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P0038-O2 SENSOR 1/2 HEATER CIRCUIT HIGH (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes (K299) O2 1/2 HEATER CONTROL CIRCUIT OPEN (Z42) O2 1/2 HEATER GROUND CIRCUIT OPEN (K299) O2 SENSOR 1/2 HEATER CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE O2 SENSOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. ACTIVE DTC Ignition on, engine not running. With a scan tool, read DTC’s. Is the DTC active at this time? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. O2 HEATER ELEMENT Turn the ignition off. NOTE: Allow the O2 Sensor to cool down to room temperature. Measure the resistance across the O2 Sensor Heater element, NOTE: O2 Heater Element resistance values should be measured Is the O2 Sensor Heater Element resistance between 2.0 and Yes >> Go To 3 No >> Replace the O2 Sensor. Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 9 - 26 ENGINE ELECTRICAL DIAGNOSTICS ND |