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3. (K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance of the (K99) O2 1/1 Heater Control circuit Is the resistance below 5.0 ohms? Yes >> Go to 4 No >> Repair the (K99) O2 1/1 Heater Control circuit for an open circuit or high resistance. Perform the PCM Verification Test Ver. 1 (Refer to 9 - 4. OXYGEN SENSOR 1/1 Connect the Powertrain Control Module (PCM) connector. Turn the ignition on. With the scan tool, actuate the Oxygen Sensor 1/1 control to the ON Using a 12 volt test light connected to ground, check the (K99) O2 1/1 NOTE: The test light should be illuminated and bright. Compare Using a 12 volt test light connected to ground, check the (K99) O2 1/1 NOTE: The test light should not be illuminated. Is the test light illuminated and bright with the actuator ON (100%) and not illuminated with the actua- Yes >> Replace the Oxygen Sensor 1/1 in accordance with the Service Information. Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING). No >> Go to 5 PM ENGINE ELECTRICAL DIAGNOSTICS - GPEC 9 - 43 |