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Code 6, Wheel Speed Sensor Signal Changed Rapidly

  1. Turn ignition off. Disconnect RWAL EBCM connector. Check resistance between EBCM terminals No. 16 (Orange wire) and No. 17 (White wire) while wiggling wire harness between sensor and RWAL EBCM. If reading is not 1000-2000 ohms and steady, go to step 4).
  2. If reading is 1000-2000 ohms and steady, remove speed sensor from rear differential case. Inspect tip of sensor for metal particles. If metal particles are present, replace sensor and go to next step.
  3. Inspect exciter ring through sensor hole in differential case. Rotate exciter ring and check for damaged teeth and lateral runout. If exciter ring is damaged or lateral runout is present, replace exciter ring. If exciter ring is okay, go to step 6).
  4. If resistance between terminals No. 16 (Orange wire) and No. 17 (White wire) of RWAL EBCM connector is not 1000-2000 ohms and steady, disconnect speed sensor connector. Measure resistance across sensor connector terminals. If resistance is 1000-2000 ohms, repair open or short in White wire and/or Orange wire between RWAL EBCM and speed sensor. Ensure connector is clean and tight.
  5. If resistance is greater than 2000 ohms or less than 1000 ohms, replace wheel speed sensor. After replacing speed sensor, ensure sensor output voltage is greater than 650 millivolts using procedure described in step 6).
  6. On all models, install speed sensor and connect connector. Reconnect RWAL EBCM connector. Raise vehicle, and support with rear wheels off of floor. Ensure vehicle is in 2H mode (2WD). Start engine, and turn wheels a least 20 MPH. Backprobe between RWAL EBCM terminals No. 16 (Orange wire) and No. 17 (White wire) using a 1-megohm DVOM on AC-volts scale.
  7. If voltage reading is greater than 650 millivolts and steady, replace RWAL EBCM. See RWAL ELECTRONIC BRAKE CONTROL MODULE  under REMOVAL & INSTALLATION. If voltage reading is less than 650 millivolts or is erratic, replace wheel speed sensor.
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