DIY Honda ECU Repairs- P30 P08 P27

[g4i8y0t]

This board is double-sided PCB, you need to solder the caps on both sides.

 

[_firecracker]

This board is double-sided PCB, you need to solder the caps on both sides.

thanks, i tried this as well and still code 14

 

[g4i8y0t]

Hmm... I also dunno why, you'll have to wait for the sifus for their opinion.

 

[E-Tech]

thank you for your suggestion. I just switched out all of the caps and it still gives a code 14

Hi...
There are 3 caps with value 33uf 35v.
1- Have u replace with same uf value?
2- check these 3 caps -ve legs with multi meter.
There should be continuity between the -ve leg because
all are connector to ground.

Try this first .....

 

[_firecracker]

Hi...
There are 3 caps with value 33uf 35v.
1- Have u replace with same uf value?
2- check these 3 caps -ve legs with multi meter.
There should be continuity between the -ve leg because
all are connector to ground.

Try this first .....

C15, C19, and C21 were all replaced with P5549-ND from digikey, i found that on PGMFI awhile ago and ordered the set. I did not think this would be the cause of code 14 though.

My multimeter beeps on the negative leads of all those capacitors.

 

[E-Tech]

Check tis transistor then...

 

[_firecracker]

Check tis transistor then...

Thank you for your help. Will either of these work?
10pair 2SA970 2SC2240 A970 C2240 Transistor | eBay

Digikit.ca :: Components :: Transistors :: Transistor C2240, Pack of 2

 

[E-Tech]

Thank you for your help. Will either of these work?
10pair 2SA970 2SC2240 A970 C2240 Transistor | eBay

Digikit.ca :: Components :: Transistors :: Transistor C2240, Pack of 2

Yup..... 2SC2240 =C2240

 

[Spoon84]

Hi, newbie here...
I got problem with my P08 ecu. After start-up the engine about 1 minute, the idle go up & down about 3000 rpm. I was using P08 for hondata. I checked on pin A9 with multimeter the voltage start decreasing from 12v to 1.5v cause my IACV open. I already swap with 2nd hand IACV got from halfcut. I swap with original ECU the problem went off. Any ideas? Thank in advance

 

[levin818]

thanks, i tried this as well and still code 14

I am doubt its the components issue. Try clean up your board with high quality thinner, remove ALL dirty residual that reside in between the pins.

---------- Post added at 06:28 PM ---------- 6 hour anti-bump limit - Previous post was at 06:19 PM ----------

If problem still exist, mean that you have disconnection in you IAC circuitry due to corrosion. You need to trace it with great patient.

 

[fazrul80]

hi Bro,
Hi.....
Sorry to ask..
i'm already change all caps, c16, c17, Q3 E, IC12 and QM3...
when i test to my car CEL lights goes off after 2 seconds but car won't start... when i checked, the main relay just sound for 1 click and no 2nd clicks...it's coz fuel pump not primes..when i change another main relay it's just same symptom....
any advise bro? tq...

---------- Post added at 12:14 PM ---------- 6 hour anti-bump limit - Previous post was at 10:54 AM ----------

Oppss...sorry not IC12 but IC17 (TA8903SN)....it's P27 T00 ecu...
TQ in advance....

 

[E-Tech]

hi Bro,
Hi.....
Sorry to ask..
i'm already change all caps, c16, c17, Q3 E, IC12 and QM3...
when i test to my car CEL lights goes off after 2 seconds but car won't start... when i checked, the main relay just sound for 1 click and no 2nd clicks...it's coz fuel pump not primes..when i change another main relay it's just same symptom....
any advise bro? tq...

---------- Post added at 12:14 PM ---------- 6 hour anti-bump limit - Previous post was at 10:54 AM ----------

Oppss...sorry not IC12 but IC17 (TA8903SN)....it's P27 T00 ecu...
TQ in advance....

Pictures pls... And recheck your qm3.... Did you damage the trace when replacing it?

 

[_firecracker]

Yup..... 2SC2240 =C2240

I just got the part in, however the picture you showed me of Q37 is not from my ECU or even one with the same board. Q37 is not a 2240 transistor. Did you mean Q38 on the 1980 board?

I am doubt its the components issue. Try clean up your board with high quality thinner, remove ALL dirty residual that reside in between the pins.

---------- Post added at 06:28 PM ---------- 6 hour anti-bump limit - Previous post was at 06:19 PM ----------

If problem still exist, mean that you have disconnection in you IAC circuitry due to corrosion. You need to trace it with great patient.

I will check and retouch some solder joints

 

[_firecracker]

I am doubt its the components issue. Try clean up your board with high quality thinner, remove ALL dirty residual that reside in between the pins.

---------- Post added at 06:28 PM ---------- 6 hour anti-bump limit - Previous post was at 06:19 PM ----------

If problem still exist, mean that you have disconnection in you IAC circuitry due to corrosion. You need to trace it with great patient.

removing the corrosion fixed it, thank you.

 

[fazrul80]

Hi Bro E-tech...
Sorry for late reply .. I recently returned from a course ..
I've checked all the trace with a multimeter. all relevant trace has continuity... i dunno what's the problem..
this my p27 ecu...

 

[E-Tech]

Check here... Especially the big cap...
Remove cap and check below copper trace..

 

[fazrul80]

TQ Bro E-Tech...
I will check Q3 .. I dun think the big cap because I replaced all the caps first.. then I tried it on the car but CEL light will goes off around 5-15 minutes .. fuel pump prime normally after CEL light goes off ... I use the car a few days and after that I just replace components Q3, IC17 & QM3. fuel pump is not working after I changed three of these components...

 

[fcwee]

Dear All,

I have ECU P30 engine light on, swap ECU tested ok, faulty ECU all the caps,QM3,IC17 changed still engine light on can't start engine pls any advice? Thanks

Rgds
fcwee

 

[E-Tech]

Dear All,

I have ECU P30 engine light on, swap ECU tested ok, faulty ECU all the caps,QM3,IC17 changed still engine light on can't start engine pls any advice? Thanks

Rgds
fcwee

My guess.... Cap leak badly and you now hv broken connections somewhere...

 

[fcwee]

My guess.... Cap leak badly and you now hv broken connections somewhere...

Dear E-Tech,

Below is my ECU P30 Pictures, we recheck the PCB trace look like good condition, Beside broken connection have which component can cause the engine light on can't start.

(All the caps,QM3,IC17 Changed)

Rgds
fcwee