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3. (K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the Powertrain Control Module (PCM) connector. Measure the resistance between ground and the (K99) O2 1/1 Heater Is the resistance below 100 ohms? Yes >> Repair the (K99) O2 1/1 Heater Control circuit for a short to ground. Perform the PCM Verification Test Ver. 1 (Refer to 9 - No >> Go to 4 4. (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 5 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 - 5. 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 with the con- Using a 12 volt test light connected to ground, check the (K99) O2 1/1 NOTE: The test light should not be illuminated with the control Is the test light illuminated and bright with the control actuated ON and not illuminated with the control PM ENGINE ELECTRICAL DIAGNOSTICS - GPEC 9 - 39 |