C0186
DTC C0186 or C0196
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC C0186 00
-
Lateral Accelerometer Circuit
DTC C0186 09
-
Lateral Accelerometer Rate of Change Above Threshold
DTC C0186 11
-
Lateral Accelerometer Circuit Above Maximum Threshold
DTC C0186 18
-
Lateral Accelerometer Circuit Signal Amplitude Less Than Minimum
DTC C0186 0A
-
Lateral Accelerometer Circuit Rate of Change Below Threshold
DTC C0186 4B
-
Lateral Accelerometer Circuit Calibration Not Learned
DTC C0196 00
-
Yaw Rate Circuit
DTC C0196 0A
-
Yaw Rate Circuit Rate of Change Below Threshold
DTC C0196 09
-
Yaw Rate Circuit Rate of Change Above Threshold
DTC C0196 11
-
Yaw Rate Circuit Above Maximum Threshold
DTC C0196 18
-
Yaw Rate Circuit Signal Amplitude Less Than Minimum
Circuit/System Description
The lateral accelerometer and the yaw rate sensors are combined into one sensor external to the electronic brake control module (EBCM). The vehicle stability enhancement system (VSES) uses the lateral accelerometer input when calculating the desired yaw rate. The EBCM receives the yaw/lateral accelerometer sensor data from dedicated serial data circuits.
Conditions for Running the DTC
* Ignition ON.
* The ignition voltage is greater than 10 V.
Conditions for Setting the DTC
C0186 00, C0186 09, C0186 11, C0186 18, C0196 00, C0196 09, C0196 11, or C0196 18
The yaw/lateral accelerometer sensor fails an internal self test.
C0186 09 or C0196 09
The yaw/lateral accelerometer sensor is not mounted properly.
C0186 4B
The yaw/lateral accelerometer sensor is not calibrated.
Action Taken When the DTC Sets
* The EBCM disables the VSES for the duration of the ignition cycle.
* A DIC message and/or a warning indicator may be displayed.
Conditions for Clearing the DTC
* The condition for setting the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.
Reference Information
Schematic Reference
Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
ABS Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify that DTC U0125 is not set.
• If the DTC is set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle
• If the DTC is not set
3. Verify the yaw and lateral acceleration sensor is installed correctly.
• If loose or incorrect installation
Correct the installation of the component.
• If installed correctly
4. Perform the Acceleration Sensor Reset procedure with a scan tool.
5. Verify the DTC does not set while operating the vehicle under the Conditions for Running the DTC.
• If the DTC sets
Refer to Circuit/System Testing.
• If the DTC does not set
6. All OK.
Circuit/System Testing
1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the yaw and material acceleration sensor. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 6 and ground.
• If 10 ohms or greater
1. Ignition OFF, disconnect the harness connector at the electronic brake control module.
2. Test for less than 2 ohms in the low reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the electronic brake control module.
• If less than 10 ohms
3. Ignition ON.
4. Verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
• If the test lamp does not illuminate
1. Ignition OFF, disconnect the harness connector at the electronic brake control module.
2. Test for infinite resistance between the ignition circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the ignition circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the electronic brake control module.
• If the test lamp illuminates
5. Replace the yaw and material acceleration sensor.
6. Verify the DTC does not set while operating the vehicle under the Conditions for Running the DTC.
• If the DTC sets
Replace the electronic brake control module.
• If the DTC does not set
7. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Vehicle Yaw Sensor with Vehicle Lateral and Longitudinal Accelerometer Replacement Service and Repair
* Control Module References Control Module References for electronic brake control module replacement, programming and setup