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Discussion Starter · #1 ·
CPS early/late interchange? & code 11

Do early 86-88 and late 89+ CPS interchange?
Is the plug the same even though different color?
My wrench says they are the same.

Story: Parked my 7mgte and wouldn't start the next AM. No new codes, and there was fuel and spark from the coil to the plug wires. Diagnosed as the CPS. Rewired the internal CPS wires to the outside, BINGO, started right up. Reset the timing and it starts and runs fine but haven't had it out of the garage yet.

Now have no codes except a new code 11.
"ECU (+B) Wire Severance, however slight, in +B (ECU)

Nothing else was touched.

Did that happen because the CPS was pulled?
Or because the ignitor was temporarily disconnected? OR??
Will it go away by itself or is there something new to look for?
 

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Discussion Starter · #2 ·
Update:
Engine was able to start with a booster. Still carried the code 11. After the first start, it would restart readily. Stopped it. Removed cable and cleaned the negative battery terminal and cleaned and filed the ground wire connector from the negative terminal to the LF fender. Started fine AND code 11 gone and showed my consistent code 51 that has been there for ages. I haven't had time to mess with resetting and/or replacing the TPS but have a new one in stock ready to go. I intend to clean the other grounds also at another time.
I had found a severed O2 wire of the 3 on the harness side of the connector that must have broken moving the CPS in and out. Happily I found a similar white connector on my 84 parts car and wire twisted it on. And as above when the code 11 was gone only the code 51 remained.
 

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Not sure about the plug compatability, but the CPS's have different resistance specs:
'87-'90 = 140-180 ohms
'91 = 205-255 ohms
'92 = 185-265 ohms
- engine cold

Not sure if it really matters though??

Test: http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=IG&P=16
(TSRM for a 1990)

And of course, you remove the EFI fuse from the panel in the engine bay to clear the codes, easier than removing the (-) batt. terminal.

-edit- Weird, this TSRM (for a 1990) has no code 11 listed.
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=26
 

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Discussion Starter · #4 ·
"And of course, you remove the EFI fuse from the panel in the engine bay to clear the codes, easier than removing the (-) batt. terminal."

The curious thing that I've experienced and I think I recall others have is that sometimes removing the fuse doesn't clear but the battery disconnect does. Strange. Any ideas?
 
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