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Multi Meter: amzn.to/2MeOvXB
Denso 673-1310 Direct Ignition Coil : amzn.to/2NJ7Np1
Toyota OEM ignition Coil : amzn.to/3sJ3et9
Autel Autolink AL519: amzn.to/381tGqf
My car (2009 Toyota Corolla LE) recently has a Check Engine Light (CEL) P0352 which indicates a bad ignition coil. I wonder a used one (recycle/junk yard/donor) which I bought has the same specification as the new DENSO OEM part. Based on my test, I was surprised the specification of used part is almost same as new part. I also able to determine that the ignition coil that create the CEL P0352 is not within same specification as the used one and the brand new Denso.
New Denso set Ohm at 200K touch Terminal 1 & 4, it has 197
Used (junk yard/Parts recycle center set Ohm at 200K touch Terminal 1 & 4, it has around 191.
Old original OEM parts from car, set Ohm at 200K touch Terminal 1& 4, it has around 38*.
New Denso set Ohm at 2000 touch Terminal 1 & 2, it has 309
Used (junk yard/Parts recycle center set Ohm at 2000 touch Terminal 1 & 2, it has around 307
Old original OEM parts from car, set Ohm at 2000 touch Terminal 1& 2, it has around 347.
Bottom line, the Junk/Recycle parts has reading similar as New Denso; therefore, I replace the #1 and #3 coil with the recycle part. After the coil changed, the car run much much smoother and quieter.
Thanks for watching.