Nissan Repair Questions? Ask a Mechanic for Answers ASAP
you listed this as a 99 altima? is it a 99 or an 05?
The 99 would have a distributor and a cable driven throttle, so since you performed an idle relearn lets go with the fact its likely an 05
if so the RPM signal will come from the crank sensor.
are you getting any codes at all? are you getting spark?
have you tried unplugging the crank sensor and starting the car in safe mode?
what did the car come in the shop for?
and you replaced the throttle assembly, did the relearn, and now the engine cranks but won't start.
you have no RPM signal yet you have spark?
all this is correct?
when you turn the key to ON position and leave it, you don't get anything peculiar like a condensor fan running, the security light on solid, or a service engine light right?
try starting the car while depressing the gas pedal for me.
have you tried starting fluid?
because nothing is really adding up to be honest
your saying the car will not start with the crank sensor unplugged or plugged in. Your saying you verified it has spark and replaced the crank sensor already.
Since you replaced the throttle I was hoping the closed position set was not met and it was not getting enough air, but you already attempted that as well.
you said the secuirty light was not on solid, so it should have injector pulse. Since it did start the one time though with started fluid can you verify injector pulse for me?
The pump must not be running then because it can't see engine speed
did you scope the crank sensor by chance just to make sure its seeing the reference?
or make sure there is voltage to the sensor and a ground also?
Thats so odd for a car that came in for a throttle issue to now have no RPM signal.
all i can think of at this point from your descirption and symptoms over the net is that the reference signal back to the ECM is not getting there.
hence no RPM signal and the fuel pump not running after priming.
and seeing that its a 2.5 altima with spark and injector pulse we KNOW the cam sensor is functioning fine
so until you check continuity from the crank sensor reference wire to the ECM, and verify a reference signal. We have to assume it's not getting there since your scanner shows no signal.
Which means start at the crank sensor and connector inspection or proceed with above mentioned steps.
Wish i had an easier nugget of advice on this one.