The inlet valve solenoid circuits are supplied with battery power when the ignition is in the ON position. The EBCM/EBTCM controls the valve functions by grounding the circuit when necessary.
The EBCM/EBTCM senses a discrepancy in the circuit such as:
| • | An open. | 
| • | A short to ground. | 
| • | A short to voltage. | 
| • | A malfunction DTC stores. | 
| • | The ABS/TCS disables. | 
| • | The ABS/TCS indicator(s) turn on. | 
| • | Condition for DTC is no longer present and scan tool clear DTC function is used. | 
| • | 100 ignition cycles have passed with no DTCs detected. | 
The solenoid valve circuit and the solenoid coil are internal to the EBCM/EBTCM. No part of the solenoid circuit is diagnosable external to the EBCM/EBTCM. The DTC sets when there is a malfunction in the solenoid circuit internal to the EBCM/EBTCM only.
The number below refer to step number on the Diagnostic Table.
Step  | Action  | Value(s)  | Yes  | No  | 
|---|---|---|---|---|
1  | Was the Diagnostic System Check performed?  | --  | ||
 Does DTC C1263 reset as a current DTC?  | --  | |||
3  | Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module/Electronic Brake and Track Control Module Replacement . Is the repair complete?  | --  | --  |