[/IMG]
igmition start problem
Melting Slicks
Joined: Feb 2011
Posts: 2,322
Likes: 6
From: Los Altos CA
Hi Romulo,
To get a voltage drop current must be flowing. I haven't looked at the schematics so am not quite sure where you are probing. I think there are two possibilities:
There is enough current flowing that the battery voltage itself drops. Some drop is normal since batteries have an internal resistance. The starter motor is a high current load so some voltage drop while starting (or trying to start) will occur.
or
There is a voltage drop due to resistance in the wiring and other circuit components between the battery and the point you are probing. Some drop will occur, I'm not sure how much is normal.
I think you are looking at the circuit that goes from the ignition switch to the starter solenoid, right? The solenoid has two jobs: 1) shove the starter gear into the flywheel gear and 2) close the switch that allows current to flow through the starter motor itself. If the solenoid is engaging but the starter motor isn't then the problem is likely in the starter motor circuit---i.e. the switch the solenoid should be closing, the related wiring and the starter.
To get a voltage drop current must be flowing. I haven't looked at the schematics so am not quite sure where you are probing. I think there are two possibilities:
There is enough current flowing that the battery voltage itself drops. Some drop is normal since batteries have an internal resistance. The starter motor is a high current load so some voltage drop while starting (or trying to start) will occur.
or
There is a voltage drop due to resistance in the wiring and other circuit components between the battery and the point you are probing. Some drop will occur, I'm not sure how much is normal.
I think you are looking at the circuit that goes from the ignition switch to the starter solenoid, right? The solenoid has two jobs: 1) shove the starter gear into the flywheel gear and 2) close the switch that allows current to flow through the starter motor itself. If the solenoid is engaging but the starter motor isn't then the problem is likely in the starter motor circuit---i.e. the switch the solenoid should be closing, the related wiring and the starter.
Thread Starter
Drifting
Joined: Aug 2011
Posts: 1,861
Likes: 1
From: panama panama
Here is the link for youtube video iam talking about. Look preaty convincent for me. Dont you tell mehttp://m.youtube.com/index?desktop_u...?v=dGem9YsjCRQ
Melting Slicks
Joined: Feb 2011
Posts: 2,322
Likes: 6
From: Los Altos CA
Did you replace the starter after your hammer test?
Does the solenoid engage?
Please post up the schematic & maybe indicate where you are probing (cause I'm too lazy to go looking, sorry).
I'm gonna go waste some time on CFOT then do some chores but will check in later.
Does the solenoid engage?
Please post up the schematic & maybe indicate where you are probing (cause I'm too lazy to go looking, sorry).
I'm gonna go waste some time on CFOT then do some chores but will check in later.
Melting Slicks
Joined: Feb 2011
Posts: 2,322
Likes: 6
From: Los Altos CA
Ahhhh...it's upside down...my brain hurts!!!
Kidding asside, thanks.
As I recall you did the bypass by bridging the contacts with a piece of metal. There's a good chance this connection is loose, or has burned a bit in use, and is the cause of the voltage drop. I suggest you re-do the bypass using wire with soldered or good twisted connections.
Kidding asside, thanks.
As I recall you did the bypass by bridging the contacts with a piece of metal. There's a good chance this connection is loose, or has burned a bit in use, and is the cause of the voltage drop. I suggest you re-do the bypass using wire with soldered or good twisted connections.
Melting Slicks
Joined: Feb 2011
Posts: 2,322
Likes: 6
From: Los Altos CA
Oh, check this first:
Check the voltage on both sides of the bypass as indicated below:
If the voltage is the same then your bypass is probably ok.
Have you checked the voltage at the battery itself when you try starting?
Check the voltage on both sides of the bypass as indicated below:
If the voltage is the same then your bypass is probably ok.
Have you checked the voltage at the battery itself when you try starting?
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Thread Starter
Drifting
Joined: Aug 2011
Posts: 1,861
Likes: 1
From: panama panama
Ahhhh...it's upside down...my brain hurts!!!
Kidding asside, thanks.
As I recall you did the bypass by bridging the contacts with a piece of metal. There's a good chance this connection is loose, or has burned a bit in use, and is the cause of the voltage drop. I suggest you re-do the bypass using wire with soldered or good twisted connections.
Kidding asside, thanks.
As I recall you did the bypass by bridging the contacts with a piece of metal. There's a good chance this connection is loose, or has burned a bit in use, and is the cause of the voltage drop. I suggest you re-do the bypass using wire with soldered or good twisted connections.
Melting Slicks
Joined: Feb 2011
Posts: 2,322
Likes: 6
From: Los Altos CA
Sorry to belabor this point, but...
If the solenoid is engaging then you need to think about this part of the schematic:
I added arrows to the starter motor and the switch the solenoid has to close to provide current to the motor.
Check out table 1 and 2 below:
If the solenoid is engaging then you need to think about this part of the schematic:
I added arrows to the starter motor and the switch the solenoid has to close to provide current to the motor.
Check out table 1 and 2 below:
Last edited by 3D87C4; Jan 15, 2012 at 04:24 PM. Reason: added FSM scan
Melting Slicks
Joined: Feb 2011
Posts: 2,322
Likes: 6
From: Los Altos CA
If
- the solenoid isn't engaging
- the voltage at the battery isn't changing
- and, the voltage at the relay (your pencil location) is dropping
Thread Starter
Drifting
Joined: Aug 2011
Posts: 1,861
Likes: 1
From: panama panama
I will try to be very crear. Starter motor check out ok on the shop 2 times las time the check wa las monday after the hammer . So the Starter and solenoid aré ok
About voltage . When i check the yellow wire with out the green and white wire the voltage is ok. But if i conect this 2 wire together the voltage drop below 12v
i check in the same placer i do the join see the pictures above
About voltage . When i check the yellow wire with out the green and white wire the voltage is ok. But if i conect this 2 wire together the voltage drop below 12v
i check in the same placer i do the join see the pictures above
Last edited by hitmanpty; Jan 15, 2012 at 04:13 PM.
Thread Starter
Drifting
Joined: Aug 2011
Posts: 1,861
Likes: 1
From: panama panama
here i go again if i disconect the yellow wire comino from ignition switch the test will do ok only When i conect to green wire the voltage drop.
So how can the ignition switch be bad
Last edited by hitmanpty; Jan 15, 2012 at 04:52 PM.
Thread Starter
Drifting
Joined: Aug 2011
Posts: 1,861
Likes: 1
From: panama panama
[/IMG]this is testing the yellow wire coming from ignition switch read 12.5 v
Thread Starter
Drifting
Joined: Aug 2011
Posts: 1,861
Likes: 1
From: panama panama
[/IMG]Test made in the same place. Before the gear selection switch
No click from solenoid
Last edited by hitmanpty; Jan 15, 2012 at 05:12 PM.
Le Mans Master
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