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Mercedes Benz Sprinter 412D 2.9 1998 - Code P1222, throttle position fault #

Posted by Simon Forsey on August 19, 2010, 9:44 am

Year of Manufacture *: 1998
Engine Size and Code *: 2.9
( Optional) Fault Codes: P0115 CTS P1222 Acceleration Pos Sensor

Hi

This van has the EDC light on and the throttle does not respond.

P0115 Coolant temp sensor [I fixed this, broken wire]
P1222 Acc Pos Sensor

The garage has already replaced this sensor, I have checked the wiring back to the ECU, OK
I have checked the voltage output back to the ECU, OK.

I have checked the lives and earths at the ECU, however, P1222 keeps coming back and the engine wont rev.

Any help would be great.

Regards

Simon

Re: Mercedes Benz Sprinter 412D 2.9 1998 - Code P1222, throttle position fault #

Posted by Kev Gundry <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5245' width='330' height='300' border=0 style='border:none;'> on August 20, 2010, 1:22 pm, in reply to "Mercedes Benz Sprinter 412D 2.9 1998 - Code P1222, throttle position fault #"
Kevin Gundry

Hi Simon, check the connector that is located in a plastic bag normally cable tied to the battery tray, this is the one that connects to the fuel pump and gives the smptoms you describe

Hth

Kev gundry

Re: Mercedes Benz Sprinter 412D 2.9 1998 - Code P1222, throttle position fault #

Posted by Tony Sefton <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5581' width='330' height='300' border=0 style='border:none;'> on August 21, 2010, 12:06 pm, in reply to "Mercedes Benz Sprinter 412D 2.9 1998 - Code P1222, throttle position fault #"
Tony Sefton

Hi Simon. We have just had something similar, ( can't remember the model though )

Ours was caused by an Idle switch on a bracket on the bulhead that wasn't working, (where the throttle cable connects to )

The Bracket and cables were all rusty and siezed up, a squirt of WD40 and a good workabout sorted it out.

H.T.H Tony.

Re: Mercedes Benz Sprinter 412D 2.9 1998 - Code P1222, throttle position fault #

Posted by Simon Forsey <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5231' width='330' height='300' border=0 style='border:none;'> on August 21, 2010, 1:25 pm, in reply to "Re: Mercedes Benz Sprinter 412D 2.9 1998 - Code P1222, throttle position fault #"

Hi Guys

Thanks for ther advice.

A new sensor has been fitted by the garage.

I have already checked the connector in the 'bag' all is well there.

Simon

Re: Mercedes Benz Sprinter 412D 2.9 1998 - Code P1222, throttle position fault #

Posted by Tony Sefton <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5581' width='330' height='300' border=0 style='border:none;'> on August 23, 2010, 8:55 am, in reply to "Re: Mercedes Benz Sprinter 412D 2.9 1998 - Code P1222, throttle position fault #"
Tony Sefton

Hi Simon. You say "A New sensor" has been fitted, ours was nothing to do with the Throttle position sensor.

sorry if i am repeating what i said,

but the Code "Throttle posion fault" made me think of throttle position sensor, after following the test procedure and information, I Realised that ours had an Idle switch as well as the throttle position sensor.

The idle switch fault caused the ecu to log the code " Throttle position fault" as it would not know which one to believe.

I suppose it could also be a wiring fault to the idle switch,

Sorry if my post is misleading or annoying but it does sound very similar to the one that we had.

Tony.

Re: Mercedes Benz Sprinter 412D 2.9 1998 - Code P1222, throttle position fault #

Posted by Simon Forsey <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5231' width='330' height='300' border=0 style='border:none;'> on August 23, 2010, 8:45 pm, in reply to "Re: Mercedes Benz Sprinter 412D 2.9 1998 - Code P1222, throttle position fault #"

Hi

Yes it does have a new TPS, in the wiring it shows a throttle switch is also in the TPS, however,this one has two variable voltages instead of a switch. I checked the old sensor and that is the same, variable voltages on two circuits.

The garage did quiry the part and another was sent out. But that was the same.

Now I am not sure that the variable voltages are correct, however, with the old switch being the same, I cant see it being incorrect.

Regards

Simon

Re: Mercedes Benz Sprinter 412D 2.9 1998 - Code P1222, throttle position fault #

Posted by Tony Sefton <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5581' width='330' height='300' border=0 style='border:none;'> on August 23, 2010, 10:34 pm, in reply to "Re: Mercedes Benz Sprinter 412D 2.9 1998 - Code P1222, throttle position fault #"
Tony Sefton

Hi Simon. From memory, The Idle switch on ours was seperate from the sensor and looked like a micro switch with a lever on it.

It took me quite a while to work out that it had this seperate idle switch and I only found it by reading the WIS information.

Tony.

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