P1172 and P1175 codes
#11
I am still fighting these codes. There have been some changes.
A: I found a vacuum leak, and fixed it. Now the truck idles great, and generally runs awesome. However, instead of the codes showing up every third day or so, they not pop up every time I drive it.
B: further Web searching has resulted in utter confusion. It would appear thay there are several "official land rover specific code lists" and they all differ In their definitions, some don't even include a 1175 code on the list.....so what do these codes actually mean?
I just want to know where else I can look for the problem rather than just throwing parts at it.
A: I found a vacuum leak, and fixed it. Now the truck idles great, and generally runs awesome. However, instead of the codes showing up every third day or so, they not pop up every time I drive it.
B: further Web searching has resulted in utter confusion. It would appear thay there are several "official land rover specific code lists" and they all differ In their definitions, some don't even include a 1175 code on the list.....so what do these codes actually mean?
I just want to know where else I can look for the problem rather than just throwing parts at it.
#12
I am still fighting these codes. There have been some changes.
A: I found a vacuum leak, and fixed it. Now the truck idles great, and generally runs awesome. However, instead of the codes showing up every third day or so, they not pop up every time I drive it.
B: further Web searching has resulted in utter confusion. It would appear thay there are several "official land rover specific code lists" and they all differ In their definitions, some don't even include a 1175 code on the list.....so what do these codes actually mean?
I just want to know where else I can look for the problem rather than just throwing parts at it.
A: I found a vacuum leak, and fixed it. Now the truck idles great, and generally runs awesome. However, instead of the codes showing up every third day or so, they not pop up every time I drive it.
B: further Web searching has resulted in utter confusion. It would appear thay there are several "official land rover specific code lists" and they all differ In their definitions, some don't even include a 1175 code on the list.....so what do these codes actually mean?
I just want to know where else I can look for the problem rather than just throwing parts at it.
Per workshop manual the 1172 is "system too rich bank-1" 1175 is for bank-2
LR description: additive injector adaptive fueling, lean limit exceeded on that bank.
This is p. 18-2-35 under Engine Mgmt System
It falls under fuel injectors but being on both banks the issue has to be further upstream with 1 of the sensors, like the Mass Air Flow, perhaps.
Last edited by chubbs878; 01-26-2017 at 09:58 PM.
#13
B: further Web searching has resulted in utter confusion. It would appear thay there are several "official land rover specific code lists" and they all differ In their definitions, some don't even include a 1175 code on the list.....so what do these codes actually mean?
......
#14
Per workshop manual the 1172 is "system too rich bank-1" 1175 is for bank-2
LR description: additive injector adaptive fueling, lean limit exceeded on that bank.
This is p. 18-2-35 under Engine Mgmt System
It falls under fuel injectors but being on both banks the issue has to be further upstream with 1 of the sensors, like the Mass Air Flow, perhaps. Stick another Bosch on there.
LR description: additive injector adaptive fueling, lean limit exceeded on that bank.
This is p. 18-2-35 under Engine Mgmt System
It falls under fuel injectors but being on both banks the issue has to be further upstream with 1 of the sensors, like the Mass Air Flow, perhaps. Stick another Bosch on there.
#16
According to some reading, "additive injector adaptive fueling" is done at idle. Multiplication is done at all engine speeds.
This makes sense as the codes only pup up at idle.
What I don't understand is whether Fuel trim and injector adaptive fueling are the same thing or correlated. For instance, a negative fuel trim means that the computer is pulling fuel to adjust for a rich condition. So by these definitions, does "rich limit exceeded" mean that the computer has told the injectors to shorten their pulse widths as much as it possibly can bit the o2's are still reporting a rich condition? Or that the computer has cranked the injectors on to the max, and as a result has over compensated and caused the rich condition?
is short term fuel trim the same thing as additive injector adaptation? Two names for the same data?
P.s. yes I double posted. Damn smart phone moves seamlessly from thread to thread and makes it easy to post in the wrong place
This makes sense as the codes only pup up at idle.
What I don't understand is whether Fuel trim and injector adaptive fueling are the same thing or correlated. For instance, a negative fuel trim means that the computer is pulling fuel to adjust for a rich condition. So by these definitions, does "rich limit exceeded" mean that the computer has told the injectors to shorten their pulse widths as much as it possibly can bit the o2's are still reporting a rich condition? Or that the computer has cranked the injectors on to the max, and as a result has over compensated and caused the rich condition?
is short term fuel trim the same thing as additive injector adaptation? Two names for the same data?
P.s. yes I double posted. Damn smart phone moves seamlessly from thread to thread and makes it easy to post in the wrong place
#17
Just wanted to follow up on this for the sake of posterity.
After installing a known good Bosch MAF and walker O2 sensors, I've been code free (fingers crossed) for some time now.
I believe the bosch O2's were the problem. My fuel trims were consistently positive 1.0-4.0% ish and now they are completely opposite, same range but on the negative side. So a component was reporting incorrectly and causing the computer to compensate in the wrong direction.
I believe it was the O2's specifically because one started acting sluggish and lead into an O2 wiring fiasco, but at least one O2 was definitely bad and had probably been reporting innacurately for some time, but not far enough out of spec to throw an unresponsive code until recently.
The cheap rebuilt MAF could have been playing a part in the issue as well but I was code free prior to doing head gaskets and am not convinced that sensors just go bad of their own Accord (even remanufactured ones) without some kind of stimulus, I.e water intrusion, voltage spike, blunt force trauma, etc.
After installing a known good Bosch MAF and walker O2 sensors, I've been code free (fingers crossed) for some time now.
I believe the bosch O2's were the problem. My fuel trims were consistently positive 1.0-4.0% ish and now they are completely opposite, same range but on the negative side. So a component was reporting incorrectly and causing the computer to compensate in the wrong direction.
I believe it was the O2's specifically because one started acting sluggish and lead into an O2 wiring fiasco, but at least one O2 was definitely bad and had probably been reporting innacurately for some time, but not far enough out of spec to throw an unresponsive code until recently.
The cheap rebuilt MAF could have been playing a part in the issue as well but I was code free prior to doing head gaskets and am not convinced that sensors just go bad of their own Accord (even remanufactured ones) without some kind of stimulus, I.e water intrusion, voltage spike, blunt force trauma, etc.
#18
Use
http://enginecodemaster.com
Any little bit of antifreeze on an O2 ruins it.
Engine Code: P1172
Land Rover Engine Code: P1172 = Rich Fueling Fault
Click to Process more Land Rover Engine Codes here
http://enginecodemaster.com
Any little bit of antifreeze on an O2 ruins it.
Engine Code: P1172
Land Rover Engine Code: P1172 = Rich Fueling Fault
Click to Process more Land Rover Engine Codes here
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savageracer2008
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05-18-2011 07:15 AM