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. Disconnect appropriate ECM harness connector. Using DVOM, measure resistance between terminal NCO+ and terminal NCO- at ECM connector. See WIRING DIAGRAMS . Resistance should be 560-680 ohms. If resistance is within specification, replace ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. If resistance is not within specification, go to next step.
- Remove O/D direct clutch speed sensor from transmission. Measure resistance between sensor terminals. Resistance should be 560-680 ohms. If resistance is not as specified, replace sensor. If resistance is as specified, check and repair circuits between sensor and ECM.
- Check voltage between sensor terminals when a magnet is put close to tip of speed sensor. See Fig 1. If a low intermittent voltage is generated, sensor is okay. If no voltage is generated, replace speed sensor.