DTC 46

Code 46: Rear ABS Channel Will Not Move.:

DTC 46 Rear ABS Channel Will Not Move:

Circuit Description:
This DTC is designed to detect bound-up ESB, a stuck ABS motor, or a seized hydraulic modulator. When the release is commanded during initialization, the ESB should release the ABS motor, resulting in sensed current being less than commanded current (motor is spinning freely). If the ABS motor is not moving, sensed current will be equal to stall current.

DTC Will Set When:
DTC 46 can be set during normal operation. If the EBCM detects a condition in which it cannot move the motor in either direction, a malfunction exists.

Action Taken:
This malfunction indicates the channel cannot be moved properly. A malfunction DTC is stored, ABS is disabled. The amber ABS warning lamp is turned

DTC Chart Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks for proper motor movement during apply and release commands from the Tech 1.
2. Compares EBCM command current to motor feedback current.
3. Checks for shorted circuit between the ABS motor "HIGH" and ABS motor "LOW" circuits.
4. Checks for an ABS motor that is internally shorted.
5. Checks to see if malfunction is due to poor terminal contact or the EBCM.
6. Verifies that the motor can actually apply when commanded.
7. Checks for proper hydraulic modulator gear and piston movement.

Diagnostic Aids:
An intermittent malfunction in this DTC may result from a mechanical part of the system that sticks, or binds.

The frequency of the malfunction can be checked by using the enhanced diagnostic function of the Tech 1. DTC 46 may set after modulator disassembly if the modulator pistons are positioned at the bottom of their bore. Depending on the frequency of the malfunction, a physical inspection of the mechanical parts suspected may be necessary.

Any circuitry that is suspected of causing the intermittent complaint should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.