Got Infinite Resistance between G2 and G- P/U Coil

MA70-3.0GT · 08-07-2010, 11:02 AM

I don't think anything is shorting, as infinite ohms is open circuit... (I'm assuming a typo here but did you mean zero ohms/short or inf. ohms/open?)

With the connector for coil 3/5 removed (they unplug seperately under the coil pack iirc) are you getting any signal through those wires with the engine running? (bear in mind CDI signal voltage although short will be probably over 100Vdc and likely easier detected on a scope)

If there is a signal there it's possible the coil itself is u/s, have you checked & compared the 3 coil pack's primary/secondary resistances? it may be easier/safer to prove out the coils by this method.

08-07-2010, 11:02 AM	#3
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	I don't think anything is shorting, as infinite ohms is open circuit... (I'm assuming a typo here but did you mean zero ohms/short or inf. ohms/open?) With the connector for coil 3/5 removed (they unplug seperately under the coil pack iirc) are you getting any signal through those wires with the engine running? (bear in mind CDI signal voltage although short will be probably over 100Vdc and likely easier detected on a scope) If there is a signal there it's possible the coil itself is u/s, have you checked & compared the 3 coil pack's primary/secondary resistances? it may be easier/safer to prove out the coils by this method. __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!! Last edited by MA70-3.0GT; 08-07-2010 at 11:08 AM.