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P0037-O2 SENSOR 1/2 HEATER CIRCUIT LOW (CONTINUED) For the Engine circuit diagrams (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 SHORTED TO GROUND O2 SENSOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. O2 SENSOR HEATER OPERATION Turn the ignition off. NOTE: Wait a minimum of 8 minutes to allow the O2 Sensor to cool down before continuing the test. Allow With a scan tool, actuate the O2 1/2 Heater Test. With the scan tool, monitor 1/2 O2 Sensor voltage for at least 2 minutes. Does the O2 Sensor voltage stay above 4.5 volts? 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 - 22 ENGINE ELECTRICAL DIAGNOSTICS ND |