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• When Monitored: • Set Condition: Possible Causes INTERMITTENT DTC EXHAUST LEAK (K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO VOLTAGE (K904) O2 1/2 RETURN CIRCUIT SHORTED TO VOLTAGE (K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO THE (K904) O2 1/2 RETURN CIRCUIT (K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO GROUND (K904) O2 1/2 RETURN CIRCUIT SHORTED TO GROUND (K141) O2 1/2 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE (K904) O2 1/2 RETURN CIRCUIT OPEN OR HIGH RESISTANCE OXYGEN SENSOR 1/2 POWERTRAIN CONTROL MODULE (PCM) Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. EXHAUST LEAK NOTE: A thorough exhaust leak test must be completed before removing an O2 Sensor or any other part NOTE: An exhaust leak may cause downstream fuel adaptives to rail out, resulting in a false 1/1 O2 Sensor Inspect the exhaust system for leaks between the engine and the 1/1 Oxygen Sensor. Perform a leak test with Miller Tool #8404A Evaporative Emissions Leak Detector (EELD), even if an audible leak is Connect the SMOKE supply tip (black hose) to the exhaust cone adapter (if equipped) and place it into the tail pipe. Set the smoke/air control switch to SMOKE. Press the remote smoke/air start button. While still holding the remote smoke/air start button, use the white light (#8404-CLL) to follow the exhaust system If a leak is concealed from view, release the remote smoke/air start button, and use the ultraviolet (UV) black light PM ENGINE ELECTRICAL DIAGNOSTICS - GPEC 9 - 739 |