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Home >> Volvo >> 1995 >> 850 GLT, 4D Sedan, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Engine Controls - Tests W/Codes - Non-Turbo (M/T) - MOTRONIC 4.4) >> Circuit Tests >> DTC 311 - Speedometer Signal

DTC 311 - Speedometer Signal

WARNING: This page is about a different car, the 1996 Volvo 850. However, it is still accessible from the selected car via links, so may be relevant.
  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. Check for ABS and instrument cluster DTCs. See appropriate INSTRUMENT PANEL CLUSTER and ANTI-LOCK BRAKE SYSTEMS articles.
  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. VDO cluster has odometer below speedometer needle. Yazaki cluster has odometer above speedometer needle. If speedometer is VDO, go to next step. If speedometer is Yazaki, go to step 4).
  3. Turn ignition on. Check if DTC 131 is stored. If DTC 131 is stored, check wiring between instrument cluster connector terminal A7 and ECM connector terminal B18 for a short circuit to voltage. If DTC 131 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 .5-12 volts, source of DTC is poor contact in ECM connector. Repair as necessary. If voltmeter shows a steady reading of about zero volts, check for instrument cluster DTCs. If voltmeter shows a steady reading of greater than 5 volts on VDO speedometer, check for instrument cluster DTCs. See appropriate INSTRUMENT PANEL CLUSTER article. On Yazaki speedometer, go to next step.
  5. Turn ignition off. Connect a test light between breakout box pins No. 18 and 28. Turn ignition on. If test light comes on, check wiring between instrument cluster connector terminal A7 and ECM connector terminal B18 for a short to voltage. If test light does not come on, check wiring between instrument cluster connector terminal A7 and control module terminal B18 for an open circuit.
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