2009 Santa Fe 3.3L FWD - P0501 with ABS and ECS lights on - Hyundai Forums : Hyundai Forum
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post #1 of 17 (permalink) Old 03-19-2017, 02:20 PM Thread Starter
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2009 Santa Fe 3.3L FWD - P0501 with ABS and ECS lights on

I have a 2009 Santa Fe 3.3L with FWD. My ABS and ECS lights are on, and the only code I can pull from the computer is a P0501 which indicates an issue with the vehicle speed sensor. The speedometer was working intermittently over the first couple of days when this problem first appeared but I haven't had any issue with it in the last couple of weeks.

I've been looking but I can't find a VSS on this vehicle. I've pulled the air intake box/battery/ECU out and can't see anything that looks like a VSS, or even a wire to follow to find one. Looking up from underneath doesn't help. From what I've read, some Hyundais take their speed data from the wheel speed sensor, but no code is being thrown for one of those being bad. The tone rings on both front wheels appear to be good, as far as I can tell. They're not loose or cracked and I don't see any missing teeth. I've replaced wheel sensors and tone rings on a couple of other vehicles that I've had and the ECU has always thrown the proper codes to tell me where the issue was.

Anybody have any advice? The service manual and wiring diagrams indicate there should be a VSS somewhere...?

EDIT: From another post on this forum (Vehicle speed sensor, I see that the VSS is supposed to be down at the bottom of the transmission, right in the back. On my vehicle, there is no VSS, just a metal cap with a loop on it. ??????

Last edited by JJTucker; 03-19-2017 at 02:39 PM.
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post #2 of 17 (permalink) Old 03-19-2017, 03:08 PM
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ECS functional diagram attached.
Description of ESC Control
ESC system includes ABS/EBD, TCS and AYC (Active yaw control) function.
ABS/EBD function : The ECU changes the active sensor signal (current shift) coming from the four wheel sensors to the square waveform. By using the input of above signals, the ECU calculates the vehicle speed and the acceleration & deceleration of the four wheels. And, the ECU judges whether the ABS/EBD should be actuated or not.
TCS function prevents the wheel slip of drive direction by adding the brake pressure and engine torque reduction via CAN communication.TCS function uses the wheel speed sensor signal to determine the wheel slip as far as ABS function.
AYC function prevents unstable maneuver of the vehicle. To determine the vehicle maneuver, AYC function uses the maneuver sensor signals(Yaw Rate Sensor, Lateral Acceleration Sensor, Steering Wheel Angle Sensor).
If vehicle maneuver is unstable (Over Steer or Under Steer), AYC function applies the brake pressure on certain wheel, and send engine torque reduction signal by CAN.
After the key-on, the ECU continually diagnoses the system failure. (self-diagnosis)If the system failure is detected, the ECU informs driver of the system failure through the BRAKE/ABS/ESC warning lamp. (fail-safe warning)
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File Type: gif scmbr6504n.gif (24.4 KB, 8 views)

2010 SantaFe 3.5 AWD

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post #3 of 17 (permalink) Old 03-19-2017, 04:06 PM Thread Starter
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Thanks for the response. My speedometer has stopped working again, so if there's no dedicated VSS on my vehicle, does anyone know where the speedometer data comes from? The right front wheel speed sensor? A fault there might explain why I have both no ABS/ESC and no speedometer.

The ABS/ESC lights have been off when the vehicle was started and come on shortly thereafter before the vehicle starts moving if that indicates anything. Usually, however, they're on right away and stay on.
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post #4 of 17 (permalink) Old 03-19-2017, 05:57 PM
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Wiring/connector in that area is exposed, so it's something to consider before actual sensor replacement.
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post #5 of 17 (permalink) Old 03-19-2017, 06:02 PM
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Quote:
Originally Posted by canderson View Post
Wiring/connector in that area is exposed, so it's something to consider before actual sensor replacement.
Part in your pic is not 0501.. that is a shaft speed sensor in pic that is used shifting and watching for internal clutch slippage 0731/32/33/34/35,, and 0720 or 22 output shaft sensor fault..

VSS is in the top of final drive where an old speedo cable would have went, but now it a rotary switch,, connector with 3 wire on it

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post #6 of 17 (permalink) Old 03-19-2017, 06:05 PM
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I kinda have issue with the text on the pics...

They show wheel speed sensor,,,, but I would expect to ABS/ESC light with this part being at fault...

Most all 0501 instance with loss of speedo should reflect on VSS at transmission...

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post #7 of 17 (permalink) Old 03-19-2017, 06:10 PM
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Quote:
Originally Posted by sbr711 View Post
Part in your pic is not 0501.. that is a shaft speed sensor in pic that is used shifting and watching for internal clutch slippage 0731/32/33/34/35,, and 0720 or 22 output shaft sensor fault..

VSS is in the top of final drive where an old speedo cable would have went, but now it a rotary switch,, connector with 3 wire on it
Crap. Grabbed the wrong photo. I rename them here just to avoid this, and managed to do it anyway. Note the filename is even (derp) "Output Speed Sensor.pdf".

Looks like you've already got the good one up and posted, though.
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post #8 of 17 (permalink) Old 03-19-2017, 06:59 PM
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Quote:
Originally Posted by sbr711 View Post
They show wheel speed sensor,,,, but I would expect to ABS/ESC light with this part being at fault...
I assume you missed the title of the post then
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post #9 of 17 (permalink) Old 03-19-2017, 08:19 PM Thread Starter
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I've been looking for the three-wire VSS connector, and assuming I'd find part # 46510-39700 (the gear-driven VSS sensor) attached to it... but I simply can't find it. I can only find one picture telling me exactly where it should be, as I linked to in my initial post, but on my vehicle I have the metal piece with the loop in it as shown in the shoddy picture I've included here. This is down on the bottom of the transmission, closest to the center of the vehicle. Is there somewhere else I should be looking, or should I be paying attention to the wheel speed sensor instead?
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post #10 of 17 (permalink) Old 03-19-2017, 08:22 PM
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Quote:
Originally Posted by AUTOSPARK View Post
I assume you missed the title of the post then
I will submit myself to public flogging.. RIF....

Been long few weeks, getting beater ready for 17yr old son to drive, pad, rotors, drums, wheel cylinders, oil, coolant, tires, flush with DOT-4..

Drove home from in-laws, look like thermostat (1993 + 235,000 mile) with poor heat and idle stay up.. next to ready for clutch,, but took boy out today and called off shifts for him, but he still need to learn to listen to engine and work clutch pedal together.

1993 Toyota Corolla M/T

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