DIY Honda ECU Repairs- P30 P08 P27

[Beec85]

Hi E-TECH ,
I have a question . if normally switch on the car the engine light will off after 2sec , it mean no error code its ?
at this moment , I connect the two pin plug n check the error code , the engine light just on and not blind at all .
So , its normal or problem ? Thanks .

 

[E-Tech]

Hi E-TECH ,
I have a question . if normally switch on the car the engine light will off after 2sec , it mean no error code its ?
at this moment , I connect the two pin plug n check the error code , the engine light just on and not blind at all .
So , its normal or problem ? Thanks .

Hi... Yes no blink means no error code. However there are cases
when no error code but have Ecu problem.
If car drive ok then its ok.

 

[Beec85]

Thanks for reply E-Tech .. Hope not ecu problem la .. Any hits if ecu problem ?? Can check ?

 

[E-Tech]

Thanks for reply E-Tech .. Hope not ecu problem la .. Any hits if ecu problem ?? Can check ?

Hi... If free then take out Ecu and open cover.
Take some good close up picture and send me.

 

[Coupe-r]

Hello again E-Tech.

I have 2 P08 ecu's that give a SOLID CEL (but primes fuel pump relay correctly on tester and in car)
SOLID CEL, NO CODE GIVEN.

On the moates engine sim BOTH ecu's pass with NO CODES. Run PERFECT on the tester.

Both ecu's are chipped and were working correctly for quite some time in cars.

Both have FLAWLESS ecu soldering and both ecus are in excellent visual condition. Both with the main CAP replaced. (wasn't leaking anyway)

ECU's give a SOLID CEL with J1 removed also.

Q: Where should I start? Is it perhaps IC19 data communications IC?

EDIT: I put J4 back, and unplugged the VTP sensor. I get a code 22 when I bridge service connector.
I remove the service check connector and the ecu keeps flashing 22 it doesn't go back to solid. Even when I key off key on it stays in code check mode with 22??

I have a feeling it might be the IC19. BOTH P08 have the same behaviour.

 

[E-Tech]

I dun hv and trust sim.
Let's talk about test in actual car.
Fuel pump prime but can the car start?
If yes, can rev pass 4500 rpm?

And post a good picture of ic19...

 

[Coupe-r]

I don't trust sim either!

Car primes fuel pump, car starts and runs fine.
Yes goes over 4500rpm

 

[E-Tech]

I don't trust sim either!

Car primes fuel pump, car starts and runs fine.
Yes goes over 4500rpm

Hv u touch up ic19 or changed it already?
That should fix the problem...
You are doing data log on those Ecu correct?

 

[Coupe-r]

I haven't touched or changed IC19 yet.
If IC19 is damaged should I be able to datalog?
I'll try datalogging tonight before I change ic19

 

[Venzonic]

Hi E-Tech, u got pm..hv sent u a pm few days ago, looking for your help. Do reply me pls..thanks.

 

[E-Tech]

Hi E-Tech, u got pm..hv sent u a pm few days ago, looking for your help. Do reply me pls..thanks.

Hi sorry for late reply. PM ed.

 

[Coupe-r]

Just an update, I replaced IC19 twice.
Also RM6 was replaced.

Still CEL.

BUT I did take it across town to try in someones car I was tuning. PASSED!
Drove back across town, ECU knocked around in boot. Back into my car and SOLID CEL, datalogs fine, no codes. But stuck in diagnostic mode.......

I think next trick is to remove J1 and install J4, see if it's stuck in diagnostic.
If so i'll remove the 28 pin socket.

EDIT: Found the issue with the two P08 I have. Unplug my 4 wire heated 02 and the CEL goes away. Those P08 must have an issue with voltage on A6 heater pin. E-tech told me to test QM3 so will post result and the fix asap

 

[E-Tech]

Just an update, I replaced IC19 twice.
Also RM6 was replaced.

Still CEL.

BUT I did take it across town to try in someones car I was tuning. PASSED!
Drove back across town, ECU knocked around in boot. Back into my car and SOLID CEL, datalogs fine, no codes. But stuck in diagnostic mode.......

I think next trick is to remove J1 and install J4, see if it's stuck in diagnostic.
If so i'll remove the 28 pin socket.

Ok.....:

 

[neon626]

Hi,
car Accord type-r 2001. ecu p28+chip, after 1 year perfect work, blinking cel. But car run great. In another p28+ this chip all fine. Bad 74hc373? (In video 4000rpm boostgenerator for dragstart, car is NA)
bad ecu p28 after 1 year perfect work - YouTube

 

[E-Tech]

R

Hi,
car Accord type-r 2001. ecu p28+chip, after 1 year perfect work, blinking cel. But car run great. In another p28+ this chip all fine. Bad 74hc373? (In video 4000rpm boostgenerator for dragstart, car is NA)
bad ecu p28 after 1 year perfect work - YouTube

Hi
Very odd kind of blinking...
Put in a different chip and test.
Looks like the Ecu in "limp mode".
If another chip without lauch control and behave
the same way the yes in limp mode.

The odd blinking could be just a wiring issue.
Error code blink are slow and consistent.

 

[neon626]

In different car, chip without launch, all repeats(civic b20b allstock)
CEL blink like injector pulse, on full throttle no blinking

 

[E-Tech]

In different car, chip without launch, all repeats(civic b20b allstock)
CEL blink like injector pulse, on full throttle no blinking

Hi..
I'm puzzled too..
WhatsApp me some pictures.
Let me see if I can see anything...
+60 19 654 7373.

Tq

 

[Coupe-r]

From watching the video that looks like a soldering issue inside the ecu to me.
Most likely the latch chip but COULD be the 28 pin chip.

With the ecu cover off and the car running, push down on the latch chip then the chip. See if you can get CEL to go away or come back.

That's a solid CEL though no doubt from ECU vibrating with engine running......
Connect.... not connect. connect. and so on

 

[E-Tech]

Smell something burning?

 

[E-Tech]

ECU burning!

 

[levin818]

P30's final destination

 

[E-Tech]

P30's final destination

Too smelly to repair!

 

[Bryan L]

hi,
my eg can start as normal, but after start the idling rpm intermittent up and down, can felt some jerk also when change gear during drive,fuel consumption high,got black smoke. Foreman did help to put jumper check error with controller, but no error code found. He said mainly MAP sensor or ECU. I do replace with 2nd hand MAP sensor but the problem still remain. Due to no have offline ecu to test, are there any way to narrow down the problem?

ps:my english not good, hope your can get my mean.TQVM.

 

[E-Tech]

hi,
my eg can start as normal, but after start the idling rpm intermittent up and down, can felt some jerk also when change gear during drive,fuel consumption high,got black smoke. Foreman did help to put jumper check error with controller, but no error code found. He said mainly MAP sensor or ECU. I do replace with 2nd hand MAP sensor but the problem still remain. Due to no have offline ecu to test, are there any way to narrow down the problem?

ps:my english not good, hope your can get my mean.TQVM.

Mmmmm NO but u can open the ecu cover and hv a look inside.
If hv "burn" mark or brown spot high possibility it's the ecu.

You hv std engine and ecu?

 

[Bryan L]

Yup, my is std engine and ecu...I give wrong info, my is eh5 year 95.
I will check the ecu tomorrow..i also wanna find the second unit map sensor and test again..thanks ya.
Actually I new with all of this, when the third foremen told me high potential is that two item bad only I start to search online.
Do I need to do ecu reset when replace the map sensor?coz the foremen ask me jz install and see got recover or not when I found the map sensor, but I got read some write need to do after troubleshooting.