No start!!!
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
no change after reconnecting grounds... p0605 displayed after KOEO test. doesn not display when initial DTC's are pulled.
Guess I better start looking for a PCM? does it matter what code PCM I get? Do I need to go back to PMT1?
Guess I better start looking for a PCM? does it matter what code PCM I get? Do I need to go back to PMT1?
Lead Driver
Joined: Jun 2004
Posts: 6,362
Likes: 593
From: Amarillo, TEXAS!
In case you didn't refresh the page after I posted above:
There's a chip involved? Has it been connected this whole time? If it has, remove it and see if anything changes. Chips can cause some really strange things to happen.
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
dp tuner... i disconnected it first thing this morning and still no start, then plugged it back in. i haven't tried to read codes with it disconnected... not sure that it matters, but jody also reflashed my pcm to run single shots with no chip
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
pulled chip, get no codes on DTC scan (same as with chip in), still getting p0605 when running KOEO test. Injector buzz test is good, wouldn't that confirm IDM is communicating? Chip out, still seeing 0.00 FIPW before cranking.
Is the PCM looking like the culprit here? I'm baffled as to why it would just give up ghost all the sudden, running fine, started fine, then toast!
Edit: ICP voltage is up to 0.22 after swapping sensor
Is the PCM looking like the culprit here? I'm baffled as to why it would just give up ghost all the sudden, running fine, started fine, then toast!
Edit: ICP voltage is up to 0.22 after swapping sensor
Lead Driver
Joined: Jun 2004
Posts: 6,362
Likes: 593
From: Amarillo, TEXAS!
.22 volts on the ICP sensor is still only about 100 psi or so. Can you watch IPR duty cycle while cranking also? After I eat, I'll go out and double check my injector pulse width KOEO. I think it should come up to a standby level of 0.5 before cranking. I don't want to get your hopes up though. For P0605, the book doesn't even have any diagnostic steps. It just says if P0605 is present, replace the PCM.
Lead Driver
Joined: Jun 2004
Posts: 6,362
Likes: 593
From: Amarillo, TEXAS!
I just checked my truck, and I have 0.0 pulse width until I start cranking also. Can you watch RPM with the scan tool while cranking and make sure it's getting a reading? If the PCM doesn't see at least 100 RPM while cranking, it won't command the IPR duty cycle above 14%. That could explain the low ICP reading. It still wouldn't explain the P0605, though.
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
I get no reading on RPM while cranking, no duty cycle increase either. only thing that fluctuates is the ICP voltage jumps a little, and obviously system voltage goes down... maybe I should try ANOTHER CPS? the one I swapped out was a working "black" CPS I had bought about 2 years ago, had it in the truck for about 3 weeks, swapped it back out for my old gray one when I had IPR failure on the side of the road. The black one (new) has been sitting in my glove box since.
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Hotshot
Joined: Jan 2011
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From: Puget Sound
I'm back - rough day.
Without that sync signal between the PCM and IDM, we're done. This is just power on, nothing happening. Wondering about other parts is like saying "Maybe if we crank the motor or get a CPS signal, the fuel pump will turn on for the first 20 seconds." If it ain't there right off the bat, it ain't gunna get there.
While we can't rule out the IDM, the PCM is highly suspect - I doubt the IPR or ICP is doing what the PCM "alleges" they are doing. With a bad PCM, anything and everything is suspected as a lie.
Without that sync signal between the PCM and IDM, we're done. This is just power on, nothing happening. Wondering about other parts is like saying "Maybe if we crank the motor or get a CPS signal, the fuel pump will turn on for the first 20 seconds." If it ain't there right off the bat, it ain't gunna get there.
While we can't rule out the IDM, the PCM is highly suspect - I doubt the IPR or ICP is doing what the PCM "alleges" they are doing. With a bad PCM, anything and everything is suspected as a lie.
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
What would cause PCM to give up ghost like that? Started fine, idled for 10 seconds and then flatlined. Would the buzz test rule out IDM? Wouldn't the injectors not buzz if not commanded by the IDM?
Lead Driver
Joined: Jun 2004
Posts: 6,362
Likes: 593
From: Amarillo, TEXAS!
I don't know if there is any good explanation. When it comes right down to it, the PCM is just a collection of semiconductors, and they all have a mean time before failure (MTBF). Sometimes semiconductors seem to last forever, and other times they fail early. I hate to tell you to just go ahead and replace it, but with the P0605 code, that's the only solution the book even offers.
Thread Starter
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
I don't know if there is any good explanation. When it comes right down to it, the PCM is just a collection of semiconductors, and they all have a mean time before failure (MTBF). Sometimes semiconductors seem to last forever, and other times they fail early. I hate to tell you to just go ahead and replace it, but with the P0605 code, that's the only solution the book even offers.
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Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
thought I'd ask here, starting my own research too... found a donor pcm its for an auto trans but is a DPC-452 with UKN1 code. is this compatible with my truck that should be using a DPC-422? Not trying to drive it, just diagnose the no start. Thanks again everyone!!!
Edit: Just pulled my PCM and I have a VDH5 which is on a DPC-462... hope the -452 will work for diagnosing.
Edit: Just pulled my PCM and I have a VDH5 which is on a DPC-462... hope the -452 will work for diagnosing.
