Hello Everyone,
I was reading the coffee table articles in the Tech Folder about AIH delete along with the video. The video didn't mention anything about the delete causing a "soft code" so I was also looking at some U-Tube vids about it and they mentioned a "soft code" would show up after the delete. What does it mean to throw a soft code, will it illuminate the CEL, and is there a way to not have the delete throw a code?

Thanks

 

CEL won't come on, but when you run codes with a scanner it will supposedly throw the P0541 code "Intake Air Heater Relay 1 Low". There is a cable that fools the PCM from throwing the code if it suits you. https://www.riffraffdiesel.com/air-i...de-eliminator/
I deleted mine and didn't buy the cable. I have yet to see a soft code in Torque Pro with my OBDII dongle

 

Thanks CousinCarl for the info and the link.

 

Just to add a detail, if the truck has a GPCM (CA models mostly) instead of a GPR, the code eliminator wire will not prevent the code.

I have that T shirt.

 

It amazes me why people delete these regardless of Geographical location. . Causes no restriction appreciable or even measurable and when working assists the idle at cold temperatures.

BTW: On the CA or later Federal ECGPM, put a 1 OHM Diode in line and you won't get a DTC.

 

I deleted the AIH in the OEM system 7 years ago simply because I felt like it and wanted to install a boost gauge in that location. I later installed a T4 turbo system and still have not missed the AIH, not one bit.

In addition, I thought there were specific atmospheric and vehicle conditions that had to be met before the for the AIH would work.

After a quick Google search I found this...The AIH rarely cycles "ON" and is only used when the following conditions are met:
• Transmission is in park (automatic) or neutral (manual).

• Parking brake is set (applies to manual transmissions only).

• Engine oil temperature (EOT) is below 131° F (55° C).

• Engine speed is above 1,000 rpm.

• Intake air temperature (IAT) is below 32° F (0° C) if engine high idle is ~1,000 rpm, IAT below 14° F (-10° C) if engine high idle is ~1,100 rpm.

• System voltage to PCM is between 11.8 and 15.0 volts.

• Glow plugs are deactivated (not currently cycling).

• Brake pedal is NOT depressed.

• Accelerator pedal is in the idle position (not depressed).

I have not finished my coffee yet, so I am going to leave it at that and not take a look in the Ford Service Manual PCED at this time.