Wire off my GPR what is it for
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04-03-2013, 12:28 PM
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Wire off my GPR what is it for
I have been digging into my GPR problem and last night found a with w/green tracer wire along with a piece of green heat shrinked onto the end tucked up under the brown/yellow wires with the end cut off. What is this wire for and what does it do. Should I get it put back on? I have noticed it in a bunch of the pics in other post of GPR's. Thanks Adam 
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04-03-2013, 03:27 PM
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04-03-2013, 04:33 PM
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04-03-2013, 06:09 PM
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04-03-2013, 09:58 PM
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04-04-2013, 05:55 AM
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No check engine lights or anything, never checked the fault codes. I think my edge evolution is supposed to be able to do that, but I've never tried it. I know that PCM is not turning on my GPR and the momentary switch that I put in was only giving me 10v at the GP pole of the relay. Any suggestions?
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04-04-2013, 06:00 AM
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#9
04-04-2013, 11:26 AM
I guess I did have the wiring diagram for this...
Start with drawing 3 and locate the GPR. Then follow the WHT/LT GRN wire with the fusible link to match line 19.
Line 19 picks up on drawing sheet #2 and runs across the page to match line 16.
Line 16 picks up on drawing sheet #1 and runs to pin 8 on the PCM.
I presume the PCM needs to know that the Glow Plugs are NOT hot before it allows the AIH relay to kick in (assuming all other conditions are present for the AIH to come into play).
If this system was OBDII compliant, then the SES would illuminate if the PCM detected a fault with the GP relay since it would be considered an emission control device. In Federal trucks, it might only throw a soft code if anything...
In Excursions and California trucks, problems with the GPCM will throw an SES light from what I've seen.
Start with drawing 3 and locate the GPR. Then follow the WHT/LT GRN wire with the fusible link to match line 19.
Line 19 picks up on drawing sheet #2 and runs across the page to match line 16.
Line 16 picks up on drawing sheet #1 and runs to pin 8 on the PCM.
I presume the PCM needs to know that the Glow Plugs are NOT hot before it allows the AIH relay to kick in (assuming all other conditions are present for the AIH to come into play).
If this system was OBDII compliant, then the SES would illuminate if the PCM detected a fault with the GP relay since it would be considered an emission control device. In Federal trucks, it might only throw a soft code if anything...
In Excursions and California trucks, problems with the GPCM will throw an SES light from what I've seen.
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04-04-2013, 11:31 AM
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#12
04-04-2013, 02:47 PM
Air Intake Heater.
Ford added it to these trucks part way through the 1999 model year along with a few other bits and pieces (mostly larger intake tubes and revised air box).
I think they did this for emissions reasons because adding the AIH most likely allowed the exhaust to meet minimum opacity spec during certain cold start conditions. This in turn MIGHT have allowed Ford to remove the catalytic converter and save a bundle of money in cost on each truck built. All this is just a theory though....I have no real evidence to substantiate any of this at all.
According to the PC/ED manual for the 7.3....the Glow Plugs and AIH can not be energized at the same time. I presume this is for charging system capacity reasons since the AIH draws about 50 amps while the GPs draw about 32 amps (4 amps each).
For sake of comparison, the 4.5 liter V6 Power Stroke DOES use the GP and AIH relays at the same time under many conditions. Again, I presume this is for emissions reasons since the standards became much tighter around 2005. This may be why the 6.0 and newer diesels have higher amp alternators than our 7.3 engines do. Plus there are more 'features' on board the newer trucks so amp draw must be higher than our 'classic' models.
Ford added it to these trucks part way through the 1999 model year along with a few other bits and pieces (mostly larger intake tubes and revised air box).
I think they did this for emissions reasons because adding the AIH most likely allowed the exhaust to meet minimum opacity spec during certain cold start conditions. This in turn MIGHT have allowed Ford to remove the catalytic converter and save a bundle of money in cost on each truck built. All this is just a theory though....I have no real evidence to substantiate any of this at all.
According to the PC/ED manual for the 7.3....the Glow Plugs and AIH can not be energized at the same time. I presume this is for charging system capacity reasons since the AIH draws about 50 amps while the GPs draw about 32 amps (4 amps each).
For sake of comparison, the 4.5 liter V6 Power Stroke DOES use the GP and AIH relays at the same time under many conditions. Again, I presume this is for emissions reasons since the standards became much tighter around 2005. This may be why the 6.0 and newer diesels have higher amp alternators than our 7.3 engines do. Plus there are more 'features' on board the newer trucks so amp draw must be higher than our 'classic' models.
#13
04-04-2013, 03:05 PM
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Air Intake Heater.
Ford added it to these trucks part way through the 1999 model year along with a few other bits and pieces (mostly larger intake tubes and revised air box).
I think they did this for emissions reasons because adding the AIH most likely allowed the exhaust to meet minimum opacity spec during certain cold start conditions. This in turn MIGHT have allowed Ford to remove the catalytic converter and save a bundle of money in cost on each truck built. All this is just a theory though....I have no real evidence to substantiate any of this at all.
According to the PC/ED manual for the 7.3....the Glow Plugs and AIH can not be energized at the same time. I presume this is for charging system capacity reasons since the AIH draws about 50 amps while the GPs draw about 32 amps (4 amps each).
For sake of comparison, the 4.5 liter V6 Power Stroke DOES use the GP and AIH relays at the same time under many conditions. Again, I presume this is for emissions reasons since the standards became much tighter around 2005. This may be why the 6.0 and newer diesels have higher amp alternators than our 7.3 engines do. Plus there are more 'features' on board the newer trucks so amp draw must be higher than our 'classic' models.
Ford added it to these trucks part way through the 1999 model year along with a few other bits and pieces (mostly larger intake tubes and revised air box).
I think they did this for emissions reasons because adding the AIH most likely allowed the exhaust to meet minimum opacity spec during certain cold start conditions. This in turn MIGHT have allowed Ford to remove the catalytic converter and save a bundle of money in cost on each truck built. All this is just a theory though....I have no real evidence to substantiate any of this at all.
According to the PC/ED manual for the 7.3....the Glow Plugs and AIH can not be energized at the same time. I presume this is for charging system capacity reasons since the AIH draws about 50 amps while the GPs draw about 32 amps (4 amps each).
For sake of comparison, the 4.5 liter V6 Power Stroke DOES use the GP and AIH relays at the same time under many conditions. Again, I presume this is for emissions reasons since the standards became much tighter around 2005. This may be why the 6.0 and newer diesels have higher amp alternators than our 7.3 engines do. Plus there are more 'features' on board the newer trucks so amp draw must be higher than our 'classic' models.
#14
04-04-2013, 03:11 PM
The 'woosh' sound might be a blend door closing if you are in the habit of leaving your climate controls on a particular setting. Try putting your controls to off and see if the 'woosh' sound goes away.
#15
04-04-2013, 03:12 PM
I think they did this for emissions reasons because adding the AIH most likely allowed the exhaust to meet minimum opacity spec during certain cold start conditions. This in turn MIGHT have allowed Ford to remove the catalytic converter and save a bundle of money in cost on each truck built. All this is just a theory though....I have no real evidence to substantiate any of this at all.
Stewart