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Home >> Toyota >> 2021 >> Prius LE AWD-e >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Electronically Controlled Brake System - Diagnostic Codes (2 Of 5) >> Electronically Controlled Brake System >> DTC C1311: Open Circuit in Main Relay 1; DTC C1312: Short Circuit in Main Relay 1 [12/2018 - ] >> Component Operating Range
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Component Operating Range

C12FA

All of the following conditions are met -
Skid control ECU (brake booster with master cylinder assembly) state Normal
Command to main relay On
Brake system voltage 1 (VM1) Higher than 6.92 V
Power supply for linear solenoid 3.5 V or more
C12FB (CASE 1)

All of the following conditions are met -
Skid control ECU (brake booster with master cylinder assembly) state Normal
Command to main relay Off
Power supply for linear solenoid Less than 3.5 V
C12FB (CASE 2)

All of the following conditions are met -
Skid control ECU (brake booster with master cylinder assembly) state Initial check
Command to main relay Off
Power supply for linear solenoid Less than 3.5 V
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