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P0155-O2 SENSOR 2/1 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 O2 Heater Element across the O2 Sensor connector between the O2 Heater Control 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. (K199) O2 2/1 HEATER CONTROL CIRCUIT OPEN Disconnect the C2 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 (K199) O2 2/1 Heater Control circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer 9 - 204 ENGINE ELECTRICAL DIAGNOSTICS WK |