P0715 Input Speed Sensor

The next photo shows the 2 bolts holding the cable shifter in place. We need to remove these 2 bolts to gain access to the area where the input speed sensor is located. Once the bolts are removed just move the cable assembly out of the way. The red arrows point to the 2 bolts.

The next photo shows the new sensor in place. I

had to dig out the caked in sand around the housing and blow it out with compressed air so that it was a clean area to work with.

The red arrow points to the single 10 mm mounting bolt.

In my case, the old unit must have been leaking as there was oil in the connector/boot assembly.

Reconnect your cable and reassembly everything. I took the car for a test run and did not see any further issues. I hope these instructions and photos were helpful to someone else beside me. 

The car has about 240,000 kms on it.

Cheers...

Input Speed Sensor P0715 Take apart

Here's what you have to do:

You have to remove the battery in order to gain access to the 3rd mounting bolt that holds the air filter in place. See the photo, the red arrow points to the bolt. It is 10 mm. The thick red cable is the positive wire going to the fuse box from the battery.

The second photo shows the front bolt holding the air filter housing in place.

The third photo shows the remaining bolt that must be removed.

Once all the bolts are removed, you can wiggle out the air filter housing and detach it from the incoming tube.

The following photo shows the output speed sensor, you can ignore this as we are replacing the input speed sensor.

See the next post on this take apart.

P0715 Error Code

This problem started off as an intermittent problem. I was working late one night during the winter months and it was time to head for home. I locked up the shop and got in the car and started it up. It was cold, as I remember, it was -22 degrees C. I usually don't let the car warm up, I backed up and then moved forward about 20 feet coming out of the alley and then it happened. I had no life in the transmission. Shifting through all the gears resulted in nothing. There I sat, no hint of moving.

Well, I had a 40 minute drive ahead of me and I wasn't going anywhere. So I sat there for a few minutes and as the car warmed up the transmission began to work. I had no problems all the way home for which I was thankful. This only happened the one time and I checked all the fluids and all was okay.

Then one day, a few months later, it happened again and a few days later the car shifted into 3rd gear and stayed there. This time the check engine light came on. So I connected my code reader and read the code, which was a P0715. I did some research and found that it was related to the input speed sensor from the transmission.

By now it was spring time and this problem was not too bad at this time. I continued to drive the car as the problem would go away when ever I turned off the ignition and restart the car.

As the days went on, I tried to determine if there was a pattern and there appeared to be one. Also, as time went on the problem became more frequent and I was able to see a pattern to all of this.

Here's what was happening to me. I have a 40 minute drive to work on way. In the morning I would start the car and head to the office. About 5 minutes into the drive, the car would hard shift into 3rd gear and stay there. The check engine light would come on and stay on. I would run this way for a few minutes, put the car into neutral, turn the ignition off and then start the car again, all while doing 80-100 km/hr on the highway.

After re-starting the car, I would shift in to drive and the transmission would shift into 4th gear and transmission would be good the rest of the way into work. Even in the city, the car behaved properly. This whole procedure would repeat itself when it came time to head for home.

I lived with this for the summer months, as it appeared that once the car was warm the transmission behaved itself. The interior heat in the car did not appear to change the symptom, so I felt that it probably was not the in board computer. The TCM (Transmission Computer Module) was part of the main computer and I was hoping that it was not that.

I phoned some of the local wreckers looking for the input and output sensor as well as the computer module but there none to be found. So I checked with my local Hyundai dealer and got a price of 215.00 with the gst included.

Since winter was around the corner, I decided to take the plunge and order this part. It took several weeks for it to show up. On the weekend, I decided to tackle the job. See my next post.