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Us And Them
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Discussion Starter #1
So I'm trying to diagnose no spark and i'm following the TSRM
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=IG&P=5
and it says to
"Check power supply to ignition coil" with the fix being to
"Check wiring between ignition switch to ignition coil"

And i'm confused as to where i'm supposed to look.
Where does the power come from?

I follow http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=IG&P=15
and terminal 3 has no power.

I've replaced the plug on CPS and soldered the wires.
HELP! tying to get back into the Supra game after the car has been sitting for 4ish years and i have a new motor waiting to start!
 

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17 Posts
Did you check fuses? I had the same problem and it turned out to be a blown efi fuse

Sent from my VS990 using Tapatalk
 

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Us And Them
Joined
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1,038 Posts
Discussion Starter #3
Yeah, 15A EFI under the hood is good and i'm not throwing any codes
 

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Us And Them
Joined
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1,038 Posts
Discussion Starter #4
I got the new engine running!
after a more thorough examination of the TSRM I found that I read it wrong. I was testing the wrong side of the ignitor after I unplugged it so of course there was no power.

The fix;
I tested the resistance of the CPS at the ECU and it was a problem. Turns out i had a wire rubbing on the CPS housing internally and it was grounding out when it should have been giving me a positive cam signal.
So i pulled the CPS apart and cleaned the sensors internally, rewired with new wires & heat shrink and made sure the gaps were in spec, then soldered a new plug on.
Vroom she started!
 
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