The EBCM will set the DTC when one or more of the following conditions have occurred
- The lateral acceleration signal changes to rapidly based on vehicle dynamics.
- The internal calibration in the lateral accelerometer is out of range.
- The lateral accelerometer has failed and internal self check test.
Action Taken When the DTC Sets
If equipped, the following actions will occur
- The EBCM disables VSES for the duration of the ignition cycle.
- The driver information center (DIC) displays the Service Stability System message.
Conditions for Clearing the DTC
- The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
- The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
The lateral accelerometer is packaged with the yaw rate sensor as a single component.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 2: Tests for the proper voltage output on the 5-volt reference circuit and the proper operation of the signal circuit.
- 3: Tests for possible low 5-volt reference output or a problem with the signal circuit.
- 4: 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.
- 8: 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.
| 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. Disconnect the yaw and lateral acceleration sensor harness connector. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the yaw and lateral acceleration sensor and the signal circuit of the yaw and lateral acceleration sensor. Turn ON the ignition, with the engine OFF. With the scan tool, observe the lateral acceleration signal voltage. Does the scan tool indicate that the lateral acceleration signal 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 lateral acceleration sensor parameter is below the specified voltage value? | 4.5 V | Go to Step 5 | Go to Step 4 |
| 4 | Test the 5-volt reference circuit of the yaw and lateral acceleration sensor 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 5-volt reference circuit of the yaw and lateral acceleration sensor 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 lateral 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 lateral 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 low reference circuit of the yaw and lateral acceleration sensor 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 and lateral acceleration 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 and lateral acceleration sensor. Refer to Yaw Rate Sensor/Lateral Accelerometer 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 C0186 or C0187
Circuit Description
The electronic brake control module (EBCM) uses the yaw rate signal to determine the directional angle of the vehicle during a turn or a skid. The EBCM uses the signal from the yaw rate as one of the inputs to operate the vehicle stability enhancement system (VSES).
DTC Descriptor
This diagnostic procedure supports the following DTC
DTC C0196 Yaw Rate Circuit
Conditions for Running the DTC
The ignition voltage is greater than 8 volts.
Conditions for Setting the DTC
The EBCM will set the DTC when one or more of the following conditions have occurred
- The yaw rate signal is less than 0.18 volt or greater than 4.84 volts.
- The yaw rate signal changes to rapidly based on vehicle dynamics.
- The internal calibration in the yaw rate is out of range.
- The yaw and lateral acceleration sensor has failed and internal self check test.
If equipped, the following actions will occur
- The EBCM disables VSES for the duration of the ignition cycle.
- The driver information center (DIC) displays the Service Stability System message.
- The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
- The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
The lateral accelerometer is packaged with the yaw rate sensor as a single component.
The numbers below refer to the step numbers on the diagnostic table.
- 2: Tests for the proper voltage output on the 5-volt reference circuit and the proper operation of the signal circuit.
- 3: Tests for possible low 5-volt reference output or a problem with the signal circuit.
- 4: 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.
- 8: 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.
| 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. Disconnect the yaw and lateral acceleration sensor harness connector. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the yaw and lateral acceleration sensor and the signal circuit of the yaw and lateral acceleration sensor. Turn ON the ignition, with the engine OFF. With the scan tool, observe the yaw rate signal voltage. Does the scan tool indicate that the yaw rate signal 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 yaw rate sensor parameter is below the specified voltage value? | 4.5 V | Go to Step 5 | Go to Step 4 |
| 4 | Test the 5-volt reference circuit of the yaw and lateral acceleration sensor 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 5-volt reference circuit of the yaw and lateral acceleration sensor 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 yaw rate 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 yaw rate 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 low reference circuit of the yaw and lateral acceleration sensor 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 and lateral acceleration 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 and lateral acceleration sensor. Refer to Yaw Rate Sensor/Lateral Accelerometer 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 C0196
The system relay is energized when the ignition is ON. The system relay supplies voltage to the valve relay. The electronic brake control module (EBCM) activates the valve relay to supply voltage to the valve solenoids. This voltage is referred to as the system voltage. The EBCM microprocessor activates individual valve solenoids by grounding the valve solenoid control circuits.
DTC Descriptors
This diagnostic procedure supports the following DTCs
- DTC C0220 Left Front ABS Channel in Release Too Long
- DTC C0221 Right Front ABS Channel in Release Too Long
- DTC C0228 Left Rear ABS Channel in Release Too Long
- DTC C0229 Right Rear ABS Channel in Release Too Long
- Ignition voltage is greater than 8 volts.
- The system is in a ABS braking event.
This code is set when the following criteria are met.
- The EBCM is commanding a valve solenoid to release brake pressure.
- The wheel that is commanded to release brake pressure has a speed below 5 km/h (3 mph) for 1.25 seconds.
If equipped, the following actions occur
- The EBCM disables the ABS system.
- The ABS indicator turns ON.
- The driver information center (DIC) displays the Service ABS System message.
- The traction control system (TCS) is disabled.
- The DIC displays the Service Traction System Message.
- The vehicle stability enhancement system (VSES) is disabled.
- The DIC displays the Service Stability System Message.
- The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
- The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Always diagnose and repair any wheel speed sensor failures prior to diagnosing DTCs C0220, C0221, C0228 or C0229. These DTCs in theory may be set on surfaces that are nearly impossible to get traction on. If the DTC sets within these conditions, diagnosis of the ABS system may not be necessary.
The number below refers to the step number on the diagnostic table.
- 2: This step checks for DTCs that are wheel speed related. Wheel speed DTCs must be diagnosed first.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: ABS Schematics | |||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Are any wheel speed related DTCs set? | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | Go to Step 3 |
| 3 | Use the scan tool in order to clear the DTCs. Use the scan tool and perform the solenoid test. Refer to Scan Tool Output Controls . Do the solenoids in question function normally? | Go to Diagnostic Aids | Go to Step 4 |
| 4 | Replace the brake pressure modulator valve (BPMV). Refer to Brake Pressure Modulator Valve (BPMV) Replacement . Did you complete the repair? | Go to Step 5 | |
| 5 | Use the scan tool and perform the solenoid test. Do the solenoids in question function normally? | System OK | Go to Step 2 |
DTC C0220-C0229
The electronic brake control module (EBCM) and the powertrain control module (PCM) simultaneously control the Traction Control System (TCS). The EBCM sends a Requested Torque message via a pulse width modulated (PWM) signal to the PCM. The duty cycle of the signal is used to determine how much engine torque the EBCM is requesting the PCM to deliver. Normal values are between 10 and 90 percent duty cycle. The signal should be at 90 percent when traction control is not active and at lower values during traction control activations. The PCM supplies the pull up voltage that the EBCM switches to ground to create the signal.