C0196

DTC C0196

Circuit Description

The vehicle stability enhancement system (VSES) is activated by the electronic brake control module (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 wheels.

To correct for oversteer, differential braking is used on the left front or right front wheel brake. To correct for understeer, differential braking is used on the left rear or right rear wheel brake.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0196 Yaw Rate Circuit

Conditions for Running the DTC

* The ignition is ON.
* The vehicle speed is greater than 40 km/h (25 mph).

Conditions for Setting the DTC

The EBCM performs different tests to detect a DTC condition. A malfunction is detected when the yaw rate sensor signal input voltage is less than 0.225 volt or greater than 4.775 volts for more than 100 milliseconds.

Action Taken When the DTC Sets

If equipped, the following actions occur:

* The EBCM disables the traction control system (TCS)/VSES for the duration of the ignition cycle.
* A malfunction DTC is set.
* The antilock brake system (ABS) indicator turns ON.
* The Stability Off indicator turns ON.

Conditions for Clearing the DTC

* Using a scan tool
* The DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

Diagnostic Aids

The following conditions may cause a malfunction:

* An open in the yaw rate signal circuit
* A short to ground in the yaw rate signal circuit
* A short to voltage in the yaw rate signal circuit
* An open in the yaw rate ground circuit
* An open in ignition voltage circuit
* A malfunctioning vehicle yaw/lateral accelerometer sensor
* A malfunctioning EBCM

Test Description

The numbers below refer to the step numbers on the diagnostic table.

2. This step tests for specified voltage on the yaw rate signal circuit.
3. This step checks the voltage between the ignition and ground circuit for a specified value.
4. This step checks the voltage between the ignition and ground circuit for a specified value.
5. This step checks to see if the voltage was above the specified voltage.
6. This step checks to see if the voltage was below the specified voltage.
7. This step checks to see if the EBCM 5-volt reference signal is within the specified limit.
8. This step checks to see if the voltage was above the specified voltage.
9. This step checks to see if the resistance of the ground circuit is less than 5 ohms.
10. This step tests for a short to voltage on the 5-volt reference circuit.
11. This step tests for a short to ground, a high resistance, or an open in the 5-volt reference circuit.
12. This step tests for a short to voltage in the yaw rate signal circuit.
13. This step tests for a short to ground, a high resistance, or an open in the yaw rate signal circuit.
14. This step tests for a high resistance or an open in the ground circuit.
15. This step checks the EBCM connector for poor connections.
16. This step checks the yaw/lateral accelerometer sensor connector for poor connections.

Step 1 - Step 11:

Step 12 - Step 19: