Code 6, Wheel Speed Sensor Signal Changes Rapidly
- Turn ignition off. Disconnect RWAL ECM connector. Check resistance between ECM terminals No. 9 and 10 while wiggling harness between sensor and ECM. See Figure.
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- If reading is not 1000-2000 ohms and steady, go to step 4). 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.
- 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 no faults are found, go to step 6).
- If resistance between terminals No. 9 and 10 of RWAL ECM 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 or Orange wire between RWAL ECM and speed sensor.
- If resistance is greater than 2000 ohms or less than 1000 ohms, replace wheel speed sensor. After replacing sensor, verify speed sensor signal by using procedure described in steps 6) and 7).
- Reinstall speed sensor, and reconnect connector. Reconnect RWAL ECM connector. Raise vehicle, and support with rear wheels off of floor. Start engine, and drive vehicle faster than 20 MPH. Backprobe RWAL ECM terminals No. 9 and 10 using a 10-megohm DVOM on AC-volts scale.
- If voltage reading is greater than 650 mV and steady, replace RWAL ECM. If voltage reading is less than 650 mV or is erratic, replace wheel speed sensor.