DTC Advanced Diagnostics: P1E4B-00

DTC P1E4B-00 : Slave Cylinder Drive Motor Circuit Open

NOTE

Initial Diagnosis:
The initial on-board diagnosis occurs right after the vehicle condition is turned to the ON mode, and the brake system indicator (red or amber) comes on, and continues until the indicator goes off.
Regular Diagnosis:
The regular on-board diagnosis begins right after the brake system indicator (red or amber) goes off, and it continues until the vehicle condition is turned to the OFF (LOCK) mode.
Review "How to Troubleshoot the Electric Servo Brake System" before doing the DTC troubleshooting procedure.
Test-drive the vehicle according to local traffic conditions and regulations. Do not test-drive on a lift unless specified.
The possible causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

Confirmation Procedure	Basic Condition: 12 volt battery voltage 9.48 - 16.77 V Operating Condition: Turn the vehicle to the ON mode. Press and hold the brake pedal hard. Release the brake pedal.
Execution	Initial Diagnosis/Regular Diagnosis
Duration	About 1 second
DTC Type	1 drive cycle Brake system indicator (amber) on Brake system indicator (red) on
Fail Safe Action	Stop electric servo brake function (Re-diagnose at the next IG-ON) Stop regenerative brake function (Re-diagnose at the next IG-ON) Stop stall management function (Re-diagnose at the next IG-ON) Stop deceleration assist brake cooperative control function (Re-diagnose at the next IG-ON) Stop brake assist function (Dependant upon the conditions) (Re-diagnose at the next IG-ON) Stop hill start assist function (Re-diagnose at the next IG-ON) Stop driving support control function (Dependant upon the conditions) (Re-diagnose at the next IG-ON) Stop VSA assist function (Re-diagnose at the next IG-ON) Stop automatic brake hold function (Re-diagnose at the next IG-ON)
Possible Cause	Open between the electric servo brake control unit and the tandem motor cylinder (MU, MV, MW lines) Tandem motor cylinder failure (motor) Electric servo brake control unit internal circuit failure