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6. (K299) O2 SENSOR 1/2 HEATER CONTROL CIRCUIT OPEN Turn the ignition off. Measure the resistance of the (K299) O2 Sensor 1/2 Heater Control cir- Is the resistance below 5.0 ohms? Yes >> Go To 7 No >> Repair the open in the (K299) O2 Sensor 1/2 Heater Con- trol circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 7. (K904) O2 DOWN STREAM RETURN CIRCUIT Measure the voltage on the (K904) O2 Downstream Return circuit in the Is the voltage at 2.5 volts? Yes >> Check the fuel system for contaminants. Perform the POWERTRAIN VERIFICATION TEST. (Refer to No >> Check the (K904) O2 Downstream Return circuit for a short to ground, open, or short to voltage. Inspect the O2 Sensor Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - 538 ENGINE ELECTRICAL DIAGNOSTICS KJ |