From the start, or NO START rather.
Sorry, but last night, at around 9 or so, I WAS INVOLVED WITH A SIMILAR EVENT AS YOU. Let's go back to the beginning. A 2001 3.3l was towed in, no start. The PCM WAS BURNED. DON'T MIND MY CAP'S KEY, IT IS MY POOR ONE-HANDED TYPING ON A KEYBOARD THAT SOMETIMES WORKS, AND SOMETIMES DOES NOT. BUT IT WAS ONLY 9.99. WHEN YOU SAY BURNED, WHERE? Inside PCM Correct? I believe its about the key crank, and run circuit diferrences.
So what would cook a PCM. Since all it does is ground different signals, and also supply 8, and 5 volts to other sensors. It even controls it's own destiny by sort of turning itself on, if a couple of things are correct, do you follow me?
5 volts, shorting to ground would mean some of these sensors would not have voltage, 8volts same thing, as with 12 volts? I'm sure one of them is grounding before their job, intermittantly. If your coil pack has 12 volts in only the crank position, and it does not start, should not have 12 volts after not starting, yet in key run position. The PCM also has field control, right? What if it full fielded it's own alternator, no problem, correct, of course the PCM is protected from that correct? The PCM has no protection from a full field, outside of its own control. Internally of course it will not want to burn up, so there is a safeguard for that, but lets say that it failed. 5 volts, 8 volts to ground also would be bad, a 2000 PCM will never start a 2001. Your having a starting systen problem, you can't test any run condition. Not running. So if this PCM will operate another van, why not start from scratch once again.
In crank position(of ignition) you have starter relay, you have cam, crank, you have fuel. Engines ok also.
You have continuity from coil to PCM. Also from injectors to PCM. Than why no coil production(driver), why no injector driver after cranking for a second. Only two reasons, 1. Wrong PCM, or 2. No cam, crank signal. Fuel, wiring, engine comp. How to tell which? I, ve read your first question. I'll read it again.
I take it you have compression or it would not have alreasdy left, so why did your first PCM fail, The fuel is good correct, all you mentioned are ok? And why isn't the shutdown relay shutting off in the key run position. In the run position. With a no run vehicle. I will ask a couple questions.
At run, key run position, there should be no 12 volts at coil. Only crank position.
Un less it is running. And the Cam, crank signal decides that. And Fuel. And Timing, And compression, and PCM. So if your shutdown relay is staying on in the key run position, but its not running, the wire is grounding. Because the PCM is not going to start this 3.3L without it knowing that the cam, crank is working.
I'm sure if your circuitry(wiring) is correct, the problem is that the PCM it originally came in with(towed) was full fielding the alternator, or 8, 5, volts to ground and thus the cooking? And so you put the same part number in and again its cooked? I'm sure this PCM runs a good 3.3L engine, harness, and minivan. And a 2001 also it is working with? Intermittant shorts and opens are the most exciting thing, and frustrating. If this PCM runs another 2001 I'm sure everything you have told me is correct. I feel bad, about your problem. It is so different, a 2001 or 2000.
I Cannot help, if I cannot see, hear, or feel. So please let me know, and if worst comes to worst, we will just jump this new module called a doublestart override(in PCM) ok. Whether the van will be ok as far as charging, well we will see.
I would ask one favor, were any fuses burnt.
I will catch, or hear from you on Monday, ok. Or tomorrow. I now have something in my driveway.
OK sir, you have been so kind to answer me. Thanks. I'm not crazy. Just love electrical shorts, opens, and especially hydraulics. Bye til later.
Can't tell anything with no start, do you still have the vehicle that worked ok with this PCM handy? Thank-you sir.
Friday, November 20th, 2009 AT 8:03 PM