engine temp sensor
Former Sponsor
Joined: Jan 2009
Posts: 19,364
Likes: 40
From: Los Angeles, CA
It senses the temp of the engine. LOL. It is in one of the heads (I can't remember which right now) and unscrews. I have no idea if you can get it out without head removal but i would imagine you could. It should be on the left side of the bike kind of behind the horn if I remember correctly on my 4 hours of sleep. LOL. I hope this helps.
Drew
Drew
Road Warrior
Joined: May 2009
Posts: 1,493
Likes: 94
From: Belgium
Simply put, the ECM needs this info to calculate the amount of fuel needed to inject into the engine.
When your engine is cold the ECM injects a bit more fuel (like having a choke) and then adjusts until the engine is up to temperature.
Looked it up in the 2007 service manaual and for the 07 bikes it's not that difficult to replace the sensor ... don't know if it is in the same position in the 04 bikes ... it's where Drew says it's supposed to be, on the back of the front cylincer and you can unscrew it after you take of the horn.
sensor part number is 32446-99, they cost around $40
You also have a sensor that checks the temperature of the air intake. That one a bit more complicated to replace ...
When your engine is cold the ECM injects a bit more fuel (like having a choke) and then adjusts until the engine is up to temperature.
Looked it up in the 2007 service manaual and for the 07 bikes it's not that difficult to replace the sensor ... don't know if it is in the same position in the 04 bikes ... it's where Drew says it's supposed to be, on the back of the front cylincer and you can unscrew it after you take of the horn.
sensor part number is 32446-99, they cost around $40
You also have a sensor that checks the temperature of the air intake. That one a bit more complicated to replace ...
Last edited by Rakthi; Apr 3, 2011 at 10:04 AM.
Account Closed
Joined: Oct 2009
Posts: 682
Likes: 1
From: In the World
Simply put, the ECM needs this info to calculate the amount of fuel needed to inject into the engine.
When your engine is cold the ECM injects a bit more fuel (like having a choke) and then adjusts until the engine is up to temperature.
Looked it up in the 2007 service manaual and for the 07 bikes it's not that difficult to replace the sensor ... don't know if it is in the same position in the 04 bikes ... it's where Drew says it's supposed to be, on the back of the front cylincer and you can unscrew it after you take of the horn.
sensor part number is 32446-99, they cost around $40
You also have a sensor that checks the temperature of the air intake. That one a bit more complicated to replace ...
When your engine is cold the ECM injects a bit more fuel (like having a choke) and then adjusts until the engine is up to temperature.
Looked it up in the 2007 service manaual and for the 07 bikes it's not that difficult to replace the sensor ... don't know if it is in the same position in the 04 bikes ... it's where Drew says it's supposed to be, on the back of the front cylincer and you can unscrew it after you take of the horn.
sensor part number is 32446-99, they cost around $40
You also have a sensor that checks the temperature of the air intake. That one a bit more complicated to replace ...
Cruiser
Joined: Sep 2005
Posts: 139
Likes: 0
From: Phoenix, AZ
3-400 dollars for this is beyond ridiculous. It us a $30 part and a 5 minute replacement. You can get to it without removing anything. You'll just need a deep thin walled socket.
What a bunch of thieves.
What a bunch of thieves.
Road Captain
Joined: Mar 2009
Posts: 570
Likes: 2
i've read that if the engine temp reaches some threshold the ecm sends pulses to only one injector in an attempt to lower temps...i would advise to check for codes yourself, if some come up write'em down and clear'em, go for a ride a see if the engine light turns on again, if it does check codes again to see if they are the same...you'll find info here and the net on dtc's...hopefully you won't have to spend hundreds to replace a sensor...if used the attached steps to retrieve dtc's on my '07, might work in yours...
have you noticed any symptoms?
have you noticed any symptoms?
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Stage IV
Joined: Mar 2010
Posts: 4
Likes: 3
I know I'm late to this thread, but I just experienced this problem on my fuel injected '04 Heritage. The symptoms were similar to bad gas; stalling when first starting and running really rough after warming up and the check engine light illuminated. As another posted, it's just a $40 dollar part. On my bike, it is on the left side of the bike behind the horn. The engine code for this problem is PO118. To look for the code, with the bike off, turn the Off/Run switch to run, hold in the odometer button and turn the switch to Ignition. You will see the speedometer sweep and then a message saying "Diag." Release the odometer button and press it once quickly. You will see a code flashing, click the odometer button once again quickly and the trouble code, if any, will appear.
If it's the engine temperature sensor, it is easy to replace and takes about 15 minutes. You'll need a deep 3/4" socket for the sensor and a 1/2" socket to remove the horn. Remove the horn and carefully let it dangle, if you don't want to unplug it. Next, pull up the boot covering the sensor wiring. (The sensor is screwed into the block) Unplugged the wiring carefully by gently rocking it back and forth while pulling. Then put your 3/4" socket over the sensor, then put the socket wrench on the socket. It's a tight fit. Once you have it loose, remove the wrench and socket and finish unscrewing by hand. Install the new sensor by hand being careful not to cross-thread the brass fitting. Then finish with the wrench and put it all back together in the reverse order of how you removed it. You can clear the code by holding the odometer button while the code is being displayed.
If it's the engine temperature sensor, it is easy to replace and takes about 15 minutes. You'll need a deep 3/4" socket for the sensor and a 1/2" socket to remove the horn. Remove the horn and carefully let it dangle, if you don't want to unplug it. Next, pull up the boot covering the sensor wiring. (The sensor is screwed into the block) Unplugged the wiring carefully by gently rocking it back and forth while pulling. Then put your 3/4" socket over the sensor, then put the socket wrench on the socket. It's a tight fit. Once you have it loose, remove the wrench and socket and finish unscrewing by hand. Install the new sensor by hand being careful not to cross-thread the brass fitting. Then finish with the wrench and put it all back together in the reverse order of how you removed it. You can clear the code by holding the odometer button while the code is being displayed.
Road Captain
Joined: Mar 2013
Posts: 530
Likes: 57
From: The South
I know I'm late to this thread, but I just experienced this problem on my fuel injected '04 Heritage. The symptoms were similar to bad gas; stalling when first starting and running really rough after warming up and the check engine light illuminated. As another posted, it's just a $40 dollar part. On my bike, it is on the left side of the bike behind the horn. The engine code for this problem is PO118. To look for the code, with the bike off, turn the Off/Run switch to run, hold in the odometer button and turn the switch to Ignition. You will see the speedometer sweep and then a message saying "Diag." Release the odometer button and press it once quickly. You will see a code flashing, click the odometer button once again quickly and the trouble code, if any, will appear.
If it's the engine temperature sensor, it is easy to replace and takes about 15 minutes. You'll need a deep 3/4" socket for the sensor and a 1/2" socket to remove the horn. Remove the horn and carefully let it dangle, if you don't want to unplug it. Next, pull up the boot covering the sensor wiring. (The sensor is screwed into the block) Unplugged the wiring carefully by gently rocking it back and forth while pulling. Then put your 3/4" socket over the sensor, then put the socket wrench on the socket. It's a tight fit. Once you have it loose, remove the wrench and socket and finish unscrewing by hand. Install the new sensor by hand being careful not to cross-thread the brass fitting. Then finish with the wrench and put it all back together in the reverse order of how you removed it. You can clear the code by holding the odometer button while the code is being displayed.
If it's the engine temperature sensor, it is easy to replace and takes about 15 minutes. You'll need a deep 3/4" socket for the sensor and a 1/2" socket to remove the horn. Remove the horn and carefully let it dangle, if you don't want to unplug it. Next, pull up the boot covering the sensor wiring. (The sensor is screwed into the block) Unplugged the wiring carefully by gently rocking it back and forth while pulling. Then put your 3/4" socket over the sensor, then put the socket wrench on the socket. It's a tight fit. Once you have it loose, remove the wrench and socket and finish unscrewing by hand. Install the new sensor by hand being careful not to cross-thread the brass fitting. Then finish with the wrench and put it all back together in the reverse order of how you removed it. You can clear the code by holding the odometer button while the code is being displayed.