Hello, I have a 2002 Nissan Altima 4cyld. 2.5 engine that wont start up. Firestone stated need a new camshaft position sensor pigtail wire connector due to the end of pigtail broke. I was told that I could have them spliced together if I found one @ a junk yard. It seems to be hard to find that connector is there any other car make that uses the same type of connector that I could use on my 2002 altima ? Do you have any advice as well? Thanks in advance

6. CHECK CKP SENSOR (POS) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 14 and CKP sensor (POS) terminal 2.continuity should exist. Refer to Wiring Diagram. 3. Also check harness for short to ground and short to power. OK or NG OK >> GO TO 7. NG >> Repair open circuit or short to ground or short to power in harness or connectors. 7. CHECK CRANKSHAFT POSITION SENSOR (POS) Refer to EC-326, "Component Inspection" . OK or NG OK >> GO TO 8. NG >> Replace crankshaft position sensor (POS). 8. CHECK GEAR TOOTH Visually check for chipping signal plate gear tooth. OK or NG OK >> GO TO 9. NG >> Replace the signal plate. 9. CHECK INTERMITTENT INCIDENT Refer to EC-147, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" . >> INSPECTION END Component Inspection UBS002UJ CRANKSHAFT POSITION SENSOR (POS) 1. Loosen the fixing bolt of the sensor. 2. Disconnect crankshaft position sensor (POS) harness connector. 3. Remove the sensor. 4. Visually check the sensor for chipping.

Trouble Code: P0340

Camshaft Position (CMP) Sensor Circuit

Possible Causes:

The following conditions may cause this DTC to set:


Incorrect harness routing near secondary ignition componentsIgnition coil arcing to wiring harness or ignition control (IC) module--Inspect the ignition coils for cracks, carbon tracking, or other signs of damage.Camshaft reluctor wheel damageThe sensor coming in contact with the reluctor wheelForeign material passing between the sensor and the reluctor wheelExcessive camshaft end-play

Trouble Code: P0340

Camshaft Position (CMP) Sensor Circuit

Possible Causes:


Inspect the 16-way engine harness to fuel injector harness connector, the CMP sensor connector, and the ECM connector for corrosion.With a DTC set, the engine may crank for an extended period of time at start-up.

If you turn the key and the starter motor makes the engine revolve then it is cranking or turning over. If that is all that it does then it is not starting. They are two different situations. I hope that you did not replace the "crank" as you stated it was a sensor issue. The problem with a diagnostic code is there is a piece that activates that sensor and that piece can be the problem. The codes are the same whether it is the sensor or the tone ring. Also there is a gap specification between the sensor and the tone ring. If it is too far away, the sensor wont see the magnet.

Hi got a Nissan almera 2002 1.5 it won't start it try's to but cuts off it brings code air mass flow I have changed that but still wnt start

begin troubleshoot your car to the fuel system, does the fuel goes to fuel rail, check the fuel pressure, does it pressurized? if no pressure check the fuel pump or fuel itslf,check the fuse of injectors and coils, also the coil ground, if all ok, try to remove one spark plug wire and observe the high voltage drop while crunking the engine, if spark is ok and fuel is ok, it engine timing problem, if no spark check ignition system voltage on and grounding, if voltage ok, but no spark, check the crankshop position sensor and camshaft sensor.

p0335 refer to camshaft position sensor circuit
p0725 refer to engine speed circuit , check the camshaft pos. sensor wires, plug or replace the sensor

REMOVAL & INSTALLATION

1. Start the engine and allow it to reach normal operating temperature, then turn the ignition switch OFF.
2. Disconnect the negative battery cable.
3. Open the hood and locate the Oxygen (O2S) sensor connector. It may be necessary to raise and safely support the vehicle for access to the sensor and its connector. NOTE: On a few models, it may be necessary to remove the passenger seat and lift the carpeting in order to access the connector for a downstream O2S sensor.
   
4. Disengage the O2S sensor pigtail connector from the vehicle harness connector. NOTE: There are generally 2 methods used to mount an O2S sensor in the exhaust system: either the O2S sensor is threaded directly into the exhaust component (screw-in type) or the O2S sensor is retained by a flange and 2 nuts or bolts (flange type). WARNING
   To prevent damaging a screw-in type O2S sensor, if excessive force is needed to remove the sensor lubricate it with penetrating oil prior to removal. Also, be sure to protect the tip of the sensor. O2S sensor tips are very sensitive and may be easily damaged if allowed to strike or come in contact with other objects.
   
5. Remove the sensor, as follows:
   • Screw-in type sensors — O2S sensors are usually designed with a permanently attached wiring pigtail. This allows the wiring harness and sensor connectors to be positioned away from the hot exhaust system. It may be necessary to use a socket or wrench that is designed specifically for this purpose. Before purchasing such a socket, be sure that you can't save some money by using a box end wrench for sensor removal.
   • Flange type sensors — Loosen the hold-down nuts or bolts and pull the sensor out of the exhaust component. Be sure to remove and discard the old sensor gasket, if equipped. You will need a new gasket for installation.
6. Perform a visual inspection of the sensor. Black sooty deposits may indicate a rich air/fuel mixture, brown deposits may indicate an oil consumption problem, and white gritty deposits may indicate an internal coolant leak. All of these conditions can destroy a new sensor if not corrected before installation. To install:
   
7. Install the sensor, as follows: NOTE: A special anti-seize compound is used on most screw-in type O2S sensor threads, and is designed to ease O2S sensor removal. New sensors usually have the compound already applied to the threads. However, if installing the old O2S sensor or the new sensor did not come with compound, apply a thin coating of electrically-conductive anti-seize compound to the sensor threads. WARNING
   Be sure to prevent any of the anti-seize compound from coming in contact with the O2S sensor tip. Also, take precautions to protect the sensor tip from physical damage during installation.
   • Screw-in type sensors — Install the sensor in the mounting boss, then tighten it securely.
   • Flange type sensors — Position a new sensor gasket on the exhaust component and insert the sensor. Tighten the hold-down fasteners securely and evenly.
8. Reattach the sensor pigtail connector to the vehicle harness connector.
9. Lower the vehicle.
10. Connect the negative battery cable.
11. Start the engine and ensure no Diagnostic Trouble Codes (DTC's) are set.

Fig. 1: Since sensor locations vary between vehicles, the first step in removal is to locate the O2S sensors (arrows)...

Fig. 2: ... and the sensor connector (2), which is usually near the O2S sensor (1), but removed enough from the heat of the exhaust system

Fig. 3: Disengage the sensor pigtail connector half from the vehicle harness connector half

I am not sure where in a Sentra, but in a Quest 1993-02, it is in the distributor (integral). Common problem with Quest is that brown dust covers optical sensor under slotted wheel under rotor. If dust, the bearing is failing and you need new distributor. Clean optical sensor and see if it starts and runs. Get dist. on ebay.

report back on progress.

The camshaft position sensor is located on the timing cover, near the top of the motor. The crankshaft position sensor is located on the same timing cover near the crankshaft. Just a side note, more than likely the crankshaft position is your issue and it's under a recall from Nissan and they will replace it for free.