• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Lateral Accelerometer 5-volt Reference Circuit | C0186 00 | C0186 00 | C0186 00, C0186 19 | -- |
Lateral Accelerometer Signal Circuit | C0186 00 | C0186 00 | C0186 00, C0186 08, C0186 09, C0186 19 | C0186 1A, C0186 08, C0186 09, C0186 52 |
Lateral Accelerometer Low Reference Circuit | -- | C0186 00 | -- | -- |
The electronic brake control module (EBCM) uses the lateral accelerometer signal to determine the lateral forces acting on a vehicle during a turn or a skid. The EBCM uses the signal from the lateral accelerometer as one of the inputs to operate the vehicle stability enhancement system (VSES).
• | The ignition is ON. |
• | Ignition voltage is greater than 8 volts. |
• | Ignition voltage is ON. |
• | Ignition voltage is greater than 8 volts. |
• | The vehicle speed is greater than 0 km/h (0 mph). |
• | Ignition voltage is ON. |
• | Ignition voltage is greater than 8 volts. |
• | The vehicle is stationary. |
• | Ignition voltage is ON. |
• | Ignition voltage is greater than 8 volts. |
• | DTC C0196 is not set. |
• | The yaw rate sensor is less than 8 degrees/second. |
One of the following conditions exist:
• | The lateral accelerometer sensor input voltage is less than 0.15 volt. |
• | The lateral accelerometer sensor input voltage is greater than 4.85 volts for 0.03 second. |
The lateral accelerometer signal voltage does not increase at least 0.5 volt during the lateral accelerometer sensor self test.
The lateral accelerometer signal is greater than 108 m/s² (11 g) per second twice within 0.2 second.
The lateral accelerometer signal is greater than 4.9 m/s² (0.5 g) for 1 second.
Both of the following conditions exist:
• | The compensated bias value of the lateral accelerometer signal is greater than 2.9 m/s² (0.3 g). |
• | The yaw rate sensor is 0 degrees/second. |
The slip rate error exceeds 4.9 m/s² (0.5 g) 60 times within one drive cycle.
If equipped, the following actions will occur:
• | The EBCM disables the VSES for the duration of the ignition cycle. |
• | The driver information center (DIC) displays the SERVICE TRACTION SYSTEM message. |
• | The antilock brake system (ABS) and the traction control system (TCS) remain functional. |
• | 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.
Antilock Brake System Schematics
Control Module References for Scan Tool Information
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM. |
⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM. |
⇒ | If greater than the specified range, test the signal circuit terminal E for a short to voltage. If the circuit tests normal, replace the EBCM. |
⇒ | If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the EBCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for EBCM replacement, setup, and programming |