DIY Honda ECU Repairs- P30 P08 P27

[levin818]

IC17 will get fail when the leaking electrolite from the cap has folded its pin and cause unnecessary electrical conduction.

 

[_firecracker]

So while attempting to repair my ECU I broke the solder pad off the bottom side of negative side of the main board at C14 (the main 35v 220uf cap). The top solder pad of the ECU is still intact just the bottom pulled off.

I realize it seems to be a main ground but running a lead from the capacitor negative to ECU negative does not repair the ECU. I just get solid CEL, no fuel prime or anything, the ECU primed fuel before this.

The question is, where does this solder pad go to? where should I just a wire from the negative side of cap to the ECU?

 

[E-Tech]

So while attempting to repair my ECU I broke the solder pad off the bottom side of negative side of the main board at C14 (the main 35v 220uf cap). The top solder pad of the ECU is still intact just the bottom pulled off.

I realize it seems to be a main ground but running a lead from the capacitor negative to ECU negative does not repair the ECU. I just get solid CEL, no fuel prime or anything, the ECU primed fuel before this.

The question is, where does this solder pad go to? where should I just a wire from the negative side of cap to the ECU?

Which ecu? Wanna show me a pix?

 

[Extreme_events]

Hi
I have a P08 that wont start. No codes,
Cel comes on then goes off as usual and main relay clicks and pump primes as I have a fuel pressure guage. Engine cranks but does not start. Had to borrow a P30 chipped. Any suggestions? Board looks good. Pic attached. Any help will be appreciated ! Thanks

 

[Extreme_events]

UPDATE: changed Q25 and Q26. Car started but idles a bit low and rough. Will do more checks tomorrow. Any ideas in the interim?

 

[E-Tech]

Hi
I have a P08 that wont start. No codes,
Cel comes on then goes off as usual and main relay clicks and pump primes as I have a fuel pressure guage. Engine cranks but does not start. Had to borrow a P30 chipped. Any suggestions? Board looks good. Pic attached. Any help will be appreciated ! Thanks

Hi
1- picture not clear enough to judge ok or not.
2- got spark at plug cable?
3- do you actually hear fuel pump prime?

 

[Extreme_events]

Hi
1- picture not clear enough to judge ok or not.
2- got spark at plug cable?
3- do you actually hear fuel pump prime?

Ok.. Car started checked for Cel and got Cel 3 which is Map sensor. Switched Ecu and no cel on other ECU. Pics attached. Thanks E tech

 

[Extreme_events]

Ok.. Car started checked for Cel and got Cel 3 which is Map sensor. Switched Ecu and no cel on other ECU. Pics attached. Thanks E tech

Here is a pic of the other half of the Ecu

 

[Extreme_events]

Here is a pic of the other half of the Ecu

UPDATE: Was getting Cel 3 and it started to give trouble on the working ECU as well. Checked back the wiring and changed all three pins D17, D19 and D21. Problem seems to be fixed. Thanks !

 

[coOLR3xz]

I have this problem...
My cel on when my car cruising 80kmh at highway, then I cant remember my engine go go off or not, No throttle response but after few seconds the cel off and my engine continue running as normal.
Another problem the engine will rev itself continuously in neutral gear. But after cleaning throttle no more revving itself.
Reading this remind me of ecu problem. I will try to replace the cap but I cant understand what is ic17 that mentioned in previous post? Need to replace that too?
My ecu is p30 auto.

 

[E-Tech]

I have this problem...
My cel on when my car cruising 80kmh at highway, then I cant remember my engine go go off or not, No throttle response but after few seconds the cel off and my engine continue running as normal.
Another problem the engine will rev itself continuously in neutral gear. But after cleaning throttle no more revving itself.
Reading this remind me of ecu problem. I will try to replace the cap but I cant understand what is ic17 that mentioned in previous post? Need to replace that too?
My ecu is p30 auto.

Hi...
Do the caps first.
Ic 17 is cannot cel off and cannot start.

 

[Extreme_events]

I have this problem...
My cel on when my car cruising 80kmh at highway, then I cant remember my engine go go off or not, No throttle response but after few seconds the cel off and my engine continue running as normal.
Another problem the engine will rev itself continuously in neutral gear. But after cleaning throttle no more revving itself.
Reading this remind me of ecu problem. I will try to replace the cap but I cant understand what is ic17 that mentioned in previous post? Need to replace that too?
My ecu is p30 auto.

Hi CoOLR3xz,
I have had a similar problem before. I checked the codes on the ECU then checked the wiring for the sensor. At the time the wiring at the Map Sensor and TPS was brittle because of age. Replaced wiring from a old harness and problem was fixed. Try shaking the wires at those sensors first with the car started to see if you can pinpoint if that is the cause of your intermittent check light

 

[coOLR3xz]

Hi...
Do the caps first.
Ic 17 is cannot cel off and cannot start.

May I know what type of cap shud I get?
All p30 will have the same cap?

 

[coOLR3xz]

Hi I cant find 10v caps at jalan pasar
They say only got 16v caps, is it ok?

 

[E-Tech]

Hi I cant find 10v caps at jalan pasar
They say only got 16v caps, is it ok?

U mean 47uf 16v, 100uf 16v & 220uf 16v?
Yup... It's ok.