Measure Abs Wheel Sensor Frequency - Procedure (ASN 0895-01)

MEASURE ABS WHEEL SENSOR FREQUENCY - PROCEDURE

TECHNICAL SERVICE BULLETIN

MEASURE ABS WHEEL SENSOR FREQUENCY

Model(s): 1986-95 Acura Models

Group: Brakes

Bulletin No.: ASN 0895-01

Date: August, 1995

SERVICE INFORMATION

An ABS diagnostic trouble code (DTC) 4 or 5 indicates a problem in one of the wheel sensor circuits (wiring, sensor, or pulser ring). If the S/M troubleshooting fails to pinpoint the cause of a wheel sensor DTC, try monitoring the alternating current (AC) frequency of each wheel sensor.

You can monitor the wheel sensor circuits by connecting a Fluke 86 or 88 meter to the 6P ABS inspection connector (or ALB checker connector; check the appropriate S/M for the location). The ABS inspection connector is wired like shown in Fig 1 .

1. Turn the meter dial to the AC voltage setting. Depress the "RPM" button three times. The meter display should read like shown in Fig 2 .
   Fig 2: Meter Display Reading

   
2. Connect the RED meter lead to the first sensor wire to be checked. Connect the BLK meter lead to the ground wire or body ground.
3. Drive the vehicle, and monitor the sensor frequency. The frequency should be 0 when the vehicle is stopped, and it should increase smoothly as the vehicle speed increases.
4. Switch the RED meter lead to each of the other wheel sensor wires, drive the vehicle, and monitor the other sensor frequencies. All four sensor readings should be the same; any irregularities in the readings will help identify the problem sensor circuit.