Circuit Description
The electronic brake control module (EBCM) monitors the ON/OFF state of each solenoid and recognizes when the ABS is in pressure decrease too long. This fault indicates that the EBCM was unable to decrease brake pressure enough to a certain wheel to prevent excessive wheel slip.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C1216 Valve Solenoid Release
Conditions for Running the DTC
| • | The ABS is active. |
| • | The wheel speed is less than 5 km/h (3 mph). |
Conditions for Setting the DTC
The solenoid of the wheel is releasing for greater than 1 second.
Action Taken When the DTC Sets
If equipped, the following actions occur:
| • | The EBCM disables the ABS/traction control system (TCS) for the duration of the ignition cycle. |
| • | The ABS indicator turns ON. |
| • | The Traction Off indicator turns ON. |
| • | The message center displays the Service Traction 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
Possible causes of this DTC are the following conditions:
| • | A contaminated hydraulic unit |
| • | An intermittent wheel speed sensor |
| • | A sticking solenoid |
| • | Excessive brake drag or high resistance in base brake system |
| • | Suspension system irregularities |
Step | Action | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Antilock Brake System 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 |
Does the scan tool display any other ABS DTCs relating to wheel speed sensor or solenoid valve operation? | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | Go to Step 3 | ||||||
3 | With a scan tool, monitor all of the wheel speed sensor in the ABS Data Display while decelerating the vehicle from 56 to 0 km/h (35 to 0 mph). Do any of the wheel speeds indicate erratic or intermittent operation? | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | Go to Step 4 | ||||||
4 | Inspect the base brake system for the following conditions:
Did you find and correct the condition? | Go to Step 7 | Go to Step 5 | ||||||
5 |
Does the DTC reset as a current DTC? | Go to Step 6 | System OK | ||||||
6 | Replace the brake pressure modulator valve (BPMV). Refer to Brake Pressure Modulator Valve Replacement . Did you complete the repair? | Go to Step 7 | -- | ||||||
7 |
Does the DTC reset? | Go to Step 2 | System OK | ||||||
