Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.Roy
does the check engine light come on when you turn the key on???
ok, then you have either no power to the ecm or the ecm is no good. let me get a diagram of the powers for you to check
no, the powers to the ecm. it is the blue connector.
I attached the picture of the blue connector and each pin. check for power at the listed pins for battery power and ignition power.
as I stated before, there is likely no power going to it to make it work. you can put in as many as you want but without power it will not work. thats why we are going to diag it once repair once without throwing anymore parts at it
depends on what part is not powered.
did you verify powers and grounds with what I sent you??
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yes, just check the powers and grounds listed for power.
can you send me a picture of the ecm or the number for the ecm???
they are together looking
have you checked all your fuses for power on both sides with the key on???
ok, lets back up
check the ignition switch for power out on the wires with run marked
lets back up and check outputs from the ignition switch check the ones that are marked run
without the check engine light on there is either a power issue to the ecm or the ecm itself.
since you said the fuses are all good. check the connectors for battery voltage at the ecm and tell me what colors have power. look at orange and red wires
cannot find them still looking. I see the ecm listed but not connector diagrams. the age of it is the issue. some of them they deleted.
did you check for power to the ecm as I asked???
looking through all kinds of connectors
yes, the key needs to be on
there should be at least 2 with the key off that are hot
one thing. they do not list a non turbo for a 97. can you verify the year of this???
it is a P series step van???
ok, very odd with this one
you have battery and key on power. that leaves only the ecm.
this is a programmable unit since it is obd2.
I would get a reman unit and have it flashed to your vin number. after all you and me went through with this, that is the only thing left
ok, one other thing before I stand by my suggestion. check the bulb for the check engine light and see if it works. it does pass current to the ecm.
the lack of communication is the issue. a used ecm not flashed to your truck will cause a non communication from vin mis match
it still has to be programmed to your vin number.
what kind of scan tool are you using??
you did not happen to check the voltage to the check engine light bulb??
thats a good idea.
again, what kind of scan tool do you have
also, any shop that has a tech 2 tool or communicator can flash it for you.
what are you using that wont communicate with the truck??? it is obd2 and any quality scan tool will work.
since 1996 the 16 pin as been around. federal guide lines are required that all manufactures must follow when it comes to protocall. every vehicle has the same number of pins. there is no difference in the access of info.