here is the deal I backed over a couple chunks of wood then 15-30 seconds later it died.
Here is what I have going on.
NO spark, I have at most 3.25 volts at coil key on
Fuel pump does not shut off when the key is just on, yes it does shut off with key off, but ussually fuel pumps run a couple seconds then shut off unless engine is running. Fuel rail has plenty of pressure and fuel.
Tried to scan any codes and I got a "link error" on our code reader, I have read the codes on this van before with this meter. Both power and ground are fine at plug on van.
So, far I have checked cam and crank sensor, dropped fuel tank checked out fuel pump, I did switch PCM with another USED one with same results.
Any thoughts from anyone?
stev
06-07-2009, 11:14 PM
Have you crawled under the van to look over all the wiring? Possibly a wood splinter severed or nicked a wire and grounded it out.
siev2000
06-08-2009, 07:48 PM
Been under it over it the whole deal, there is only one harness underthere that goes along frame rail. I have checked all the sensors on everything under there, nothing. I am still leaning towards PCM or BCM troubles. Wish there was a way to check them without spending hundreds.
landyacht318
06-08-2009, 08:01 PM
You don't state whether it is cranking or not.
Since it is pretty low and might have been affected by any tumbling wood, how about checking the Neutral safety switch on the tranny and the wires leading to it.
Do the reverse lights work?
siev2000
06-08-2009, 08:41 PM
yes its cranking thats only way i have to check spark, and no sure on lights, but where is this neutral switch? I would think I could not crank if it was damaged, but not sure,
like I say I am thinking of trying a new PCM, but wow the price for a gamble
thanks
alloro
06-08-2009, 08:55 PM
Have you checked each and every fuse under the dash and under the hood to make sure that power is getting through them? Considering that this happened when the van took a jolt, along with you getting the same results from a second PCM, I'd have to say it is not a PCM problem.
stev
06-08-2009, 09:28 PM
If the van took a jolt or bounce, check the relays.
That every so critical and fussy ASD relay can be a pain at times.
97B2500CCV
06-08-2009, 10:00 PM
97 vans do not have the BCM. The neutral safety switch is working since the starter motor turns the engine, it is located on the driver side above the left rear corner of the trans fluid pan.
Is there a dent in the fuel tank or does it looked like it was hit by the wood?
Try switching the ASD relay with the starter or AC relay.
siev2000
06-09-2009, 07:06 PM
checked fuses 3 times, switched relays, and had the gas tank down fuel pump out to look it over,
I was wondering about the BCM and location as I not seen any mention in the book of it.
The PCM switch was done with one from salavge yard, and it was suppose to be from same everything van, but I now noticed different part numbers.
I also have read alot that PCM must be programed to exact vin numbers to work properly
thanks
97B2500CCV
06-09-2009, 08:25 PM
No BCM for the 97 vans, you will not find it. BCM's were introduced latter, maybe in 98 don't know for sure but the 97 vans do not have one at all.
The PCM computer numbers must match up to what your's had. They do not need the VIN number programed in, at least not the one's up through 97 do not.
3.25 volts at the ignition coil and swapping the relay out means there is a problem with that circuit. The fuel pump constantly running when the key is on would cause me to suspect that the PCM has gone bad.
One thing to try before another PCM is to open the PDC and remove the ASD relay and using a volt ohm meter check to see if you have a slot where the relay goes that has a constant 12 volts even with the key turned off. The C3 pin slot should have a constant 12 volts. If you do not have any of the pin slots that has 12 volts then open the PDC after you unhook the battery and trace the red/white wire back to fuse 17/18 which is a 20 amp maxi fuse and fix it.
If you do have constant 12 volt power then start checking the Pin C5 Dark Green/Orange wire and see where it is shorted out at since on that wire you only read 3.25 volts which is not enough power. One place to look would be near the O2 Sensors in front of and behind the catalytic converter. That dark green/orange wire powers the ignition coil, O2 Sensors, and the injectors.
