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Instrument Cluster: Impreza

  1. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Turn ignition on. Measure voltage between ground and instrument cluster harness connector terminal No. 7. See Figure . If 10 volts or greater is indicated, go to next step. If less than 10 volts is indicated, repair connector and/or wiring harness as necessary. See WIRING DIAGRAMS  .
  2. Turn ignition off. Measure resistance between ground and instrument cluster harness connector terminal No. 13. If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or greater, repair connector and/or wiring harness as necessary.
  3. If vehicle is equipped with a manual transmission, go to next step. If vehicle is equipped with an automatic transmission, go to step  8 .
  4. Disconnect Vehicle Speed Sensor (VSS) No. 2 harness connector. Measure resistance of Green/Yellow wire between VSS No. 2 harness connector terminal No, 1 and instrument cluster harness connector terminal No. 10. See Figure and Figure . If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or greater, repair wiring harness as necessary.
  5. Turn ignition on. Measure voltage between ground and VSS No. 2 harness connector terminal No. 3 (Green/Black wire). If 10 volts or greater is indicated, go to next step. If less than 10 volts is indicated, repair wiring harness and/or connector as necessary.
  6. Turn ignition off. Measure resistance of Black/Red wire between VSS No. 2 harness connector terminal No. 2 and ground. If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or greater, repair VSS No. 2 ground circuit.
  7. Reconnect VSS No. 2 harness connector. Raise vehicle on stands or hoist so drive wheels may turn freely. Using oscilloscope positive lead, backprobe VSS harness connector terminal No. 1. Using negative lead. backprobe VSS terminal No. 2. Operate vehicle at 12 MPH or greater. If oscilloscope indicates 5 volts or greater, repair or replace speedometer. If less than 5 volts is indicated, replace VSS. Retest system operation.
  8. Disconnect automatic transmission control module harness connector. Measure resistance between instrument panel harness connector terminal No. 10 and A/T control module harness connector terminal No. 13. See Figure and Figure . If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or greater, repair wiring harness and/or connector as necessary. See WIRING DIAGRAMS  .
  9. Reconnect A/T control module harness connector. Raise vehicle on stands or hoist so drive wheels may turn freely. Operate vehicle at 6 MPH or greater. Using DVOM, backprobe A/T control module harness connector terminal No. 13 and measure voltage. If less than one volt or greater than 4 volts is indicated, replace speedometer. If 1-4 volts is indicated, replace A/T control module. After repair, reassemble and install instrument cluster and check for normal operation.
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