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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 C1B4E Solenoid Valve 4 Circuit High >> General Description >> Diagnostic Method

Diagnostic Method

An excessive current, overcurrent or current leakage is detected in the solenoid.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Case 1 
Output duty Cycle-Current MAP A
NOTE: Threshold is Current
More than Table 1 A
Case 2 
Output duty Cycle-Current MAP B
NOTE: Threshold is Current
More than Table 2 A
Case 3 
Current
0.15 A or more
Case 4 
Current
Exceeds 2.3 A
SEPARATION LOCK VALVE OUTPUT DUTY CYCLE-CURRENT MAP A (HIGH THRESHOLD MAP) SPECIFICATION

Output Duty (%) 0.00 2.02 7.50 16.57 22.01 28.34 35.50 73.51 100.10
Threshold (A) 0.20 0.20 0.50 1.00 1.30 1.65 2.00 4.00 5.40
SEPARATION LOCK VALVE OUTPUT DUTY CYCLE-CURRENT MAP B (HIGH THRESHOLD MAP) SPECIFICATION

Output Duty (%) 0.00 5.00 5.00
Threshold (A) 0.70 0.70 3.00

Time needed for diagnosis: 

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