Code 44/45/46 - Channel (Motor) Will Not Move: Notes
- Code 44 - Left Front Channel
- Code 45 - Right Front Channel
- Code 46 - Rear Channel
Detects bound-up Expansion Spring Brake (ESB), a stuck ABS motor or a seized hydraulic modulator. When ESB release is commanded by EBCM/EBTCM during initialization, ESB should release ABS motor, resulting in sensed current being less than commanded current (motor free-spinning). If ABS motor is not moving, sensed current will be equal to stall current.
Codes 44/45/46 can set during normal operation and EBCM/EBTCM detects a condition in which it cannot move ABS motor in either direction. Code will be stored, ABS will be disabled and ABS warning light illuminated.
NOTE:
Test numbers refer to numbers on diagnostic chart. Use only 10-megohm (minimum) DVOM for all voltage and resistance tests. For identification of circuits and terminals referenced in charts and text, see WIRING DIAGRAM
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- Checks if motor terminals are in proper connector cavities.
- Checks for proper motor movement during apply and release command from Tech 1 scan tool.
- Compares command and feedback current.
- Checks for short between ABS motor high and low circuit.
- Checks for internally shorted ABS motor.
- Determines if malfunction is due to poor terminal contact or EBCM/EBTCM.
- Verifies if ABS motor can release when commanded.
- Checks for proper hydraulic modulator gear and piston movement.