Kia Forum banner
1 - 20 of 31 Posts

· Registered
2011 Carens 2.0 L4 CRDI 140hp, Manual
Joined
·
20 Posts
Discussion Starter · #1 ·
I have a Kia Carens 2.0 crdi 2011, it has 170 000 km, recently it has hard start with long cranking, Cranks normally till battery dies sometimes but very hard to Start, even with quick start spray, once started the car runs like there were no problem at all, on the scan tool I have one fault: "crankshaft position sensor performance range/circuit", I decided to check the sensor circuit (three ends on the connector: ground, reference, signal), while inspecting the circuit the reference wire showed only around 2.5V, I know that the standard for sensors is 5V or 12V, the wires of the reference have no short and the problem should be with the ECU.
I want to simulate 5 or 12V voltage to the reference and see if the problem disappear to confirm its the faulty ECU, but I don't know what is the voltage the reference wire on this car.
So my questions are:
1. can any one tell me the voltage or have a diagram to this car where I can find it please.
2. If it is confirmed faulty ECU, can it be repaired since it is only one wire voltage altered, or should it be replaced?
Thanks to all
 

· Registered
2011 Hyundai ix35 AWD CRDi
Joined
·
592 Posts
I'd be inclined to replaced the crank sensor with an OEM unit if you can without diving into this too much. Hyundai/Kia crank sensors are a very common fail point. I ha a Santa fe with the 2.2 version of this motor. It definitely presented itself as a crank / no start and gave me warning signs when it got hot it would quit then it simply would not start and no activity on the tacho when cranked either. Instantly fired up with new sensor.

I'll be back after I get on my other PC and check the manuals
 

· Registered
2011 Carens 2.0 L4 CRDI 140hp, Manual
Joined
·
20 Posts
Discussion Starter · #4 ·
Mine didn't have a hard start when hot, it is unpredictable at all, and with the new sensor on the same problem persisted, the old one was not faulty and its resistance was ok (1200 Ohm), I read that the problem can be a short on the wire or faulty ecu voltage regulator responsible for this wire.
 

· Registered
2011 Carens 2.0 L4 CRDI 140hp, Manual
Joined
·
20 Posts
Discussion Starter · #6 ·
The scanner didn't throw the code but the message "crankshaft position sensor performance range/circuit"
 

· Registered
2011 Hyundai ix35 AWD CRDi
Joined
·
592 Posts
Mine didn't have a hard start when hot, it is unpredictable at all, and with the new sensor on the same problem persisted, the old one was not faulty and its resistance was ok (1200 Ohm), I read that the problem can be a short on the wire or faulty ecu voltage regulator responsible for this wire.
Information worth including on original post. I've also read of people using non OEM sensors for replacements and still having issues too.

Here's the resistance Kia quotes. I'll upload what I have so you can work through it. This will be Eurpoe market but should be relevant , just a question whether or not it matches your build
Rectangle Font Parallel Electric blue Circle
 

· Registered
2011 Carens 2.0 L4 CRDI 140hp, Manual
Joined
·
20 Posts
Discussion Starter · #11 ·
Ok this is the scanner report, and in fact the replacement sensor was not OEM, because I didn't find it in my town, and as I was busy I bought that one. But the problem persisted.
Font Screenshot Electronic device Darkness Multimedia
 

· Registered
2011 Carens 2.0 L4 CRDI 140hp, Manual
Joined
·
20 Posts
Discussion Starter · #14 ·
Ok, exactly, there no signal reference as I thought, like mine there is a signal + (present on multimeter 2.5V), and a signal - (also present -2.5V) with the ground, so this is confusing now for me, can an oscilloscope help in this situation?
 

· Registered
2011 Hyundai ix35 AWD CRDi
Joined
·
592 Posts
Ok, exactly, there no signal reference as I thought, like mine there is a signal + (present on multimeter 2.5V), and a signal - (also present -2.5V) with the ground, so this is confusing now for me, can an oscilloscope help in this situation?
Well what you see on one is same for both so that's good news I guess, I did no post the other image . yes I agree I am not trusting the 0.6V at this stage either. What brand sensor did you put in and what resistance was on the old and new?
How accurate is your meter? Is it something decent FLUKE/Agilent etc or something really cheap
 

· Registered
2011 Carens 2.0 L4 CRDI 140hp, Manual
Joined
·
20 Posts
Discussion Starter · #18 ·
The resistance on the both sensors was arround 1010 Ohm with good multimeter Mastech my-64, i use it always to measure resistors values for circuits use and it is very accurate to the value noted on resistors (to note the measurement was taken @~30°c not @20°c as in the manual you shared and resistance get bigger the warmer the climat is), for the brand
Font Material property Gas Ticket Rectangle
at the store he sais the brand is a good alternative to the original
 
1 - 20 of 31 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top