Tps low/open
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Stage III
Joined: Apr 2018
Posts: 3
Likes: 0
From: Cali
Tps low/open
im new to the forum and new to Harley's, got a 2013 sportster 1200 custom fuel injected. It's throwing a check engine code tps low/open if I remember correctly. I replaced the tps didn't fix it, can't find much info online apparently some Harley's have a idle stop screw which can change the resistance in the tps? I bought a cheep online service manual, doesn't mention idle stop screw. It doesn't have much info just how to remove and install parts. Could my idle control module be bad? Is there a way to test it? Could it be my power commander? I don't want to throw parts at it. I hope somebody has fixed the same problem and shed light on my situation. Thanks
Road Warrior
Joined: Jul 2013
Posts: 1,649
Likes: 443
From: Indianapolis
DTC P0122
• At idle (closed throttle), the signal is typically in the range
of 0.2-0.8V.
• At wide open throttle, the signal is normally 4.0-4.9V.
You should be able see the voltage with your Power Vision gauges.
Vehicle Advanced signals
Throttle Position Sensor - shows the voltage.
Throttle Position will only show the throttle percentage 0-100%
Any other codes?
The TMAP and TPS are both connected to the same reference line (+5V REF).
If the line goes to ground or open, multiple trouble codes will be set (DTCs P0107, P0108 and P0122, P0123, P1501 or P1502). Start with the DTC having the lowest
ranking value.
Poor connection:
Check the connector to the TPS for bent /backed out pins or corrosion.
There is another wiring harness connector between the TPS / TMAP and the ECU connector, check it for bent / backed out pins.
Inspect ECM harness connector Pin 24 is the TPS connector.
for backed out terminals, improper mating, inoperative
locks, improperly formed or damaged terminals, poor terminal-
to-wire connection and damaged harness.
Wiring diagram from HD-
https://serviceinfo.harley-davidson....cle/lookupForm
Search for 2013 Sportster - choose wiring diagrams on left hand side then 2013 Wiring Diagrams
• At idle (closed throttle), the signal is typically in the range
of 0.2-0.8V.
• At wide open throttle, the signal is normally 4.0-4.9V.
You should be able see the voltage with your Power Vision gauges.
Vehicle Advanced signals
Throttle Position Sensor - shows the voltage.
Throttle Position will only show the throttle percentage 0-100%
Any other codes?
The TMAP and TPS are both connected to the same reference line (+5V REF).
If the line goes to ground or open, multiple trouble codes will be set (DTCs P0107, P0108 and P0122, P0123, P1501 or P1502). Start with the DTC having the lowest
ranking value.
Poor connection:
Check the connector to the TPS for bent /backed out pins or corrosion.
There is another wiring harness connector between the TPS / TMAP and the ECU connector, check it for bent / backed out pins.
Inspect ECM harness connector Pin 24 is the TPS connector.
for backed out terminals, improper mating, inoperative
locks, improperly formed or damaged terminals, poor terminal-
to-wire connection and damaged harness.
Wiring diagram from HD-
https://serviceinfo.harley-davidson....cle/lookupForm
Search for 2013 Sportster - choose wiring diagrams on left hand side then 2013 Wiring Diagrams
Last edited by shanneba; Apr 29, 2018 at 08:26 PM.
Thread Starter
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Stage III
Joined: Apr 2018
Posts: 3
Likes: 0
From: Cali
Thanks for the replies, the only other code is turn signal ground short because my back right turn signal broke off, but I don't think that is related to the tps. I've been too busy to work on my bike lately. The connection to the the tps is good going to check other connections soon
Thread Starter
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Stage III
Joined: Apr 2018
Posts: 3
Likes: 0
From: Cali
The problem was a bad ecm. I took my bike to a harley dealership and paid them $140 to reprogram my power commander and they told me they wanted another $120 just to take it off to find what's wrong with it so I took it home pulled the power commander of it barley ran and threw 3 codes all relating to the engine overheating even tho it was cold. I don't normally like to throw parts at broken vehicals but I picked up a cheap used ecm and once I did the ecm learning process I was so happy to have my bike running good again. I am so confused on how the tps going bad caused the ecm to go bad or maybe it was vise versa but I hope this helps anyone with a similar problem.
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