Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect VVT sensor harness connector. Using ohmmeter, measure resistance between sensor terminals. Resistance should be 835-1400 ohms at 14-122°F (-10-50°C) or 1060-1645 ohms at 122-212°F (50-100°C). Check resistance at each VVT sensor.
Check the output waveform. See Fig 1 - Fig 3 .

Fig 1: Identifying Camshaft Position (CMP) Sensor ECM Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Camshaft Position (CMP) Sensor Testing Chart

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Identifying Camshaft Position (CMP) Sensor Waveform

Replace sensor(s) as necessary. If sensor(s) is okay, check for open or short circuit in wiring harness between ECM and VVT sensor. See WIRING DIAGRAMS article. Repair as necessary. If wiring harness is okay, remove and inspect sensor(s). Also inspect signal plate. Replace as necessary. If both components are okay, replace ECM and retest system.