2003 Nissan Altima S - Camshaft & Crankshaft Position Sensors
2003 Nissan Altima S 2.5L W/Automatic Transmission
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 ~$750.
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 ($44 us)
The old part numbers were encased in plastic. These part numbers should not be used: 23731-8J005 & 23731-8J006
FOR ONLINE PART PURCHASE:
"DIGITALDXING" PROVIDED THE LINKS LISTED BELOW AND POSTED SOME PICTURES (2003 NISSAN ALTIMA 2.5L)
"PAUL" POSTED HIS PICUTRES HERE (2002 NISSAN ALTIMA 2.5L)
"DENTNSHELL" POSTED HIS FIX HERE (2005 NISSAN ALTIMA 2.5L)
"MULEMAN" POSTED A GREAT STEP-BY-STEP WRITE UP WITH PICTURES HERE (2006 NISSAN ALTIMA 2.5L)
Thanks a bunch, muleman.
...ACTUALLY, THAT WHOLE THREAD AT NISSANCLUB.COM IS A GOOD READ.
Best Answer - Chosen by Voters
Nissan recalls that problem to reprogram the ECU. What happens the crank sensor electrical terminals seep oil into the crank sensors plug. The new metal crank sensors correct this problem. Location of this sensor on the back of the motor is difficult to change and you need gorrilia finger grip to depress the connector green lock and remove the sensor. Depending on your cars Vin# Recall Campaign # R0712 NHTSA# 07V-527. Hopefully your factory warranty replaces the sensor no charge 5yr/60,000 mile. The campaign only covers the ECM reprogram. The ECM reprogram makes both sensors act as one so either will allow the car to start. Stalling and not starting is a safety risk.
Nissan Master Technician (John Paul)
For some information on related DTC faults:
2003 Nissan Altima Front Brake Pad Replacement
In this video, I demonstrate how to replace the front brake pads in a 2003 Nissan Altima 2.5. The brake rotors are in very good condition and not warped, so replacement is not necessary.
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I am not responsible for any mishaps that may have occurred from following these procedures
Nissan CV axle or halfshaft replacement on the passenger side.
I replace a CV axle or halfshaft on the passenger side of a 1999 Nissan Altima.
Replacement of the CV axle went pretty smoothly. First of all getting the nut off of the axle is usually kind of tricky but if you have a cheater pipe for your ratchet or some impacts it's not too bad. I figured out that if you break the nut loose before you take the tire off it works really good. I usually just stand on the end of my cheater pipe until it breaks loose. Then getting the tie rod end off can be tricky too. However I have a special tie rod end puller and a pickle fork that can be used to do that job. I prefer to use the puller though because the pickle fork damages the boot on the tie rod end. Both tools can be purchased at Auto Zone, O'reilly's or Advance Auto for about 15 dollars a peice.
This Nissan CV axle on the passenger side is kind of different because it has what they call a carrier bearing. I guess since it's so long they had to put a bearing in the middle of it too. It's not bad though, it's only held on by 3 little bolts. Since it has the carrier bearing the CV axle doesn't snap into the transmission like most other cars. After the carrier bearing has been removed it slides in and out really easily.
Sometimes when you take the CV axle out some transmission fluid spills on the floor. This was not the case today since I had the car jacked up so high. When I was done I went ahead and checked the transmission fluid anyway.
Fit new brake pads and discs
Are your car's brake pads and discs worn? It's easy to save money by fitting new ones yourself. Haynes shows you how.
Tutorial on how to change brake pads on 2003 Honda Pilot
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Tutorial on how to change brake pads and rotors on 2003-2008 Honda Pilot. For 2001-2007 Acura MDX, this install is exactly the same. This how to is exactly the same for most other Honda's and Acura's as well and very similiar to many other import company cars.
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Nissan - How to replace valve cover gasket & tune-up.(2000 yr)Altima 2.4 Twin cam. Pt 2/2
replacing the valve cover gasket/seal on a 2.4 engine from Nissan Altima Sentra 240SX Stanza.WE are also performing a ignition Tune-Up,while in the process, we will Replace spark plugs, ignition wire, electrode rotor with cap and more.Application for model yr (1986-2004) Nissan. Many other four(4) cylinder are identical, you be the judge, and see if you car is in request of a FUEL-SAVER-SERVICE.