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8-236 ELECTRICAL-BODY AND CHASSIS 3. Speedometer needle jumps erratically Checkpoint Trouble Cause Countermeasure Replace the vehicle speed Vehicle speed sensor malfunction, or open circuit or poor connector contact NG Replace the speedometer Use meter tester to check the speedometer function Speedometer malfunction NG OK Check the vehicle speed sensor output by using the oscilloscope Inspection of a waveform by oscilloscope 1. Connect a resistance of 1.3 to 5k ohm (1.4W or more) between the harness side connectors 2 B-24 and 9 B-23 of the meter. 2. Install a speedometer tester. 2. Turn on the starter SW. 3. Check the waveform at the time when the vehicle speed is at 60km/h. 4. Trip odometer does not reset Replace the speedometer Faulty reset mechanism or worn gear NG Check at other kilometer |