Civic L4-1.3L Hybrid (2008)
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Initial diagnosis: Done right after the ignition switch is turned to ON (II) and until the AHB indicator and the brake system indicator go off.
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Regular diagnosis: Done right after the initial diagnosis until the ignition switch is turned to LOCK (0).
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When the system detects a problem, the servo unit shifts to fail-safe mode.
Pump Motor
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The pump motor in the power unit operates when the accumulator inner pressure becomes low while the ignition switch is turned to ON (II). You
may hear the motor operate at this time, but it is normal.
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The pump motor is operated by the servo unit. The servo unit has independent main activation and subactivation circuits in the ECU (electric
control unit). If either circuit has a problem, the other one will run the pump motor.
Brake Fluid Replacement/Air Bleeding
Brake fluid replacement and air bleeding procedures for the servo unit and power unit are independent of the conventional brake system.