CUSTOMER CONCERN DTC C1391 is stored and the ABS actuator pump cycles repeatedly while a hissing sound comes from the actuator. CAUSE Accumulator pressure repeatedly fell from about 3.8 volts to 3.2 volts, causing the pump to restart. The actuator leaked internally past its solenoids and could not hold brake pressure. CORRECTION Remove and replace the ABS actuator assembly, perform the required resets and calibration, clear DTC C1391, and verify accumulator pressure remains s

CUSTOMER CONCERN Customer requests diagnosis because the skid-control system will not complete calibration and stores DTCs C1345 and C1368. CAUSE The skid-control ECU had not completed the linear-solenoid-valve offset learning. Calibration required a properly bled brake system, cleared learning memory and at least 12.6 volts at the skid-control ECU. CORRECTION Perform the bidirectional brake bleeding procedure, clear the skid-control learning memory and perform the linear-sol