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P0058-O2 SENSOR 2/2 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 (K399) O2 2/2 HEATER CONTROL CIRCUIT OPEN (Z992) O2 2/2 HEATER GROUND CIRCUIT OPEN (K399) O2 2/2 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 the 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, between the O2 Heater Control terminal and the O2 NOTE: O2 Heater Element resistance values should be measured at 70°F (21.1°C). The resistance value will Is the O2 Sensor Heater Element resistance between 2.0 and 30.0 ohms? Yes >> Go To 3 No >> Replace the O2 Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 47 |