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• When Monitored: • Set Condition: Possible Causes (K41) O2 1/1 SIGNAL CIRCUIT SHORTED TO VOLTAGE (K902) O2 1/1 RETURN CIRCUIT SHORTED TO VOLTAGE (K41) O2 1/1 SIGNAL CIRCUIT SHORTED TO THE (K99) O2 1/1 HEATER CONTROL CIRCUIT (K41) O2 1/1 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE (K902) O2 1/1 RETURN CIRCUIT OPEN OR HIGH RESISTANCE 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 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 greater than 3.9 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 SHORTED TO VOLTAGE Start the engine and allow it to idle. Disconnect the Oxygen Sensor 1/1 harness connector. Measure the voltage on the (K41) O2 1/1 Signal circuit in the Oxygen NOTE: Measure the voltage in reference to ground, not the (K902) Is the voltage above 5.2 volts? Yes >> Repair the (K41) O2 1/1 Signal circuit for a short to voltage. Perform the PCM Verification Test Ver. 1 (Refer to 9 - No >> Go to 3 PM ENGINE ELECTRICAL DIAGNOSTICS - GPEC 9 - 139 |