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Home >> Subaru >> 1997 >> Legacy Outback Limited, Automatic >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - 4-Speed - With 2-Digit DTCS >> Diagnostic Tests >> DTC 22: Mass Air Flow Signal >> 1997 Legacy

1997 Legacy

  1. Turn ignition switch to OFF position. Disconnect connectors from TCM and ECM. Measure resistance between TCM connector B54 and ECM B84 connector. Resistance between connector B54 terminal No. 9 and B84 connector terminal No. 35 should be 0-1 ohm. If resistance is okay, go to next step. If resistance is not within specification, repair open in harness between TCM and ECM.
  2. Measure resistance between TCM connector B54 and ground. Resistance between connector B54 terminal No. 9 and ground should be more than 100 k/ohms. If resistance is okay, go to next step. If resistance is not within specification, repair short to ground in harness between TCM and ECM.
  3. Connect connectors to ECM and TCM. Warm-up engine and transmission to operating temperature. ATF temperature must be above 176° F (80° C). With engine idling, back probe and measure voltage between TCM connector B54 terminal and ground. Voltage between connector B54 terminal No. 9 and ground should be .5-1.2 volts. If voltage is okay and AT OIL TEMP light illuminates, concern is intermittent and circuit has returned to normal condition. A temporary poor contact of connector or harness may be cause. Repair harness to, or connector in TCM or ECM. If voltage is not within specification, go to next step.
  4. Check for poor contact in mass air flow sensor signal circuit. If contact is poor, repair as necessary. If contact is okay, replace TCM and retest.
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