No Start Again

[Lee3333]

1999 SW2 again. I took the car and had the codes checked-the only one that
could apply was P1635 5 volt reference in # 1 circuit. I have not checked
out exactly what it means yet.

Anyway, the car started fine this morning, ran well, and was fine with
repeated start-ups. When I got home from work, I tried to start the car
again but it would not fire up. This time, I was aware of several things.
With the ignition on, the fuel gauge did not respond at all. Also, the
low fuel light was flashing.

Could the problem be that the fuel sensor is not working, so the fuel pump
is not turning on?

 

[Philip Nasadowski]

1999 SW2 again. I took the car and had the codes checked-the only one that
could apply was P1635 5 volt reference in # 1 circuit. I have not checked
out exactly what it means yet.

Something's killing the +5 volt sensor ref voltage. Sounds like it's
either being shorted intemittantly, or going dead intermittantly. You
want it to be the former - the latter means new computer

Anyway, the car started fine this morning, ran well, and was fine with
repeated start-ups.

I've got my finger on intermittant short.

When I got home from work, I tried to start the car
again but it would not fire up. This time, I was aware of several things.
With the ignition on, the fuel gauge did not respond at all. Also, the
low fuel light was flashing.
Yuck.

Could the problem be that the fuel sensor is not working, so the fuel pump
is not turning on?

I'm guessing the sensor's a victim here. It can't read anything with no
+5V power. I'm betting you've got a chaffed wire somewhere in the
harness that's intemittantly grounding out the +5V line, which kills all
your sensors that depend on it, and tosses a trouble code.