More ignition questions\observations

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CoBHC

New Member
Apr 20, 2006
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Cincinnati
Alright, so I'm out in the garage right now working on this thing. I have pulled out the CPS and am spinning it by hand and maybe every 10 full revolutions I might get a spark from one of the coils.

Any idea on what might cause such an intermittant problem?
 
C

CoBHC

New Member
Apr 20, 2006
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Cincinnati
IJ. said:
Check the wiring and the connector as they become brittle with age due to their location/heat.
Click to expand...


Yep all the wiring as already been repaired, and ohm out ok where they plug into the ecu.

I'm actually getting some sort of signal to the igniter from the IGt but both of my buddys o-scopes are broken so I can't tell what exactly the signal is.
 
C

CoBHC

New Member
Apr 20, 2006
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Cincinnati
CoBHC said:
Yep all the wiring as already been repaired, and ohm out ok where they plug into the ecu.

I'm actually getting some sort of signal to the igniter from the IGt but both of my buddys o-scopes are broken so I can't tell what exactly the signal is.
Click to expand...

Also, while I spin the CPS the I can hear fuel running through the rail but I can't hear/feel any of the injectors firing, and I can hear a relay in the passanger kickpanel clicking.

Edit: I hate this fucking car. :(
 
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IJ.

Grumpy Old Man
Mar 30, 2005
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I come from a land down under
Hopefully JetJock will see this being our resident expert on all things TCCS.
(I skipped Toyotas box of tricks and went straight to a standalone so have very minimal information of any use sorry)
 
C

CoBHC

New Member
Apr 20, 2006
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Cincinnati
IJ. said:
Hopefully JetJock will see this being our resident expert on all things TCCS.
(I skipped Toyotas box of tricks and went straight to a standalone so have very minimal information of any use sorry)
Click to expand...


Yea I'm half tempted to go that route as well, it's either that or buy an igniter and ecu since I can't figure out which is broken.
 
jetjock

jetjock

creepy-ass cracka
Jul 11, 2005
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Redacted per Title 18 USC Section 798
They need to be at least 1 volt p/p. Here's the timing. Without spark you won't get injection. If you're not getting spark you should be getting a code 14. If no code 14 the CPS isn't being recognized. In that case a code 12 or 13 should come up.

edit: Oops. If you're spinning it by hand the 12 or 13 won't come up because the ECU doesn't know the engine is being "cranked". The relay you're hearing is the Circuit Opening Relay. It turns the fuel pump on when CPS signals are detected. All that tells me the ECU is recognizing the CPS. You could be missing one of the G signals but the engine should still run. Put it back together and try to start it ;)

edit X 2: You said in the other thread the injectors were working. Now they're not? If the injectors were working you had to have at least some high voltage from the coil. If they're not working now you might have to pull the CPS again to make troubleshooting IGt and onwards easier. Too bad you don't have a CPS simulator. Makes things less of a hassle.
 
C

CoBHC

New Member
Apr 20, 2006
18
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Cincinnati
jetjock said:
They need to be at least 1 volt p/p. Here's the timing. Without spark you won't get injection. If you're not getting spark you should be getting a code 14. If no code 14 the CPS isn't being recognized. In that case a code 12 or 13 should come up.

edit: Oops. If you're spinning it by hand the 12 or 13 won't come up because the ECU doesn't know the engine is being "cranked". The relay you're hearing is the Circuit Opening Relay. It turns the fuel pump on when CPS signals are detected. All that tells me the ECU is recognizing the CPS. You could be missing one of the G signals but the engine should still run. Put it back together and try to start it ;)

edit X 2: You said in the other thread the injectors were working. Now they're not? If the injectors were working you had to have at least some high voltage from the coil. If they're not working now you might have to pull the CPS again to make troubleshooting IGt and onwards easier. Too bad you don't have a CPS simulator. Makes things less of a hassle.
Click to expand...


I feel like an idiot.

I finally got a working scope and was checking all the leads on the CPS, and I have no idea how I managed this but I somehow switched the wires for the G1 and NE signals. As soon as the scope was hooked up I saw that constant sine wave on what I thought was G1 wire and knew right there I found the problem.

Also, the wires coming off the ECM apparently change color at the origional connector? Yea anyway I'm a moron, and after about 3 years she roared(sputtered and chugged) to life tonight as there are about 10 vacuum leaks and maybe 1/3 of the sensors on the engine are hooked up.

I just want to thank everyone who has contributed to my efforts over the last couple days. Much appreciated guys.
 
F

figgie

Supramania Contributor
Mar 30, 2005
5,225
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Twin Cities, Minnesot-ah
O-scope for the win.

You know that is one thing about some standalones. They have started to include a rudimentary oscope to capture crank signal levels. Of course not a REAL oscope but man does that help in TSR'ing.
 
C

CoBHC

New Member
Apr 20, 2006
18
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0
Cincinnati
An update for anyone interested:

Spent most of the evening tightening the suspension up but went after a couple of the vacuum lines and the more important sensors.

Got them all either hooked up or plugged and decided to try to time it. Jumped the 2 connectors and fire it up, it was about 30 degrees retarded at first and backfired out the intake a couple times, I'm sure that was good for it. :p Moved the CPS a tooth over and she roared to life, but is idling at about 1500. I shall look into that over the weekend. I'm guessing it is probably just a vacuum leak but who knows, could be TB or ISC or anything.

I gotta say though, the motor is smooth as silk and the exhaust sounds fantastic. I have the suprasport elbow, older AMS 3" downpipe, and my buddy and I welded up a 3" exhaust from straight pipe and a 180 degree mandrel bend. You guys seem responsible and all so you probably aren't in favor of a loud exhaust, but it's still quieter than the 454 Chevelle it's sitting next to.

One question I do have is what exactly the connector to the oil pressure sender looks like. I can't seem to find a clear picture of it anywhere and there are a couple connectors chopped off my harness that I need to repair.
 
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