07’ Nissan Sentra- Crank, no start/spark
40

Asked by Emery Jan 15, 2018 at 12:12 AM

Question type: General

Greetings,
Alrighty bare with me here Lol. So I planned on doing both
inner and outer tie rods on both sides of my car, but
before I did that I decided to remove and clean out my
blower motor since it was making noise; found tons of my
firewall that mice ate inside of my blower motor so I
cleaned it out, reinstalled it, and turned the key but DIDNT
start it I just tested to see if it was working and it worked
just like before. So the next day I planned to pull it in the
garage and do both tie rods fully, I went to start it and it
wouldn't run, it would turn over and crank but not fire up
and run at all. And it ran perfect before I removed the
blower motor, so I'm confused as to why after removing
the blower and simply cleaning it out my car will turn over
but not fire up & run. Clueless! One MISTAKE I made is
not disconnecting the battery while doing the blower
motor (SO dumb)...Heres the EXACT order I went in when
from start to finish: Unbolted the gas/brake pedal
assembly from firewall, then unplugged 3 harnesses
attached to the gas/brake pedal, unscrewed the BCM
(and BCM mount) and unplugged the 3 connectors
attached to BCM, unscrewed the bolt that holds the
Blower motor in, then unplugged the 2 wires plugged into
the Blower motor. And that’s it, after that I vacuumed the
motor out and re-installed it the EXACT way in reverse
order. Next day I went to start it, started cranking but did
NOT fire up since then...everything is fully assembled and
plugged in but still does not fire. Tried disconnecting the
the battery for 30 minutes and reconnecting it to see if it
would reset itself and still nothing. Few days after, I got
my multimeter out & tested for power @ the ignition coil
harness, no power there. IS getting fuel, just no spark.
Anyone else seen this issue before or can get the ball
rolling? Thanks.

9 Answers
40

Emery answered 6 years ago

Hmmm...there is no spark at any of the 4 ignition coils, with the multimeter I tested for power at the harness that plugs into the 4 connected ignition coils, no power there either.

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Jake answered 5 years ago

I'm going through exactly the same thing right now. Did you ever get it fixed?

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40

Emery answered 5 years ago

I still have NOT fixed it or found the issue. I’ve charged the battery to full multiple times to do some more digging into the problem but it still just cranks/turns over but does not fire up.

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Wk1102 answered 5 years ago

A bad cam sensor would give a no spark condition?

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Krista answered 5 years ago

I think it's either the bcm or ecm. I've been reading the factory service manual and all signs point to one or both.

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Emery answered 5 years ago

That would be my best guess as well, since the BCM talks to the ECM upon startup/on position and also the BCM is responsible for every power control inside the car. I think it’s the BCM but I don’t know how to go about getting a new one re programmed

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Krista answered 5 years ago

I sent mine to my local Nissan dealer. They confirmed that the bcm is, in fact fried. That is a 1000$ mistake over a simple error.

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