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Code 6 (Speed Sensor Signal Rapidly Cuts In And Out)

  1. This condition only happens while driving. Turn ignition off. Disconnect battery. Measure resistance between module connector pins No. 3 and 10, while shaking wiring harness between speed sensor and module connector. See Figure . If reading is erratic, repair loose connection in sensor leads.
  2. If resistance is 1000-2000 ohms and steady, remove speed sensor. Check for build up of metal chips on sensor pole. If metal chips are present, drain and clean differential. Check exciter ring for broken or chipped teeth. If no metal chips are present, remove sensor from carrier.
  3. Inspect exciter ring for damaged teeth. If teeth are okay and no visible lateral runout is seen, reinstall speed sensor. If teeth are damaged and lateral runout is visible, repair differential.
  4. To check for low or erratic sensor output, raise vehicle to allow rear wheels to spin freely. Start engine. With rear wheels rotating at 5 MPH, measure voltage between test connector pins. If voltage is 650 mV or more and steady, replace control module. If voltage is less than 650 mV and/or is erratic, replace speed sensor and test connector cap. Retest system.
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