Fault Code 1117
08-25-2020, (Subject: Fault Code 1117 ) 
Post: #30
RE: Fault Code 1117
(08-25-2020 )DVT873 Wrote:  I need to think about this a bit more. Forgot about the kick back. Thanks

Yeah, when a magnetic field collapses, it creates a kickp-0back current and voltage. If it has nowhere to go, that voltage will climb into the tens of thousands of volts or more range until it finds and jumps across a pathway. Usually the relay or electronic circuit that is attached to ... hence the spark seen as the contacts open on a relay (wears out the relay eventually) .. or jumping the silicone substrate inside a solid state device like a transistor, Diode, FET, or SSR whatever is controlling it. The Only way to stop it is a diode in reverse across the power to ground so that the voltage can be safely bled off.

The 2 diode approach you used would be fine as long as that kick-back has somewhere to go (a 3rd diode in reverse from power to ground of the coil itself). ... or just using a single diode to protect the ecm, a second one in reverse across the coil to bleed kick-back off, and a small fuse to protect the ignition circuit (needed regardless of what approach you take) in case anything in the circuit fails.


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Messages In This Thread
Fault Code 1117 - Biglentil - 04-23-2020,
RE: Fault Code 1117 - kozakvod - 04-23-2020,
RE: Fault Code 1117 - Brock - 04-23-2020,
RE: Fault Code 1117 - Rawze - 04-23-2020,
RE: Fault Code 1117 - tree98 - 04-26-2020,
RE: Fault Code 1117 - Rawze - 05-01-2020,
RE: Fault Code 1117 - Mr Hagg - 07-22-2020,
RE: Fault Code 1117 - Rawze - 08-05-2020,
RE: Fault Code 1117 - Nilao - 08-05-2020,
RE: Fault Code 1117 - Rawze - 08-07-2020,
RE: Fault Code 1117 - Rawze - 08-19-2020,
RE: Fault Code 1117 - Rawze - 08-20-2020,
RE: Fault Code 1117 - Rawze - 08-21-2020,
RE: Fault Code 1117 - DVT873 - 08-24-2020,
RE: Fault Code 1117 - Rawze - 08-25-2020,
RE: Fault Code 1117 - DVT873 - 08-25-2020,
RE: Fault Code 1117 - Rawze - 08-25-2020
RE: Fault Code 1117 - DVT873 - 09-20-2020,
RE: Fault Code 1117 - tree98 - 09-08-2022,



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