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P0051-O2 SENSOR 2/1 HEATER CIRCUIT LOW (CONTINUED) For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON- For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes O2 HEATER TEST O2 SENSOR HEATER ELEMENT (K343) FUSED ASD RELAY OUTPUT CIRCUIT (K199) HEATER CONTROL CIRCUIT OPEN (K199) HEATER CONTROL CIRCUIT SHORTED TO GROUND PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - 1. O2 HEATER TEST Ignition on, engine not running. With the scan tool, read DTCs and record the related Freeze Frame data. With the scan tool, actuate the O2 Heater test. Monitor the O2 Heater Voltage for 5 minutes. Did the voltage drop down close to zero during the Heater test? Yes >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 2 NOTE: Stop the actuation before continuing. 9 - 1502 ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10 DR/DH |