Mando RCU Valve test

Gen3/tasks/TEST-BRAKE_RCU-VALVE-TEST

Model 3 / Y

What this task does

This routine confirms correct operation of the RCU pump motor and solenoid valves. For a dry or partially filled RCU, this test is also a viable repair method.

Vehicle & firmware coverage

Open a version to see its description, requirements, and input definitions. Hardware configuration and live vehicle checks also determine availability.

Model 3 / Y AMD · Firmware 2026.32.3

Vehicle coverage: 2025+ Model Y
Supported connection: Local connection
Vehicle state: Stationary · Parked
Gateway diagnostic level: No specific level listed

Procedure notes

Do not press the brake pedal during testing.

Task inputs (2)

Leakage check start pressure threshold.

leakage_check_start_pressure_threshold · Float

Minimum allowed pressure at the start of leakage check to pass.

Firmware default: 10

Pressure Ratio

service_pressure_ratio_threshold · Float

Applicable to service only. Ratio of pressure drop to the start pressure during an RCU leakage check.

Firmware default: 0.4