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mr. b. rector
mr. b. rector, kia master tech
Category: Kia
Satisfied Customers: 301
Experience:  KIA master tech obtained in 2008. Fix it right the first time always.
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2001 sephia won't start the injectors are not pulsing I

Customer Question

2001 sephia won't start the injectors are not pulsing I checked all relays and fuses the car was sitting 3 years checked for carotid wires none to be found it will start with carb cleaner
Submitted: 1 year ago.
Category: Kia
Expert:  mr. b. rector replied 1 year ago.
Hello, I apologize for the delay. Starting with carb cleaner does show you are getting spark, the injector pulse is controlled by the engine controller module via the under hood fuse block. Check all fuses in the fuse block, if all good remove the positive and negative battery terminals and jump together, leave connected for at least ten minutes and then remove jumper wire and reconnect to battery. Check that area out and reply back. Thanks for letting me help, Mr. B
Customer: replied 1 year ago.
What does shorting out the terminals do
Customer: replied 1 year ago.
Also I changed the ecu under center of dash
Expert:  mr. b. rector replied 1 year ago.
The shorting of the terminals resets the computer, sometimes logic issues can occur with a module, and just like your computer at home you just need to shut them down for awhile and reboot., But since you said you replaced the ecm, this probably will not help. I would give it a try, you just never know. If this does not help, reply back and I will what I can do to further assist you, Mr. B
Customer: replied 1 year ago.
I've been trying to trace wire's for days
any hardware components cause this
oh and I also changed the power distribution box
Expert:  mr. b. rector replied 1 year ago.
The ecm, the distribution box and wiring via the ignition switch are about all that could affect the injector pulse. I suggest to clean all grounds at the fuse box and near the computer, if you can get star washers please install them after cleaning the ground contact area. Mr. B
Customer: replied 1 year ago.
Those sharp washers that did in
I've tried running new grounds to ecm
battery - to body and block
even though the grounds look clean
Expert:  mr. b. rector replied 1 year ago.
If you have an ohm meter, check continuity from the battery ground to several different points around the engine, you should have nearly complete continuity at all points. If you encounter a fairly high resistance like 3ohms or higher check the grounds again. Mr. B
Customer: replied 1 year ago.
My ohm meter beeps no numbers
unless there's a different setting
it has several settings
the fuse to the pump don't have +
What's the main order to follow when tracing the wires
Expert:  mr. b. rector replied 1 year ago.
Check the fuel pump relay in the under hood fuse block, see if it is energizing.
Customer: replied 1 year ago.
It's not
Expert:  mr. b. rector replied 1 year ago.
Ok, there is always 12 volts at one terminal on the fuel pump relay. This 12 volts is waiting for the coil side of relay to be energized to let the 12 volts pass through and onto the fuel pump. Pull the fuel pump relay and check for 12 volts on one terminal, with ignition off. If you have 12 volts then turn ignition on still with relay out and see if you have 12 volts on one of the other terminals. Check out and reply back with results, Mr. B
Customer: replied 1 year ago.
Yes right next to it 12 volts
Expert:  mr. b. rector replied 1 year ago.
Ok , you have 12 volts on one of the terminals, now with the ignition switch in the on position you should have voltage on one of the other terminals, if you do have voltage on the other terminal and the fuse is still not showing power with the relay reinstalled, then either the relay is bad and no closing the contacts inside or there is an open circuit between the relay and the fuse. The fuse will only have voltage to it when the relay contacts are closed.
Customer: replied 1 year ago.
Replaced relay still nothing
Expert:  mr. b. rector replied 1 year ago.
So you do have voltage at the relay terminal when the switch is turned on? Have you checked the injector fuse? Also is the main relay clicking when ignition is turned on? I apologize for so many questions, it can be quite difficult diagnosing from a remote site.
Customer: replied 1 year ago.
Pulled main relay it clicks
injector fuse is good and has 12 v
Expert:  mr. b. rector replied 1 year ago.
Ok, now check to see if you have voltage at one side of the injectors, with key on engine off.
Customer: replied 1 year ago.
Yes I have voltage at all 4 injectors
Expert:  mr. b. rector replied 1 year ago.
Ok, either there is an open between the ecm and the injectors or the connectors have a bad connection. There is not another connector between the ecm and the injectors, check for good pin tension at the injectors and at the ecm, check for bent or backed out pins and or sockets also corrosion, if you are certain the connections are good, then the ecm is not sending a pulse signal to the injectors, that is done on the wire without the voltage with key on engine off.
Customer: replied 1 year ago.
So what do I check what wires colors
Expert:  mr. b. rector replied 1 year ago.
Just pull the connectors and check for pin tension and for anything that might look suspect. I apologize I can not give the exact info on the ecm connectors, KIA is phasing out the schematics on those year models, info is very vague.
Customer: replied 1 year ago.
i have these
Customer: replied 1 year ago.
ive been trying for 4 days
Expert:  mr. b. rector replied 1 year ago.
My schematics look just about the same, I do believe a close up inspection of the connectors and harness will reveal an issue if that ecm you replaced is good.
Customer: replied 1 year ago.
the connectors look good
is there a way jump to see where the fault is
Expert:  mr. b. rector replied 1 year ago.
Not recommended, you may cause an issue with the ecm. I suggest following the injector wires back to the ecm.
Customer: replied 1 year ago.
so do check the volatage at ecu pin fuel 8njectors
Expert:  mr. b. rector replied 1 year ago.
No, you have voltage at the injectors already, ecm supplies ground for the pulse.
Customer: replied 1 year ago.
what wite is my pulse from ecu
Expert:  mr. b. rector replied 1 year ago.
correct
Customer: replied 1 year ago.
oops I meant what wire
Expert:  mr. b. rector replied 1 year ago.
I understood lol
Customer: replied 1 year ago.
What pin at ecu
Expert:  mr. b. rector replied 1 year ago.
3, 4 , 31, 32
Customer: replied 1 year ago.
So all 4 wires need to be continuity tested
Expert:  mr. b. rector replied 1 year ago.
yes
Customer: replied 1 year ago.
to what point
also does this control fuel pump
Expert:  mr. b. rector replied 1 year ago.
I think you have an ecu issue, we have to determine what is functional and what
Customer: replied 1 year ago.
that was replaced
Expert:  mr. b. rector replied 1 year ago.
new or used?
Customer: replied 1 year ago.
used working one
Expert:  mr. b. rector replied 1 year ago.
Have you checked the wires yet?
Customer: replied 1 year ago.
do I leave the ecu plugged in to trace
Expert:  mr. b. rector replied 1 year ago.
No , remove battery terminal ground, unplug the ecu and the injectors, ohm the harness from the injectors to the ecu connector. Just leave your test probe hooked to the injector connector starting with anyone and probe pins 3w, 4, 31, and 32. if you do not get continuity on any of those pins with the other probe hooked up to any injector, then you have an open circuit.
Customer: replied 1 year ago.
ok ill check
Expert:  mr. b. rector replied 1 year ago.
ok
Customer: replied 1 year ago.
They all have continuity
Expert:  mr. b. rector replied 1 year ago.
Are using a noid light tester to check for pulse?
Customer: replied 1 year ago.
If I jump fuel pump it should start if I'm pulsing
I used a 12v instrument cluster bulb bent down leads
Expert:  mr. b. rector replied 1 year ago.
Never tried that before, you can get a noid light kit at just about any parts store. But yes, if its pulsing and you have fuel supply it should start, that is if the fuel is good. You did say it had been sitting for three years, I hope thats not the same fuel.
Customer: replied 1 year ago.
yes same gas but the fuel pump don't run unless I jump it
Expert:  mr. b. rector replied 1 year ago.
There is no way that vehicle is going to run on three year old fuel, I will opt out maybe another expert can help, Mr. B
Customer: replied 1 year ago.
I understand that but fuel pump wont run