RB25DE Auto in limp mode?

[MixedMag]

alright so about 2 years ago i bought a auto NA r33. it has always had an issue where it seems to be stuck in 3rd gear or limp mode as you would say. ive replaced coilpacks, spark plugs, coil pack harness and the gearbox was swapped out for a better condition 5 speed auto box

Im yet to look at the AFM, O2 sensors or something else that could be causing the issue.

what exactly could be causing this issue as ive had no luck with facebook groups or other skyline owners.

 

any help would be appreciated 

 

[KiwiRS4T]

I don't believe the R33 has a limp mode as such so you just have a fault to find. If its the same with the new box then it could be in the wiring or the TCU.

Here is a fault finding plan I found somewhere else (if it doesn't work you may have to find a workshop with a scan tool):

 

OK, have noticed a few people having trouble with their automatic transmissions & some asking how to get codes out using self-diagnostics.
Nobody really seemed too sure so I thought Id create a thread about it & if people can reply, confirming that this works (its been a while...) maybe it will get sticky'd as its useful info for anyone with an auto...

OK, to get into auto-trans self-diagnostics mode, do as follows:

*Have car at operating temp, in P with O/D on
*Start engine, power light goes out in 2 secs
*Turn ignition off
*Move to D, O/D off
*Wait 2 secs, turn ignition on
*Wait 2 secs, move selector to 2
*O/D on
*Move selector to 1
*O/D off
*Press accelerator fully to floor & fully release

Codes are now flashed using power or snow/power buttons (dependant on model)
Sequence starts with 1 long flash. If all is OK this will be followed by 10 short flashes.
Errors are indicated by a long flash in the sequence of short flashes
eg. 1 long flash, 6 short flashes, 1 long flash, 3 short flashes is code 7

Code descriptions are as follows:

#1- Revolution sensor shorted or disconnected
#2- Speed sensor shorted or disconnected
#3- Throttle sensor shorted or disconnected
#4- Shift-solenoid A shorted or disconnected
#5- Shift-solenoid B shorted or disconnected
#6- Overrun clutch solenoid shorted or disconnected
#7- Lock-up solenoid shorted or disconnected
#8- Fluid temperature sensor disconnected or control unit power source damaged
#9- Engine-revolution sensor shorted or disconnected
#10- Line-pressure solenoid shorted or disconnected

Best of luck to anyone suffering problems & as I said please confirm if this worked for you

[MixedMag]

so i tried putting it into the self diagnosis mode, but for some reason after i finished the sequence, nothing happened. i tried doing it multiple times thinking maybe i didnt do it quick enough but it didnt make a difference

[Ben C34]

The issue will be related to the actual auto box, not other stuff related to the engine.

Not sure what you mean 5 speed auto, that doesn't exist for these cars.

 

[GTSBoy]

Attempts to put 5 speed auto into 4 speed auto car are going to end in WTF threads.

[Rusty Nuts]

2 hours ago, Ben C34 said:

Not sure what you mean 5 speed auto, that doesn't exist for these cars.

Sorry Ben, you are completely wrong the de auto R33 is a 5 speed or 4 speed. Only turbo's and very late de's are 4 speed.

Edited September 28, 2019 by Rusty Nuts

[Rusty Nuts]

Frame: R33, production period: from 08.1993 to 11.1998

Manufacture period body engine suspension drive grade transmission

08.1993 - 01.1995 4S RB25DE IRS 2WD GTS25 AT.F5

08.1993 - 01.1996 4S RB25DE IRS 2WD GTS25/G AT.F5

08.1993 - 01.1996 2K RB25DE IRS 2WD GTS25 MT.F5

01.1996 - ...2K RB25DE IRS 2WD GTS25/S MT.F5

08.1993 - 01.1996 2K RB25DE IRS 2WD GTS25 AT.F5

06.1994 - 01.1996 4S RB25DET IRS 2WD GTS25T/G AT.F4

01.1996 - ...4S RB25DE IRS 2WD GTS25/S MT.F5

01.1996 - ...4S RB25DE IRS 2WD GTS25/S AT.F4

01.1996 - ...2K RB25DE IRS 2WD GTS25/S AT.F4

and thats all she wrote

[Rusty Nuts]

3 hours ago, MixedMag said:

i bought a auto NA r33. it has always had an issue where it seems to be stuck in 3rd gear or limp mode as you would say.

Have you checked the Brown plug situated on a bracket near/below the fuse box. It is clustered with two other plugs and if disconnected or damaged will lock the auto in third, find it, unplug and clean with electrical cleaner. If you cant find it let me know, I will photo the plug and post it (just not now its pissing with rain)

[Ben C34]

1 hour ago, Rusty Nuts said:

Sorry Ben, you are completely wrong the de auto R33 is a 5 speed or 4 speed. Only turbo's and very late de's are 4 speed.

Wow, that is surprising. Thanks for the info. Never played with the de's, mistakenly thought would be same as turbo. Being non turbo needs all the help it can get!

[Rusty Nuts]

38 minutes ago, Ben C34 said:

Being non turbo needs all the help it can get!

Mind you I reckon a five speed behind the Turbo engine would help heaps on long distance drives, the 5th is only a push button overdrive after all, if you dont press the button you are driving a four speed.

[MixedMag]

yeah not too many people are aware the DE's came with a rare 5 speed auto variation. believe it or not the 10A fuse for the A/T control module had blown. and all seems fine now. thanks for the help though guys

[Rusty Nuts]

1 hour ago, MixedMag said:

believe it or not the 10A fuse for the A/T control module had blown.

Mate you are shameless, you have changed half the engine bay components, but for two years you didn't check the fuses. Incredible.