Ecu Issues R33 Gts25t - Ecu Guru Required

[turbs33]

Hi all,

I have a series 1 r33 manual with all standard mods. I sourced a new ecu which has been remapped. when the new ecu is plugged in problems arise...

Start car. This seems fine, idle high on cold map as expected. Note i have not tried revving the motor.

Now, here is the really weird bit. When moving the gear stick from side to side revs drop like a small miss and i hear the fuel pump cut out and turn back on. Now clutch in and select a gear and bang she stalls (clutch still in). engine check light is now on. Car needs to be turned off completely to clear engine check light.

Now with motor not running and ignition on (car turned off fully to clear engine check light) i move the gear stick as described above and can hear the fuel pump start priming again. So i switch on keys till red lights on dash (fuel pump primes) then after the fuel pump stops priming i move the gear stick to either the left or right and the fuel pump primes again. Something seems top be triggering this.

I unplugged the new ecu from the loom put my old ecu back in and she works.. Replugged the new tuned ecu into the car ensuring loom was connected tightly and this same thing resulted.

Is there some kind of switch around the gear box which sends signals back to the ecu?

OK ECU serial numbers etc

New tuned rom ecu (problem ECU)

23710-21U01

MEC-R521 A1 4321

Old standard ecu (Working Fine ECU)

23710-21U01

MEC-R521 A1 3X22

Any help would be much appreciated.

Edited July 12, 2007 by turbs33

[turbs33]

Also the new ECU has this sticker on it.

I know not really clear but if anyone can read Japanese and make any of it out id be interested to know what it says.

[sweetr33]

and you've checked for wires shorting near computer or gearstick?? thats the wierdest thing ive ever heard good luck

[MANWHORE]

it's not wires shorting out, which is very strange. Same thing happened on an auto car - as soon as the car was put into d, it stalled.

As both ecus are mec 521, that means that the ecu is the right one (sI ecu on sI car)

[Adriano]

I know on my z32, the ecu raised the revs as soon as the gearstick was put into gear. Maybe try checking the wiring diagram to see if there is a sensor(im betting there is)You could try unplugging whatever wire detects that, if its the only problem with the ecu, you may have to live around it.

[turbs33]

Yeah there is definitely no shorting of wires, I have checked the loom well, and once the stock ecu is back in all is fine again. Just went for a drive then to make sure..

[sweetr33]

on my 33 there is a sensor on the clutch pedal box that raises revs at idle when u push clutch in, but again no answer to your prob

[RB30-POWER]

sounds like the map in the ecu is corrupt, when the neutral position switch is turned on/off (by moving gear selector) its turning fuel pump on and off.

the auto ecu uses this switch to raise idle up and down for when it goes in gear.

the ecu map is corrupt mate, and its using that input to do something other then it should.

or other alternative is the ecu is from another nissan vehicle that uses a different pinout.

[turbs33]

Thanks guys..

That makes good sense RB30-POWER.

Cheers mate

[Adriano]

Just unplug the clutch pedal sensor, and the gear position sensor and go for a drive, maybe you will just have to disconnect a wire from the ecu and it will be sweet