Okay, new guy here, thanks for the space and nice forum as well guys.
Here is the run down. I am a GM technician at a Chevrolet dealership in N/East Ohio and my sister owns a 04' xg350. Last winter she has a problem on the highway when she would accelerate, it would buck and hold back and sometimes stall out. Check engine light came on, I scanned it and I believe it was a p1511 for the Accelator Pedal Position sensor. I followed the flow chart for the code off of Alldata and everything checked out fine, and the circuit was fine as well.
Now, this winter, it is happening like every day. Did a little research online and found there is a TSB for the Accelator Pedal Position sensor, however it shows no diagnosis for the concern, pretty much to just either replace the APP sensor, the TPS sensor or the ECM.
So my question is, before I spend $150 for a APPS which I think is the problem, does anyone know if there another problem out there with these with a different sensor, or if there is a reburn for the ECM for this issue or something?
I would like to see if there is a common problem out there with these if anyone knows here before I take a $150 guess you could say.
Are you sure you didn't mean a P1151 error code? Most Hyundai engines have a seperate throttle position sensor and air idle controller, but it appears both functions were consolidated to an integrated ETS unit on the XG350. The following provides more definative methods for testing the APS portion of the sensor. Tech info is available on http://www.hmaservice.com/. I hope this helps.
ELECTRONIC THROTTLE SYSTEM (ETS) & ACCEL. POSITION SENSOR (APS)
CIRCUIT DIAGRAM
HARNESS INSPECTION PROCEDURES
SENSOR CHECKING (IDLE SWITCH)[/align]
USING VOLTMETER[/align]
1.Disconnect the APS connector.[/align]
2.Check the continuity between terminal 4 and sensor ground.[/align]
Thanks for the detailed information Sir. It appears as if those are same checks I went through last year when this first started hapening if I can recal correctly. Could be the P1151, I knew the numbers but couldnt remember the correct order of them, haha. So it appears as if its either faulty wiring to the APS or a bad TPS sensor, and not a bad APS sensor. Doesnt show anything to actually replace the APS sensor, only the TPS. So, my next question is, is this possibly a common problem of faulty TP sensors on the XG350? Makes sense, could be a bad TPS, but, why the ECM throw a APS malfunction code instead of a TPS code?
So, my next question is, is this possibly a common problem of faulty TP sensors on the XG350?
I was reviewing the two possable error codes:
P1151 = Accelerator Position Sensor (EMS) Circuit
P1511 = ISC Open/Short Coil2 or
P1511 = ISC Circuit Open/Short
Both codes indicate a circuit problem, P1511 indicating a short or open circuit. Both sensors share a common power and common ground lead, but if the harness and both the TPS and APS sensor checks indicate all is OK, I'm not sure what to say. If the fault is in one of the common leads, the error code may simply default to the APS.
Oh man, thats sweetness there. Thanks. So it appears as it should be a wiring issue, and not the sensor itself. However, what do they refer to as the APS2 sensor? APS1 is the main APS sensor, so would the secondary sensor be the TPS?
Issue with accelerating...sensor? Code P1511
