LEMON Manuals: Even more car manuals for everyone
Home >> Subaru >> 2003 >> Outback Limited, 4D Sedan >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - 2.5L >> Self-Diagnostic System >> Malfunction Indicator Light Diagnosis >> Forester, Impreza & Outback Sport

Forester, Impreza & Outback Sport

  1. Turn ignition on. Using a DVOM connected to ground, backprobe ECM harness connector B137 terminal No. 28. See Fig 1. If voltage is less than one volt, go to step  3. If voltage is not less than one volt, wiggle and tug ECM harness and connector. If MIL illuminates, repair poor contact in ECM harness connector. If MIL does not illuminate while wiggling harness and connector, go to next step.
    Fig 1: Identifying ECM 35-Pin Harness Connector
    G00231724Courtesy of SUBARU OF AMERICA, INC.
    Fig 2: Identifying 31-Pin ECM Connector
    G00046382Courtesy of SUBARU OF AMERICA, INC.
    Fig 3: Identifying 14-Pin Instrument Panel Connector
    G00013057Courtesy of SUBARU OF AMERICA, INC.
    Fig 4: Identifying 10-Pin Instrument Cluster Harness Connector
    G00231723Courtesy of SUBARU OF AMERICA, INC.
  2. Check ECM harness connectors for correct connection. If connectors are not properly connected, repair ECM connector as necessary. If connectors are properly connected, check for proper contact. If contact at connector is good, replace ECM.
  3. Turn ignition off and remove instrument cluster. Disconnect ECM harness connector B137 and instrument cluster 14-pin harness connector. Using a DVOM, measure resistance between ECM harness connector B137 terminal No. 28 and instrument cluster 14-pin harness connector terminal No. 1 on Forester, terminal No. 6 on Impreza and Outback Sport. See Fig 3. If resistance is less than one ohm, go to next step. If resistance is not less than one ohm, repair open circuit in harness or poor contact in harness connectors between ECM and instrument cluster.
  4. Check contact of instrument panel harness connector. Repair harness connector contact if necessary and go to next step.
  5. Reconnect ECM harness connector. Turn ignition on. Disconnect instrument panel 10-pin harness connector. Using a DVOM connected to ground, measure voltage at instrument panel 10-pin harness connector terminal No. 9 on Forester, terminal No. 7 on Impreza and Outback Sport. See Fig 4. If voltage is more than 10 volts, go to next step. If voltage is not more than 10 volts, check condition of fuse No. 5 (No. 13 on Impreza and Outback Sport), check for open or short in power supply circuit between battery and instrument panel harness connector, and check for poor contact in all harness connectors between battery, ignition switch and instrument panel. See ENGINE PERFORMANCE in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair as required and retest system.
  6. Remove MIL bulb from instrument panel. Replace bulb if faulty. Repair instrument cluster connector if bulb is not faulty and retest system.
scientia non olet · About LEMON Manuals