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air entering the outer end of snorkel is 60°C (140°F.) or (4) Remove the air cleaner from the engine and allow it to cool down to 46°C (115°F). With 20 inches of (5) To test the diaphragm, apply 20 inches of vacuum to it with vacuum pump tool number C-4207 or equiva- (6) If the vacuum diaphragm does not perform ad- equately, replace the heated air assembly. (7) If the vacuum diaphragm performs adequately but proper temperature is not maintained, replace the HEATED AIR TEMPERATURE SENSOR SER- REMOVAL (1) Remove air cleaner housing from vehicle. sensor. Remove and discard retainer clips, new clips (3) Remove and discard sensor and gasket. INSTALLATION (1) Position gasket on the sensor. Install sensor (Fig. 5). (2) While supporting the sensor on outer diameter, install new retainer clips securely. Ensure the gasket HEATED OXYGEN SENSOR (O 2 SENSOR) The O 2 sensor threads into the exhaust manifold. It provides an input voltage to the powertrain control The O 2 sensor produces voltages from 0 to 1 volt, depending upon the oxygen content of the exhaust gas Fig. 3 Testing Vacuum Diaphragm on Heated Air In- let Systems Fig. 4 Removing Sensor Clips Fig. 5 Air Temperature Sensor Installation 25 - 18 EMISSION CONTROL SYSTEMS Ä |