C0029

DTC C0029 Simultaneous Drop-Out Of Front Wheel Speed Signals:

Wheel Speed Sensors Schematic:

CIRCUIT DESCRIPTION
As a toothed ring passes by the wheel speed sensor, changes in the electromagnetic field cause the wheel speed sensor to produce a sinusoidal (AC) voltage signal whose frequency and amplitude is proportional to wheel speed. The magnitude of this signal is directly related to wheel speed and the proximity of the wheel speed sensor to the toothed ring, often referred to as the air gap.

CONDITIONS FOR SETTING DIAGNOSTIC TROUBLE CODES (DTC)
Electronic Brake Control Module (EBCM) losing both front wheel speed signals when the vehicle is at speeds over 19 km/h (12 mph) (brake released) or 32 km/h (20 mph) (brake applied).

ACTION TAKEN WHEN THE DTC SETS
^ ANTILOCK indicator lamp is illuminated
^ ABS is disabled

NOTE: DTC C0029 is an Ignition Latched DTC which indicates the above is true until the ignition is fumed to OFF (even if the cause of the DTC is intermittent).

DIAGNOSTIC AIDS
The 4-way harness connector or the EBCM are the most probable causes for this DTC. An intermittent malfunction may be caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation. 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.


DTC CHART TEST DESCRIPTION
The numbers below refer to the numbers on the diagnostic chart.
2. Check the condition of the EBCM 4-way connector and harness.
3. Road test.