A035

DTC A035 Rear Wheel Speed Sensor Circuit Open Or Shorted To Battery Or Ground (Part 1 Of 3):

DTC A035 Rear Wheel Speed Sensor Circuit Open Or Shorted To Battery Or Ground (Part 2 Of 3):

DTC A035 Rear Wheel Speed Sensor Circuit Open Or Shorted To Battery Or Ground (Part 3 Of 3):

DTC A035 Rear Wheel Speed Sensor Circuit Open Or Shorted To Battery Or Ground:

Circuit Description:

The toothed wheel generates a voltage pulse as it moves past the sensor; each tooth-gap-tooth series on the wheel generates these pulses. The frequency of these pulses is used by the EBCM to determine wheel speed. The amount of voltage generated in each pulse depends on the air gap between the sensor and the toothed wheel, and on wheel speed.


Failure Condition:

DTC A035 can be set anytime. If the EBCM detects an open, or short to voltage or ground in CKT 9O01 or 9P01, a malfunction exists.


Action Taken:

A DTC A035 is stored, ABS is disabled and the "ABS" indicator is turned "ON."


Test Description:

Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test verifies whether the malfunction is currently present.
2. This step will identify a wheel speed sensor or circuitry that is damaged and visibly apparent.
3. This test checks wheel speed sensor for proper resistance values.
4. This test ensures the wheel speed sensor and sensor ring generate the proper voltage.
5. This step ensures the wheel speed sensor is not shorted to ground.
6. This checks for an open in CKT 9O01.
7. This checks for an open in CKT 9P01.
8. This checks for a short to ground in CKT 9O01 or CKT 9P01.
9. This checks for a short to voltage in CKT 9O01 or CKT 9P01.
10. This checks for shorted wheel speed signal circuits.
11. This step ensures that DTC A035 was not set due to a poor connection between the EBCM and connector C1.


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



If the customer's comments reflect that the "ABS" indicator is on only during moist environmental changes (rain, snow, vehicle wash, etc.), all wheel speed sensor circuitry should be thoroughly inspected for signs of water intrusion. Use the following procedure:

1. Spray down the suspected area with 5% salt water solution (10 ml [2 teaspoons] of salt to 355 ml [12 fl. oz.] of water).

2. Start vehicle and allow it to run for ten seconds.

3. If the DTC returns immediately, replace the suspected harness.

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 replacing a wheel speed sensor, inspect the sensor terminals and harness connector for corrosion and/or water intrusion. If evidence of corrosion or water intrusion exists, replace the wheel speed sensor.