Traction Control

[rebells6]

My cars system is flashing 'Service Vehicle Soon' 'Service Traction Control'. Does anyone know what this could be? I called my service advisor and usually he would run a check for me for free but he said on a Corvette they have to run a series of test so he would have to charge me the $85 fee. I am just looking for a few ideas as to what it could be before I run in there and pay $85 for nothing. I think I remember seeing someone say that I can pull the #16 and #23 fuse and it will reset the computer. I have thought about doing that and seeing what will happen. I am in Memphis, so if anyone is near me and has a ScanTool that would be awsome! Thanks guys!

[bigbadbevo]

You can check the codes w/o a scanner tool.

http://www.z06vette.com/ipc.txt

[rebells6]

Sweet! Thanks that will be a big help.

Ive only been here a week or so and I swear the members on here have been the most positive and helpful. I will be at the next Z06fest next year.

[Speedratchet]

My car is doing the same thing. The code C1214 is coming up and cannot be cleared. I'm taking it to the dealer tomorrow to have it fixed under warranty. I'll let you know what they find.

[Speedratchet]

Originally Posted by Speedratchet

My car is doing the same thing. The code C1214 is coming up and cannot be cleared. I'm taking it to the dealer tomorrow to have it fixed under warranty. I'll let you know what they find.

Update: I just got my car back and the EBCM was bad and had to be replaced. It was still under warranty, but the price quote for just the module was $742.00. With only four more weeks of warranty left I was happy it went out when it did. The only bad part was the mechanic left light scratches on my R/F fender. I was able to rub them out, but it pisses me off that I even had to.

[rebells6]

I can't remember what code mine is throwing. It isn't the same one as yours. I will post up in a little while what code it is. All the codes in the TCS section are in the History, does not say they are current.

[GR8 WHITE]

I sthis the same as "Service Vehicle Soon" light when it is coupled with the traction control issue?

[Speedratchet]

Originally Posted by rebells6

I can't remember what code mine is throwing. It isn't the same one as yours. I will post up in a little while what code it is. All the codes in the TCS section are in the History, does not say they are current.

I also had the C1293, which has to do with brake fluid pressure.

[rebells6]

Originally Posted by GR8 WHITE

I sthis the same as "Service Vehicle Soon" light when it is coupled with the traction control issue?

Mine, yes. It comes up 'Service Vehicle Soon' and 'Service Active Handling' and the Traction Control Light comes on.

[rebells6]

The codes that mine is throwing up for the TCS is C1287 and C1288, both have an 'H' behind it meaning it is in the history and not current, am I correct? Anybody have info on those two codes?

[rebells6]

See that is what I am confused about, the are history codes. Whenever the car throws up the "SVS" light, I check it and the same codes come up. Wouldn't it throw a new code that is current?

[Speedratchet]

Circuit Description
The Vehicle Stability Enhancement System (VSES) is activated by the EBCM calculating the desired yaw rate and comparing it to the actual yaw rate input. The desired yaw rate is calculated from measured steering wheel position, vehicle speed, and lateral acceleration. The difference between the desired yaw rate and actual yaw rate is the yaw rate error, which is a measurement of oversteer or understeer. If the yaw rate error becomes too large, the EBCM will attempt to correct the vehicle's yaw motion by applying differential braking to the left or right front wheel.

The amount of differential braking applied to the left or right front wheel is based on both the yaw rate error and side slip rate error. The side slip rate error is a function of the lateral acceleration minus the product of the yaw rate and vehicle speed. The yaw rate error and side slip rate error are combined to produce the total delta velocity error. When the delta velocity error becomes too large and the VSES system
activates, the driver's steering inputs combined with the differential braking will attempt to bring the delta velocity error toward zero. The VSES activations generally occur during aggressive driving, in the turns or bumpy roads without much use of the accelerator pedal. When braking during VSES activation, the brake pedal will feel different than the ABS pedal pulsation. The brake pedal pulsates at a higher
frequency during VSES activation.

The usable output voltage range for the lateral accelerometer and yaw rate sensors is 0.25 - 4.75 volts. The scan tool will report zero lateral acceleration or yaw rate as 2.5 volts with no sensor bias present. The sensor bias compensates for sensor mounting alignment errors, electronic signal errors, temperature changes, and manufacturing differences.
The steering wheel position sensor supplies 2 analog inputs, Phase A and Phase B, to the EBCM. The 2 input signals are approximately 90 degrees out of phase. By interpreting the relationship between the 2 inputs, the EBCM can determine the position of the steering wheel and the direction of steering wheel rotation.

Steer angle centering is the process by which the EBCM calibrates the steering sensor output so that the output reads zero when the steering wheel is centered. Using the yaw rate input, lateral accelerometer input, and wheel speed sensor inputs, the initial steering center position is
calculated after driving greater than 10 km/h (6 mph) for more than 10 seconds in a straight line on a level surface.

Conditions for Running the DTC
The ignition is ON.

Conditions for Setting the DTC

C1287

One of the following conditions exists:
- The steering wheel position sensor is synchronized and the steer rate (speed that the steering wheel appears to be turning) is greater than 1100
degrees/second.
- The steer rate is less than 80 degrees/second and the difference in the phase angle between Phase A and Phase B is greater than 20
Degrees
- The 2 steering sensor signals (Phase A and Phase B) do not agree for 1 second. Under this condition, this DTC will set along with DTC C1281.

C1288

One of the following conditions exists:
- Both Phase A and Phase B are greater than 4.9 volts for 1.6 seconds.
- Both Phase A and Phase B are less than 0.2 volts for 1.6 seconds.
- The difference in the changes in Phase A and Phase B is greater than 35.2 degrees for 9.76 milliseconds.

Action Taken When the DTC Sets
- The EBCM disables the VSES for the duration of the ignition cycle.
- The Traction Control and Active Handling indicator turns ON.
- The DIC displays the Service Active Handling message.
- The ABS/TCS remains functional.
Conditions for Clearing the DTC
- The condition for the DTC is no longer present (the DTC is not current) and you used the scan tool Clear DTC function.
- The condition for the DTC is no longer present (the DTC is not current) and you used the On-Board Diagnostics Clear DTC function.
- The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

- The scan tool may display 2 additional characters after the DTC. Take note of the 2 character code and any other DTCs that are set. The 2 character code is an engineering aid used in order to determine the specific criteria which caused the DTC to set.
- During diagnosis, park the vehicle on a level surface.
- Check the vehicle for proper alignment. The car should not pull in either direction while driving straight on a level surface.
- Find out from the driver under what conditions the DTC was set (when the DIG displayed the Service Active Handling message). This information will help to duplicate the failure.
- The Snapshot function on the scan tool can help find an intermittent DTC.

Test Description

The numbers below refer to the step numbers on the diagnostic table.
2. Perform the Steering Position Sensor Test in order to verify if the Steering Wheel Position Sensor (SWPS) is operating properly.
3. Tests for the proper operation of the steering wheel position signal A circuit in the low voltage range.
4. Tests for the proper operation of the steering wheel position signal B circuit in the low voltage range.
5. Tests for the proper operation of the steering wheel position signal A circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.
6. Tests for the proper operation of the steering wheel position signal B circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.
7. Tests for a short to voltage in the 5 volt reference circuit.
8. Tests for a high resistance or an open in the low reference circuit.

[ZO6 AL-X]

Good! You wrote out exactly what I was going to say.

Thanks,

Alex

[rebells6]

So from what I am gathering, since I have lowered the car, that could be helping to throw the code. I lowered the car and have not gotten an alignment, will be within the next week. After it gets an alignment everything should be ok?