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1997 SVX

  1. Turn ignition switch to OFF position. Disconnect connector from TCM and connector from transmission. Measure resistance between TCM connector B68 and transmission connector. See Figure and Figure . Resistance between connector B68 terminal No. 13 and transmission connector terminal No. 2 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 transmission connector.
  2. Measure resistance between TCM connector B68 and transmission connector. Resistance between connector B68 terminal No. 10 and transmission connector terminal No. 4 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 transmission connector.
  3. Measure resistance between TCM connector B68 and ground. Resistance between connector B68 terminal No. 10 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 between TCM and transmission connector.
  4. Measure resistance between TCM connector B68 and ground. Resistance between connector B68 terminal No. 13 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 between TCM and transmission connector.
  5. Measure resistance between transmission connector receptacle and ground. See Figure. Resistance between connector receptacle terminal No. 4 and ground should be 0-1 ohm. If resistance is okay, go to next step. If resistance is not within specification, repair open in internal transmission harness between receptacle and shift solenoid No. 2.
  6. With transmission disconnected, measure resistance between transmission connector receptacle terminals No. 2 and No. 4. Resistance should be 20-32 ohms. If resistance is okay, go to next step. If resistance is not within specification, replace shift solenoid No. 2.
  7. Measure signal voltage output from TCM. Raise vehicle on hoist and secure with safety stand. Warm engine and transmission to operating temperature. Move shift selector lever to "D" position. Backprobe and measure signal voltage output from TCM connector B68 when engine is idling. See Figure. Voltage between connector B68 terminals No. 13 and No. 10 should be 10-14 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 TCM harness or connector. If voltage is not within specification, replace TCM and retest.
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