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After not driving for 2 - 3 weeks, started right up, drove great, rural, then highway for 20 minutes. Pulled off highway to take 45 mph road home, still fine. Stopped for a light and as I was slowing the check engine started blinking and as I stopped momentarily the engine barley ran very rough. The light immediately changed and I was able to accelerate away and drive to the next light where the same thing happened. Just as I was looking for a place to pull over, the light stopped, went completely off and the engine returned to normal feel and operation the rest of the way home. Blinking light refers to mis-fire condition. Do you have a more specific idea? 2002 64,000 miles akways ran great. Thank you, in advance.
ignition coil 5 control circuit PO355
Cylinder 5 misfire detected P0305
Since the problem completely disappeared it sounds like a loose connection in the circuit to the injector, right?
The “coil pack” control circuit (not fuel injector) code tells you that this control wire is either open, shorted to ground, or shorted to voltage…don’t know how good you are with electrical or if you own a 12 volt test light or DVOM…coil control wire is the dark green wire…if you had a scope or a graphing multimeter you would see a 0-4 volt square wave on the control wire with the engine idling…every time the engine computer grounds that control circuit the coil pack will fire the plug…with a test light you can actually fire the coil pack with just the key on…don’t know how far you want to diagnose this…blinking MIL is a cat damaging misfire so you want to fix this ASAP.
The “coil pack” control circuit (not fuel injector) code tells you that this control wire is either open, shorted to ground, or shorted to voltage…don’t know how good you are with electrical or if you own a 12 volt test light or DVOM…coil control wire is the dark green wire…if you had a scope or a graphing multimeter you would see a 0-4 volt square wave on the control wire with the engine idling…every time the engine computer grounds that control circuit the coil pack will fire the plug…with a test light you can actually fire the coil pack with just the key on…don’t know how far you want to diagnose this…blinking MIL is a cat damaging misfire so you want to fix this ASAP.
thank you so much. I can easily handle all that. Ive done a lot of wiring in different disciplines, electric AC and DC phone systems, phone central office and conversion to digital, auto systems, remote starters, and I got my first digital meter to test coil packs on my first Corvette.
The blinking stopped as quick as it started and its running great, but what ever is loose needs to be fixed. Ill pop those covers off and dig into it hopefully this weekend. The coil pack (sorry wrong word choice above) doesn't fix itself so I'm betting it's a connection/wire issue.
thank you again.
Mark
I would check the dark green wire from the coil pack to the connector which is above the coil pack (pictured)…I would make sure that the terminals aren’t spread apart either.
Could be just one loose pin…you can hook up an ohmmeter from the coil pack to that connector and just do the old “wiggle test” and see if the circuit goes open.
Sudden blinking check engine then gone
