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FUEL LEVEL SENSOR—PCM INPUT DESCRIPTION The fuel gauge level sending unit is attached to the fuel pump module. OPERATION The fuel level sensor (fuel gauge sending unit) sends a signal to the PCM to indicate fuel level. The HEATED OXYGEN SENSORS—PCM INPUT DESCRIPTION The upstream oxygen sensor threads into the out- let flange of the exhaust manifold (Fig. 3) or (Fig. 4). The downstream heated oxygen sensor threads into the outlet pipe at the rear of the catalytic convertor OPERATION As vehicles accumulate mileage, the catalytic con- vertor deteriorates. The deterioration results in a the upstream heated oxygen sensor input when When the catalytic converter efficiency drops below emission standards, the PCM stores a diagnostic The automatic shutdown relay supplies battery voltage to both the upstream and downstream heated Fig. 2 Engine Coolant Temperature Sensor—2.5L 1 – COOLANT FILL NECK Fig. 3 Oxygen Sensor 1/1 Upstream—2.0/2.4L Engines 1 – OXYGEN SENSORS Fig. 4 Oxygen Sensor 1/1 Upstream—2.5L 1 – CATALYTIC CONVERTOR JX FUEL SYSTEM 14 - 27 DESCRIPTION AND OPERATION (Continued) |