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UPSTREAM OXYGEN SENSOR The input from the upstream heated oxygen sensor tells the PCM the oxygen content of the exhaust gas. The sensor input switches from 0 to 1 volt, depend- ing upon the oxygen content of the exhaust gas in The heating element in the sensor provides heat to the sensor ceramic element. Heating the sensor In Closed Loop, the PCM adjusts injector pulse width based on the upstream heated oxygen sensor DOWNSTREAM OXYGEN SENSOR The downstream heated oxygen sensor input is used to detect catalytic convertor deterioration. As REMOVAL 8.3L - UPSTREAM 1/1, 2/1 (1) Raise and support vehicle. nector (Fig. 17). (3) Remove sensor using an oxygen sensor crow foot wrench such as Snap-On tool YA8875 or equiva- 8.3L - DOWNSTREAM 1/2, 2/2 (1) Raise and support vehicle. nector (Fig. 17). (3) Remove sensor using an oxygen sensor crow foot wrench such as Snap-On tool YA8875 or equiva- INSTALLATION 8.3L - UPSTREAM 1/1, 2/1 (1) After removing the sensor, the exhaust mani- fold threads must be cleaned with an 18 mm X 1.5 + t 771- 64 or equivalent. New sensors have compound (2) Install sensor using an oxygen sensor crow foot wrench such as Snap-On tool YA8875 or equivalent (3) Tighten the sensor to 27 N·m (20 ft. lbs.) torque. (4) Plug sensor connector. 8.3L - DOWNSTREAM 1/2, 2/2 (1) After removing the sensor, the threads must be cleaned with an 18 mm X 1.5 + 6E tap. If reusing the t 771- 64 or equiva- lent. New sensors have compound on the threads and (2) Install sensor using an oxygen sensor crow foot wrench such as Snap-On tool YA8875 or equivalent (3) Tighten the sensor to 27 N·m (20 ft. lbs.) torque. (4) Plug sensor connector. Fig. 17 2/1, 2/2, O2 SENSORS (Right Side) 1 - Upstream O2 Sensor 14 - 38 FUEL INJECTION ZB O2 SENSOR (Continued) |