sparkster

If i'm correct in saying - all i have to do is disconnect, for example, the negative terminal from the battery.

If so how long do i need to leave it disconnected?

I'm reseting it because i want to test some NF Octane booster this afternoon on the original 93wrx jap ECU. I'm going to fill up, with optimax and OB, reset the ECU, drive for a while than give it some welly and watch my Knocklink.
Thanks

Mark

sparkster

i'm sure there must be somebody on the net at the min who can tell me - pls

ragnarock2

Look under the dash, there are 2 green connectors, and 2 black connectors, connect them together (i.e. green to green and black to black), loads of stuff will whir and click, start the engine, and go for a 5 min drive, the check engine light will flash on and off (should do so every second in a regular pattern, if not, you have something wrong and will need to check for the fault code from the pattern of the check engine light). Disconnect the wires, and robert is your mothers brother.

sparkster

so you dont just disconect the battery!! Man i'm clueless.

Am i taking a risk doing this away from home at a petrol station? Do you think i should do it at home?

sparkster

how should i drive during that five minute drive? Nice n easy, fast and slow??

richiewong

As above, connect the green and black connectors. Turn ignition on without starting the engine, fully depress the accelerator pedal then bring it "half way up" for a couple of seconds before releasing it. Lots a strange noises under the bonnet and start engine. Take a steady drive without flooring it until CEL starts to flash at a steady pace. ie no faults detected, jobs a good 'un

sparkster

thanks - i'm off to get fuelled up

skoosh

What side of the dash? Drivers or passenger? I can't see any connectors.


Skoosh.

ragnarock2

Drivers, they may be wrapped in insulation tape.

sparkster

Found this on search

"How to re-set your ECU unit.
ECU clear memory procedure is as follows for auto and manual transmissions:

With engine at operating temperature, turn engine off. Place gear shift lever into park (auto transmission cars only)
Locate the two ECU check connectors, for most cars they are located under the steering column and consist of a black plastic male and female connector, and a green male female connector. The exact location of the connectors varies with the different year models, but generally they are located under the steering column on the drivers side.
NOTE: sometimes they are still taped over with some small amount of plastic tape, so look hard, they will be there!
With the ignition OFF connect black to black and green to green.
Turn on ignition, do not start the engine, (and for auto transmission, cycle the gearshift lever from park to neutral and back to park ), depress the accelerator pedal to full throttle and hold for a few seconds, and then release.
Start engine and then drive for at least one minute, keeping road speed above 11 Km/h.
ECU is now re-set.
At this point the check engine light should start to flash the all clear signal (steady 1/2 second interval flashes). If the check engine light does not flash, or indicates some other sequence, there is a fault present in the system, and should be professionally checked for necessary repairs.
Once, stop the car and turn off the engine.
Disconnect the plugs.
Job complete"

Leslie

Search is v useful. It is possible to reset your ECU by disconnecting the battery for an hour and then reconn. Takes a while for the memory to drain away.

Les

ragnarock2

Above method is quicker and will not play havoc with some alarm systems!

Gedi

loads more info here:

http://www.saxonfields.freeserve.co....iag%20Page.htm

CataIunya

I have never have been able to do a reset on a my97 with CEL connectors.

StickyMicky

i just disconnect the batt negitive and go and have a cupper and sum buiscuits for an hour lol

ozzy

Or you could just remove the ECU and take it inside with you

The dash connectors is the quick method though

Stefan