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1997 SVX

  1. Turn ignition switch to OFF position, and disconnect connectors from TCM and ECM. Measure resistance between TCM harness connector B67 terminal No. 9 and ECM B59 connector terminal No. 16. Resistance 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 harness connector B67 terminal No. 9 and ground. Resistance 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. Check input signal for TCM. Reconnect connectors to TCM and ECM. Warm up engine to operating temperature. Backprobe and measure signal voltage between TCM connector B67 and ground. Voltage between TCM connector B67 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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