DTC 47

DTC 47 Left Front ABS Motor Free Spins (Part 1 Of 2):

DTC 47 Left Front ABS Motor Free Spins (Part 2 Of 2):

DTC 47 Left Front ABS Motor Free Spins:

Circuit Description:
This DTC is designed to detect a stripped nut or gear assembly during initialization. During the homing sequence, the piston should reach the top of the bore resulting in a stalled ABS motor. If this does not occur, the ABS motor must be spinning with little or no resistance, indicating a nut/screw or gear malfunction.

DTC Will Set When:
DTC 47 can only be set during initialization. If the feedback current is less than the command current for a specified period of time, a malfunction exists.

Action Taken:
A malfunction DTC is stored, ABS is disabled, and the ABS warning lamp is turned "ON."

DTC Chart Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks to see if the corresponding open motor DTC is also set.
2. Verifies that the ABS motor was actually applied as command by observing feedback current.
3. Verifies that the ABS motor can release.
4. Verifies that the ABS motor can be applied by observing pedal movement.
5. Checks for an open in the ABS motor "HIGH" circuitry.
6. Checks for an open in the ABS motor "LOW" circuitry.
7. Checks for an ABS motor that is internally shorted.
8. Checks for a stripped gear on the ABS motor pack (unit with three small gears).
9. Checks for a stripped gear on the hydraulic modulator (unit with three large gears).
10. Checks to see if the ABS motor pack has an internal malfunction.
11. Checks for a malfunctioning hydraulic modulator.
12. Ensures malfunction was not due to poor terminal contact.

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

The frequency of the malfunction can be checked by using the enhanced diagnostic function of the Tech 1.

If the DTC only occurs once and DTC 56 also occurs, refer to DTC 56. If intermittent and enhanced diagnostics shows this DTC occurs during ABS, refer to DTC 56.

Depending on the frequency of the malfunction, a physical inspection of the mechanical parts suspected may be necessary.