Terrano TD27 ETi fly by wire IP fitted Auto gearbox going into limp mode

[dagwill]

Hi all,I have 96 Terrano that I have fitted a fly by wire [manual] Injector pump, I should also state that i fitted a chinese QD32 at the same time i fitted the IP.

For some reason the Tacho stopped working on change over.

Drove great for a month then gearbox started going into limp mode where it would lock in 3rd gear,, take off in 3rd and just stay there.

It would never do it cold, every time i now use it it drives normaly for about 15 to 20 minutes ,then limp mode. If i stop and turn the engine off, then restart its fine for a few minutes then limp mode.

I wondered if it was temperature, so fitted better A/T  cooler,,,,,, no change.

Replaced throttle pos. sensor,,,,,, no change, note i altered the throttle so it opperates the fly by wire injector pump and retains TPS for auto gearbox.

Any help would be greatly appreciated

Thanks David

[Slartibartfast]

You're well out of my depth here--I don't think I've ever seen a Nissan diesel in person, much less a modded one. However, if it's got the same RE4R01A four-speed that we got up here, I would expect it to have similar self-diagnostics. If it's going into limp mode, that should mean it's got a code stored. 

 

The WD21 has a blinky-lights diagnostic system for the trans. If it's in limp mode, turn the ignition off, and on again, and it'll flash the "power" light (or the light in the E-AT switch, for round-dash) to tell you what it was upset about. IIRC you can also jumper a couple of wires under the dash to trigger the self-test. But (assuming models changed in Australia at the same time as they did up here,) it sounds like you've got an R50.

 

The R50 retained the blinky-lights OBD, but hid it behind a stupid Konami code. Start halfway down page 42 of this section of the '96 manual (where it says "SELF-DIAGNOSTIC PROCEDURE, no tools.") There's a little dance to do with the ignition switch, the shifter, the overdrive switch, and the accelerator, and then you have to match the flashing overdrive light to one or more of the various possible codes. I recommend recording the overdrive light with your phone so you can play it back without having to do the dance again.

 

Either way, if you can make it spit a code, then you'll know what to chase down next. If it's not getting a tach signal, I'd expect it to code for that, though I don't know why it would've taken it a month to notice that.

 

And obviously if yours has OBDII (not sure when that came out down under, or whether yours still has it given you're running an engine swap and manual pump), it should throw codes there too, and with a much less stupid interface.

 

Good luck!

[dagwill]

Thanks for the link and info, all your input is greatly appreciated.

When i have run out of ideas some alternative paths are just what i need.

I hate that feeling of just not knowing,,, thinking i know there is an answer somewhere, i just cant find it.

Tried the flashy thing,, might disconnect the battery and see if the same patern comes up.

Got    short long short short short short long short 

Hmmm   only a total of 8 flashes, a long pause and same pattern of 8 flashes.

Thanks David

[Slartibartfast]

Eight flashes, that's weird. Must be a different computer for the diesels, and sadly I have not found a service manual for anything on the diesel trucks other than the engine itself. Looking through the codes, I don't immediately see two I'd expect to be absent on a diesel.

 

Again, given you know something's not working with the tach signal, I'd chase that first.