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O/D Main Switch: 4Runner

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Toyota Tundra, 2002 Toyota Tacoma, 2002 Toyota Sequoia, 2002 Toyota 4Runner, and 2001 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check operation of O/D main switch. Turn ignition on. Depress O/D main switch to ON position. O/D OFF indicator will illuminate. Press O/D main switch again (OFF position). O/D OFF indicator will go off. If indicator does not operate correctly, go to next step. If indicator operates correctly and you were directed here for a 3-4 shift concern, perform OVERDRIVE CANCEL SIGNAL  test. If indicator operates correctly and you were directed here for any other concern, substitute with known good ECM and retest.
  2. Remove instrument cluster and inspect O/D OFF indicator circuits and bulb. Repair or replace instrument cluster as needed. If instrument cluster O/D OFF indicator circuits and bulb are okay, go to next step.
  3. Turn ignition off. Disconnect O/D main switch 10-pin connector. Check continuity between O/D main switch connector terminals No. 5 and 10. See Figure. Continuity should exist with O/D main switch depressed, and continuity should not exist with O/D main switch released. If continuity is not as specified, replace O/D main switch. If continuity is as specified, go to next step.
  4. Turn ignition on. Access ECM. See Figure. Using DVOM, measure voltage by backprobing between ground and specified ECM connector ODMS terminal. See WIRING DIAGRAMS . Voltage should be less than 1.5 volts with O/D main switch depressed, and 10-14 volts with O/D main switch released. If voltage is as specified, replace ECM and retest. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. If voltage is not as specified, go to next step.
  5. Turn ignition off. Disconnect appropriate ECM connector. See Figure. Using DVOM, measure voltage between ground and specified ECM connector ODLP terminal. If voltage is less than 3 volts with O/D main switch pressed continuously and 9-14 volts with switch released, replace ECM and retest. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. If voltage is not as specified, inspect and repair circuit between instrument cluster and ECM, O/D main switch and ECM, or O/D main switch and ground.
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