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Home >> Volvo >> 1992 >> 960 4D Sedan >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Fault Code Testing >> Code 3-1-1 (Speedometer Signal)
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Code 3-1-1 (Speedometer Signal)

  1. Control unit is dependent on this signal for WOT enrichment, fan control, etc. A fault code will be set if speed exceeds 3390 RPM, load signal corresponds to part load and signal is absent for 3 seconds.
  2. To check speedometer signal, raise vehicle with rear wheels suspended. Connect Measuring Unit (999-3070 ) to ECU. See CONNECTING MEASURING UNIT TO ECU  . Connect voltmeter between terminals No. 9 and 19. Turn ignition on. Spin rear wheels, and check voltmeter. Voltage should be 0.1-12.0 volts.
  3. If voltage is not present, check wiring between control unit and instrument cluster. Connect ohmmeter between terminal No. 9 and terminal at rear of instrument cluster (Green/Orange wire). Ohmmeter should indicate zero ohms.
  4. If no reading is obtained, check wiring between instrument cluster and control unit. If reading is obtained, check wiring between instrument cluster and rear axle. On A/T models, check test mode No. 1 if speed signal fault is obtained. See TEST MODE NO. 1 under RETRIEVING CODES  .
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