16 Jul 2021
Things Were Done Wrong
That'd be a good alternate title for the website: "Things that I have done that are probably done incorrectly".
Realized last time that I don't have a wire for the tach, also that I don't have the "you're in cruise" wire (referenced
halfway down here)
Well, the wiring diagrams helped; they let me know that the tach wire goes from
the PCM as circuit 121, Red #10 not to the dash -- that comes over the serial
data - but to the traction control (which I don't have), and that the "cruise
active" wire is PCM circuit 85, going to pin Red #13. Both wires are white
and are pins F and G in connector C105.
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Well, we have to start by removing this fender. I'll have to do some
cleanup to try to get it to fit better anyway. |
Here we have C105. I only have one of these wires - the tach wire
to the traction control. | |
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So I can just remove it from C105, go from the PCM directly to a wire
heading into the cab.
I tried a weatherpak connector and made what
looked like outstanding crimps. They weren't outstanding; no
continuity between the weatherpak pin and the PCM pin 10. Also no
continuity between it and PCM pin 13... and when I went to pull it back
apart, the weatherpak pin just pulled right off.
And then I realized
that what I had was not the tach wire, it was the cruise enable, and I'd cut
the C105 pin off.
So - where is the tach wire from the PCM
going, and what am I going to do about the cruise-is-on light wire?
As it sits here, I have pin 10 of the PCM (Tach out) connected to apparently
nothing, and pin 13 (Cruise Indicator in) (not really) connected to a wire
headed towards the cab. Quick fix: de-pin the PCM for both, so pin 10
is to the tach wire. |
Back in the day ("The day" being defined as
12 Jun 2020), I put a grommet in
the firewall and ran the wires for C220 and C230 through it. I've since
realized that low on the firewall on the pass side invites a flood every time I
drive in the rain, that location is unsuitable. I'll need to run them through
the cowl sides. They're *probably* long enough. I'll also run the
two new wires for the tach and the cruise indicator.
You can vaguely see the grommet and the wires. | |
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The better seal on the inside still wouldn't be sufficient. |
Of course, as part of this, I had to unwrap the wires. Again.
Really would have preferred to not do this. |
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Go back to the previous day (10 Jul 2021)