hi i just tried to reset my ecu, i put the green an black plugs together turned on ignition pressed the gas right down then to half for 2 seconds but there was no engine check light on. i drove round for ten minutes expecting it to start flashing but nothing happened. i could hear a clicking sound before i started the engine but nothing else. ive unplug the connectors now. i think im doing it wrong.

 

ECU Reset and Error codes
Turn OFF the ignition

Connect Error code Connectors and Test Mode Connectors :
2 black connectors under dash, connect black to black and 2 green connectors under dash, connect green to green, they are by your left knee when sat in the drivers seat and often taped back to the loom if they haven't been used before.

Turn ON ignition but don't start the engine

Engine Check lamp comes on

Press accelerator pedal to the floor

Then return it to the half-throttle position and hold it there for two seconds

Release foot off the pedal completely

Start the engine

Check engine light error code is indicated by Pulsing lamp

If an error is detected then Check the ECU Code

If no error is detected - drive the car sensible for a couple of minutes
i.e. until warm (do not use boost or high rpm!)

When the ECU has been reset the Check Engine Light will flash

An Error Code is indicated by a flashing check engine light
of varying length of flash,
a flash of around once a second is the okay code and indicates all is well.

If an error code is detected Check the ECU Code

Turn ignition OFF and Disconnect Connectors

If there is a fault Check the Appropriate Sensor


Error Codes
An Error code is defined as a slow flash followed by fast flash
i.e 2 slow and 3 fast = 23 Mass Airflow sensor.
A continuous on/off at the same speed is no fault found.


Code Fault
11 Crankshaft position sensor

12 Starter switch

13 Camshaft position sensor

21 Engine coolant temperature sensor

22 Knock sensor

23 Mass air flow sensor

24 Idle air control solenoid

31 Throttle position sensor

32 Oxygen sensor

33 Vehicle speed sensor 2

35 Purge control solenoid valve

42 Idle switch

44 Wastegate control solenoid valve

45 Pressure sensor / Pressure exchange solenoid valve

51 Neutral position switchthat should help

 

sound right..

if you connect just the black connectors and turn the ignition on wihtout the engine it should flash any error or the okay code..

Do you get the check engine light come on with ignition on and no engine and then go off when you start the car? if not then the bulb may have been removed or the car is not running on the standard ecu perhaps.

Simon

 

thought u may have recognised the info i posted

 

Engine Check lamp comes on

mine dont come on ???

 

it will do mate,read the info very carefully,if u aint doin it wrong then the only thing i can think of is that the bulb for u cell is fooked?????like i said read it carefully!

 

no light

 

?????

 

swap bulb in dash round or check it. cud of blown

 

check the bulb is in the dash then..

Or remove kick plate and check it has standard ecu fitted

Simon

 

that would be a pain to do. theres 4 black plugs under my dash but only 2 connect

 

wheres kick plate? how would i know if standard its a 97 uk.

 

copy right, copy right!!!!!

 

if you connect just the green connectors and the rad fans pulse and all the relays click on and off then you have the standard ecu fitted..

 

yeh could here clicking sounds when i connected black to black and green to green.

 

there 2 more black connectors and a big yellow one hanging down with the others ??

 

u have to expect copy right on some of the best info online

 

bulb gone then

 

the yellow is the OBD connector the dealer would use to check for error codes on the select monitor equipment.

the two black connectors you need have two wires in on your year of car.. the other black ones have just a single wire iirc and I think there is only one black one and nothig to plug it into.

but you need a cel light to come on when you turn the ignition on for you to be able to read the codes.. obviously it has blown or someone has removed it to hide an error code

Simon

 

the two black ones i can connect only have one wire the ones i cant connect have two wires.

 

may be I remember it wrong on the 98 but regardless if there is no CEL on with ignition which then goes off when you start the engine it won't work anyway

 

can i just dissconnect the battery ?

 

that won't magically fix a blown bulb

 

i mean will it reset my ecu gonna have to start a new thread about how to get to the bulbs in the dash.

 

Thanks for your help simon youre a gent. im saving for a remap so ill be in touch.

 

does your check engine light come on for a second or two as u turn your ignition and start the engine as if u were normally taking it for a drive?if it dosent then its a bulb issue.

 

I beleive he is saying the bulb doesn't come on ever

battery disconnect erases some errors and some of the stored data but obviously you won't know if there is a fault with no bulb

 

Obviously having a working 'check engine' light is useful to say the least, but if you want a reset/read of fault codes and can't do it yourself, surely your friendly subaru dealer armed with a select monitor will kindly do it in exchange for some (or a lot) of hard earned cash!

 

if ive followed your instuctions and the bulb isnt working my ecu should now be reset.i did everything you need to do but without the light coming on

 

great but you could have several error codes and won't know about it..

get and replace the bulb