That doc shows two different descriptions for the same code??



All a bit confusing. Although I'm inclined to think the straight through exhaust might be the cause here. Although there is one thing saying lean and another saying rich....

Straight through - with or without CAT's & O2 sensors ?

pwood999 said:

Straight through - with or without CAT's & O2 sensors ?

Click to expand...

With cats, just no silencers.

It might just need the Long Term trims reset so it re-learns ? Also depends if the O2 sensor outputs are switching correctly.

pwood999 said:

It might just need the Long Term trims reset so it re-learns ? Also depends if the O2 sensor outputs are switching correctly.

Click to expand...

Can I reset these trims with a Nanocom?

300bhp/ton said:

Can I reset these trims with a Nanocom?

Click to expand...

You can

kermit_rr said:

You can

Click to expand...

Thanks.

Are you able to tell me how? I've had a play with the emulator, but not 100% sure what I should be looking for.
https://nanoint.nanocom-diagnostics.com/index.html?rand=510#

I can see under Motronic --> Utility --> Reset Adaptive Values

But I'm not sure if this is the right thing.

300bhp/ton said:

Thanks.

Are you able to tell me how? I've had a play with the emulator, but not 100% sure what I should be looking for.
https://nanoint.nanocom-diagnostics.com/index.html?rand=510#

I can see under Motronic --> Utility --> Reset Adaptive Values

But I'm not sure if this is the right thing.

Click to expand...

Yep that's it, is the only thing you can reset in the motronic ecu

Afterward it will need a few mile to sort itself out. If it goes way out there will be more investigation needed.

I wouldn't worry about pending faults. I'd reset and see if they come back.