Kia Troubleshooting Questions? Ask a Mechanic
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the MAIN relay PCM relay is in the underhood fuse panel
click here to view the location
let me know if you need more help
yes the MAIN relay is the EFI relay
there are also 4 fuses after the relay INJ , ECU , O2 UP , O2 DWN
they are all under the hood
turn the key on and check power to those 4 fuses if you have power to those fuses with KEY on the Relay is working
the fuel pump gets power from the FUEL pump relay
the fuel pump relay is also in the relay panel under the hood
if you remove the fuel pump relay and turn the Key on you should have power to 2 of the PINS
the computer grounds one of the PINS to energize the relay
you need to test that you have power to 2 pins of the Fuel relay with key on..
if you do have power to 2 of the pins .. the computer is most likely not energizing the relay... the computer needs to see a crankshaft sensor signal to ground the relay
let me know if you have power to 2 of the pins at the fuel pump relay..
ok one of two things is happening
either the PCM is not grounding the RELAY
or the FUEL CUT SENSOR is not allowing the power to run to the PUMP
the fuel cut sensor is in the right side of the engine compartment (Right front fender Area under the hood)
the wires to this reset switch are RED and YELLOW... see if the switch needs to be reset.
let me know
if the PCM has a bad power or ground input... or it does not see a signal from the Crankshaft sensor it will not energize the pump
did you test for power directly at the reset switch? both wires with key cranking?
there should be power to both RED and YELLOW for a few seconds when the key is first turned on..
also verify when you turn the ignition key on that the ENGINE light is coming on for the bulb test.
you also need to Verify you are getting an RPM signal while cranking... if there is no RPM signal the crankshaft sensor could be the problem... the PCM will not energize the fuel pump without RPM signal
Verified power checks for the inertia switch (red wire= o volts, yellow wire = 12 volts)
the engine light bulb do illuminate.
Not sure what a RPM signal is 9where should i look for this..
with the inertia switch plugged in do you get power to the red wire? whith key on for a second?
if you have power on the Yellow but nothing on the RED while cranking the inertia switch is bad
Ok let me know how you make out