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P0057-O2 SENSOR 2/2 HEATER CIRCUIT LOW (CONTINUED) 3. O2 SENSOR Ignition on, engine not running. With a scan tool, actuate the O2 Heater Test with the O2 Sensor har- Using a 12-volt test light connected to ground, probe the (K399) O2 Does the test light illuminate brightly and flash on and off dur- Yes >> Replace the O2 Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 4 4. (K399) O2 2/2 HEATER CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C3 PCM harness connector. Measure the resistance between ground and the (K399) O2 2/2 Heater Is the resistance below 5.0 ohms? Yes >> Repair the short to ground in the (K399) O2 2/2 Sensor Heater Control circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 5 9 - 44 ENGINE ELECTRICAL DIAGNOSTICS WK |