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Hacking up Honda's ECU
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johnny_loo
PostPosted: Sat Sep 15, 2012 12:46 pm 
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Posts: 79
Location: Japan
dear all guru, i got a P72. i have change all new capacitor.
than i plugged in Moates ECU tester.
what i found is ICM, IVAC, FPR, VTEC are ON. left the 4 injector dead... and NO MIL light.(Check engine is off, in the pic is dimm on, but actually is off. if check light on, that LED will brighter than IVAC or FPR)
ICM is blink slow when low RPM. what i know is everything work well on this ECU but injector control IC are bad.

so where should i begin to check or repair??


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rob91da
PostPosted: Sat Sep 15, 2012 2:51 pm 
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Joined: Tue Sep 30, 2008 10:29 pm
Posts: 3
Last time I lost one, I had a bad transistor on the board. It's been a while, but I just traced the output pin from the Injector (3 in my case) through the board traces and found the bad transistor, pulled it and tested bad, threw in a new one and I was good to go.
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johnny_loo
PostPosted: Sat Sep 15, 2012 10:02 pm 
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Location: Japan
rob91da wrote:
Last time I lost one, I had a bad transistor on the board. It's been a while, but I just traced the output pin from the Injector (3 in my case) through the board traces and found the bad transistor, pulled it and tested bad, threw in a new one and I was good to go.


i got 3 injector not working? or just 1?
i got 4 of it... suspect main controller. M7U016-005
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johnny_loo
PostPosted: Sat Sep 15, 2012 10:55 pm 
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Posts: 79
Location: Japan
ok... i have change RM5, QM1 QM2, MSM7U.... STILL THE SAME!!!
now left the Q9 Q10 Q11 Q12... but i dun think so 4 of it spoil at same time...

some 1 help? idea?

My Board is 02D01550-1503
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e-tech
PostPosted: Sun Sep 16, 2012 4:57 am 
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Joined: Thu Sep 27, 2007 10:14 am
Posts: 193
Bro....
Replace Qm3 first is all 4 are not firing...
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johnny_loo
PostPosted: Sun Sep 16, 2012 8:55 am 
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Location: Japan
e-tech wrote:
Bro....
Replace Qm3 first is all 4 are not firing...

ok thanks, try it later.
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rob91da
PostPosted: Sun Sep 16, 2012 9:28 am 
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Sorry, misread it, thought you meant the #4 was dead, didn't pay attention.
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johnny_loo
PostPosted: Sun Sep 16, 2012 10:23 am 
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Posts: 79
Location: Japan
johnny_loo wrote:
e-tech wrote:
Bro....
Replace Qm3 first is all 4 are not firing...

ok thanks, try it later.


bro, same result. take out from other board QM3
so now i have change QM1 QM2 QM3, MSM7U, Q9, Q10, Q11, Q12, RM5, even main Processor M66207...... i have totally out of idea how to fix it...
i read the connection start from injector PIN A1 A2 A3 A5... all link to component i mention above... until end is M66207...
OMFG... is it the 5V supply LM2940 problem??
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johnny_loo
PostPosted: Sun Sep 16, 2012 12:00 pm 
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Location: Japan
ok... in the end... P72 ALIVE!!!! haha
i solve it with multimeter....
the Q9 Q10 Q11 Q12 have no 5V supply... so.. wat u think? fastest way, jump from LM2940T...
TADA~ injector LED are insanely Bright!!!
i jump it becos there have no physical dmg and circuit break...
i put under the light and find the breakage for a few hour... no break, so jump....
now is on ECU tester and VTEC on, leave it run for over night.
i'll update 2morrow morning see what happen on it... hehe... :D :D :D :D
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e-tech
PostPosted: Mon Sep 17, 2012 10:51 am 
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Bro
Your L2 connection ok or not?
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johnny_loo
PostPosted: Thu Sep 20, 2012 1:30 pm 
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Posts: 79
Location: Japan
e-tech wrote:
Bro
Your L2 connection ok or not?

well, i have solve the problem, i found the board linkage from top surface to bottom surface solder are bad contact. there is 15omh... than supply current to Q9 Q10 Q11 Q12 are low. after i resolder it, the board are working great. that linkage is right beside RM5. tiny dot, wasted my whole day....
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