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DTC 311: Speedometer Signal

  1. Test drive vehicle. If speedometer functions correctly, go to next step. If speedometer does not function correctly, see INSTRUMENT PANEL article in ACCESSORIES/SAFETY EQUIPMENT section.
  2. Ensure ignition is off. Connect breakout box and check ground terminals. Repair as necessary. Shift transmission to Neutral. Raise and support rear of vehicle. Turn ignition on. Connect voltmeter between breakout box pins No. 18 and 28. Rotate rear wheels. If voltmeter reading varies between .5-12 volts, source of DTC is poor contact in ECM connector. If voltmeter reading does not vary between .5-12 volts, go to next step.
  3. If voltage reading remains at zero volts, check for short circuit to ground in wiring between instrument cluster connector terminal A7 and ECM connector terminal B18. If voltage reading remains at about 5 volts, connect test light between breakout box pins No. 18 and 28. If test light comes on, check for a short circuit to voltage in wiring between instrument cluster connector terminal D1 and ECM connector terminal B18. If test light does not come on, check for an open circuit in wiring between instrument cluster connector terminal D1 and ECM connector terminal B18.
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