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| Updated: February 11, 2021 | |
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Chris' '90 Toyota
Celica All-Trac Turbo
(aka "The Shuttle") Autronic SMC Installation Details - Wiring |
O2 Sensor Wiring. Although I'm no longer using a stock Toyota O2 sensor, both my aftermarket and the Toyota sensor are both 4-wire, heated O2 probes. Two wires are for the internal 12 vdc heating element, and the other two wires return a voltage to the ECU which represents the quantity of oxygen in the exhaust. A lean incoming air/fuel ratio results in a high oxygen content in the exhaust. The opposite is also true with richer mixtures resulting in lower oxygen levels.
| O2 Sensor Wire | Purpose | Autronic SMC Connection |
| Black | Ground | Black - Ground |
| Red | +12 vdc | Brown - switched +12 vdc |
| White | ( + ) Sensor output | Blue, pin 7, "O2 Input" |
| Brown | ( - ) Sensor output | Black, pin 17, "Sensor GND" |
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Return to The Shuttle's Autronic EMS Wiring page |