I have a 2006 Altima that won't start. Replaced battery and pos bat terminal. problem is intermitent, after replacing batt. it worked for 2 days. now it just cranks but doesn't start. checked fuses, gas cap, can hear fuel pump working, and have all lights. the service engine soon light came on after i changed the battery.

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.

#1 Check your ground or corrosion at battery terminals if OK try adding an additional ground strap or cable to body of vehicle make sure you clean surface that means remove paint where cable is grounded.

#2 If you have an aftermarket radio or sound system or anything aftermarket that is not original check that also.

Very important if terminals are not corroded splice both batt cables about 1" back and inspect under insulator for corrosion if there is any replace batt cables

are the inside of the battery terms dirty,corroided? do you know if motor alt is charging batt? how long did it run when you put new batt in? if it lasted about two days, its proubly not charging, also make sure nothing is being left on draining batt down, to check that, leave batt nuhooked pos side over night.

dew to starter motor negative cable that connects by a bolt through the gear box

or a dead short but this would blow fuse

terminal corrosion neads cleaning and when terminal is replaced cover terminal with grease or petrolium jelly

the alternator will not die in one day unless there is a direct short causing diode or coil winding failure which would give signs of smell, melted wires. Disconnect battery and give full charge. what year is this? while vehicle is running you should be able to briefly disconnect positive battery post connection and vehicle will still run if alternator is good. For a new battery to die in one day, one of two things i think has happened. Either the batt is faulty from supplier,( not likely but i have seen it ) or there is a direct draw or grounding taking place whether its direct in the starter selonoid or a direct draw through accessories. Are you sure all switches are off ? Push switches (on interior lights) nothing like dome lights,delayed lights are staying on! Does vehicle start hard like it almost needs a jump. If it has to be (and it takes time). to find out what is drawing the power ( i am old school) disconnect positive power source on batt. 2) disconnect ignition power source on starter. 3) connect pos batt wire to starter, 4) touch positive cable to positive batt post and look for spark or contact. if this reacts then selonoid or starter motor is shorted drawing the current. Or if you have volt meter and know how to use it, this is good to. If checks good then hook ignition connection back on starter.(disconnect pos terminal on batt prior to re-connect) I think the battery is having the life sucked out of it by a short in the system ( A DRAW ) this could be a quick find or fix or this could take days to track down. alot of variables here to try to explain. but i would seek into the starter first as usually this drains the battery quickly .

Check the car battery there is a battery in the remote as well but its to new to need to be replaced and so is the battery in the car It sounds most likely like there is a bad connection on one of the battery terminals on the cars battery if the bat is dead in the car the remote won;t work and if the bat is dead in the remote it won;t work but the car will hope this helps

This would appear to be the start of GLOW PLUG failure. Raise the hood and Swich On the Ignition.
With a volt meter,... test the supply voltage on the Glow Plug supply terminal connection. If this is GOOD, Switch Off the ignition and remove the Key.
Remove the Glow Plugs with a Long shank socket.
Make up a length of 14/16 gauge wire, stripped about 1 inch from each end. Attach 1 end to the Battery Pos.+ Terminal,and holding the other end, take each Glow Plug in turn,and hold the PLUG BODY onto the Neg.- Terminal, and TOUCH and HOLD the wire to the Plug TERMINAL CONTACT. If the Plug is GOOD it will SMOKE and GET HOT. If more than 2 Plugs do not react then JUNK them ALL, and replace them. If only 1, then just replace it solely. Make sure on re-installation, that the PLUG, is FIRM and SNUG in the receiver. Disconnect your Supply from the Battery, and attempt Start Up procedure.
Let me know how you get along.
Regards.DT

Corrosion is a powdery / crusty buildup from either battery case seepage around the posts. Or a poor connection somewhere in the system.

If your electrical system isn't failing try a dab of petroleum jelly on the battery posts and some treated felt rings for each battery terminal.

What you're visually seeing is a residue as a release in the form of oxidized acid energy that's escaped the circuit.

This is usually caused by a bad connection on the batt or term. Check the wires going to the bat terminal sometimes they will get loose or even come off

This is definitely a camshaft sensor malfunction, you can get away with not replacing it for awhile but eventually when it goes the car will stop starting, the sensor will need to be replaced hence why your car isn't starting but intermittently. Its easy to do and will take about 30 minutes to do, its just a pain to get to.