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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 C1B2D Solenoid Valve 2 Circuit Low >> General Description >> Diagnostic Method

Diagnostic Method

An open or insufficient current is detected in the solenoid.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Case 1 
Output duty Cycle-Current MAP A
NOTE: Threshold is Current
Less than Table 1 A
Case 2 
Output duty Cycle-Current MAP B
NOTE: Threshold is Current
Less than Table 2 A
Case 3 
Solenoid Valve high side voltage
More than 5.46 V
PRESSURE-REDUCING LINEAR SOLENOID VALVE OUTPUT DUTY CYCLE-CURRENT MAP A (LOW THRESHOLD MAP) SPECIFICATION

Output Duty (%) 19.4 22.04 24.44 29.37 44.2 68.93 83.94 101.34
Threshold (A) 0.00 0.05 0.10 0.20 0.50 1.00 1.30 1.65
PRESSURE-REDUCING LINEAR SOLENOID VALVE OUTPUT DUTY CYCLE-CURRENT MAP B (LOW THRESHOLD MAP) SPECIFICATION

Output Duty (%) 30 30 30.9 38.64 47.67 77.28 95.34 154.56
Threshold (A) 0.000 0.097 0.100 0.130 0.165 0.260 0.330 0.52

Time needed for diagnosis: 

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