The system relay is energized when the ignition is ON. The system relay supplies voltage to the valve solenoids and the pump motor. This voltage is referred to as the system voltage. The electronic brake control module (EBCM) microprocessor activates the valve solenoids by grounding the control circuit.
• | The system voltage is greater than 8 volts. |
• | The ignition voltage is greater than 9 volts. |
The commanded state of the driver and the actual state of the control circuit do not match for 0.03 seconds.
If equipped, the following actions occur:
• | The EBCM disables the ABS/TCS/VSES/DRP for the duration of the ignition cycle. |
• | The ABS indicator turns ON. |
• | The TRACTION OFF indicator turns ON. |
• | The DIC displays the SERVICE STABILITY SYSTEM message. |
• | DTC C1248 also sets. |
• | The red BRAKE warning indicator turns ON. |
• | 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. |
The solenoid valve circuit is internal to the EBCM. The solenoid valve circuit is not diagnosable external to the EBCM. The DTC sets when there is a malfunction in the solenoid circuit internal to the EBCM.
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No | ||||||
---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | |||||||
Does the DTC reset as a current DTC? | -- | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | |||||||
3 |
Important: Perform the setup procedure for the EBCM. An unprogrammed EBCM will result in the following conditions:
Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Did you complete the repair? | -- | Go to Step 4 | -- | ||||||
4 |
Does the DTC reset? | -- | Go to Step 2 | System OK |