Speed Sensor Circuit
- Check for fluctuation of speedometer while driving at a steady speed. If speedometer fluctuates, speedometer cable might be faulty or dry. If speedometer does not fluctuate, turn ignition off. Disconnect speed sensor connector.
- Check for continuity between body ground and terminal B with analog gauges, terminal A9 with digital gauges. See Fig 1.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- If no continuity is present, check for open between terminal and body ground. If continuity is present, verify that there is continuity between connectors A and B (analog) or between terminals A9 and A11 (digital) four times per sensor revolution. If speed sensor is not operating properly, replace sensor. If sensor is operating properly, disconnect computer connector.
- Check for continuity between terminal A (analog), or terminal A11 (digital), and terminal 7 of computer.
- If no continuity is present, check for open between appropriate terminal of speed sensor and terminal 7 of computer. If continuity is present, replace cruise control computer.