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I now have my hands on a JDM ECU, so I hope to answer this shortly.

If you look at the wiring diagram the coil primaries connect to 12V and the three ignitor "switch" inputs. The secondaries goes to the plugs. There are no direct connections to the shield. The shield is there to minimize EMI interference. I believe the TSRM says to check that there is NO...

The IGda/IGdb signals are generated by a chipset in the ECU, and the microprocessor only generates IGt and checks for IGf. So, to answer your question, no there is no code for bad coil select signals, and a bad IGdx signals would result in the wrong coil firing. But you can check for continuity...

Yeah, don't give up, use your knowledge to isolate the issue. The problem with your "weak" spark diagnosis is that its subjective, you don't know if it working as designed because you don't have a known good system nearby to compare. Make a test plan, or use the guide in the TSRM, and go...

See this for oil capacity http://www.supramania.com/forums/showthread.php?141765-AC-oil-did-i-put-in-too-much&p=1853109&viewfull=1#post1853109

This may help. http://www.cygnusx1.net/Media/Supra/TechTips/vacuum_2h.gif

G1 & G2 would be the only possible combination that could be flipped. The ECU won't care though, and it surely won't impact the spark intensity. Measuring your ignition HT voltage on a scope for each plug would be a much better idea than all this futsing around in this thread and your other one.

A code 31 won't always set in an intermittent situation, so that might explain its behavior.

That's easy. We just flash the M/T code into the A/T box, since the hardware is the same for both boxes the code change is all that's needed. The JDM and USDM use the same boards too, but I did notice the JDM box has a few components where the USDM has nothing inserted. I still suspect that...

Wait, don't do that! I misunderstood your solution. That won't work since the GTE doesn't support configurable options like the GE does. I was thinking you were talking about adding the resistor at the EGR temp sensor connector. Adding a resistor at R613 will not do anything as the code...

This is taken from post #535 in this thread..... So no, it will not be activated during high load etc, in fact on a turbo engine that would potentially result in a dangerous lean out under boost. It can be only activated during cranking, period. I have a CA 7MGTE ECU but have not examined...

Sometimes I get lucky. In this case going from an antenna jack to RCA seems to be unobtainium. RCAs aren't impedance matched so no real surprise I guess.

and now Pandora too...

That's why Satellite XM radio was invented!

I have not seen an adapter to RCA, but they do exist to convert to a regular antenna connector. The small one is called a GM Mini. http://www.amazon.com/Scosche-Automotive-Harness-1988-up-Antenna/dp/B00009UHJS/ref=pd_cp_e_2

Toyota HUs have two antenna inputs and internal "diversity" logic to select the best one at any given time. If your aftermarket HU does not support diversity then just use the larger cable which connects to the motorized whip. edit: JJ beat me to it.

Two antenna leads at the radio, a"normal" sized one, and a smaller one.

This sure is breaking news, yawn! http://www.supramania.com/forums/showthread.php?28771-ehh...-my-dipstick&p=381354&viewfull=1#post381354

Its the giant banjo assembly on the head that leads to the heater valve on the firewall. See 16268 in the EPC below. I would not recommend replacing it unless you are prepared to pull the head if things go badly (like it breaks off in the head as it commonly does)...

Use a nickel based anti-seize for this application. http://www.superior-industries.com/_1500_anti_seize_product_234.html