Mechanics

PLEASE TELL ME WHAT IT COULD BE.

1999 Honda Civic • 99,000 miles


I have a 1999 Honda civic si with 100,000 miles on it. And it won't start and run unless I pull out the sp sensor alternator Fuse and turn headlight's on or heater on.
Avatar
Donald Steve lee
August 15, 2012.




Voltage regulator is inbuilt and since you can't have engine running with it connected, you would need to remove it for a bench test.

KHLow2008
Aug 17, 2012.
Alternator was fine. Like new back to the drawing bord my father in law was the one who red my coeds. I don't mood he did it right but before my car finally choked out he read my coeds and I rote them down and just found them and hear they are. Po116 - p1399 and stored po108 - po420

Tiny
Donald Steve lee
Aug 20, 2012.
P0116 is a fault with the Engine Coolant Temperature switch. This can cause difficut starting and stalling when engine is warmed up.

P1399 is temporary codes for misfiring.

Others have been explained to you.

Have the ECT checked.
AD

KHLow2008
Aug 20, 2012.
Hay if I had a bench test done on the alternator it would not tell me if the voltage regulator is over charging would it. Becaulse the (PCM) is used as part of the alternator control system sending a signal to the voltage regulator. I think the alternator is causing this problem I have smoke rolling out of my ears! Thanks

Tiny
Donald Steve lee
Aug 21, 2012.
Hay if I had a bench test done on the alternator it would not tell me if the voltage regulator is over charging would it? Becaulse the (PCM) is used as part of the alternator control system sending a signal to the voltage regulator. Don't no just asking. Thanks again

Tiny
Donald Steve lee
Aug 22, 2012.
It is possible bench test don't tell if it is overcharging and yes, you are correct about the PCM controlling the charging. Apart from the alternator, the PCM can also possibly cause charging faults.

One way of finding out is to replace with a known good alternator and test. A no charging problem is not too bad but an overcharging system is very dangerous as it can take out a lot of electrical components when voltages spikes.

I once had an older model vehicle which had every bulb in the vehicle blown and wasted a lot of time diagnosing as I did not think of all bulbs blowing when lightings did not work.

KHLow2008
Aug 22, 2012.

AD