C0026

ABS/LF Wheel Speed Sensor Circuit 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 DTC
^ Left front wheel speed is less than 7 km/h (4 mph).
^ All other wheel speeds are greater than 13 km/h (8 mph)
^ No unexpected wheel acceleration/deceleration. Anything that keeps the left front wheel speed sensor low while the vehicle is moving above 13 km/h (8 mph).

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

NOTE: Diagnostic Trouble Code (DTC) C0026 is a condition latched DTC which indicates the above is true only as long as the condition persists.

CONDITIONS FOR CLEARING THE DTC
^ Conditions for the setting the DTC are repaired and the Scan Tool clear (DTCs) function is used..

WSS Resistance Table:

DIAGNOSTIC AIDS
^ 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.
^ When inspecting a wheel speed sensor, inspect the sensor terminals and harness connector for corrosion. If evidence of corrosion exists, replace the wheel speed sensor.
^ If the ANTILOCK indicator lamp is "ON" only during humid conditions (rain, snow, vehicle wash) all wheel speed sensor circuitry should be thoroughly inspected for signs of water intrusion. Use the following procedure:
a) Spray down the suspected area with 5% salt water solution (two teaspoons of salt to 12 oz. of water).
b) Drive vehicle above 24 km/h (15 mph) for at least 30 seconds.
c) If DTC returns immediately, repair suspected harness.

DTC C0026 LF Wheel Speed Signal Missing (Part 1 Of 2):

DTC C0026 LF Wheel Speed Signal Missing (Part 2 Of 2):

TEST DESCRIPTION
The numbers below refer to the step numbers on the chart.
[3] Checks the resistance of the left front wheel speed sensor.
[4] Checks the output voltage of the left front wheel speed sensor.
[5] Checks for a short between the CKT 873 and CKT 830.
[6] Checks for a short to ground in CKT 873 or CKT 830.