Originally Posted by
red_2005_convertible
Hi Zip,
Thanks, You're correct, I checked and it's actually pins 1 and 11 on C4 of the PTCM. BTW, to get 60 ohms you need to back probe the C4 connector while it's still connected to the PTCM. If you disconnect from the PTCM, and measure from the front of the connector you should get 120 ohms, and if you measure the pins on the PTCM, you should also get 120 ohms. Unfortunately, my experience was gained the hard way - the CAN BUS splice (S116) in the engine compartment under the brake booster failed, but before I figured that out, I did a lot of diagnostic work. (Not to advertise my posts, but I have a post called "No Crank...." that has all of the voltages and resistances that I measured before I found the bad splice in the CAN BUS. Some other useful info in there is how to manually run the fuel pump or the starter motor.)
-Jerry
I read your other "No Crank" thread; lots of time/work but that's what it takes now to keep these aging cars up and running. You wont find a commercial shop willing to put that much effort into properly sorting out a problem.
I just spent ten days finding and to verify my PTCM problem ( It wasn't switching to ground when necessary on O2 circuit). Good work! Thanks for the info; very helpful.