No Spark on DIYPNP

[JoeBWanKenobi]

Hello all,

I have completed building the DIYPNP N52 kit. (YAY!)

Installed it in my 1983 P-Type Supra in place of the stock ECU. Setup the parameters in TunerStudio according to www.diyautotune.com. Adjusted the R39 potentiometer until I received tach signal.
Setup AFR wideband, CLT and IAT resistance,

TunerStudio is reporting RPM, advance, fuel load (wideband), Pulse width, etc. Using the trigger logging utility, I am getting ignition trigger pulses. But there appears to be no spark. The fuel is not burning, and there is never any combustion noise from any cylinders.

So, the ignitor is not sparking on DIYPNP. When I place the stock ECU back in, it sparks just fine.

Has anyone else run into this problem?

I installed the distributor according to TSRM, and it runs on the stock ECU, so the angle and advance should be correct to at least start. There is only one wire which goes to the ignitor to control spark, right?

Any thoughts?

[JoeBWanKenobi]

So, I broke out the ol' oscilloscope today. Tested the IGN signal all the way back to the DIYPNP. No 5v signal. Tested the board all the way back from C3 on the harness connector to the IGN solid-state. Nothing. Tested the collector and emitter. 5v and .3v. Hmmm.

At this point, I realize that the IGN circuit has power, but it is not opening. Knowing that MicroSquirt won't open the transistor unless it gets all the other correct signals, I start looking at other signals and inputs.

Eventually, I removed the microsquirt daughterboard to test and noticed that the Knock Sensor enable jumper is not shorted. Hmm, I have an '83 without a knock sensor, why do I need this? After checking online for another hour, I find-out that the Knock circuit on the DIYPNP needs to be enabled, regardless of whether you have a sensor connected or not.

After jumping the knock-sensor enable circuit 'on', car ignited on first try. I guess the moral of the story is: jumper the knock circuit regardless of model-year.

Now, I have to figure out why the ISCV isn't staying open, and idle dies without throttle input.

[Matt Cramer]

I wouldn't have expected the knock sensor jumper to have made a difference, unless you had a setting in there that was using this port for something. (I can't recall off the top of my head whether the standard 5MGE map does or not.) Leaving out the knock sensor circuit outright, though, can cause a few issues as some of the parts pull double duty in other circuits.

Would you be able to post a data log of the issues you're having now and a copy of your MSQ file? That might shed a bit more light on the subject.

[JoeBWanKenobi]

I resolved the ISCV issues by reversing the PT6 and PT7 leads so the ISCV opened instead of closing.

I haven't been able to work on the car for the last couple weeks because of the demands of the AF, civilian job, and family.