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Home >> Subaru >> 2021 >> Crosstrek Limited >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Electric Brake Booster System (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC C1C40 Brake Ecu >> General Description >> Diagnostic Method

Diagnostic Method

Electric brake booster control module checks internal malfunction.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Case 1: EEPROM Malfunction 
EEPROM write Malfunction
EEPROM read Malfunction
Invalid
Invalid
Case 2: CPU Internal Malfunction 
CPU Internal Malfunction
Invalid
Case 3: IC Malfunction 
Relay Cutoff Malfunction with IC1 or IC2
Invalid
or
Solenoid Valve Cutoff Malfunction with IC1 or IC2
Invalid
or
EXCLK Monitoring Malfunction with IC1 or IC2
Invalid
or
Q & A Monitoring Malfunction with IC1 or IC2
Invalid
or
ERRIN Monitoring Malfunction with IC1 or IC2
Invalid
or
Hard Drive Circuit Malfunction
Invalid
or
Low Side Driver Malfunction
Invalid

Time needed for diagnosis: 

Malfunction indicator light illumination:  Illuminates as soon as a malfunction occurs.