Diagnostic Procedure
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.
- Ensure ignition is off. Access ECM. See Figure-Figure . Disconnect appropriate ECM connector. Measure resistance between ground and terminal S1 and/or S2 at ECM connector. See appropriate ECM PIN VOLTAGE TABLE under PIN VOLTAGE TESTS . If resistance is 11-15 ohms at 68°F (20°C), replace ECM and retest. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. If resistance is not within specification, go to next step.
- Disconnect transmission solenoid connector. See Fig 1. Check continuity between terminal S1 and/or S2 of transmission solenoid connector and corresponding terminal of ECM. See appropriate ECM PIN VOLTAGE TABLE under PIN VOLTAGE TESTS . See Fig 3 and Fig 2 . If continuity exists for all circuits, go to next step. If continuity does not exist for any circuit, inspect and repair circuit(s) as needed.
- Measure resistance between transmission solenoid connector (component side) terminal S1 and/or S2 and ground. See Fig 3 and Fig 2 . If resistance is 11-15 ohms at 68°F (20°C), replace solenoid. See appropriate SERVICING article. If resistance is not as specified, inspect transmission wiring harness. Replace as needed. If harness is okay, replace suspect solenoid.