2003 Nissan Altima S - Camshaft & Crankshaft Position Sensors
2003 Nissan Altima S 2.5L W/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 ~$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:
http://www.nissanpartszone.com/components/2003-nissan-altima_engine-control-module-226-12.html
"DIGITALDXING" PROVIDED THE LINKS LISTED BELOW AND POSTED SOME PICTURES (2003 NISSAN ALTIMA 2.5L)
http://x.nissanhelp.com/forums/members/digitaldxing-albums-2003-nissan-altima-crankshaft-position-sensor-picture331-2003-nissan-altima-crankshaft-position-sensor.html#picturecomment_19
"PAUL" POSTED HIS PICUTRES HERE (2002 NISSAN ALTIMA 2.5L)
http://www.paulstravelpictures.com/Nissan-Altima-Camshaft-Crankshaft-Sensors/
"DENTNSHELL" POSTED HIS FIX HERE (2005 NISSAN ALTIMA 2.5L)
http://dentnshell.com/Projects/2005Altima/CamkPosition.html
"MULEMAN" POSTED A GREAT STEP-BY-STEP WRITE UP WITH PICTURES HERE (2006 NISSAN ALTIMA 2.5L)
http://www.nissanclub.com/forums/f-q-2002-2006/286857-diy-crankshaft-position-sensor-cps-2006-2-5-altima.html
Thanks a bunch, muleman.
...ACTUALLY, THAT WHOLE THREAD AT NISSANCLUB.COM IS A GOOD READ.
Yahoo! Answers
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.
Source(s):
Nissan Master Technician (John Paul)
http://answers.yahoo.com/question/index?qid=20080402214141AA7yQjR
For some information on related DTC faults:
http://www.obd-codes.com/p0340
http://www.obd-codes.com/p0335
http://www.obd-codes.com/p0385
CAM and CRK & Wiring Diagrams
CAM and CRK & Wiring Diagrams
Amazon Printed Books
https://www.createspace.com/3623928
Amazon Kindle Edition
http://www.amazon.com/Automotive-Electronic-Diagnostics-Course-1-ebook/dp/B0052MCTRI/ref=sr_1_1?s=digital-text&ie=UTF8&qid=1360015586&sr=1-1&keywords=electronics+1%2C+mandy+concepcion
Android APPs
https://play.google.com/store/apps/details?id=com.app.book.AOTLXEBCBQELJLABI&feature=search_result#?t=W251bGwsMSwxLDEsImNvbS5hcHAuYm9vay5BT1RMWEVCQ0JRRUxKTEFCSSJd
This video is dedicated to CAM and CRK sensor testing and operational parameter, but from an electrical and wiring diagram interpretation point of view. The CAM and CRK sensors are types of speed sensors. There are variations of each and these varieties will dictate the way you test the sensor. Explained here are specific electrical values, such as voltage signals and how the sensor is connected to the ECM itself. This is vital information since most of the diagnostic time is spent in analyzing the wiring diagrams for the component in question.
Presented here using the latest CG and graphic animation technology. Part of our wiring diagram set of videos shown here on this channel. Enjoy...
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How to Test Crankshaft and Camshaft Sensors 2
How to Test Crankshaft and Camshaft Sensors 2
Amazon Printed Books
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http://www.amazon.com/Automotive-Testing-Diagnostic-Strategies-ebook/dp/B0052YFOCI/ref=sr_1_2?s=digital-text&ie=UTF8&qid=1360016628&sr=1-2&keywords=sensor+testing%2C+mandy+concepcion
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Shows the testing procedures for automotive speed sensors. Video 2 of 2. (note: We allow all schools and training institutions to use our software free of charge, so long as it is not sold to others. You're encouraged to download our free automotive simulation software.
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Camshaft Positioning Sensor Replacement - Nissan Altima - P0725 / P0335 - Save $$$, DIY.
Camshaft Position Sensor replacement on 2003 Nissan Altima 2.5 SL.
I had error codes P0725 and P0335 - related to crankshaft positioning sensor, but decided to replace this one as well.
I also posted another video how to replace crankshaft position sensor as well.
You can find it on my Youtube channel.
Save money $$$! Do It Yourself!
Hidden Nissan Crank Sensor
The crank sensor on a nissan is hidden. It isn't all that hard to replace once you find it. Here are the details.
Crank Sensor Operation
Crank Sensor Operation
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Android APPs
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IMPORTANT: The crank sensor input signal is the most important signal in a modern vehicle. Without it the engine will not start. The crank sensor measures crankshaft position and rate of change. The ECM then synchronizes this signal to the CAM sensor and determines injection pulse, timing, fuel delivery, idle speed and everything else needed to run the engine. Learn how this component works and how to test it. (note: We allow all schools and training institutions to use our software free of charge, so long as it is not sold to others. You're encouraged to download our free automotive simulation software for more information.
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CAM or Camshaft Position Sensor Testing
CAM or Camshaft Position Sensor Testing
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Amazon Kindle Edition
http://www.amazon.com/Automotive-Testing-Diagnostic-Strategies-ebook/dp/B0052YFOCI/ref=sr_1_2?s=digital-text&ie=UTF8&qid=1360016628&sr=1-2&keywords=sensor+testing%2C+mandy+concepcion
Android APPs
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The CAM sensor or camshaft position sensor's role is to signal the ECM the camshaft position. The crank and cam sensor operate in sync with each other. Without the CAM sensor the vehicle may not even start and cause hard starting. The CAM sensor is mostly used to determine which injector to fire in a sequential system and for COP or coil on-plug ignition systems coil firing event.
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Amazon Printed-Books & Kindle:
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Google Play Android APPs:
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Apple iTunes iPad:
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Replacing Engine Sensors
Time to replace the crank and cam engine sensors and re assemble most of the Exhaust. Gettin her back in shape.
03' ALTIMA 2.5S, engine shot due to Pre-Cat b
3/10/09 rebuild finished check it out at
http://www.cardomain.com/ride/3201874/2003-nissan-altima
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My 03 Altima 2.5 e
Nissian Altima Header Replacement
Replacement of header on 2002-2004 Nissian Altima due to recall on precat for these models. The precat breaks down and begins to allow debris to flow into the motor which will destroy the motor. Detail description of the steps need to convert to new header and avoid such devestation.
