try looking on the top of the transmission, where it bolts into the engine. this is a tricky spot on a 1998. just a guess but it might help. if not, buy a haynes book for Nissan pickups. it is a lifesaver!!
on a 2006 nissan frontier, where is the crankshaft sensor located
pull passanger tire
Crankshaft sensor
location of a crank shaft sensor on a nissan frontier 2002
is the crankshaft position sensor the same and the engine speed sensor
Locate the front wire on the distributer and follow. it will lead to the crankshaft position sensor.
I am not sure of what year you are talking about. But the 1993 and 1994 Altima does not have a crankshaft sensor(crankshaft position sensor) .....
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in the distrubator
CKP Crankshaft Position sensor
The Crankshaft Position Sensor (CKP) is mounted on the top of the transmission bell housing. Assuming you are talking about the 3.3L V6.
How do you change the crank sensor on a 2002Nissan Atima3.5?