[benr]

Good evening, I'm hoping that I can get some advice on a 2007 Tucson (2.7, 2wd) that would intermittently die while driving and now has a no-start condition.

Quick background - about 7 months ago my wife's Tucson would randomly shut off while driving. Did a lot of research and replaced what were usual culprits (CPS, which did not correct the issue, then fuel pump). Car would start but would then just shut off still after random amounts of time. Gave up and bought a new car. Stored the Tucson in the pole barn until today. Weather is nice so I want to dig into this now.

I tried earlier today and I'm getting cranking but no starting.

I've tried testing the fuel pump relay by removing the horn relay (the horn works), and plugging that relay into the fuel pump relay. Still nothing. I also am not smelling any gas, though I'm not sure if I would smell it anyway.

I think my next step should be to check for fuel pressure, but I'm not sure where the schrader (sp?) valve is to check. I do not have a gauge so I'm hoping I can just unplug something and have it spit out, at least just to see if there's something coming through the line. If someone can let me know where that is on the fuel rail, it would be very helpful.

If there is pressure -- I've read that these models have an issue with water getting into the relay box under the hood (please let me know if this is false). Then my next step would be to inspect the base of the relay box. I'm not sure how to unattach this, so any instruction would be helpful. I know there are two bolts but i'm not sure if i need to remove any harnesses to inspect.

I am willing to test voltages and things like that, but the only tool I have is a multimeter and I do not know where to test for these things or what results I should be getting.

So I'm looking to test for fuel pressure, then the relay box, then god knows what.

Should I maybe try starter fluid into the air intake prior to any of this to test for another issue?

I'd like to try and narrow this down further, but I do not know auto engines well (small engine stuff is a different story).

Thanks for any help you all can give me. I'd really like to have a third vehicle instead of a 4000 paperweight blocking one of my garage bays...

 

[avisitor]

Well, usually for a cranking, no start condition, should check for the basics
Fuel, air, spark, timing, exhaust, compression, etc

For example, check to see if you have spark at the plugs
Listen for fuel pump prime when key is first turned to on position
If you have push button start then you can try to feel if injectors are firing
If it is a fuel issue then spray starter fluid into the intake plenum .. see if it starts
If it might be an issue with clogged exhaust then remove upstream O2 sensor and start engine to see if will run
This testing should give you an idea of where to look

Good luck

 

[charlescrown]

If possible scan it first and see if there are any fault codes. This can be done with a cheap bluetooth unit from eBay and a free phone app called Torque Lite. If you can't hear the pump turning on there are other issues. There are 2 sensors involved with no start, the crankshaft position sensor and the camshaft position sensor. You may have a wiring problem so have a good look for burnt/damaged wiring at the sensors.

 

[camper]

Get OBD2 reader first.

To test the fuel pump, turn the key to on for 10 sec, then turn off, repeat several times to build up oil pressure, then unbolt the fuel line to see if there's gas spray out

Clean all of the wires, electric parts can't work without negative terminals.

For crank no start problem, you can tow to the dealership. Don't go to any other mechanic shops. Hyundai dealer only charges $150 to diagnose the electrical problems, and they can find out the problem

 

[benr]

Campler -- where would I unbolt the fuel line? Near the fuel pump as opposed to under the hood?

Charles and Camper - When it comes to the scanner, the original issue was throwing no codes (which is normal when it comes to the CPS from what I had heard). One of the last times we were driving it, out of nowhere the check engine line came on. We were half a minute away from autozone so we got it scanned while the car was still running. I have the codes below, the check engine light was never on until this incident. Some of the codes are very, very strange (System Voltage Malfunction???) which makes me inclined to think it's electrical, thus the relay box.

I'm not sure if the order matters, but they are in the order that they were displayed on the scanner (ex. 1 of 10 -> 10 of 10) --

Device - Actron Elite AutoScanner

C1611 CAN Time-Out EMS / ECM
C1612 CAN Time-Out TCM / TCU
C1503 TCS / ESC (ESP) Switch Error
C1513 Brake Switch Error
P0560 System Voltage Malfunction (Current)
P0170 Fuel Trim (Bank 1) (Current)
P0171 Bank 1 System Too Lean (Current)
P0170 Fuel Trim (Bank 1) (Confirmed)
P0170 Fuel Trim (Bank 1) (Pending)
P0171 Bank 1 System Too Lean (Pending)

Thanks for any insight.

 

[charlescrown]

Correct. The crank sensor usually has no code. The cam does. The crank sensor is a definite engine stopper that's why I suggested you check the plug wiring for damage. They go hard with time, break up and start shorting wires.

 

[benr]

Yeah, it was actually replaced twice. First with a pulled part, then with a new OEM part. I've ruled it out at this point.

 

[AUTOSPARK]

So I'm looking to test for fuel pressure, then the relay box, then god knows what.

I think your attacking things in the wrong order. Since you don't have the tools to do a fuel pressure test (and it's a PITA to do anyway), why not check the fusebox first. Measuring voltages is much easier than measuring fuel pressure. Start with the simple tasks and work your way up to the more difficult things. The chances are you'll find the fault before you even need to do anything difficult.

All you need to do to know if the fusebox is the problem is measure the voltage on the fuse that supplies power to the engine sensors. I think it's even marked SNSR on the fusebox cover so it should be easy to find it. You should have 12V on that fuse when the ignition is switched on. If you don't have 12V, that's why the engine wont fire.

 

[benr]

Thanks autospark, I will look at it tonight or tomorrow.

When I was trying to start it, it was connected to a running dodge ram, the power was there just wouldn't fire up.

Will let you know. Thanks.

 

[avisitor]

So after all this, what do we know so far?
Is there spark?
Is there fuel?
Is there injector pulse?
Does the fuel pump prime when key is first turned to on position?
Does fuel pump run during crank?
Was starter fluid sprayed into intake plenum to see if it would start?

Code which is of main concern is the system voltage malfunction
If you feel you need to check fuse box in engine bay
Then would check all fuses and relays first
It might show where a fault exist???

Good luck

 

[benr]

Is there spark? Will check tomorrow. When it was parked a few months ago, yes.
Is there fuel? The tank is nearly full, new pump installed weeks before parked. I'd like to check fuel pressure but I do not know how and do not have the equipment. Certainly willing to test for pressure using an 'unorthodox' method.
Is there injector pulse? I'm a novice. I'll google what that is and see if I can check for it tomorrow.
Does the fuel pump prime when key is first turned to on position? I cannot hear anything in the back. I do hear a hum, but it sounds like it's coming from the dash when the key is turned to on position.
Does fuel pump run during crank? I can't hear that thing when I'm cranking it. I'll remove the back seat and get another set of ears tomorrow.
Was starter fluid sprayed into intake plenum to see if it would start? No, doing that tomorrow.
I can inspect the fuses visually but I do not have a way to test the relays unless I find another battery. Even then I'll need to read up on how to do it.

Forgive me, but I have limited knowledge on auto engines and anything fuel injected.

In all honesty, everything has just been very erratic over the course of the last month driving the vehicle. Transmission seemed weird once or twice, random stopping, problems starting the vehicle, all of these random check engine lights out of nowhere. It leads me to believe it's something electrical.

Will do a lot of investigating tomorrow. Thanks.