The longitudinal sensor is self calibrated for temperature changes. If the calibration bias exceeds 0.5 g, the DTC is set.
Action Taken When the DTC Sets
- The traction control system (TCS) is degraded.
- The TCS indicators turn ON.
- The antilock brake system (ABS) remains functional.
Diagnostic Aids
Thoroughly inspect connections and wiring that may cause an intermittent malfunction. Refer to Testing for Electrical Intermittents , Wiring Repairs , and Connector Repairs in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step tests for the proper voltage output on the 5-volt reference circuit and the proper operation of the signal circuit.
- 3: This step tests for possible low 5-volt reference output or a problem with the signal circuit.
- 4: This step tests for a short to voltage on the 5-volt reference circuit. If a short to voltage exists, other DTCs may be set for the vehicle stability system if equipped.
- 8: This step tests for a problem with the low reference circuit. If a short to voltage exists, other DTCs may be set for the vehicle stability system if equipped.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: ABS Schematics Connector End View Reference: ABS Connector End Views | ||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | |
| 2 | Turn OFF the ignition. Connect a 3-amp fused jumper wire between the longitudinal accelerometer 5-volt reference circuit and the longitudinal accelerometer signal circuit. Turn ON the ignition, with the engine OFF. With the scan tool, observe the longitudinal accelerometer parameter. Does the scan tool indicate that the longitudinal accelerometer parameter is in between the specified voltage range? | 4.5-5.5 V | Go to Step 8 | Go to Step 3 |
| 3 | With the 3-amp fused jumper wire still connected, does the scan tool indicate that the longitudinal accelerometer parameter is in below the specified voltage value? | 4.5 V | Go to Step 5 | Go to Step 4 |
| 4 | Test the longitudinal accelerometer 5-volt reference circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 7 | |
| 5 | Test the longitudinal accelerometer 5-volt reference circuit for the following conditions: An open A short to ground A high resistance Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 6 | |
| 6 | Test the longitudinal accelerometer signal circuit for the following conditions: An open A short to ground A high resistance Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 11 | |
| 7 | Test the longitudinal accelerometer signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 11 | |
| 8 | Test the longitudinal accelerometer low reference circuit for the following conditions: An open A short to voltage A high resistance Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 9 | |
| 9 | Inspect for poor connections at the harness connector of the yaw rate and lateral accelerometer sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 10 | |
| 10 | Replace the yaw rate and lateral accelerometer sensor. Refer to Brake Fluid Pressure Sensor Replacement . Did you complete the replacement? | Go to Step 12 | ||
| 11 | Replace the electronic brake control module (EBCM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 12 | ||
| 12 | Clear the DTCs using the scan tool. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset? | Go to Step 2 | System OK | |
DTC C0192
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 vehicles 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 drivers 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.
DTC Descriptor
This diagnostic procedure supports the following DTC
DTC C0196 Yaw Rate Circuit
This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description in Vehicle DTC Information.
| DTC Symptom | DTC Symptom Descriptor |
|---|---|
| 00 | No Additional Information |
DTC C0196
Conditions for Running the DTC
- The ignition is ON.
- The ignition voltage is greater than 8 volts.
- The vehicle is stopped or the vehicle speed is greater than 45 km/h (28 mph).
- The yaw rate isolation test runs with any of the following conditions: The brake pedal is not pressed. ABS is not active. The vehicle speed is greater than 8 km/h (5 mph). Lateral acceleration is less than 0.5 g. VSES is not active on undriven axle and TCS is active. AWD TCS is active.