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P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW (CONTINUED) 3. O2 SENSOR Ignition on, engine not running. With a scan tool, actuate the O2 1/1Heater Test with the O2 Sensor Using a 12-volt test light connected to ground, probe the (K99) O2 1/1 Does the test light illuminate brightly and flash on and off dur- Yes >> Replace the O2 Sensor. Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 No >> Go To 4 4. (K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K99) O2 1/1 Heater Is the resistance below 5.0 ohms? Yes >> Repair the short to ground in the (K99) O2 1/1 Heater Control circuit. Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 No >> Go To 5 9 - 14 ENGINE ELECTRICAL DIAGNOSTICS ND |