Map sensor & harness
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Road Warrior
Joined: Jun 2014
Posts: 1,297
Likes: 57
From: N. IL
Mpg down 20%
2012 Street glide. Last four or five tank fulls are netting 20% less fuel mileage. Seems to start hard at times as well. It has been suggested to me to change the map sensor as it could be showing early signs of giving up. It is also been stated that the map harness could have a short. I see there's a replacement harness available. Does anyone know the testing procedure to check sensor & harness to verify...
Last edited by jt metal; May 4, 2021 at 10:47 AM.
Stellar HDF Member
Joined: Aug 2020
Posts: 3,159
Likes: 2,202
From: College Station, TX
The symptoms you describe look like it could well be the MAP sensor. Typical symptoms also include stronger than usual gas odor from the exhaust, poor MPG, sluggish throttle response, rough idle and hard starting. And hopefully a check engine light that would set a DTC code indicating the source of the problem.
A failing MAP sensor can be a little difficult to diagnose because the problem can be intermittent making a standard voltage check ineffective. So checking for DTC codes would be my first start. Typical MAP sensor codes are shown below. And, some of those models did have wiring problems, but I'd check the simple things first.
You can check the MAP sensor with a volt meter, but again, if it is intermittent you may not find anything out of range when the throttle is opened. And considering that the price of a MAP sensor is fairly inexpensive, on a 9 year old bike, I'd be tempted to change it if none of the test are conclusive. Aftermarket sensors can be had for $40 or so depending one the brand, and an genuine HD retails for about $98 but can be found online for less.
Sometimes you can pull the sensor out and clean it, which if you haven't done that or cleaned the throttle and intake recently would be something to check. And, if you are still running the breather into the throttle, all of that will get gummed up over time. So even if you end up replacing the MAP sensor, I'd still look closely at the throttle body / plate and clean as needed as a part of your routine maintenance.
Common Trouble Codes for MAP sensor failures
P0106 - MAP Sensor Rate of Range Error (04-06 Carburetor)
P0107 - Map Sensor Failed Open/Low (04-06 Carburetor)
P0107 - Map Sensor Open/Low (EFI)
P0108 - Map Sensor Failed High (04-06 Carburetor)
P0108 - Map Sensor High (EFI)
P0108 can also indicate a failed sensor seal at the manifold.
Paul
A failing MAP sensor can be a little difficult to diagnose because the problem can be intermittent making a standard voltage check ineffective. So checking for DTC codes would be my first start. Typical MAP sensor codes are shown below. And, some of those models did have wiring problems, but I'd check the simple things first.
You can check the MAP sensor with a volt meter, but again, if it is intermittent you may not find anything out of range when the throttle is opened. And considering that the price of a MAP sensor is fairly inexpensive, on a 9 year old bike, I'd be tempted to change it if none of the test are conclusive. Aftermarket sensors can be had for $40 or so depending one the brand, and an genuine HD retails for about $98 but can be found online for less.
Sometimes you can pull the sensor out and clean it, which if you haven't done that or cleaned the throttle and intake recently would be something to check. And, if you are still running the breather into the throttle, all of that will get gummed up over time. So even if you end up replacing the MAP sensor, I'd still look closely at the throttle body / plate and clean as needed as a part of your routine maintenance.
Common Trouble Codes for MAP sensor failures
P0106 - MAP Sensor Rate of Range Error (04-06 Carburetor)
P0107 - Map Sensor Failed Open/Low (04-06 Carburetor)
P0107 - Map Sensor Open/Low (EFI)
P0108 - Map Sensor Failed High (04-06 Carburetor)
P0108 - Map Sensor High (EFI)
P0108 can also indicate a failed sensor seal at the manifold.
Paul
Thread Starter
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Road Warrior
Joined: Jun 2014
Posts: 1,297
Likes: 57
From: N. IL
The symptoms you describe look like it could well be the MAP sensor. Typical symptoms also include stronger than usual gas odor from the exhaust, poor MPG, sluggish throttle response, rough idle and hard starting. And hopefully a check engine light that would set a DTC code indicating the source of the problem.
A failing MAP sensor can be a little difficult to diagnose because the problem can be intermittent making a standard voltage check ineffective. So checking for DTC codes would be my first start. Typical MAP sensor codes are shown below. And, some of those models did have wiring problems, but I'd check the simple things first.
You can check the MAP sensor with a volt meter, but again, if it is intermittent you may not find anything out of range when the throttle is opened. And considering that the price of a MAP sensor is fairly inexpensive, on a 9 year old bike, I'd be tempted to change it if none of the test are conclusive. Aftermarket sensors can be had for $40 or so depending one the brand, and an genuine HD retails for about $98 but can be found online for less.
Sometimes you can pull the sensor out and clean it, which if you haven't done that or cleaned the throttle and intake recently would be something to check. And, if you are still running the breather into the throttle, all of that will get gummed up over time. So even if you end up replacing the MAP sensor, I'd still look closely at the throttle body / plate and clean as needed as a part of your routine maintenance.
Common Trouble Codes for MAP sensor failures
P0106 - MAP Sensor Rate of Range Error (04-06 Carburetor)
P0107 - Map Sensor Failed Open/Low (04-06 Carburetor)
P0107 - Map Sensor Open/Low (EFI)
P0108 - Map Sensor Failed High (04-06 Carburetor)
P0108 - Map Sensor High (EFI)
P0108 can also indicate a failed sensor seal at the manifold.
Paul
A failing MAP sensor can be a little difficult to diagnose because the problem can be intermittent making a standard voltage check ineffective. So checking for DTC codes would be my first start. Typical MAP sensor codes are shown below. And, some of those models did have wiring problems, but I'd check the simple things first.
You can check the MAP sensor with a volt meter, but again, if it is intermittent you may not find anything out of range when the throttle is opened. And considering that the price of a MAP sensor is fairly inexpensive, on a 9 year old bike, I'd be tempted to change it if none of the test are conclusive. Aftermarket sensors can be had for $40 or so depending one the brand, and an genuine HD retails for about $98 but can be found online for less.
Sometimes you can pull the sensor out and clean it, which if you haven't done that or cleaned the throttle and intake recently would be something to check. And, if you are still running the breather into the throttle, all of that will get gummed up over time. So even if you end up replacing the MAP sensor, I'd still look closely at the throttle body / plate and clean as needed as a part of your routine maintenance.
Common Trouble Codes for MAP sensor failures
P0106 - MAP Sensor Rate of Range Error (04-06 Carburetor)
P0107 - Map Sensor Failed Open/Low (04-06 Carburetor)
P0107 - Map Sensor Open/Low (EFI)
P0108 - Map Sensor Failed High (04-06 Carburetor)
P0108 - Map Sensor High (EFI)
P0108 can also indicate a failed sensor seal at the manifold.
Paul
Bike hasn't throw codes, as of yet.
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