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• When Monitored: • Set Condition: Possible Causes (K41) O2 1/1 SIGNAL CIRCUIT SHORTED TO GROUND (K902) O2 1/1 RETURN CIRCUIT SHORTED TO GROUND (K41) O2 1/1 SIGNAL CIRCUIT SHORTED TO THE (K902) O2 1/1 RETURN CIRCUIT (K41) O2 1/1 SIGNAL CIRCUIT SHORTED TO THE (Z916) GROUND CIRCUIT OXYGEN SENSOR 1/1 POWERTRAIN CONTROL MODULE (PCM) Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. OXYGEN SENSOR 1/1 VOLTAGE Start the engine and allow it to reach normal operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands Is the voltage less than 2.52 volts? Yes >> Go to 2 No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) 2. (K41) O2 1/1 SIGNAL CIRCUIT VOLTAGE Turn the ignition off. Disconnect the Oxygen Sensor 1/1 harness connector. Turn the ignition on. With a scan tool, monitor the Oxygen Sensor 1/1 voltage. Is the Oxygen Sensor 1/1 voltage above 4.8 volts? Yes >> Go to 3 No >> Go to 5 PM ENGINE ELECTRICAL DIAGNOSTICS - GPEC 9 - 135 |