No start!!!
Thread Starter
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
Swapped CPS already with an international black... IPR pressure would still come up though. Pulled a code U1262, communication bus failure. I'm gonna have to wait till morning to dig in further.
Thread Starter
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
So far fuses all check good with test light... Swapped #302 relay with no change. IDM toast? ECM? Pulled dp tuner off with no change
Thread Starter
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
Hooked up AE with a better laptop, not producing the u1262 code now. Getting a p1280 ICP sensor circuit low
To add, ICP sensor is full of oil...think that's gonna be next, needs replaced regardless.
To add, ICP sensor is full of oil...think that's gonna be next, needs replaced regardless.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Going off memory here (we're all gunna die now):
To wake the beast up -
ICP 500 PSI min
10 volts min (battery) while cranking (book says 10.5, but I've seen trucks start with less)
0.6 ms Fuel Injector Pulse Width before cranking (this says IDM/PCM are sync'd), 1ms FIPW min (6ms max) after that.
100 RPM while cranking
IPR will likely start at 14% before cranking, then climb during the crank.
I think I overlooked something... maybe I'd better check the AE class.
To wake the beast up -
ICP 500 PSI min
10 volts min (battery) while cranking (book says 10.5, but I've seen trucks start with less)
0.6 ms Fuel Injector Pulse Width before cranking (this says IDM/PCM are sync'd), 1ms FIPW min (6ms max) after that.
100 RPM while cranking
IPR will likely start at 14% before cranking, then climb during the crank.
I think I overlooked something... maybe I'd better check the AE class.
Thread Starter
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
ICP reads 0psi
ICP voltage .10
ICP duty cycle 14.84%
FIPW 0.00
Vehicle power voltage 12.4
Engine rpm 0.00
No real changes when cranking except the voltage drops to 11.1 and ICP voltage goes up to 0.11-0.12
ICP voltage .10
ICP duty cycle 14.84%
FIPW 0.00
Vehicle power voltage 12.4
Engine rpm 0.00
No real changes when cranking except the voltage drops to 11.1 and ICP voltage goes up to 0.11-0.12
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Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
This one right here shoots you in the foot. You really want to make sure that all connections are good, as well as fuses. If you don't get 0.6 ms FIPW KOEO, you're done. This is a bad PCM, IDM, or a connection somewhere. The ROM code is expected when the chip is in, but not with the chip out. Does it still have this error after resetting codes?
Sorry, bud... this doesn't look simple or cheap.
Sorry, bud... this doesn't look simple or cheap.
Thread Starter
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
code remains after clearing DTC's.
New ICP sensor is on its way, its totally saturated with oil. im praying for a bad connection somewhere!
Weird though how it started just fine, ran for 10 secs or so and then just died.
New ICP sensor is on its way, its totally saturated with oil. im praying for a bad connection somewhere!
Weird though how it started just fine, ran for 10 secs or so and then just died.
Thread Starter
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
If the sensor is toast but not shorted or open, it's possible the PCM may not realize the sensor is bad and still trust the reading rather than using inferred values. If that's the case, the PCM will never send a fuel delivery command signal to the IDM. Granted it isn't likely, but it's possible. If you can log ICP, IPR duty cycle, injector pulse width, RPM and voltage while cranking it might shed some light on it. Were there any codes present? You replaced the IPR with a known good part, right?
Thread Starter
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
If it's pcm failure, do I need to find a PMT1 or does it matter with having the dp chip?
