AIH Delete Question
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Junior User
Joined: Mar 2020
Posts: 98
Likes: 0
From: Port Angels, WA
AIH Delete Question
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
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
Fleet Mechanic
Joined: Oct 2008
Posts: 1,321
Likes: 250
From: North Texas
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
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
I deleted mine and didn't buy the cable. I have yet to see a soft code in Torque Pro with my OBDII dongle
More Turbo
Joined: May 2016
Posts: 717
Likes: 9
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.
BTW: On the CA or later Federal ECGPM, put a 1 OHM Diode in line and you won't get a DTC.
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,354
Likes: 5,946
From: Lake Hartwell, GA
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.
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.
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