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PO262 code

Food for thought, if the rear is working, the exact same voltage and resistance should be on the other circuit for the front coming from ecu. If I remember correctly, the front and rear are separated at the ecu...gonna view diagram now
 
Shovels4ever said:
Food for thought, if the rear is working, the exact same voltage and resistance should be on the other circuit for the front coming from ecu. If I remember correctly, the front and rear are separated at the ecu...gonna view diagram now
Click to expand...
correct and everything is normal until its not, there is voltage at the injector when it fails nothing on the trigger
 
Copy, thanks. I'm catching up..
So, trigger works in beginning, then just quits? Correct?

So, if you have correct voltage coming from the relay, the only two other things on that circuit are the injectors and fuel pump.

Apparently, the fuse is OK to pump cuz it is working.

So, if proper voltage is coming from relay, that must mean ecu is fine.

Any possibility the relay is faulty? Works when cold, but, fails when hot?

Are you losing spark on that cylinder at the same time?

Possibility where injector one and injector 2 junction would also be an area of interest.



Have you removed relay and bench tested it? 10 times off and on?

If the circuit is working at first, you would think the issue is between relay, injector, and pump circuit.

Also, when the trigger stops, does it stop at relay or where do you lose current specifically.
 
CR. Chancho said:
correct and everything is normal until its not, there is voltage at the injector when it fails nothing on the tr
Click to expand...

Thanks for you input thus far much apricated, I just came back from my garage here is the latest, hooked up multiple meters, 2 on the front injector, one on the battery, one on the 86 terminal of the relay and one on the ECM connector at the w/y wire, also hooked up my FuelPak 4 for more info, all voltages good at start up 2min into running voltage went up to 14.6 injector shut down.
Did a check on the stator output within range, left it unhooked and restarted ran for about a min before starting to stumble on the front cyl. voltage was 12.6 at the battery and the rest were 11.9 throughout the system, at both injector wires voltage was 11.9.
I was monitoring the FuelPak readouts and everything was good until it started to stumble then the duty cycle was fluctuating on the front injector then the front injector shut down.
System relay is ok as well.
Major frustration!
 
I hear ya, these problems are a pain! Slow, detailed, meticulous testing is key to solution.


Is 86 a good ground? Have you checked to make sure?

Check resistance on BE/GY 30 from ecm to relay and from ecm fuse to ecm. See if that wire is shorting to ground. Also, capture live voltage on that wire while running up until the voltage goes crazy. Just make sure you don't feed current to ecu by mistake.

Somewhere in between the current is going high just like the code is suggesting. I assume it's shorting to ground as it warms up.

I believe the coil is on same circuit, test those wires as well. The coil could be shorting as it gets warm due to faulty lamination inside coil. I don't believe there is a fly back diode on that circuit to protect injectors. Oftentimes, they forget diode and figure relay will protect circuit. Not true...

I'm wondering if coil is sending voltage spike up y/g wire back up to relay and injector
 
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Shovels4ever said:
I hear ya, these problems are a pain! Slow, detailed, meticulous testing is key to solution.


Is 86 a good ground? Have you checked to make sure?

Check resistance on BE/GY 30 from ecm to relay and from ecm fuse to ecm. See if that wire is shorting to ground. Also, capture live voltage on that wire while running up until the voltage goes crazy. Just make sure you don't feed current to ecu by mistake.

Somewhere in between the current is going high just like the code is suggesting. I assume it's shorting to ground as it warms up.

I believe the coil is on same circuit, test those wires as well. The coil could be shorting as it gets warm due to faulty lamination inside coil. I don't believe there is a fly back diode on that circuit to protect injectors. Oftentimes, they forget diode and figure relay will protect circuit. Not true...
Click to expand...
Thanks again, will get to all that on Tuesday and will get back to you with results.
 
Yes sir, sounds good!

The solution to your problem is between pg 4-97 to 4-99 in the manual posted above.

Follow those procedures and the problem should be clear.
 
Shovels4ever said:
Yes sir, sounds good!

The solution to your problem is between pg 4-97 to 4-99 in the manual posted above.

Follow those procedures and the problem should be clear.
Click to expand...
Well, got back at it today, turned out to be the fuel pump after it was running for a bit it would send enough of a short to interfere with the injector but not blow a fuse, when it started to screw up I had continuity across terminal 10 and 21, unplug the pump no continuity...go figure!
 
Yes sir, same happened to mine except mine quit and was easier to detect.

Basically, the pump was gummed up from Ethanol. I almost never use ethanol, but, was on a long ride and could not find non ethanol. Then let the bike sit for three weeks. Created a real mess. I had to replace O'rings in pet cock and remove pump to clean. I also found a pin hole in the plastic fuel line.

Glad ya found it Boss!
 
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