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Discussion Starter #1
Hello.
i am really don't know what going on.

Honda odyssey 2012 EXL 145k.

Received check engine - p0305, p0306 (Misfire) - 3 times (few days light, few days don't light)
Trying to injector cleaner process by using OTC 7448 device.

1) removed fuel pump relay
2) start engine - engine stopped when gas is over
3) removed quick connection on fuel pipe
4) connected pipe from OTC 7448 device
5) trying to start engine - nothing ...
crank crank crank ... battery go down ... nothing
---------------
next day
1) returned fuel pipe connection
2) incerted back fuel pump relay
3) trying to start engine - nothing ..
4) removed spark plugs - looked like wet
5) cleaned and warmed them up
6) trying to start engine - nothing ..
7) removed spark plug from cylinder number 5 - looks like dry
8) trying to start engine - nothing ..
9) removed spark plug from cylinder number 4 - looks like dry
10) removed quick connection on fuel pipe - nice pressure

I think problem in only one - why car did not start on injector cleaner fuel ?

Help me plz, i need this car for Friday ...
Thank you !
 

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Either spark or fuel is missing.

Wet spark plug indicates fuel.

Remove a spark plug and test it for spark when you crank the engine.
 

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Discussion Starter #3
no spark.
no fuel.
something blocking all.
1) what can be blocked when gas over status? (because car not start after gas over, when was removed fuel pump relay).
2) can gas from removed fuel pipe connection flooded crankshaft position sensor (looks like sensor location is under this place).
 

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Discussion Starter #4
sorry for mistake - checked sparks - spark plug from cylinder number 4 working fine.
 

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Discussion Starter #5
checked crankshaft position sensor. connector was flooded by mix of oil, gaz, injector cleaner.
cleaned all - nothing...
 

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Discussion Starter #8
Car start on starting fluid - worked few seconds and take off.
I cheked all relay (main 1, sub main 1, fuel) - all are ok.
What next ?
 

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Test for 12V at the injectors with ignition ON.
 

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Discussion Starter #10
Test for 12V at the injectors with ignition ON.
I know, but if it will be ok, that will be mean problem with ECU ?
Is it real in one moment recive so strong demage, after changing fuel hose to hose from injector cleaner tool ?

Maybe it is some air in fuel trail ?
 

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Discussion Starter #12
since you removed the relay, I would start there, along with fuses.

did you pull it with the ignition on?
i don't remember that - but car was started fine after that and worked up to the gas was over.

i did not remove negative cable from battery.

i read a lot of stories when car not start after the gas was over (new gas was added, but not start). but all of them had happy end without big work.
 

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I know, but if it will be ok, that will be mean problem with ECU ?
If the injectors have power, either they are not getting a trigger signal from the ECU or there is no fuel in the rail.

I'm not very familiar with the 2012 's ECU. Maybe there is some logical reason why it has decided to not fire the injectors? Immobilizer? Crank or cam sensor failure?

Generally, ECU failure is rare. It's a convenient suspect, but I would look elsewhere first.

Is it possible the present no-start is an extension of the engine misfire codes you had before doing the fuel system cleaning? Have you scanned for new codes?
 

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Discussion Starter #14
If the injectors have power, either they are not getting a trigger signal from the ECU or there is no fuel in the rail.

I'm not very familiar with the 2012 's ECU. Maybe there is some logical reason why it has decided to not fire the injectors? Immobilizer? Crank or cam sensor failure?

Generally, ECU failure is rare. It's a convenient suspect, but I would look elsewhere first.

Is it possible the present no-start is an extension of the engine misfire codes you had before doing the fuel system cleaning? Have you scanned for new codes?
1) immobilizer is ok because car was start on starting fluid and there is no green key light
2) crank sensor - ok - same reason - engine started - spark good
3) cam sensor - i don't find any info about no start if there is issue with this sensor

ECU failure really rare.
I'm going now to remove intake for check voltage and ground impulse.

About misfire.
Before started on starting fluid scanner find only few abs error.
But after it started, we have p0304, p0305, p0306, p0300.
But as you remember car was started fine when i had p0305 and p0306.
 

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Discussion Starter #15
also, i had vsa + cel (p0305 p0306).
a lot of post about vtec solenoid and bad oil.
vtec was cleaned and oil was changed month ago, when i changed valves in cylinder number 4.
 

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im going to say its a pcm issue.
they arent rare, have seen multiple posts on them going bad and the multiple misfires and random other errors are usually the symptoms.
 

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Discussion Starter #17
Results:

Situation 1: without cranking
-----------------------------

1) ignition OFF - voltage 0v

2) ignition ON - voltage 12v (+ injector, - body)
but when i connect + injector and - injector there is voltage too !!!
injector 6 - 0.29v
injector 5 - 0.07v
injector 4 - 0.06v

3) ignition OFF - voltage 0v


Situation 2: with cranking
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1) ignition OFF - voltage 0v

2) ignition ON - voltage 12v (+ injector, - body)
but when i connect + injector and - injector there is voltage too !!!
injector 6 - 0.29v
injector 5 - 0.07v
injector 4 - 0.06v

3) cranking - voltage range 1-1.5v (+ injector, - injector)

4) ignition OFF
voltage 12v (+ injector, - body)
+ injector, - injector there is voltage too !!!
injector 6 - 0.29v
injector 5 - 0.07v
injector 4 - 0.06v

5) car closed - voltage same as in part 4)

Battery going down very quickly.
 

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All of those negative side measurements would be considered "0V" in the car voltage measurement world. Nothing out of the ordinary there.

-Charlie
 

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Discussion Starter #19
All of those negative side measurements would be considered "0V" in the car voltage measurement world. Nothing out of the ordinary there.

-Charlie
Ok.
1) Does it mean that ecu (pcm) don't send impulses to the injectors ?
Voltage changes during cranking - but its so small.

2) Voltage 12v after ignition OFF not normal. Is it a problem with ecu (pcm) ?
 
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