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Hello and Welcome to Justanswer, My name is Steve and I am here to try and assist your with your question
Sounds like a bad computer by all the symptoms you have of no 5 volt reference and no spark and fuel
I need all the help I can get on this one
I have installed a used PCM
You could also have a bad relay to the computer. I would replace this first before the computer
I see you have already replaced the computer
where is it located because I have also replaced a few relays?
It is located in the fuse box under the hood or were the engine is
okay, what should I do if I replace the relay but problem still exsists?
could a shorted sensor cause this problem?
Yes it could I have seen the dpfe sensor cause this concern. Unplug it and see if it will start.
any sensor requires reference voltage could cause this
I just unplugged the DPFE and it is doing the samething
Most common is the dpfe sensor or delta feedback for the egr system. Tells the computer were the egr is Do you know where it is located?
what is it doing?
it cranks but dont start.
oh, the DPFE is on the left side of the engine and it had vaccume lines going to it, correct?
remove the plastic cover over the top of the engine three 10mm bolts on the drivers side is a silver box with two hoses attached to the bottom and a three wire connector unplug it
And if that does not work unplug the tp sensor or throttle position sensor
I have already done that
I have unplugged all the sensors from the throttle body and on the left side of the engine
Ther is one other sensor it is located on the gas tank it is a ftp sensor or fuel tank pressure sensor
You will see three wires coming out of a connector unplug it and see if it will start.
okay, be right back
are you still there?
same results. It cranks but no start
yes I am here
same results, cranks but no start
need to see if the check engine light comes on with the key is on let me know
it doesnt come on at all
If it does not come on then it is a power or ground concern to the computer
and I cant pull DTC's with our scan tool
Ok that answers the question you are missing power are ground
need to check the fuse and replace the computer relay to start
can you tell me which pins are the ones that should have power and ground to the PCM?
Fist I want you to check pin 16 at the test connector for power
if I dont have power there then what?
then you have a blown fuse
do you know wher the fuse and relay are located?
pin 16 at thePCM is grounded and doent have power
ok I will get you locations hang on
this is the fuse box under the hood
replace the eec power relay with the horn relay and see if it starts
okay, would that cause pins 16 to ground
the fuse is in location number 24 is it blown?
all fuses are good
no power to it is the cigar fuse
under the dash
let me check
I do have power to the cigar lighter
are you sure it is pin 16
and did you swp out the relau
yes I did
and the fuse numb 24
Then you may have a ground concern it comes off the ground wire to the body small wire is it attached and cleaned
need to check the fuse under the dash
fuse 24 was good
also goes to the ign system and the pcm relay
Ill get a diagram and number
fuse number 30 and fuse number 20
fuse number 30 is a 30 amp fuse this is the fuse that is blown
where is this fuse box located?
is this the fuse box under the dash?
yes it is the fuse box under the dash see the pics
yes sir. I have checked all the fuses in that box and they are ll good
oh, I have power to my coils but no groung
Then it is a ground problem need to check computer ground off of the negative battery cable. Small wire goes to the body make sure it is tight and clean
it is tight and clean
then I will send you powe and ground pins to check you are missing one of the two
ground is pin 3,21,51,77,103 power pins are 37,55,71.
The pins are numberd on the connector
do you want a wiring diagram
one more for you for pins and locations
This is all I have
are there any other questions on your concern?
If you do not have any further questions please press the green accept button thanks.
I am checking my power and ground
k let me know if you have futher questions and check out the pics I sent you on the pins
here is the pinpoint test from the workshop manuale
Diagnostic Trouble Code (DTC) P1001 indicates that Key On Engine Running (KOER) self-test cannot be completed.
This Pinpoint Test addresses the following concerns:
NOTE 1: Some alternative fuel vehicles that are capable of running on either gasoline or Compressed Natural Gas (CNG) contain Electronic Engine Control strategy software that does not allow the completion of KOER self-test while running on CNG.
NOTE 2: Some alternative fuel vehicles that are capable of running on either gasoline or Liquified Petroleum Gas (LPG) contain Electronic EC strategy software that does not allow the completion of KOER self-test while running on LPG.
NOTE 1: If failures are present in the following components or systems, this can cause the Electronic EC strategy from not completing KOER self-test or cause the PCM to generate a Scan Tool communication error message: idle speed control; EGR system; fuel control system; electronic secondary air system; vehicle speed sensor circuits; mass air flow sensor circuits; transmission range sensor circuits.
NOTE 2: For information on retrieving MIL and non-MIL DTCs, refer to Section 2A , Continuous Memory Self-Test.
I dont have ground on pin 21
and I dont have power to pins 37 and 71
check the wiring diagram I sent you
Do you have power at the injectors red wires
37 and 71 goes to the PCM relay but I didnt see pin 21 on the diagram
37 and 71 also goes to the injectors same wire see if you have power to the red wire of the injectors helps determine where you are missing power.
pin 21 comes from the ign system fuse
I dont have power to the injectors or pins 37 and 71
then the relay is bad or the fuse to the relay or the wiring from the fuse box where the relay is
fuse 24 in the fuse box under the hood ok 30 amp fuse?
You swaped out the relay?
let me make sure, yes the relay is new
and fuse #30 under the dash fuse box ok check for power on that fuse with the key in the on position may have a bad ign switch
use a test light check both sides of fuse 30 under the dash
In fact check for power on all fuses both sides with a test light fuse 24 in the fuse box under the hood fuse 30 in the fuse box under the dash and so on. with the key on
pin 21 is power not ground
I have also seen water get on the fuse box from a leaking windshield and cause all kinds of problems in the fuse box under the dash
very impotant to check for power on both sides light should be bright and not dim
all of my guses were goodhowever I dont have any power to me eec relay
how are the fuses I mentioned with the test light ?
the light was bright
what number are you missing power on the relay
30 oe 86 on the relay?
I didnt have power on any of the legs on the relay
no power to the relay at all
to refresh you used a test light and the fuses I had you check are good both sides for power with a test light and they are bright?
then the re is a problem in the fuse box
where the relay is check the wires go to 30 and 86 of the relay
okay, is there a quick fix or does it need to be replaced?
turn the fuse box upside down and pull the plastic off the bottom and check the wires
make sure the connectors are tight and the wiring is good
I have spent a lot of time with you
please do not forget to hit the green accept button so I can get credit thanks.
please hit the green accept button so I may get credit thanks