2.0jts FAULT CODES p0120,p1121,p1122 - Alfa Romeo Forum
You are currently unregistered, register for more features.    
 2Likes
  • 1 Post By cra
  • 1 Post By sensingsys
 
Thread Tools
(Post Link) post #1 of 8 Old 21-07-15 Thread Starter
Status: sold
AO Member
 
Afco's Avatar
 
Join Date: Nov 2014
Location: Belgium
County: Oost-Vlaanderen
Posts: 218

Member car:

Spider 2005 jts

2.0jts FAULT CODES p0120,p1121,p1122

Multiscan give this 3 faults, when erased those faults car drives normal for 500 mtrs en than hesitates and less more power. what do i have to do
Afco is offline  
Sponsored Links
Advertisement
 
cra
Status: -
AO Member
 
Join Date: Dec 2010
Location: Norway
County: Hordaland
Posts: 14
Perhaps cleaning connectors in engine bay?
Just what I found, from a quick search here on forum.
Afco likes this.
cra is offline  
Status: -
AO Member
 
Join Date: Mar 2006
Location: United Kingdom
County: Staffordshire
Posts: 759
First thing, find out what the codes mean, googling 'fault codes' gave me a lot of references to OBD, googling 'OBD fault codes' led me to Complete List of OBD Codes: Generic OBD2 (OBDII) & Manufacturer | Car OBD Diagnostics, ECU Chip Tuning & Auto Repair Support. checking your numbers shows that all those codes refer to the throttle position sensor.

Next get the GTV/Spider repair instructions, a link is available on the GTV/Spider forum - do a search there.
sensingsys is offline  
(Post Link) post #4 of 8 Old 31-07-15 Thread Starter
Status: sold
AO Member
 
Afco's Avatar
 
Join Date: Nov 2014
Location: Belgium
County: Oost-Vlaanderen
Posts: 218

Member car:

Spider 2005 jts

Quote:
Originally Posted by sensingsys View Post
First thing, find out what the codes mean, googling 'fault codes' gave me a lot of references to OBD, googling 'OBD fault codes' led me to Complete List of OBD Codes: Generic OBD2 (OBDII) & Manufacturer | Car OBD Diagnostics, ECU Chip Tuning & Auto Repair Support. checking your numbers shows that all those codes refer to the throttle position sensor.

Next get the GTV/Spider repair instructions, a link is available on the GTV/Spider forum - do a search there.
OK, butt what thous this mean and what to do. I have a spare throttle house with the switch on that i mounted and ................exactly the same faults. First i did a reset and after 200 mtr with full throttle open exactly the same faults
Can you give me the link to do the search on the forum because i dont find it

P0120 Throttle Pedal Position Sensor/Switch A Circuit Malfunction
P1121 Throttle Position (TP) Sensor Circuit Intermittent High Voltage
P1122 Throttle Position (TP) Sensor Circuit Intermittent Low Voltage

Last edited by Afco; 31-07-15 at 15:19.
Afco is offline  
Status: -
AO Member
 
Join Date: Mar 2006
Location: United Kingdom
County: Staffordshire
Posts: 759
I have zero experience with throttle problems, but I will try to assist.

There are three parts to the throttle control, the accelerator pedal potentiometer [L49], the ECU and the throttle actuator [S59]. L49 connects directly to the ECU, S59 connects to the ECU via plug/socket G133b.

Electrical drawings for these and a description of their operation are here http://sensingsys.myzen.co.uk/GTV JT...e drawings.pdf
Location of G133b is here it is one of the two plugs http://sensingsys.myzen.co.uk/plugs location.jpg it is one of the two plugs ringed in yellow.

I did a search for P0120 on the alfaowner home page and got 51 results, mostly to do with the JTS engine, I looked at about a dozen but there did not seem to be any definitive fix.

Personally I would suspect the pedal position sensor or its connector as P0120 specifically mentions "Throttle Pedal Position". It is supposed to be very awkward to get to though. A new one costs about £600!
Afco likes this.

Last edited by sensingsys; 01-08-15 at 09:34. Reason: update
sensingsys is offline  
(Post Link) post #6 of 8 Old 03-08-15 Thread Starter
Status: sold
AO Member
 
Afco's Avatar
 
Join Date: Nov 2014
Location: Belgium
County: Oost-Vlaanderen
Posts: 218

Member car:

Spider 2005 jts

Thanks for the assist
I found the connector near the throttle pedal and when disconnecting him i found out there is some grease in it, maybe that s causing the problem so i cleaned it out and reconnected it. For the moment the problem is i cant make a test drive because at this time i have no MOT. Other wise in the same area at the other side of the pedal i found 2 male and 1 female white connectors all of them with 2 wires in, non of them are connected to anything and on first sight have nothing to do with the throttle pedal. The female connector fits in both of them .
Anyone knows if i got to connect them and whats the purpose of them?
Afco is offline  
(Post Link) post #7 of 8 Old 12-08-15 Thread Starter
Status: sold
AO Member
 
Afco's Avatar
 
Join Date: Nov 2014
Location: Belgium
County: Oost-Vlaanderen
Posts: 218

Member car:

Spider 2005 jts

Back again, cleaned all connectors ( 2 = one at the pedal and one at the throttle body ) cleaned the the throttle housing. After 2 starts the same faults are back again. Then placed the old throttle house , exactly the same faults.
Is there a special way to learn in the throttle pedal position on the JTS or is this the same as on a TS?
Afco is offline  
(Post Link) post #8 of 8 Old 18-08-15 Thread Starter
Status: sold
AO Member
 
Afco's Avatar
 
Join Date: Nov 2014
Location: Belgium
County: Oost-Vlaanderen
Posts: 218

Member car:

Spider 2005 jts

After i opened the mechanical/electrical housing of the throtlle body i cleaned the electrical splines in the housing the faults are gone and the car drives better butt not as smoothly as i wish
Afco is offline  
Reply

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Engines (TS, JTS, JTD & V6)

Tags
20jts , codes , fault , p0120 , p1121 , p1122

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome