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Home >> Volvo >> 1995 >> 850 Base, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Turbo >> Diagnostic Trouble Code Testing >> MOTRONIC 4.3 Control System >> Code 3-1-1: Vehicle Speed Sensor Signal

Code 3-1-1: Vehicle Speed Sensor Signal

  1. Test drive vehicle. Using Volvo Scan Tool (998-8686 ), read off VSS signal. If speed is zero MPH, fault is permanent. Go to next step. If speed is okay, fault is intermittent. Go to step 6).
  2. Test drive vehicle and ensure speedometer functions. If speedometer shows zero MPH, speedometer or one of its components is defective. If speedometer is okay, determine if speedometer is VDO or Yazaki style. See the INSTRUMENT PANELS article in the ACCESSORIES/SAFETY EQUIPMENT section. If speedometer is VDO, go to next step. If speedometer is Yazaki, go to step 4).
  3. Turn ignition on. Check if Code 1-3-1 is stored. If Code 1-3-1 is stored, check wiring between instrument cluster connector terminal A7 and ECM terminal B18 for a short circuit to voltage. If Code 1-3-1 is not stored, go to next step.
  4. Connect breakout box between ECM and ECM connector. Shift transmission to Neutral. Raise and support front of vehicle. Turn ignition on. Connect voltmeter between breakout box pins No. 18 and 28. Rotate front wheels. If voltmeter reading varies between .5-5 volts, source of code is poor contact in ECM connector. Repair as necessary. If voltmeter shows a steady reading of about zero volts, check wiring between instrument cluster connector terminal A7 and ECM terminal B18 for a short circuit to ground. If voltmeter shows a steady reading of greater than 5 volts, on VDO speedometer, check wiring between instrument cluster connector terminal A7 and ECM terminal B18 for an open circuit. On Yazaki speedometer, go to next step.
  5. Turn ignition off. Connect an ohmmeter between breakout box pins No. 18 and 28. If ohmmeter reads about 500 ohms, check wiring between instrument cluster connector terminal A7 and control module terminal B18 for a short circuit to voltage. If ohmmeter does not read 500 ohms, check wiring between instrument cluster connector terminal A7 and control module terminal B18 for an open circuit.
  6. Turn ignition on. Check if Code 1-3-1 is stored. If Code 1-3-1 is stored, check wiring between instrument cluster connector terminal A7 and ECM terminal B18 for an intermittent short circuit to voltage. If Code 1-3-1 is not stored, check instrument cluster circuit for intermittent faults. Check ECM and instrument cluster connectors for an open circuit. Also check wiring between instrument cluster connector terminal A7 and ECM terminal B18 for an intermittent open circuit or intermittent short to ground.
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