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Home >> Isuzu >> 1998 >> Trooper S, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Component Tests >> Vehicle Speed Sensor (VSS)

Vehicle Speed Sensor (VSS)

  1. Lift and support drive wheels of vehicle. Remove instrument cluster and disconnect connector I-9. Connect a resistance of 1.3 to 5 ohms (1.4 watts or more) between Blue/Yellow wire of connector I-9 terminal No. 15 (terminal No. 26 on "S" models) and instrument cluster connector I-10 terminal No. 5 (Light Green/White wire). See Figure .
  2. Install a speedometer tester. Start vehicle and bring speed up to 37 MPH. Check waveform from VSS with oscilloscope. Normal waveforms are between approximately 12 volts to 2 volts with a cycle of 23.6 milliseconds. If waveforms are normal, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION.
  3. If waveforms are not normal, check for open/shorted wires or poor connections between VSS and instrument cluster and repair as necessary. See WIRING DIAGRAMS  . If all circuits and connectors are okay, replace VSS. See VEHICLE SPEED SENSOR (VSS) under REMOVAL & INSTALLATION.
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