Speedo not working right after WP install
- Thread starter serg92
- Start date
08mastiff
Active Member
Mine is doing the same thing. In addition to that mine is not registering miles accurately. For instance I went five miles and it showed .8 miles. Trip odometer messed up also. I just ordered a Dakota digital on amazon $247 delivered. I could be wrong but it may be time for a new speedometer. Try cleaning the transmission sensor that registers the speed and mileage first. I did it but still screwed up.
bearman
Active Member
The following is an excerpt from the 2007 service manual.
Personally, I wouldn't do the field calibration unless the pulse count displayed was pretty far off from stock. But there is some useful info in it.
SPEEDOMETER
A pulse count value is displayed when the speedometer is powered up. The speedometer has factory calibration and will display around 49440 pulses.
Pulses for the speedometer are received from the speedometer sensor located on the top, right rear side of the transmission. The speedometer converts these pulse counts to a mph based on calibration and displays that speed on the speedometer face.
The speedometer and speedometer sensor both receive their power from the EHC. However the signal is a straight through circuit and is not affected or conditioned by the EHC.
If the speedometer or speedometer sensor is losing power, this is possibly an EHC or harness failure. If the speedometer has power but no signal, the problem lies in the wiring, speedometer or speedometer sensor and not the EHC.
When the ignition switch is turned on, the speedometer performs a self-test that lasts about a second. The speedometer needle will go up to the 50-60 mph mark and a then back to zero.
If the ignition key is turned Off and then immediately turned on again, the self-test will only consist of the needle going below zero and then back up lo zero. At the same time, a six digit number appears in the odometer window for three seconds. This number is the pulse count that is programmed into the speedometer. The number cannot be changed unless a field calibration is performed.
After the pulse count value has been displayed, the number changes to the hour meter mode and will be displayed for three seconds.
The speedometer display will remain in either odometer or trip mode until changed by pushing the button on the face of the speedometer. The trip meter reads in 1/10th miles and the odometer reads in whole numbers.
TRIP METER
Pushing the button on the face of the speedometer toggles the display between odometer and trip meter readings.
To reset the trip meter read1ng 10 zero, depress and hold the button on the face of the speedometer until the display reads zero.
When resetting the trip reading, it does not matter if the speedometer is in the odometer mode or the trip mode. When the button is depressed and held down, the display automatically changes to the trip mode and then it will reset to zero.
CALIBRATION NOTES
1. Tires will slightly increase in diameter as vehicle speed increases. To minimize this error, ride at an average speed during calibration (Approximately 45 mph for most vehicles).
2. Tires slightly increase in diameter as air pressure is increased. To minimize this error, check the tire to ensure correct air pressure.
3. Tire slippage. Minimize this error by not breaking traction.
4. Always recalibrate speedometer after any tire SIZE change, or gear ratio change.
5. Speedometer accuracy depends on the accuracy of the measured two mile distance.
The speedometer calibration is based upon the number of pulses that the speedometer sensor generates in a two mile distance. This value is dependent on several factors such as tire size, front and rear pulley size, sensor gear in transmission and final drive ratios in the transmission.
The pulse count is set at the factory and cannot be changed unless a field calibration is performed. The pulse count displayed on speedometer at power-up is a one-mile pulse count.
FIELD CALIBRATION
To field calibrate a speedometer, the motorcycle must be ridden for 2 miles. If the distance is not exactly two miles, then the calibration will be off. Choose a distance as accurate to 2 miles as possible.
Results of a field calibration may not yield a pulse count as shown above. Since the field calibration actually matches the speedometer to the motorcycle, a value other than shown above is acceptable provided the following steps were followed as closely as possible.
1. Take the motorcycle to the starting point of the two-mile distance to be used for calibration and shut the motorcycle off. Make sure the key switch is in the Off position.
2. To set the speedometer onto calibration mode, press and hold the trip/reset button. While holding the button, tum the key to the On position. Continue to hold the trip/reset button until the pointer moves to full scale. (pegged at 120)
3. Release the trip/reset button.
4. Press the trip/reset button. The pointer will move to half scale (straight up). The speedometer is ready to be calibrated.
5. Drive the two-mile distance and stop. The speedometer odometer tracks pulse counts over the two-mile range. The accumulated pulse count is about 98880.
6. Again press and release the trip/reset button. This will display 1/2 the accumulated pulse counts from step 5 (around 49440). The speedometer then exits the calibration mode and the pointer returns to zero to complete the calibration.
Personally, I wouldn't do the field calibration unless the pulse count displayed was pretty far off from stock. But there is some useful info in it.
SPEEDOMETER
A pulse count value is displayed when the speedometer is powered up. The speedometer has factory calibration and will display around 49440 pulses.
Pulses for the speedometer are received from the speedometer sensor located on the top, right rear side of the transmission. The speedometer converts these pulse counts to a mph based on calibration and displays that speed on the speedometer face.
The speedometer and speedometer sensor both receive their power from the EHC. However the signal is a straight through circuit and is not affected or conditioned by the EHC.
If the speedometer or speedometer sensor is losing power, this is possibly an EHC or harness failure. If the speedometer has power but no signal, the problem lies in the wiring, speedometer or speedometer sensor and not the EHC.
When the ignition switch is turned on, the speedometer performs a self-test that lasts about a second. The speedometer needle will go up to the 50-60 mph mark and a then back to zero.
If the ignition key is turned Off and then immediately turned on again, the self-test will only consist of the needle going below zero and then back up lo zero. At the same time, a six digit number appears in the odometer window for three seconds. This number is the pulse count that is programmed into the speedometer. The number cannot be changed unless a field calibration is performed.
After the pulse count value has been displayed, the number changes to the hour meter mode and will be displayed for three seconds.
The speedometer display will remain in either odometer or trip mode until changed by pushing the button on the face of the speedometer. The trip meter reads in 1/10th miles and the odometer reads in whole numbers.
TRIP METER
Pushing the button on the face of the speedometer toggles the display between odometer and trip meter readings.
To reset the trip meter read1ng 10 zero, depress and hold the button on the face of the speedometer until the display reads zero.
When resetting the trip reading, it does not matter if the speedometer is in the odometer mode or the trip mode. When the button is depressed and held down, the display automatically changes to the trip mode and then it will reset to zero.
CALIBRATION NOTES
1. Tires will slightly increase in diameter as vehicle speed increases. To minimize this error, ride at an average speed during calibration (Approximately 45 mph for most vehicles).
2. Tires slightly increase in diameter as air pressure is increased. To minimize this error, check the tire to ensure correct air pressure.
3. Tire slippage. Minimize this error by not breaking traction.
4. Always recalibrate speedometer after any tire SIZE change, or gear ratio change.
5. Speedometer accuracy depends on the accuracy of the measured two mile distance.
The speedometer calibration is based upon the number of pulses that the speedometer sensor generates in a two mile distance. This value is dependent on several factors such as tire size, front and rear pulley size, sensor gear in transmission and final drive ratios in the transmission.
The pulse count is set at the factory and cannot be changed unless a field calibration is performed. The pulse count displayed on speedometer at power-up is a one-mile pulse count.
FIELD CALIBRATION
To field calibrate a speedometer, the motorcycle must be ridden for 2 miles. If the distance is not exactly two miles, then the calibration will be off. Choose a distance as accurate to 2 miles as possible.
Results of a field calibration may not yield a pulse count as shown above. Since the field calibration actually matches the speedometer to the motorcycle, a value other than shown above is acceptable provided the following steps were followed as closely as possible.
1. Take the motorcycle to the starting point of the two-mile distance to be used for calibration and shut the motorcycle off. Make sure the key switch is in the Off position.
2. To set the speedometer onto calibration mode, press and hold the trip/reset button. While holding the button, tum the key to the On position. Continue to hold the trip/reset button until the pointer moves to full scale. (pegged at 120)
3. Release the trip/reset button.
4. Press the trip/reset button. The pointer will move to half scale (straight up). The speedometer is ready to be calibrated.
5. Drive the two-mile distance and stop. The speedometer odometer tracks pulse counts over the two-mile range. The accumulated pulse count is about 98880.
6. Again press and release the trip/reset button. This will display 1/2 the accumulated pulse counts from step 5 (around 49440). The speedometer then exits the calibration mode and the pointer returns to zero to complete the calibration.