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P0161-O2 SENSOR 2/2 HEATER PERFORMANCE (CONTINUED) 2. O2 SENSOR HEATER ELEMENT Turn the ignition off. NOTE: Allow the O2 sensor to cool down to room temperature. Measure the resistance of the 2/2 O2 Heater Element, between the O2 Heater Control terminal and the O2 Heater NOTE: O2 Heater Element resistance values should be measured at 70°F (21.1°C). The resistance value will Is the resistance of the O2 Sensor Heater Element between 2.0 and 30.0 ohms? Yes >> Go To 3 No >> Replace the O2 Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 3. (K399) O2 2/2 HEATER CONTROL CIRCUIT OPEN Disconnect the C3 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing Is the resistance below 0.5 of an ohm? Yes >> Go To 4 No >> Repair the excessive resistance in the (K399) O2 2/2 Heater Control circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer 9 - 226 ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L DR/DH |