"Akio Ohtori - RIP Oppo" (akioohtori)
06/29/2019 at 23:39 • Filed to: Disco Inferno
3
6|
"Akio Ohtori - RIP Oppo" (akioohtori)
06/29/2019 at 23:39 • Filed to: Disco Inferno | 3
| 6 |
What a pain in the ass!
A while back I’d noticed the cruise wasn’t working and put it on the TODO list. Since I’m planning a couple longer trips in it, I figured today was the day to work on it.
First thing to check was the vacuum hoses. Sitting in the engine bay, they’re know for perishing and causing the system not to work. Sadly, mine were in good shape.
Assuming then that the vacuum pump sucked in a bunch of crap the last time the hoses were bad, I went ahead and swapped over the pump for one I had hanging around. I also hooked a manual vacuum pump up to the throttle actuator and proved that it was working.
Actuator was working and swapping the pump made no difference.
Crap!
Ok well I guess it could be my brake switch? But my brake lights are working fine. In fact I just replaced them with LED bulbs a couple weeks ago.
Well must be the Cruise ECU? The manual shows that on the driver’s side so I’ll just pop off that panel....
Oh. The other driver’s side.
Take off the glove box, remove the panel, and pull off the ecu and swap it with a junk yard spare.
Still nothing.
I can hear the relay clicking, but no actuation .
Crap.
Uhh... ok. Wiring harness maybe? Or...
Wait.
It couldn’t be...
Not...
Not my LED tail lights?
I pulled the 3rd brake light and replaced it with conventional and...
Yup. Everything works fine now.
Uuuuuuuuuuuuuugh I guess the system uses the resistance of the tail lights as some sort of pull down or load resistor. Without it, the system assumes the brake pedal is pressed and shuts off.
Now I have an completely torn apart interior but working cruise! Crap...
shop-teacher
> Akio Ohtori - RIP Oppo
06/29/2019 at 23:49 |
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D'oh!!
RacinBob
> Akio Ohtori - RIP Oppo
06/30/2019 at 00:06 |
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And people say Alfa Romeos are complicated ......
BrianGriffin thinks “reliable” is just a state of mind
> Akio Ohtori - RIP Oppo
06/30/2019 at 00:30 |
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Usually the simplest solution is the right one.
M.T. Blake
> Akio Ohtori - RIP Oppo
06/30/2019 at 00:39 |
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Always go back to the last thing you did before the problem arose.
Followed this rule into success after I did some work to a 300zx years ago. I moved the igniter wiring harness and it wouldn’t start afterwards. Would have chased my tail for hours had I not thought about how I moved it around during the service.
SilentButNotReallyDeadly...killed by G/O Media
> Akio Ohtori - RIP Oppo
06/30/2019 at 04:59 |
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First rule of Land Rover modification: Change nothing. Unless you are prepared to run a full diagnostic immediately afterwards...
MiniGTI - now with XJ6
> Akio Ohtori - RIP Oppo
06/30/2019 at 19:18 |
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I’d love to get the cruise working in my Jaguar but both the Haynes and the Bentley Manual only barely mention its existence and certainly nothing about how to troubleshoot it. It’s a big vacuum operated bellows in the engine bay; all the rubber bits look at least kind of OK. I don’t know if there’s some kind of controller circuit for it somewhere or what I should be checking.