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Speed Indication Jumps Up & Down Erratically

  1. Remove speed sensor from transaxle. Ensure all gear teeth are in good condition, retainer clip is installed and gear does not slip on shaft. If gear and clip are not okay, replace as necessary.
  2. If gear and clip are okay, unplug speed sensor connector. Using DVOM, measure resistance between 2 wires in harness to speed sensor. If resistance is less than 500 ohms, repair circuit No. 150 (Dark Green/White wire). See Figure . Check cluster for intermittent short or open circuits. Recheck speedometer operation.
  3. If resistance is greater than 500 ohms, use DVOM to check for intermittent resistance at speed sensor. If resistance is not 200-230 ohms, replace speed sensor, and recheck speedometer operation. If resistance is 200-230 ohms, reconnect speed sensor wiring.
  4. Disconnect battery ground cable. Remove cluster. Using DVOM, check for intermittent resistance between cluster connector "A" terminals No. 8 (Orange/Yellow wire) and 12 (Dark Green/White wire). Resistance should be 200-300 ohms. If resistance is constant, replace cluster. If resistance is intermittent, check connectors and/or Dark Green/White wire between cluster and speed sensor.
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