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you may have a problem with the clock spring or spiral cable as nissan calles it. it is a part of the air bag system and also horn signal runs into and out of it.if that part is bad, your air bag light will flash and your horn will not work. has anyone been doing any repairs inside of the steering wheel?? it may just be unpluged. if you are going to tackle this your self to look inside of the steering wheel, make sure you disconnect the battery for at least 3 minutes, befor you start playing with the air bag. you dont want to blow it up.
This is normally caused by the Crank Sensor. The Engine Speed signal is given by the Crank sensor, not the vehicle speed sensor. Most people get confused and replace the speed sensor instead.
So to resolve your problem you will need to replace the crank sensor. The engine speed sensor code is always related to the crank sensor failure.
The P0725 Codes is triggered when TCM does not receive the engine speed signal from ECM.
The Engine Control Module (ECM) monitors the engine speed through the
Crankshaft Position (CKP) sensor with the engine running, and send
signal to the Transmission Control Module (TCM).
Symptoms: - Engine Light ON (or Service Engine Soon Warning Light)
Possible causes: - Open or shorted CKP sensor circuit condition - Poor CKP sensor electrical connection - Check communication error between the ECM and TCM - Failed CKP Sensor
Possible solution: Very common problem with Nissan vehicles, usually replacing the Crankshaft Position sensor takes care of the problem.
If it has a code for loosing the crankshaft position sensor signal, I would certainly start looking at that before venturing into the fuel system. Cam and Crank sensors are a common failure item for Nissans of that era. Nissan actually redesigned the sensor and i think they performed a recall on some vehicles. They are fairly inexpensive and easy to replace. I believe they run about $40 each. Because most people don't have access to a powerful scanner or a digital storage oscilloscope to verify the failure I recommend replacing the cam and crank sensors at the same time.
what is getting power and whats not? headlights work? horn? turn ignition switch on. lights on dash light up? crank car, cranks? no crank? cranks but wont run? ck eng light comes on when key on? clicks when turning ket to crank?
there is currently a recall being performed on altimas and there is also a updated crank position sensor check with your dealer for open recalls on your vehicle (its just a phone call away have your vin # ready (located on left bottom of windshield if your facing it from in front of vehicle it is on lower right side of windshield - also look on driver door jamb.
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