Like God smacks us for thinking bad thoughts, Codes P1884 (35), P1590 &P0335

wdalyinnh

New member
Dec 1, 2013
3
0
Brookline NH USA
So this disco is killing me. I was getting the three Amigos as well, but a new front hub and axle seal seems to have fixed that part of it. So now she starts up and runs great (new rear ground strap, new engine crank position sensor, all the wires checked and re-loomed (is that a word?) including thru the hole under the gear shifters, tranny position switch was taken apart and checked (no wear really) but she still doesn't want to be happy. So we're driving down the road about 50mph and it feels like you ran over a 4" dia pipe (only one jolt though). The "check engine soon" light flashes but doesn't stay on, the two green gear lights and the "D" for drive go flashing and you're only allowed third gear. Pull out the HawkEye Total reader and find the following codes:



Live transmission data shows something weird:

Gear Switch

1000 Invalid (P) ------------so she's in park, but why Invalid?

Program Selector

OPEN-------------------------If you hit the Mode button for sport it's apparently a momentary close



Rest of the Codes:

Tranny - P1884 CAN Message (Engine Speed) Invalid. INTERMITTENT.

Engine - P1590, Rough Road Signal, Implausible Value, Fault not present and static

P0335, Reference Mark, Transduce (Reluctor Wheel) Value Not Plausible. Fault NOT Present and Intermittent.



Restart and all lights go away and you're off to the next surprise approximately 15-30 minutes in. WTF.



Has anybody solved this one? Is this a possible scenario for brake pads catching randomly? I've had no floods, the fuse box looks fine, the rest of the grounds look fine, the mice didn't get to the wiring under the dash or by the computer on the footwell wall.



Bill Daly, Brookline NH I can't build any acoustic guitars 'till I get this Disco figured out.
 
Last edited:

jastutte

Well-known member
Nov 10, 2009
350
33
dealing with a similar issue on my 2001.

what was your solution? add transmission fluid?
 

JohnB

Well-known member
Oct 18, 2007
2,283
8
Oregon
Obviously more to the story on this one.
Why were you taking apart the transmission park switch?
Usually when you go in limp mode it's a ground issue or battery connection issue.
The loud bang is confusing me. Seems something mechanical broke or is about to.
 

jastutte

Well-known member
Nov 10, 2009
350
33
my issue is not battery related. brand new battery and alternator. both putting out the proper voltages.

currently, if i start in 1st i can move. drive until i hit 3,000 RPMs, foot off the accelerator, shift into second, repeat until into third and fourth.

if i keep moving i don't need to manually shift. if i come to a complete stop then i manually shift down to first and repeat the process again.

if a complete fluid flush doesn't fix the issue i'll start my own thread.
 

wdalyinnh

New member
Dec 1, 2013
3
0
Brookline NH USA
Interesting how the thread expands. So I took the XYZ switch apart because it was suggested to be the root of the problem. There's no loud bang, it's more like a response by the transmission to switch to jump to the wrong gear or something because of the CAN buss error, thus the allusion to some invisible hand. Battery is new, alternator works great. The other day I got the limp mode without the hand of God, just the lights. Goes away on restart and then an hour later she doesn't want to fire up in a parking lot. Wife drives me nuts believe she has some magical key turning powers that I lack and I forget to pay attention to see if the tach is working or not. Pop the hood and pull on harnesses with no belief that I won't be calling the kid and telling him where to find the tow strap and she starts up and gets us home without incident.