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I’m going on just a basic understanding, but... The kickdown on my s4 is a button switch located under the accelerator pedal, when you floor the accelerator all the way down you press that switch and it sends a signal to the automatic transmission to downshift or act in a more aggressive way so to speak.
With regards to the relay, again I only have a basic understanding, but the last two numbers generally indicate a newer version of the original, so theoretically an 01 should be a compatible replacement for an 00.
If I am wrong about any of that I’m sure someone will add the appropriate correction.
I think I saw on some website that the 928.618.109.01 was for 84 and up for the 928, so it maybe that this relay is the successor. If anything, I could just open up the relay and remove the diode. I'm sure it must be soldered onto a circuit board and should be easy to remove. I'll try next week with the relay as is and see if it works. If it does ¯\_(ツ)_/¯ I don't care beyond that.
The picture I'm painting in my head as to what happened to this 928 was that some mechanic tried to fix an intermediate issue where the car won't start again after it warms up, and you had to wait for it to cool down before you can start it again. Which could be attributed to the bad EZF and a MAF that was twice out of spec according to Rich. So what someone did was that they took out the kickdown relay and replaced it with this generic VF4 relay, and the car wouldn't start. So the person went nuts trying to fix it and cut and spliced wires all over the fuse panel, which eventually would have disconnected the incorrect kickdown relay. Then another fuse panel was used and less wires were bypassed, but enough to get around the incorrect relay. Someone had even put a 12v power line from the battery to the "X" ignition power which left the X-Relay on even with the ignition switch off, which might explain why the battery was dead when I came back a week later. The car was left for dead and the crappy not even twisted together wires corroded and lost connection.
Anyway, I'm going to replace the relays for a number of components like the windows and the wipers cause they don't work, and if someone screwed up the relays I've found so far, who's to say they didn't do the same to the rest? Flush the coolant and change the thermostat cause that's all bad, and even change the transmission fluid and filter. Gonna use Valvoline Max Life synthetic ATF cause that stuff has worked well for me in other cars. Gonna get that tow hitch on the Jeep and see if I can get this car going.
Here's a photo of the inside of that 928.618.109.01 downshift relay. Relatively simple components that can be easily replaced if something goes wrong. I don't see anything visually bad, so I just put some dielectric grease inside the contact points and closed it up.
09-15-2018 | 01:00 PM
