Roush SuperCharger Kit - low power, throttle closing on 50%, fault P0112

[elsonadi]

Hey,

I've got problem with my 2019 Mustang with SuperCharger Kit from Roush

I was on dynamometer and its got only around 280km power while it should've 700km around

I've got IAT sensor fault code P0112, it shows always 85 Celsius on Forscan

The other fault code is P0072

Replaced the sensor,nothing changed

Also on the counters in car I cant see the temp of the intake

The MAP wires (black,Red and Green) are all good plugged into right places

Also power is supplied to the IAT sensor

[
Hey, have the power loss in my VI gen facelift with a Roush supercharger. Got around 280KM on dynamometer and 380nm but should be probably a bit over 700km!!

I ran log tests during acceleration from 3,000-7,000 rpm (throttle opening, ignition advance angle, load, VCT intake, VCT exhaust) and it turned out that it's probably closing the throttle to 50% because the LOAD and TP values are half of what they should be.

The computer detects errors:

- P0072 (low signal value in the ambient air temperature sensor circuit)

- P0112 (low signal value in the IAT sensor circuit)

So it doesn't display the intake temperature on the instrument cluster.

Swapping the sensor to the left of the compressor doesn't change anything. Today I checked the sensor located in front of the compressor (boost pressure sensor) - its numbers are 0 261 230 280, and I replaced it with 0 261 230 334.

Furthermore, the three wires in the computer connector are connected to the correct pins.

And I still can't see any The throttle module itself, most likely the throttle body, which I spotted in the Roush Kit installation documentation.

Is there anything I should look out for regarding these errors?

Thanks in advance ]

What could be wrong?

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[elsonadi]

nobody can help?

 

[Skye]

https://www.mustang6g.com/forums/threads/ambient-air-temp-sensor-location.145517/

You listed a problem with the ambient air temperature circuit. By coincidence, I recently pulled some diagrams from the thread above. Included with the posts is a procedure to reset that sensor, if troubleshooting or after replacement. IDK if anything there could help.

https://www.google.com/search?q=mus...HQYBPEAQrQIoAnoECBgQAw&biw=1463&bih=741&dpr=2

 

[elsonadi]

https://www.mustang6g.com/forums/threads/ambient-air-temp-sensor-location.145517/

You listed a problem with the ambient air temperature circuit. By coincidence, I recently pulled some diagrams from the thread above. Included with the posts is a procedure to reset that sensor, if troubleshooting or after replacement. IDK if anything there could help.

https://www.google.com/search?q=mus...HQYBPEAQrQIoAnoECBgQAw&biw=1463&bih=741&dpr=2

Thank you for your answer. This is about the P0072 code, what about the other fault code with IAT sensor that's not even showing the inlet temperature on indicators?

 

[Stage_3]

I ran log tests during acceleration from 3,000-7,000 rpm (throttle opening, ignition advance angle, load, VCT intake, VCT exhaust) and it turned out that it's probably closing the throttle to 50% because the LOAD and TP values are half of what they should be.

The computer detects errors:

- P0072 (low signal value in the ambient air temperature sensor circuit)

- P0112 (low signal value in the IAT sensor circuit)

So it doesn't display the intake temperature on the instrument cluster.

It sounds like an installation problem. Maybe one of those wires got damaged while under install?

Can you bring it back to the shop that did the install? Or, did you do the install at home?

 

[elsonadi]

It sounds like an installation problem. Maybe one of those wires got damaged while under install?

Can you bring it back to the shop that did the install? Or, did you do the install at home?

Thanks for answer


I've bought the car (imported from USA) with Roush Supercharger Kit already installed there. I don't know who did that even, but as I remember from the start the inlet temp wasn't showing on the indicators in car, so the problem with the IAT sensor must've been from the beginning I've got the car. No idea how it was performing before. I've bought the car with front damage (few cables on the front were damaged, but I soldered them while repairing). Maybe the "map engine" needs to be checked in PCM module?

Greetings from Poland

 

[Stage_3]

Good luck @elsonadi
I hope it all works out for you.

BTW,....my mom came over to America from Poland many, many years ago. She was from Kobylin.

 

[HKusp]

I would get in the Roush thread in the forced induction forum. Those guys will point you in the right direction.

https://www.mustang6g.com/forums/th...actually-have-the-the-roush-kit.127474/unread

 

[SH!FT]

It sounds like an installation problem. Maybe one of those wires got damaged while under install?

Can you bring it back to the shop that did the install? Or, did you do the install at home?

I agree with @Stage_3 . There are plenty of opportunities for this harness to be unplugged, pinched, melted by the exhaust, or chewed by mice. Inspecting the 1318-12B579W harness would be a good start.

Oh! I just read more of your previous posts..
Sounds like you are saying the car runs fine (minus the DTC's occurring at 100% throttle) but the PCM thinks it's heat soaked?

I would expect the PCM to aggressively pull timing if it thinks ACT is 85 C (185 F). The Roush calibration should maintain ~18 degrees spark adv. during optimal conditions. I would expect more serious issues if the MAP sensor was malfunctioning.

Roush part number for the harness is in the install link below. The ACT sensor is transferred from the OEM 2018+ intake manifold.

https://www.roushperformance.com/cd...E-Mustang_20230816.pdf?v=12456078069995145428

 

[SH!FT]

Frontend damage?!? Does it run any different if you unplug the ambient sensor behind the front bumper?

Does it run any different if you unplug the ACT sensor?

 

[elsonadi]

Frontend damage?!? Does it run any different if you unplug the ambient sensor behind the front bumper?

Does it run any different if you unplug the ACT sensor?

Sorry for not fast response, but I'll be more online now.

Yeah, it was front damaged. Not much, but still.

I had a damaged wiring harness in front (attaching photo), but I think I resoldered (connected) the wires correctly. I can check that again...

Regarding the IAT sensor, I tried checking it in Forscan with it disconnected and connected, but the error still persisted the same.

I haven't disconnected or replaced the outside temperature sensor yet.

Also got questions:

1) Is there a chance that the outside temperature sensor could be causing the IAT sensor error, or does that have no effect?

2) Is it worth checking the engine map? How can I check it?

3) I remember that the battery was practically dead during transport to Poland, so could that 'damage' the map somehow?

BTW: The IAT sensor cables (harness) are OK, and the voltages are working. The cables to the computer and the plugs are also OK. Replacing the sensors didn't help.

BTW2: I checked the outside temperature sensor and it's damaged. I ordered new one. But could this affect the IAT sensor and the overall power issue?

Answer from ChatGPT: "Yes, the ambient air temperature sensor can influence the intake air temperature (IAT) sensor by transmitting data to the engine control unit, which uses it to calculate the intake air temperature. The IAT sensor then adjusts the air-fuel mixture to optimally utilize the air at this temperature."

 

[elsonadi]

I agree with @Stage_3 . There are plenty of opportunities for this harness to be unplugged, pinched, melted by the exhaust, or chewed by mice. Inspecting the 1318-12B579W harness would be a good start.

Oh! I just read more of your previous posts..
Sounds like you are saying the car runs fine (minus the DTC's occurring at 100% throttle) but the PCM thinks it's heat soaked?

I would expect the PCM to aggressively pull timing if it thinks ACT is 85 C (185 F). The Roush calibration should maintain ~18 degrees spark adv. during optimal conditions. I would expect more serious issues if the MAP sensor was malfunctioning.

Roush part number for the harness is in the install link below. The ACT sensor is transferred from the OEM 2018+ intake manifold.

https://www.roushperformance.com/cd...E-Mustang_20230816.pdf?v=12456078069995145428

Probably fixed the problem.

Changed the outside temperature sensor (worth 3$) from bumper and the fault codes from this sensor and IAT sensor both disappeared. Check engine on indicators disappeared. And the temperaturę of Air dolot appeared.

Tried it while riding and the difference is noticeable. This is pure a beast now.

 

[SH!FT]

Nice! I’m not exactly sure what parameters are calculated using the ambient probe on the crash bar but that makes sense.

You can use the RDT software to confirm the original parameters and sensors in question. SIP is the sensor mounted on the blower. ACT/MCT and MAP are the 2 sensors mounted on the intake manifold. SIP and MAP should read about 14.7 with the engine off.

 

[elsonadi]

Nice! I’m not exactly sure what parameters are calculated using the ambient probe on the crash bar but that makes sense.

You can use the RDT software to confirm the original parameters and sensors in question. SIP is the sensor mounted on the blower. ACT/MCT and MAP are the 2 sensors mounted on the intake manifold. SIP and MAP should read about 14.7 with the engine off.

Thanks! I've ELM327 diagnostic interface for forscan. Can I connect with this interface? Or do I need different? Of maybe can I check ACT and MAP prameters in Forscan?

 

[elsonadi]

Did about 30mil with the car, checked the forscan and got these fault codes:

P0153 - slow response of O2 (Oxygen) circuit (on Bank 2, Sensor 1)

P0133 - slow response of O2 (Oxygen) circuit (on Bank 1, Sensor 1)

Is it something serious?

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