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3. (K99) O2 1/1 HEATER CONTROL CIRCUIT HIGH RESISTANCE Disconnect the O2 harness connectors. With the scan tool, actuate the O2 Heater. Using a 12-volt test light connected ground, probe the (K99) O2 1/1 Heater Control circuit from the O2 harness NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connec- Does the test light illuminate brightly? Yes >> Go To 4 No >> Repair the excessive resistance in the (K99) O2 1/1 Heater Control circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 4. (Z904) O2 1/1 HEATER GROUND CIRCUIT HIGH RESISTANCE Using a 12-volt test light connected battery voltage, probe the (Z904) O2 Heater ground circuit in the O2 Sensor NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connec- Does the test light illuminate brightly? Yes >> Go To 5 No >> Repair the excessive resistance in the (Z904) O2 1/1 Heater ground circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 5. PCM NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal Were there any problems found? Yes >> Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Replace and program the Powertrain Control Module per Service Information. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 136 ENGINE ELECTRICAL DIAGNOSTICS LX |