daewoo racer ECU

[jalalp1]

hi there
my daewoo model is 1992 but the ECU model 's 1994
i do not know who change the ECU
i have some problems with car
when car is moving if i let gaer in any position rpm is 1250-1500 or some time higher
my fuel percent is 12lit for 100km!!!
now the question is "the ECU must be changed?"
sorry for bad writing english

[Daniel]

ECU compatibility should be confirmed by part number.

ECU.JPG

It's quite normal to have a high idle when car is coasting over 20 km/h.
First check engine coolant temperature sensor and oxygen sensor for you bad fuel mileage. Then check MAP sensor, fuel pressure and injector performance.
Are your spark plugs sooted?

Of course the basic maintenance is already done.

[jalalp1]

yeah sparks plugs sooted
my question is should i change ecu ?
my car model is daewoo racer GTE 1992 and ecu model is daewoo racer 1994Gti

[Daniel]

yeah sparks plugs sooted

Too rich mixture.
Again: First check engine coolant temperature sensor and oxygen sensor for you bad fuel mileage. Then check MAP sensor, fuel pressure and injector performance.

my question is should i change ecu ?

Very last thing to do! Seldom guilty.
But check the 8digit part number on the ECU sticker for compatibility.

[jalalp1]

thanks my friend
coolant system is ok
temperature always is normal
map sensor have no problem
engine have not oxygen sensor
carbon sensor ok
injuction sensor time is 2.1
when i shake ECU connectors engine works bad and good and some problems Precedes like:
some time i see black smoke from exhaust
some time engine turn off and i must start again
some time rpm rise up to 3000 and some time go's to 500!!

[jalalp1]

hi
i changed the ECU connectors
now rpm is ok and when i toch connectors not happened
when the car is moving and gear in no position the rpm is 1100
now my question : can i program ECU with 93 software?
1993 software is available for program?

[Daniel]

Seems you have pinpointed the problem.

when the car is moving and gear in no position the rpm is 1100

It's quite normal to have a high idle when car is coasting over 20 km/h.

Does engine speed comes back to normal around 850RPM at full stop?

Not a clue about reprogramming ECU.

[jalalp1]

Does engine speed comes back to normal around 850RPM at full stop?

yeah
when car stoped rpm come down 850
yesterday when i was in traffic temperature comes up and when fan start check light turned on and after cooling engine (fan stop)check licght turned off! is that for problem in cts?( coolant temperature sensor)is cts Destruction?

[Daniel]

So you idle speed is normal now. Good!
---------------------------------
Temperature problem?
Is coolant level OK? Clogged radiator? Defective thermostat? Oil/water mix (mayonnaise)? Bubbles/high pressure in surge tank? White exhaust smoke?
...

There are 5 marks on temperature gauge. Where was the needle gauge when fan started + check light?
You can read stored error code(s) by mean of the "paper clip" method.

[jalalp1]

Is coolant level OK? Clogged radiator? Defective thermostat? Oil/water mix (mayonnaise)? Bubbles/high pressure in surge tank? White exhaust smoke?
...

level ok, under mark 1 (in white area)
radiator not clogged
no mixing in water and oil
tank door ok
no white smoke

There are 5 marks on temperature gauge. Where was the needle gauge when fan started + check light?

when fan start needle gauge is in level 1 and check light turned on
when fan stop and check light off needle gauge is under mark 1(between first and mark 1 in white area)
how can i take error code from ECU?
by a wire?!which pins???
what cts error code?

[Daniel]

Level 1 out of 5 is approx 70°C.

Temp Nubira.JPG

How to read error code.
http://www.youtube.com/watch?v=sRoSMhEL3Ms

Jump A&B.

ALDL 12 pins.JPG

Switch ignition ON without strating engine.
Count flashes.
Exemple for Espero:

Espero.JPG

[jalalp1]

i can't take error code
when i plug a wire to A & B pins and open switch not happen!

[Daniel]

With ignition ON and engine not running (and A & B jumper removed!) is the orange check lamp steady ON?

[jalalp1]

yes
in normal mode when switch in start mode(engine off)check light is on and when engine turned on check light turned off
?!!!

[Daniel]

yes
in normal mode when switch in start mode(engine off)check light is on and when engine turned on check light turned off
?!!!

Then A & B connected and ignition ON the check engine light must flash. At least code "12".
In my terrestrian world I'm afraid I can't help you any further my friend.