2003 Nissan Altima S 2.5LW/Automatic Transmission PROBLEM: INTERMITTENT NO-STARTS & ROUGH-STARTS WITH NO DTCs SET. A LOCAL AUTOSHOP HAD REPLACED ONLY THE CAMSHAFT POSITION SENSOR, MADE SURE NO DTCs PRESENT AND OPS CHECK GOOD. HOWEVER, THE PROBLEM RETURNED. NOW, THE SAME AUTOSHOP BELIEVES THAT THE FAULT IS WITH THE TRANSMISSION FLEX PLATE, WHICH MAY HAVE DAMAGED THE CRANKSHAFT POSITION SENSOR AS WELL, ACCORDING TO HIM. ESTIMATE IS AT ~0. The mechanic didn't try to replace the Crankshaft sensor alone, he went straight for the Tranny drop. I figured go with the cheap fix first. If it comes back, then we will look into the Flex Plate. I replaced the recently replaced Camshaft sensor & the never been replaced Crankshaft sensor. So far, so good. Replacing the Camshaft sensor is a 2-minute job. The Crankshaft sensor will likely take 30 times as long. It seems like the Old Crankshaft Position sensor I removed was a bit high on a resistance check, when compared to brand new sensors. With too high a resistance value, the sensor may not make use of the full voltage it is receiving and/or it may not return the required amount of voltage to the Powertrain Control Module (PCM), which will lead to irregular engine operation or a no-start condition. Both Camshaft & Crankshaft sensors are the same part number. The 3rd version of the sensor is encased in metal, not plastic. The OEM part number is 23731-6N21A ( us) The old part numbers were encased in plastic. These part numbers ...
Keywords: 2003 NISSAN ALTIMA S, NISSAN ALTIMA S, ALTIMA, NISSAN ALTIMA, 2.5L, QR25DE, SEDAN, NISSAN, CRANKSHAFT, CRANKSHAFT POSITION, SENSOR, CAMSHAFT, CAMSHAFT POSITION, RECALL, NO START, ROUGH START, ENGINE, ROUGH IDLE, ROUGH, START, CSS1464, BWD, SU6364, DURALAST, 23731V, 23731-8J005, 237318J005, 23731-8J006, 237318J006, 23731-6N21A, 237316N21A, FLEX PLATE, TRANSMISSION, AUTOMATIC, P0340, P0335, P0385, RESISTANCE, STALL, MAGNET SENSOR, ASSY, ASSEMBLY
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