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G500 no gas pedal response
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Posted 9/27/2020 6:12 AM
4x4abc



Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
5000
G500 no gas pedal response

my 2002 refused to react to the gas pedal.
Installed a new pedal sensor.
Expensive!
No improvement.

Any wisdom in this group?
#242040
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Author
Posted 9/27/2020 8:57 AM
DUTCH
Administrator Doppelgänger




Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
5000
RE: G500 no gas pedal response

Any codes?

Mass Air Flow Sensor?
#242042 - in reply to #242040
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Posted 9/27/2020 1:47 PM
4x4abc



Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
5000
RE: G500 no gas pedal response

I have a cheap code reader - will try later today.
Why are you thinking MAF sensor?

by the way - car runs for about a minute and then shuts down. Starts again without a problem.
But won't accept gas.
On one of the facebook G forums another 2002 owner reports the same behavior.
#242043 - in reply to #242042
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Author
Posted 9/27/2020 11:43 PM
Otiswesty
Administrator




Date registered: Jun 2007
Location: Portland, Oregon
Vehicle(s): 463.241, 461.213
Posts: 3002
2000
RE: G500 no gas pedal response

Makes me think of the problems I had with the throttle body on my 1995 G320. I guess there are stepper motors in the TB that can go bad. My symptoms were a low idle that would sometimes also stall with accelerator use.

I think a MB Star diagnostic system interrogation will provide the most information.

#242044 - in reply to #242043
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Posted 9/28/2020 1:05 AM
4x4abc



Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
5000
RE: G500 no gas pedal response

no Star available
and can't get to the dealer because the truck does not drive
#242045 - in reply to #242044
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Posted 9/28/2020 5:06 PM
ewalberg
Expert




Date registered: Apr 2006
Location: Past: San Francisco. Present: Germany
Vehicle(s): 2000 g500
Posts: 1887
1000
RE: G500 no gas pedal response

I had something like this on my Lotus Elise. When cold it would start and run fine. After it had warmed up, it would technically start... but it would idle very badly (bouncing) and then die if I tried to give it any throttle. It was a sticky throttle body... it was surprisingly difficult for the shop to diagnose the throttle body as the problem.

I had my Throttle Position Sensor go slowly bad on my G500, but that only manifested itself on occasionally responding VERY lazily to throttle input... in particular when suddenly/quickly pressing the gas pedal. Maybe it also had some challenges starting when hot, but that was a LONG time ago so I don't remember exactly.


Edited by ewalberg 9/28/2020 5:06 PM
#242047 - in reply to #242044
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Posted 9/28/2020 9:34 PM
4x4abc



Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
5000
RE: G500 no gas pedal response

do we have a throttle body sensor on the G500?
#242049 - in reply to #242047
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Posted 9/29/2020 11:25 AM
ychung
Veteran


Date registered: Aug 2015
Location: SO CAL
Vehicle(s): 2004 G500, 2014 ML350, 2008 S550
Posts: 196
100
RE: G500 no gas pedal response

Isn't the throttle position sensor same as the gas pedal sensor which you've already replaced?
#242050 - in reply to #242040
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Posted 9/29/2020 11:40 AM
AlanMcR
Expert




Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3500
2000
RE: G500 no gas pedal response

Harald has replaced the pedal sensor, which senses the position of your right foot. There is no direct connection to the actual throttle.

The throttle body is a separate device that controls the air intake for the motor.  It is directly controlled and sensed by the ECU.  it could easily be that the throttle is stuck, or has a limited range.  I've never had one in hand, but I'd suggest trying to clean it and free up the mechanism.

#242051 - in reply to #242050
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Posted 9/29/2020 11:54 AM
J.R.
Elite Veteran




Date registered: Apr 2006
Location: Southern Maryland
Vehicle(s): 00 G500, 09 911 4S, 11 Cayenne S, 86 280GE (sold)
Posts: 828
500
RE: G500 no gas pedal response

4x4abc - 9/28/2020 9:34 PM

do we have a throttle body sensor on the G500?


I believe the 2002 does have one: https://www.rockauto.com/en/catalog/mercedes-benz,2002,g500,5.0l+v8,...

Accelerator Position Sensor too. http://www.mercedesmedic.com/mercedes-throttle-possition-sensor-pro... About 1/2 way down is the APS (the part you replaced) reset procedure. Might give it a try.

If that does not resolve it, I would be inclined to measure the voltages and resistances called for in a service manual for those two (TBS and APS) before going much further.

Edited by J.R. 9/29/2020 4:00 PM
#242052 - in reply to #242049
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Posted 9/29/2020 2:17 PM
4x4abc



Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
5000
RE: G500 no gas pedal response

could not find the reset procedure - please help!
#242054 - in reply to #242052
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Posted 9/29/2020 4:00 PM
J.R.
Elite Veteran




Date registered: Apr 2006
Location: Southern Maryland
Vehicle(s): 00 G500, 09 911 4S, 11 Cayenne S, 86 280GE (sold)
Posts: 828
500
RE: G500 no gas pedal response

4x4abc - 9/29/2020 2:17 PM

could not find the reset procedure - please help!


Sorry about that http://www.mercedesmedic.com/mercedes-throttle-possition-sensor-pro...

#242057 - in reply to #242054
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Posted 10/1/2020 9:51 PM
4x4abc



Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
5000
RE: G500 no gas pedal response

so, reset did not work

took the MAF out (tried cleaning first) - will buy new one tomorrow
workshop instructions are NOT very helpful
#242064 - in reply to #242057
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Posted 10/2/2020 4:27 PM
4x4abc



Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
5000
RE: G500 no gas pedal response

MAF sensor in La Paz:
Mercedes Bosch $400 one week wait for order
Bosch $50 not in stock and won't order
Autozone (Chinese replica) $180 10 days wait for order
MercadoLibre (Chinese) $65 2 days on doorstep
Amazon Bosch $145 shipping 2-3 weeks
#242074 - in reply to #242064
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Posted 10/18/2020 4:36 PM
hardtop
New user


Date registered: Apr 2020
Location: Utah, USA
Vehicle(s):
Posts: 4

Re: G500 no gas pedal response

Did you get it fixed? The MAF provides data that the computer uses for air/fuel mixture and not opening/closing the throttle. Investigate the throttle motor on the throttle body to see if it is moving and if the butterfly is opening when the pedal is pressed.
#242109 - in reply to #242040
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Posted 10/19/2020 6:43 PM
4x4abc



Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
5000
Re: G500 no gas pedal response

the part just arrived

will check the throttle body motor before I drop in the new part
#242112 - in reply to #242109
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Posted 10/19/2020 8:59 PM
4x4abc



Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
5000
Re: G500 no gas pedal response

looking for the throttle body motor I found the source of my troubles.
Rodents having my cables for dinner.



(rodents cable.jpg)



Attachments
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Attachments rodents cable.jpg (105KB - 0 downloads)
#242113 - in reply to #242112
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Posted 10/19/2020 10:56 PM
Otiswesty
Administrator




Date registered: Jun 2007
Location: Portland, Oregon
Vehicle(s): 463.241, 461.213
Posts: 3002
2000
Re: G500 no gas pedal response

You need to get some cats again Harald!
#242114 - in reply to #242109
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Posted 10/21/2020 12:25 AM
4x4abc



Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
5000
Re: G500 no gas pedal response

my dogs have eaten (literally) all cats that have come close to the house over the last few years.
#242117 - in reply to #242114
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Posted 10/21/2020 12:27 AM
4x4abc



Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
5000
Re: G500 no gas pedal response

can't get the plug out of the throttle body to repair the wires.
Will have to remove the throttle body tomorrow to get access.
#242118 - in reply to #242117
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