I have a 99 nissan altima and my snap on soltace gives me a code that the crank positioning sensor needs to be replaced. I have done that twice and also replaced the distributor and fuel pump. The car runs fine cold but when it starts to heat up it begins to run rough again and the same code shows up again.
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Code 11 crankshaft position sensor or Camshaft position sensor. Code 21, Ignition Signal, Diagnostic Tree . Best to take to dealer for repairs and to remove codes, the codes do not mean the units are faulty ,just there is a fault, could be just a bad connection.
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a crank position sensor , sends a signal to pcm about crankshaft position signal, the sensor controls spark timing and firing order. the signal is also used for pcm to detect a missfire!! it also sends this info to ignition module, any mechanic can replace a crankshaft sensor!! call a auto parts store and see if you can get one, the cost should be a lot less.
I would be leary of the crank position sensor as these pre OBDII types are mounted in theupper transaxle bell housing. I would check for diagnostic codes and possibly using a DVOM meter check for an A/C millivolt signal to be produced out of the sensor while cranking the engine.Codes 11 and/or 34 present could further support there are issues with this vital sensor needed to produce spark.
1st, Nissan had a recall on Crank position sensors for 2002-2006 Altima's. Check with you dealer before you go doing any repairs. You may discover you can get your car repaired at no charge. NHTSA Campaign ID number :O7V527000
Symptom: Erratic behavior. Stalling and no starts and very difficult to diagnose due to the time frame in which the component actually malfunctions. The warranty should not be limited to the original owner.
I would also need more specifics as to which engine you have so I might assist you in where the location of the sensor is. The Altima had a 4 and a 6 cyl engine offered that year.
I have 10 years experience in a Nissan dealership and I know without a shadow of a doubt that the Crankshaft Position Sensor is NOT located next tp the crank pulley... it is rather at the other end of the engine near where the transmission bellhousing bolts to the engine block. It is on the side toward the firewall near the bottom. Even if you can get the vehicle on a lift and get under it, you can't really see it... It's more of a feel thing... There was a campaign (recall) on these engines to replace Crank Position and also Cam Postion sensors. Check with your dealer- the campaign might be open. You will need your VIN number when you call.